You can use this data in the same way as in tuning part-throttle. If so, then your changes were good. If this is the first time you're reading your PCM, keep this presumably stock file somewhere safe! Choose your year and vehicle, entire your tire size or diameter, and it will calculate the speed at which your car will be moving at a specific RPM in each gear. The PCM has a table for adjusting where each cell of the fueling map begins and ends. Data from the car should begin to be shown in the main window. It is important to point out that tuning your own vehicle is a complex process, and if you are not comfortable with it you should seek out an expert to help you. Once you read your memcal, I build your new tune to your specs and email it to you, at which point you then burn it onto the blank chip I send. The car only passed after I tuned it to near 0% LTFT?s.

12.8:1 is the preferred air-fuel number to shoot for on the dyno. If your car has been running rich for awhile (low MPG, excessive black soot under rear bumper), chances are the O2 sensors will need either cleaned or replaced. You will need to scan/log the car to be sure you haven't gone too far, or not far enough, as it's not completely linear: trial and error is needed! At the same time, you don't want the IAC counts ever to hit 0, which can happen with a hot engine when the blades are open too far (or the TB's idle bleed hole is too big). 14.7:1 is important because that is what is called the stoichiometric ratio for air and gasoline. Depending on engine setup, sometimes these values need to be lowered by as much as 20-30 points (as with large valve overlap cams in the lower RPM/load sections). I am willing to ship around the world, so even if you live overseas, we can still get it done!

There is no VIN or individual PCM restriction with TunerCat, so you can tune multiple cars and/or PCMs without having to pay any additional fees. The best way to achieve optimum driveability at part throttle and to ensure emissions compliance is to tune for 0% fuel trims. Some say they aren't at all; some say they are only when the car is just started (and the MAF sensor is not warmed up); some say they are used to fine-tune the AFR when the BLMs are slightly off; some say they are used at WOT. New/clean O2 sensors can make a huge difference in how well the PCM works (the PCM will read richer than it is when the O2 sensors are fouled). All rights reserved.

92-95 LT1 & 87-92 F-Body/Corvette TBI/TPI: Run some engine cleaner through your fuel tank, throttle body and intake manifold (brake booster hose is a good entry for that). Below is a partial list of the various systems and their checks that I can enable/disable for you. Bosch injectors are commonly used in LT1s, and most of them have substantially longer offsets than the stock Rochester LT1 injectors. If you decide you like the idea of tuning on your own, visit TunerCat and purchase the C.A.T.S. When tuning an LT1 PCM, one of the first things to do is remove things that you dislike or physically removed.

For increasing pressure at WOT, especially when upgrading your transmission, you must first increase the Max. Fuel pressure flow; the fuel injector constant is also affected if you run a fuel pressure different than the stock 43.5psi. 1.01), and cooler cylinders should be lessened (ex.

Now you should log the car, while driving with all ranges of acceleration, from 800RPM up to around 2000RPM. Only a dyno can tell you for sure. For the average computer user and car enthusiast, there isn't much to it! If it senses the combustion is too rich (too much fuel), it will remove fuel and the number will decrease (< 128).

Check the link above for details and pricing! By increasing the values in this table, less fuel will be used before closed loop (O2 sensor feedback) is entered. For 96+ LT1/LS1 PCMs, you must purchase another program originally made by TunerCat and now sold by JET, the Dynamic Spectrum Tuner (DST), which is much more expensive ($300+) and is locked to a limited number of VINs (Amazon usually has the best price). There are at least two main ways to affect MPG: fueling and timing. Be absolutely certain nothing interrupts this process once it has started or you will damage the flash chip in the PCM, and a new one will need socketed or soldered in before you can use the PCM again (the car will also not run). It requires you to have a laptop with Windows 7+ and have or purchase your own tuning kit (ALDL cable/converter box, chip burner and chip for chip-based ECMs, tuning software, and datalogging software), in order to let me tune for you through email. Flashhack will have stored the "fingerprint" of your PCM so that any future flashes will be done compared against the previous tune that was flashed (to save on flashing time). As the piston travels back up the cylinder, the spark plug is fired and the air:fuel mixture is ignited. If a car was equipped with a wide band O2 during closed loop operation, you could see the air/fuel ratio swapping back and forth between 14.4:1 to 15:1 as the PCM adjusts back and forth constantly. What setups need or benefit from Power Tuning? ALDL vehicle port - all factory vehicles which I can tune come with these; it is necessary to data-log the vehicle while driving, as well as to load the tunes for 1994-2005 flash-based LT1/LS1/Vortec PCMs. Thus the term "open loop.". The optimum RPM ranges for max efficiency will change because of that, and the PCM can sometimes run out of room to adjust. The adjustments from the PCM are not just thrown away however. Timing makes a large difference in combustion efficiency. Setting the Kickdown MPH table much lower than you need and then using the Kickdown RPM table to set the actual RPM where you want the shift to start will usually give the best results. Running rich, if it happens long enough, can also foul the O2 sensors, which will put you in a never-ending cycle, as the fouled sensors read less oxygen and think more fuel is needed for efficient combustion.



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