The process will begin and you'll see its progress on the left. By now you should have a good understanding of how the PCM governs fueling for your engine. Then, find the closest value(s) in the MAF sensor tables; you will sometimes have to alter two cells to affect one airflow range. In OBDII, the system is percent based in terms of read out. This allows me to keep each person's name and mailing information separate from their PCM info, in case they ever send another PCM or have the same one retuned in the future. The adjustments from the PCM are not just thrown away however. Then multiply that number by your fuel injector's rating. Connect your ALDL cable to the ALDL port in your vehicle and in to your laptop; make sure both ends are securely attached. You will need an adapter from Moates to easily install the new chips (G1 for TPI/LT1, G2 for TBI). There may be times when your total timing will be 0°, if you set this value high enough and your "Closed TPS Timing" values low enough. This is the most common way for me to tune your PCM. In open loop, the PCM takes the reading from the Mass Airflow Sensor (referred to as MAF or sometimes MAS), the Manifold Absolute Pressure sensor (MAP) and an RPM reading. (Optional) If you have a wideband O2 sensor setup, you may connect it to your LT1 vehicle in one of two places and have the WB's AFR reading show up in EEHack logging (very useful). The answer is not so simple.

First, be sure that the "1994 Camaro Z28" is chosen for the vehicle type; this will work with both 1994 and 1995 LT1/L99s PCMs.

Too little timing advance tends to kill MPG and power, giving a lazy feeling to throttle response. When at this ideal, the BLM will read 128, or no correction. For '86+ TBI (1228063), you will need a socket that must be soldered directly onto your stock PCM. Now that you've done a good amount tuning, you are ready to take the car to a dyno for more intensive power increase. The PCM can make permanent adjustments to overcome changes in fuel or airflow caused by engine modifications?.until the battery cable is removed. This means that if your VE tables or MAF sensor are calibrated wrongly at those ranges, there is nothing the PCM can do. Turn your ignition to ON, engine OFF, go to the main EEHack window and click "Connect" at the top. Many people are familiar with this table from using Bosch/Ford SVO injectors, which have a longer offset than the stock AC/Delco injectors. Did you recently do some of the mods below? When modifying the engine, especially with cams with more valve overlap, increased displacement, or ported heads, these will need to be adjusted accordingly. BE ABSOLUTELY CERTAIN THAT YOU WILL NOT LOSE POWER TO YOUR LAPTOP OR YOUR VEHICLE'S BATTERY, AND THAT NOTHING ELSE WILL INTERRUPT THE FOLLOWING PROCESS LIKE THE LAPTOP RESTARTING OR GOING INTO STANDBY OR HIBERNATE MODE. The new mode is called PE, or Power Enrichment. This table alters how each cylinder is fine-tuned based off the calculated fueling needs for each bank. Both will use less fuel, which will improve MPG.

At least one person I don't personally know has tested this method on a dyno, and I have also tested it successfully with one of my customers, so the logic is confirmed by real-world results; this gives you one more way to reach the exact tune that you desire.

This saves you down-time since you do not need to send me your 1994+ PCM, and allows the tune to more accurately match your specific setup. Many people have warned against increasing line pressure via the PCM when you have also installed a "shift kit." 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. For those ordering via postal mail, I offer one free retune if you pay for shipping both ways. If you want the TCC to stay locked when you lightly accelerate, then uncheck the switch for "TCC Unlock at Low TPS" and it should remain locked until it hits the TPS/MPH values you have set in the tables, even with light throttle increases. Then, compare your true AFR (from the WB) to what the PCM is targeting (%Change to AFR at WOT tables). Once an appropriate operating temperature is reached, the PCM then brings the O2 sensors on line and uses them for It has been shown through practice that a leaner fuel mixture increases combustion temperature, and therefore a richer mixture decreases temperature. As a consistent trend in O2 sensor feedback forms while driving, the PCM will set a "permanent" modifier to accomodate the initial PCM tune being wrong; this is called the long-term modifier. Once you change your tables accordingly, and have gotten as close to a long-term BLM of 128 as you can, reenable PE mode by putting the constant for MAP value to enable WOT back to the former value (15 is stock). Independent studies of internal combustion engines have shown that the most cylinder pressure (i.e., power) is generated with AFRs of 0.9 to 1 x lambda (varying with engine type/makeup, etc.). OBDI Tuner (beta version of TunerCat, available by request from them once registered) or the standalone WinFlash to read and write to your '94-'95 LT1/L99 vehicle's PCM. You want all different amounts of load on the car at the different RPM ranges to get the best data possible. It will cause the engine to hit the rev limiter, and once you let off the throttle, it will upshift. For 1986-1993 TBI/TPI/LT1 chip-based PCMs, I send you a chip burner/eraser, a blank chip, a memcal reader (for you to read your stock chip's image for me to use as the base for your new tune), and an ALDL cable. For WinFlash, go to Tools->Program PCM and then choose your new .bin file. Testimonials. For those ordering via email, I offer up to three free retunes, optionally (and ideally) using your own DataMaster, FreeScan or TunerPro RT logs to fine-tune the PCM. I recommend using. Third, get a logging program, that will allow you to see how your car is running. Usually, when valves open sooner, the spark should fire sooner. With many aftermarket throttle bodies, in order to get the best possible idle quality and throttle response, the bleed hole will need drilled through to match the design of the stock throttle body. This affects how adjacent blocks of cells are combined when on the edge of a boundary (say right at 30kPa at 1200RPM). With TunerCat, you can then verify whether you have one of the rare revision B calibrations by going to Constants->Fuel Parameters and seeing whether the cylinder volume and injector constants are valid. The PCM is still using the 128 based system for calculations, but you and I see readouts in the form of percentages. Please, no personal checks, as they can take several days to a week to clear, which will hold up your tuning order. Tuner software to get started ($69.95). Most often, this effect can be lessed by increasing line pressure in the areas of WOT (93+ TPS%), and by decreasing the same areas in the "Shift Time" tables. 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. In general, timing advance should decrease as load increases, and increase as RPM increases until the peak torque output is reached. Be certain you edit your file with the correct definition file loaded or your car will not run properly and you could damage the PCM/engine! We?ll assume, from this point on, that you are dyno tuning, but the same principles will apply if you are track-tuning.

What is MPG Improvement? During Closed Loop, the PCM is constantly trying to maintain 14.7:1 air to fuel mix. Be sure you click the download buttons for the actual programs, and not any of the unrelated ad banners on the same page. I recommend gradual changes, 3% increments is a good rule of thumb, until you get a consistent 12.8:1 reading on the dyno graph all the way through the RPM range. More efficient engines will generally require less advance, as the combustion happens quicker and more efficiently, so the spark does not need to be fired as much in advance of the piston reaching TDC. If you are using speed density mode (no MAF sensor), the easiest way to begin tuning fueling and geting the BLMs back to 128 is to run the log through VEMaster. and the methods used to tune for maximum power. You will find changes here will also affect emission output; usually more advance leads to higher NOx and lower HC, with a usual sweet-spot found in the middle somewhere. They can easily be accomodated with the Basic Tune: I accept PayPal for all order types. Switches: simple enable/disable of systems and their respective checks, like CAGS (skip-shift), EGR, AIR, VATS, VSS, etc. Lately, those email providers are randomly blocking emails from my servers. Fuel injector flow; if you swapped injectors, especially to a type rated at a psi different than 43.5. Supporting most GM vehicles from 1994 and up, we are here to offer you mail order tuning, dyno tuning, and also performance parts that are made in … I suggest going no higher than 35kpa or so for disabling DFCO, or you may run into severe RPM dropping or even engine stalling when coming to a stop. 2006 LT1HowTo.com. As you can see with the factory tune, timing levels off around this RPM range. For example, the stock 1->2 shift with little to no throttle is at 11mph; the new value for 3.73 gears would be 10. 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). As mentioned in the "Idle" section above, DFCO has an effect on engine braking and thus also MPG. evaluate where the current tune is and where you need to tune. They are divided by TPS %, which again brings you back to tuning via in-car feedback; only you will know what feels best to you.

For increasing pressure at WOT, especially when upgrading your transmission, you must first increase the Max. This table is also great for getting AFR closer on modified header and/or cammed setups.

If you read my "Tips" page, you will see exactly how it is done.



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