Ls3 Idle Timing
This, however, is not perfect or optimum for any one combination. If a VCM Enhancement has support for RTT, it will display as follows:. 2004 Pontiac GTO Wiring Harness Info - Wiring harness info specific to the 2004 GTO LS1. Exclusive Content Vacuum advance is intended to advance the ignition timing at idle since the engine needs more spark advance at idle in. Dan Ferrell writes about do-it-yourself car maintenance and repair. Be careful of adding to much timing - it can give a great no load idle, but with any kind of load will become erratic. Check for codes and make any required repairs if the MIL. What's Your Idle Speed? This is a discussion on What's Your Idle Speed? within the General Help forums, part of the LSx Technical Help Section category; When I last had my car serviced, the shop owner took it for a drive and noted that my car. I don't know if your Predator will let you adjust idle timing, but HPt will, and if you use the scanner/realtime editor you can run the timing up and down until it sounds the way you like, then go over to the editor and change it to the value you found. Looking a bit further at the timing points, the first one we see on the diagram is the exhaust opening point. Possible Causes: Incorrect camshaft timing. The Causes of Internal Engine Knock, and How to Eliminate it. I got tired of it and told him to turn that crap off tho. Check engine light indicated mass air flow sensor. For an owner or tuner that has never tuned an E85 vehicle it can be a frustrating experience. Idle Speed Warm = The idle speed of the engine when it's fully warmed up. com Monday - Thursday: 8 a. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. For LS3 vehicles, you can either go back in with a single-bolt camshaft or convert to the three-bolt camshaft design that the 1997-2006 LS-based vehicles use. create a correct curve. With 200,000mi, the guides for the timing chain could well be worn and allowing it to make more noise. Irregular idle speed. These features are in addition to the existing 12V activated timing retard, programmable step retard, launch retard and RPM rev-limiters from its predecessor. 00" bore or larger 2. LS3 engines are also being used in the new 2010 Camaro. 2-liter, V-8 mill that comes in two flavors in the SS. Find Trick Flow® Timing Chain Dampeners TFS-K30675600 and get Free Shipping on Orders Over $99 at Summit Racing! Trick Flow® timing chain dampeners provide a small amount of tension on the timing chain to keep it from "whipping" on gear changes. While ignition retard systems can be helpful in certain situations, they can also greatly reduce the horsepower output of an engine, as any reduction in timing will reduce horsepower. timing at -20* at idle After doing that I decided to look at real time data to see if I could see anything out of the ordinary. LS3 produces 426hp/408lb-ft tq compared to L99’s 400hp/395lb-ft tq, although the L99 features lower compression. How much timing do these motors like at WOT for an all motor tune? I'm used to running around 30 degrees at WOT in my 4. The LS3 is a Gen. Engine oil is fed to the phaser through a computer-controlled solenoid into the control chambers. Going into a LS3 crate in my VT Im pulling my hair out deciding which cam specs to go with as my workshop have left the deciding to me, they havent cammed a LS3 yet. The LSX Dr also recommends upgrading to an IWIS timing chain, available from Scoggin Dickey #SD3SR602. Post your tune or email it to me. Use 3500+ stall. It can advance valve timing for a smooth idle and low-end torque. GM > Engine > Airflow > Dynamic Airflow. According to the automotive diagnostic website AA1 Car, bad ignition timing is due to an erratic signal from the camshaft sensor caused by harmonic balancer's inability to stabilize the component. The "shade tree" method is to use a timing light, and read the color of the spark plugs and inside of the exhaust pipe. Setting the timing on your engine is one of the most misunderstood adjustments, the information on these pages will help you understand and answer all of your questions about ignition timing. 0 Truck Engines and LS2/LS3 - EV6 Injector Harness , 3. LS1 LT1 LT4 LS2 LS3 LS7 ValveTrain Components LSX GM Chevy Camaro Corvette Silverado Trans Am Firebird SS Z28 ZL1 Fbody C4 C5 C6 5th 6th Gen ZR1 Z06 LS LS1 LS2 LS3. Replaced air filter and maf sensor. 0L engines and still idle well. Also to note, idle timing in the LS1 vintage could settle in at 25-30 degrees while the subsequent LS2/LS3/LS7 head setups (require less timing) will command only about 13-22 degrees. 2013 Corvette Grand Sport A6 Forged LME 416, Greg Good ported TFS 255 LS3 heads, EPS 222/242. If the idle becomes unstable, try raising the idle timing advance if necessary. Manual transmission only. The data is used to calculate air density and determine the engine's air mass flow rate, which in turn determines the required fuel metering for optimum combustion (see stoichiometry) and influence the advance or retard of ignition timing. Classic Industries offers a wide selection of 1979 Pontiac Firebird parts, including 1979 Pontiac Firebird interior parts and soft trim, 1979 Pontiac Firebird exterior sheet metal, 1979 Pontiac Firebird moldings, 1979 Pontiac Firebird emblems, 1979 Pontiac Firebird weatherstrip and unique accessories, to nearly every nut and bolt needed for installation. MBT Reference Chart. Looking a bit further at the timing points, the first one we see on the diagram is the exhaust opening point. A computer is adjusting the idle speed, based on complex calculations. Front: short/long arm ( SLA) double wishbone, cast aluminum upper & lower control arms, transverse-mounted composite leaf spring, monotube shock absorber. 525” max lift on both the intake and exhaust side, and the duration is 219/228 degrees at. Others having trouble with tuning may have created their own issues as I know GM did not "knock up" a Calibration in five minutes for this or any other engine. the engine extracts more power from each molecule of gasoline. Chronicles of idle tuning LS1/big cam He hired my services to tune the engine and so far we've got VE and spark tables fairly dialed in. The timing can change quickly as opposed to a mechanical IAC. MSD 7531 Digital 7-Plus Programmable MSD Ignition Boxes and Coils << Back E-Mail A Friend. Edelbrock’s 416 LS3 crate engine carries a two-year/unlimited mile warranty, so you can drop this baby in and hit the road. LS Ignition Products / LS Coils. For LS3 vehicles, you can either go back in with a single-bolt camshaft or convert to the three-bolt camshaft design that the 1997-2006 LS-based vehicles use. 's parts are designed, intended, advertised and sold exclusively for installation on vehicles in compliance with state and federal law. It all has to do with cylinder pressure. This is because its function is to sense vibrations caused by engine knock or detonation. 1-225-926-6110 info@cammotion. Pushing flow and power even higher. Gen III - Speed Density VE Table and MAF Tuning Instructions with a Wideband O2 Sensor Create by 69lt1bird - Jeff Anderson 2 system is operating rich, long term fuel trim will compensate for the rich condition by decreasing. To replace the timing chain is not a simple job at the front of the engine. The bumpstick installed in this engine features a. The idle and off-idle systems are the hardest part of the fuel system to get the fuel curve correct with a blow-through supercharger system, extreme care must be taken to properly size the idle fuel and air restrictions in order to obtain the correct idle and part throttle fuel mixtures. Ideally you should just have the MS control everything. The 103mm throttle bodies are precision machined from 6061. A 'divorced' exhaust crossover port heated well-choke thermostat coil was used to provide cleaner and faster engine warm-up. programmed setting (see the A/F Target and Timing. I got tired of it and told him to turn that crap off tho. This week I show you how to use HP Tuners to find what timing your engine wants at idle, how to adjust your timing at idle, and how to adjust the base idle airflow to get your engine to idle well. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. Check out part 2 of our LS3 crate motor build. Later, we add some timing in the idle and drivability areas to improve the burn of the mixture, improve fuel economy, lower exhaust temperatures, etc. OP has AI LS3 heads so an obvious difference than mine. Idle Speed Controller (ISC-088) Share: Facebook; Twitter; Pinterest; Google+; $215. MSD 7531 digital 7-plus programmable. The LSX Dr also recommends upgrading to an IWIS timing chain, available from Scoggin Dickey #SD3SR602. Shop Camshaft and Valvetrain parts and get Free Shipping on orders over $99 at Speedway Motors, the Racing and Rodding Specialists. I am able to start the car, but it has a slow hunt up/down at idle. For any other length requirement, simply contact us after submitting your order and we will build the harness to your length requirement. To replace the timing chain is not a simple job at the front of the engine. My configuration: SBF 306 (8. 0L LQ9 engine equipped with LS3 cylinder heads and either EFI or a 950 cfm. A faulty camshaft sensor results in numerous problems with a car, including an illuminated check engine light, a poorly running engine and difficulty or failure to start. MECHANICAL ROLLER: Rough idle, needs high compression, maximum street effort. Valve timing events. LSX Performance Parts. All of the following kits include in house QC inspection of every camshaft to ensure your individual cam will simply install "straight up. Nitro Racing Ignition Timing. Remember this; a correctly timed engine produces the most horsepower. Which allows the startup to have some timing in it to get things going smoothly. We're trying to get some serious power out of this motor using upgrades such as a new Comp cam, GMPP CNC-ported cylinder heads, and more! Only at www. If a Power Adder system is used with timing control, the spark advance can be retarded when nitrous is used. bTR LS3 Stage III 3 Bolt Cam 229 244 615 595 113+4 Texas Speed Stage 3 LS3 231 236 640 615 2200+ great larger duration camshaft for power applications from 2200rpm+. An engine with timing too late (retarded) will have a low idle vacuum, have slow throttle response, feel like a turd at low RPMs and will run hotter than normal. Expect big mid to upper end power, will have a noticeable idle. On specific note, if I put a CAI on my c6 everyone states that it might run rough until I get a tune, but will the computer relearn things like IDLE optimization and such or will it run like crap until I get a tune not realizing any HP or Torque gains without a tune and or relearn process. The timing will probably increase a bunch. Holley LS2/LS3/LS7 90mm Cable Driven Throttle Body Black LS2/LS3/LS7, BILLET 90mm LS Throttle Body w/low RPM Taper. A street/strip car that runs on pump gas may "ping" with this much. It has a peak in the middle of it which is a problem and also low timing advance at low rpm and also at high rpm. The idle stability has become better with use as the LTM has learned the idle protocol and now sits at 820 rpm no problem,. Showcasing our broad group of 227 Bushing available now online. A lack of oil pressure means tensioners cannot immediately tighten the timing chains on startup. 0 CL This camshaft is a great supercharger camshaft for the ZL1 or CTS-V customer looking for an aggressive muscle car sound. FREE SHIPPING FOR PREDATOR 2, INTUNE 3, AND TRINITY 2. searchResultsCount }}. You can keep sneaking the idle timing advance forward while monitoring the above parameters to see where you reach a point of diminishing returns. Vacuum leaks are another common source of timing and fuel mixture problems. The stock spring loaded timing chain tensioner was discarded and upgraded with the stationary “wedge type”. Upgrading to Gen III LS-Series PCM: Sensors and Inputs Guide includes instructional photos, checklists, and step-by-step instructions on upgrading to the GM Gen III LS-Series PCM, ECM, Electronics, and POWERTRAIN CONTROL SYSTEMS. Enabling it will cause idle timing to be dynamic and it may appear to jump around at idle when using a timing light. ferro-spiral core spark plug wire set & Spark Plugs for GM gen 4 LS3/LS4/LS7 engines. Chevrolet Camaro Stalling or Low Engine Idle Speed Due to Dirty Throttle Body - 13 reports. timing at -20* at idle After doing that I decided to look at real time data to see if I could see anything out of the ordinary. Does the Ignition Timing jump from each setting, or is there interpolation? Does the Ignition Timing Control learn what's optimum for my engine? Do I need to use the Ignition Timing Control if my system has it? What advantages does Ignition Timing Control have? Where is the best place to mount it?. We test GM's new variable valve timing system and get dozens of horsepower with not sacrificing and torque. 2L small block engine used in GM performance cars between 2009 and 2017. The symptoms are very indicative of retarded timing. Learn about this problem, why it occurs, and how to fix it. a dealer was not contacted. Aftermarket roller-cam, GM roller lifters. Kodiak engines are custom calibrated for jetpump and out drive boats. The stock spring loaded timing chain tensioner was discarded and upgraded with the stationary “wedge type”. sparks at idle rpm plus increased. Big Block V8 - 385 Series (6. • Fits factory timing cover • NOTE: This high volume oil pump is thicker than the production LS1, LS6, LS2 and LS3 oil pump and may not fit in a stock timing cover with aftermarket double roller timing chains that require spacing out the oil pump. Right now I am seeing around 23-26 degrees at WOT in my LS2 depending on IAT temps. This is often caused by overadvanced ignition timing, poor engine cooling system efficiency (scale, stoppages, low level), a very lean A/F mixture, a leaking intake manifold, or the use of a spark plug too hot for the application. Many of Power Automedia’s online magazines are covering the assembly of this custom 427ci LS3 that will be given away by warehouse distributor Motovicity and built by Duttweiler Performance, a highly-respected engine shop in Ventura, California. This is usually just a normal oxygen sensor that is a little more linear in its behaviour away from the 14. PERIOD Use a dead stop and bring the motor to TDC #1 and then compare you timing marks, I am sure you will find something amiss. Rotate the injection pump to increase or decrease engine timing as needed. Engine is not stock, it is a GMPP LS3/525 crate motor. I got tired of it and told him to turn that crap off tho. RepairShellService. Using a brand new LS3 crate engine, we started from scratch to build the most powerful LS3 camshafts available in the country. EDELBROCK 28215 SUPER VICTOR LS INTAKE MANIFOLD CHEVY LS3, EDL28215 Engine Block Style:Stock/OEM standard deck Injection Style:Multi-port Basic Operating RPM Range:3,500-7,500 Intake Section Included:Complete EGR:No Injectors Included:No Fuel Rails. Point the timing light down at the timing tab on the timing cover. This, however, is not perfect or optimum for any one combination. Stock rocker arm ratios vary between manufacturers and engine types, but generally all small block Chevy's come with a 1. **The factory LS3 camshaft uses a single-bolt cam design, which means one bolt holds the upper timing sprocket on the camshaft. Both should be a light tan color. Must idle at 950 rpm or preferably less but for the sake of timing. 600 lift as a mild-ish NA cam. We have all noticed the different sounds of performance cams, with the distinct lopes or rough idle. 2L V8 Vehicle Fitment: Calais VZ VE VF, Caprice WL WM WN, Commodore VZ VE VF, Crewman VZ, Statesman WL WM For further details, please refer to the vehicle fitment guide in the above image. Understanding the effects of valve events or valve timing is the real secret to understanding engine performance. Check engine light indicated mass air flow sensor. I'm near 100% positive a GOOD tune will fix your issue. A centrifugal blower won't fix the. 1-225-926-6110 info@cammotion. Variable Valve Timing (VVT) is a way to advance/retard valve timing, and change duration, overlap and even lift in some applications while the engine is running. Rough idle. Computer controlled engines with a. NxtGen Billet Valley Cover; Nxtgen Billet Timing Cover $ 22,900. E38 Gen IV Corvette - EFI Tuning Class 3 E38 Gen IV ECM Class - Curt Miller begin the scan. Idle The PCM has a number of parameters that influence the idle behavior of the engine. Nitro Racing Ignition Timing. Higher then 25 degrees net a small hp increase and have seen reduction in torque numbers. 5:1 ratio rocker arm. Decrease in fuel economy. GM Performance Parts for the lowest prices on the web. Support Articles » Technical Articles » Other Tech Articles » How To Check and Set Up Base Ignition Timing How To Check and Set Up Base Ignition Timing This step occurs after ensuring that your base ignition settings are correct and the car starts, but before actually taking the car for a drive or presenting load to the motor. Looks like your idle speed is really low, to begin with. Chevrolet Camaro Stalling or Low Engine Idle Speed Due to Dirty Throttle Body - 13 reports. The Install Gasket Kit Includes: Front Timing Cover Gasket, Timing Cover Damper Seal, Water Pump Gaskets and Dampner Bolt. 2L small block engine used in GM performance cars between 2009 and 2017. Upgrading to Gen III LS-Series PCM: Sensors and Inputs Guide includes instructional photos, checklists, and step-by-step instructions on upgrading to the GM Gen III LS-Series PCM, ECM, Electronics, and POWERTRAIN CONTROL SYSTEMS. Luckily, we had the perfect pair of test mules on hand. It sounds somewhat like timing chain rattle. **The factory LS3 camshaft uses a single-bolt cam design, which means one bolt holds the upper timing sprocket on the camshaft. So far I had been. 【純正品】XEROX CT201398トナー BK 商品スペック【適合機種】 DocuPrint C3350【印字枚数(約)】5,000枚 送料·配送についての注意事項 本商品の出荷目安は【1 - 5営業日 ※土日·祝除く】となります。. When using a 3-bolt core camshaft you will need a new camshaft sprocket. 2007+ requires dropping the oil pan to swap these, 2006 and down can be done without, but not fun. 2004 Pontiac GTO Wiring Harness Info - Wiring harness info specific to the 2004 GTO LS1. The ID1300 is a direct fit in GM LS3-LS7-L76-L92-L99-LSA motors, and is the first high flow injector supplied with accurate characterization files for an OEM quality tune. This is an example of 600rwhp on pump gas like I said its a bit extreme. These features are in addition to the existing 12V activated timing retard, programmable step retard, launch retard and RPM rev-limiters from its predecessor. Lingenfelter has produced some of the best street camshaft profiles available for the LS1, LS2, LS3, LS6 engines. LS3/LS7/L76/L92/L99 2009+ Cadillac CTS-V LSA Camaro 10+ (LS3) Camaro ZL1 (LSA) C6 Corvette C6 Z06 (LS7) C6 ZR1 (LS9) The ID1300 is an all new injector, designed in partnership with Bosch Motorsport. Gas mileage was also down a bit and idle was a bit rough. for quick transitions from high rpm to idle conditions. One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. USUAL CAUSE The usual cause of abnormally high idle speeds are vacuum leaks or an inoperative idle speed control motor. MBT Reference Chart. Idle is not an mbt area. This goes. Step 6 - Observe and Assess. Black indicates a too rich condition, and white indicates a too lean condition. They are junk, the coil dwell curve isn't the same as most of the others. If the ignition timing is off, that is likely the source of the pre-ignition. Most stock street engines call for 6 to 8 degrees of initial. Buy and sell almost anything on Gumtree classifieds. Purchase the LS3 naturally aspirated verison of the Bald Eagle camshaft made famous by Cleetus McFarland and "Leroy", his savage C5 Corvette! The naturally aspirated version of the Bald Eagle camshaft is a great choice for engines running LS3 rectangular port heads and not running a supercharger. View Single Post post #3 of Old 04-21-2014, 06:08 PM. How do cams affect compression? This is a good one with no single answer. Ignition modifiers are set to 0 and the software is saying the actual timing is 30°-31° at idle. It features a clean, mesh wrapping that dramatically improves engine aesthetics over the factory harness. FAST GM LS1 Idle Air Control (IAC) Valve 307059. Camshaft and Valvetrain parts in-stock with same-day shipping. What we have done is add the RTT on top of our existing VCM Enhancements. Chevrolet Performance LS3 Assembled Head (L92 / L76 & LS3 FITS ANY LS SERIES ENGINE BLOCK WITH 4. 7 rocker 115. Raise the engine's rpm to a fast idle. In June 2014 I took the Van (with 650 miles on the odometer) back to Rinke to complain. Presenting available for purchasing now online!. Shop Camshaft and Valvetrain parts and get Free Shipping on orders over $99 at Speedway Motors, the Racing and Rodding Specialists. 30 upper pulley upgrade Metco 100mm idler belt slip, best lowest sale price at WEAPON-X Motorsports. So for example, if you MBT out at 35 degrees at 3k rpm, then for maximum efficieny y. com is to show you just how great of a fuel ethanol can be. 78024 78025 I'm having trouble getting the idle to settle down on this project. Under other conditions, the phaser adjusts to deliver optimal valve timing for performance, drivability and fuel economy. Ignition timing is a tuning tool for professional Top Fuel drag race engine builders. On specific note, if I put a CAI on my c6 everyone states that it might run rough until I get a tune, but will the computer relearn things like IDLE optimization and such or will it run like crap until I get a tune not realizing any HP or Torque gains without a tune and or relearn process. FID 1300 INJECTOR, LS3/LS7/L76/L92/L99, LS2, CAMARO 10+ (LS3), C6 VETTE, C6 Z06 (LS7) The FID 1300 is a Bosch based Ev14 based High Impedance fuel injector, utilizing the latest in fuel injector technology. It's a little better on. There are lots of MoPar's, Chevy's and Ford's that one can listen to and compare; not so much with Avanti's. ) after bottom dead center and alter the intake valve opening point to set the idle quality. The Gen-4 engines feature rectangular intake ports and increased 2. The spark plug has to fire at exactly that moment in order to give the best engine performance. large duration camshaft over 80 peak hp gains with a radical idle some bucking bellow 1500 rpm. Doing it his way, you get the valve cover gaskets changed, the timing belt replaced as maintenance and when replacing the timing belt its a good idea to replace the water pump (the timing belt drives the pump) and there are timing cover seals inside that should also be replaced at that time. 2L LS3 Engine is what do you get when you take Chevrolet's aggressive ASA camshaft, developed for the high-RPM world of circle track and slip it into an LS3 6. Timing was at 22°. And, it is all done automatically! VVT becomes an issue when swapping a cam: Piston to Valve Clearance can be a problem. im still just trying to picture it in my head how the timing is pulled out in boost if the initial timing is lower than boost. find the timing of my engine? The timing of the transfer and exhaust ports is a key factor controlling the performance characteristics of a two stroke engine. Higher then 25 degrees net a small hp increase and have seen reduction in torque numbers. they usually dont need much timing, at least comparatively to LS1's. VVT is computer-controlled and typically uses oil pressure to change the position of a phaser mechanism on the end of the camshaft to advance or retard cam timing. Then if the TPS is below 6%, it removes timing from the base value. The timing will probably increase a bunch. settings above). Camshaft and Valvetrain parts in-stock with same-day shipping. NxtGen Billet Valley Cover; Nxtgen Billet Timing Cover $ 22,900. How much timing do these motors like at WOT for an all motor tune? I'm used to running around 30 degrees at WOT in my 4. It's normal to not run mbt timing at idle. The IAC is a pcm controlled stepper motor location the throttle body, just above the TP sensor. Codes p0300, p0302, p0303. Computer controlled engines with a. For LS3 vehicles, you can either go back in with a single-bolt camshaft or convert to the three-bolt camshaft design that the 1997-2006 LS-based vehicles use. Free shipping. 3s developed a valve train noise at idle even though a manual pressure gauge shows hot oil pressure @ 20psi. Camaro Tuneup Specifications - factory stock ignition carb settings. just use the live controls to figure out a nice steady idle, and note at what spark that was, set the idle spark tables to that value at the proper map/rpm. 12629063 LS3 Cylinder Head Assembly Features: Aluminum performance head Fits any LS family engine with 4. Comp Cams 146-456-11 Single Bolt Camshaft for GM GEN IV LS LS3 6. With superior performance, durabiltiy and overall customer satisfaction, it's no wonder we can say, “On Open Water, They’re Priceless. It truly is a "hot cam" that offers up an aggressive lope at idle and a buzz saw power band that never stops. Variable Valve Timing (VVT) is a way to advance/retard valve timing, and change duration, overlap and even lift in some applications while the engine is running. 050” lift with a 112 degree lobe separation angle. LS2's are quite different about idle control. The only difference between a timing belt and a chain is that belts are made out of rubber, while timing chains are metal chains. 7:1), Kenne Bell (11psi), and water-to-air intercooler. The new 58X crankshaft ring and sensor. Nitro Racing Ignition Timing. Higher then 25 degrees net a small hp increase and have seen reduction in torque numbers. The engine will idle and cruise just like an LS3, but the power increase is there whenever you need it. Valve timing events. LSX TEXAS SPEED CAM TSP's all new line of LS3 camshafts are the result of our latest round of engine dyno camshaft development using our state-of-the-art Superflow 902 engine dyno. Dyno results and idle clip videos are for example only. TITLE LS3 Crate Engine Asm. timing at -20* at idle After doing that I decided to look at real time data to see if I could see anything out of the ordinary. The stock spring loaded timing chain tensioner was discarded and upgraded with the stationary “wedge type”. If the idle becomes unstable, try raising the idle timing advance if necessary. Words And Photos: Richard Holdener Ignition timing is a critical element in any internal combustion engine. DeatschWerks Injectors are 100% drop in fitting with E85 Compatabiliy. LSX Performance Parts. A timing mark is an indicator used for setting the timing of the ignition system of an engine, typically found on the crankshaft pulley (as pictured) or the flywheel, being the largest radius rotating at crankshaft speed and therefore the place where marks at one degree intervals will be farthest apart. A well honored starting table, as contributed by a fellow HP Tuner Forum member is: Valve overlap Idle RPM