lt1 pcm tuning

Fourth, with your ALDL cable connected inside your vehicle and to your computer, turn your ignition to ON, wait 5 seconds, then click the "Start Communications" button in FreeScan. If you like the TCC to lock (and stay locked) while cruising (like OEM), you will usually need to uncheck the switch for "TCC Unlock on Rapid TPS Decrease" because of how stalls flash the RPM in such a wide range. Connect your ALDL cable to the ALDL port in your vehicle and in to your laptop; make sure both ends are securely attached.

When the PCM enters PE mode can also be modified, both by RPM and throttle position; by default, it is at less than full throttle, how much so depending on RPM. Yes the PCM is designed to compensate and learn, but even with the learning the car can run rich or lean. This is when you have "the pedal to the metal," or the throttle is fully open.

When it came time for emissions testing, the car failed?miserably rich. As you can see with the factory tune, timing levels off around this RPM range.

Do you need a good tune, but cannot afford the down-time of mailing your PCM to me?

1.01), and cooler cylinders should be lessened (ex. You can use this data in the same way as in tuning part-throttle. Advancing timing in non-idle closed-throttle areas, like coast-down, will also affect MPG, and help to keep the engine from stumbling or stalling in setups that have more valve overlap than stock. Free Tips. I have some basics and tips I've picked up as I've tuned my own 1995 Camaro Z28.

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.

More advance is necessary with less efficient engines or range of engine operation, such as the low load and RPM sections of an engine that has a cam with a lot of valve overlap (more further below). Besides the two main timing tables, it is also a good idea to increase advance in the closed-throttle table; this is when the engine is idling, either at a complete stop or while cruising.

Timing makes a large difference in combustion efficiency. Therefore, if you are tuning your timing in the "cruising" area--for example, in 4th gear in an M6--you will find both the approximate MAP value and TPS % needed to keep this cruising RPM. I suggest starting with increments of 5, whether to soften or firm the shifts. Copyright © Generally, a leaner fuel mixture will increase combustion temperature. 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). To lean the fuel mixture (BLMs < 128), simply decrease the appropriate MAF cells as mentioned above. For off-idle, without a dyno, with the car in park you could set the throttle to about 20% (with a stick on the pedal, or someone else holding it down), and then measure; or, for tuning while the car is moving, install EGT sensors into each cylinder exit point on aftermarket headers, and either be able to log their readings or have someone in the car with you doing it. Exhaust temperature will also affect voltage, meaning at a different exhaust temp you may be at the same AFR but the sensor will read a different voltage.

Welcome to PCMforless, bringing you more than 25 years combined experience in the automotive racing and fuel injection tuning industry. It will tend to make throttle response "crisper.". ", For TunerCat, be sure that "PCM_EE" is chosen under "PCM.". You will use this value for your "DFCO MAP Disable" value; but, be careful you don't set it too high, or you will run into engine stalling when coming to a stop.

It is best to start with all cylinders at 1.00, and first have the BLMs close to 128 from VE/MAF sensor table tuning. After logging for about 10 or 15 minutes you will have enough data to make your first changes, depending on whether you are using a MAF sensor or running in speed density mode.

One way to increase MPG is to lower this value. I, like you, am a car enthusiast who has found the value and fun-factor in the LT1 engine.

Then, you can use the cable to datalog the vehicle running with it so that I can fine-tune things and email you updated tunes that you can burn onto the same chip (it is eraseable). Using these BLMs, one can sense whether there is a problem with something mechanical; things like exhaust leaks (the BLMs will rise, as the O2 sensors sense unmetered air thinking the combustion is running lean), or fouled spark plugs or O2 sensors (the BLMs will decrease, as the O2 sensors see less air and think the combustion is too rich). Why? Internet connection - you will download the required drivers and software from the Internet using links I will provide. Generally, a more efficient combustion will produce more vacuum (lower kPa).

This means more timing advance; especially at low-RPM, part-throttle areas of driving.

# 16214399, 16242921), and 1997-2005 OBDII LS1 F-/Y-Body vehicles and trucks (serv. For WinFlash, go to Tools->Program PCM and then choose your new .bin file. You will need an adapter from Moates to easily install the new chips (G1 for TPI/LT1, G2 for TBI).

For '86+ TBI (1228063), you will need a socket that must be soldered directly onto your stock PCM.

A good tune will never be achieved if something mechanical is in need of fixing or replacing.

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. The way to find the ideal spot is to log your driving and see what the lowest kPa reached during cruising is, and set it a couple points below that. Dynos of LT1s have shown they tend to make more power toward the richer end. For the Cable Loan kits, I pay to ship the kit to you, and you pay to ship it back (the opposite of the Postal methods). 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).

This is directly related to line pressure to the transmission; the higher the psi, the firmer the shift. cleanest from an emissions standpoint) mixture ratio.

Depending on whether you are rich or lean on the first pull, fuel will need to be added or What setups need or benefit from Power Tuning? You can also look at your MAP and airflow (when using a MAF sensor) values, which will let you know how efficient the combustion is; the more efficient it is the more vacuum will be pulled (= lower kPa values) and the less airflow will be required (lower gm/s reading from MAF). What you are doing is telling the PCM you have the equivalent of larger injectors that flow more, so they won't be pulsed as long (as the higher fuel pressure is a "replacement").

For replacements, I suggest using only AC/Delco brand, as other brands have caused problems for some people. The easiest way to tune them if you have a MAF sensor is to simply disconnect the sensor; the fans will run and the SES will come on, but you will be in speed density mode.

For those ordering via postal mail, I offer one free retune if you pay for shipping both ways. But, with day-to-day driving we cannot indiscriminately advance timing because of octane limits, or we would quickly run into detonation (knock/pinging). Open Flashhack and click the "Read Calibration" button. So, for stock 24# injectors running at 60psi of fuel pressure, you'd do 60 / 43.5 = 1.379; then sqrt(1.379) = 1.174; then x 24 for a new injector constant of 28.18.

What is the highest MAP value reached when coasting begins? Once signed up, you will be issued a customer number, which, along with your chosen password, you can then use for the PCM tune order form. Too much timing advance tends to produce a bucking/skipping in throttle response, much like not having enough fuel. 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.). No more downtime, and a fully tuned vehicle! 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.

You can also click the "Engine Data" tab to see necessary feedback like BLMs, INTs, O2 voltage, MAP KPa, knock, etc. Having them much different than 128 will cause your engine to not achieve the most power or MPG it could, and can even cause dangerous lean conditions in extreme cases. You can use those values, along with your known power-band, to modify your shift points. You begin with the base tuned file I will send which will be set to your setup's specs, which is for what you are paying: one base tune (like the Postal method). I must address some caveats before I delve into the meat of the article. After installing a different cam in your LT1, timing and to a degree also fueling will play an even bigger role in both drivability and power. Use my free "Tips" page or buy the PDF version for a small fee, and get started!

The other side of transmission tuning is shift firmness. To richen your fuel mixture (BLMs > 128), increase the value(s) you found as mentioned above. It is a great program, also known as Computer Automotive Tuning Systems (C.A.T.S. Too little timing advance tends to kill MPG and power, giving a lazy feeling to throttle response. You'll see lines for RPM, speed, spark timing, and knock retard. With engine changes like cam, heads, etc., this is an especially important area for tuning, with great results achieved in drivability and fuel MPG. This method assumes that your vehicle is in good running order. Because of the decrease in vacuum pulled with "bigger" cams, the stock settings for DFCO will never be reached and will need to be increased. Where this happens will depend on the amount of vacuum that your cam pulls, so check your data-logs and be sure your spark advance is increasing from idle to off-idle, or else you will get bogging and back-fires off-idle. In closed loop, when the oxygen sensors are functioning, I tell the PCM to use a lower voltage as the ideal point in order to make it run leaner. This process is pretty much the reverse of the above. Contact.

This way, you can easily ramp the AFR down (richer) toward the torque peak of your engine using values like -1.2, -0.8, -0.4, etc., finally ending at the ideal AFR at the torque peak of your engine (stock, 2800RPM) using 0.0 in the RPM table. With your ALDL cable connected inside your vehicle and to your computer/laptop, turn your ignition to ON, but do not start the engine, and wait 5 seconds. There are at least two main ways to affect MPG: fueling and timing.


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