Frequently asked HPTuner questions

[Doc]

DISCLAIMER - I AM NOT RESPONSIBLE FOR THE CHANGES YOU MAKE TO YOUR CAR

Ok, let me go one thing at a time..

The rev-limiter
Engine>Fuel Control>Fuel Cut-off>RPM Limits
change the Fuel Cutoff RPM P/N vs. ECT to your desired rpm
change the Fuel Cutoff RPM vs Gear to your desired rpm
change the Fuel Cutoff RPM 1st Gear vs. Time to your desired rpm


Eliminating the rear O2 sensor
Engine Diagnostics>DTC's
for the following codes, uncheck the SES option and set the ERROR MODE to 3-No Error Reported

P0036
P0054
P0136-P0141
P0420

I believe thats it, all the ones you want to turn off are labeled HO2S..........sensor 2

For those without a cat, also turn off COT (set the values to 0)
Engine>Fuel Control>COT Lean Cruise>COT Adder Max
Engine>Fuel Control>COT Lean Cruise>COT Adder Min

Now, I use another couple tricks.

Limited boost in first
Engine>Torque Management>Supercharger>Max Boost 1st Gear

Labels 4000/4250/ 4500/4750/5000/5250/5500/5750/6000/6250/6500-8000 (at 100%)
Max Boost 40/45/55/60/65/75/80/85/90/95/100

Torque Management
Engine>Torque Management>General>Spark Retard vs Torque Reduction
set all values to ZERO
Transmission>Torque Management>Abuse Mode>Trans Abuse Mode Torque Reduction vs. RPM
set all values to ZERO
Transmission>Torque Management>Torque Reduction>Torque Reduction vs Torque vs Shift-Normal
set all values to ZERO
Transmission>Torque Management>Torque Reduction>Torque Reduction vs Torque vs Shift-Performance
set all values to ZERO


DISCLAIMER - I AM NOT RESPONSIBLE FOR THE CHANGES YOU MAKE TO YOUR CAR
these are simply ways to accomplish a goal.

[bc3tech]

excellent post doc... thanks :)

*slap* sticky!

[Doc]

"shut off" closed loop

Engine > Fuel Control > OL & CL > Open Loop
> Gas (Gear): Set EVERY cell to 1.00
> Gas (P/N): Set EVERY cell to 1.00

Engine > Fuel Control > OL & CL > Closed Loop; Closed Loop Enable
> ECT vs Startup ECT: Max EVERY cell out @ 306
> O2 Readiness ECT: Max EVERY cell out @ 493

[MGM1979]

I always mix this up, and it's been a while - for speed density tuning, we WANT to "shut off" Closed Loop (or otherwise throw the car into Open Loop), right?

[Doc]

correct

[Doc]

from the help files for HPTuners

First things first…determine what the car is going to be used for mainly. This tuning guide is for semi mild setups as in the end we will be putting the car back in closed loop. If you plan on having a complete racecar that rarely or never sees the street an open loop speed density tune might be the answer. I’ll get to that in my next write-up since there are a few differences in how things will be done.

[Doc]

taken from RLF
This is a how to guide on how to properly dial in air to fuel ratio.
*EDIT* If anything on this guide isn't making complete sense to you, Do some reading at hptuners.com/forums. This is basically a spoon feeding guide and involves the basics on how to tune your VE/MAF/AFR - what makes or breaks a good tune.
I am not liable if you blow up your car. *EDIT*
*EDIT 2* Pics added. Sorry pics are so small, right click save as. *EDIT*
Disable dfco
Disable LTFT
Disable STFT
Address the open loop table
Disable COT
Disable piston protection
Dialing in your power enrich table



-to disable DFCO just set the enable temp. to 300 or higher, you don't need to change the other dfco settings. (unless you really want to!)
http://i134.photobucket.com/albums/q115/Shaunmcdee/Tuning/Disabledfco.jpg

-to disable LTFT do the same thing, set the enable (min.) temp. to 300 or higher.
http://i134.photobucket.com/albums/q115/Shaunmcdee/Tuning/DisableLTFT.jpg

-you should also disable STFT by modifying the 2 tables under the closed loop heading.

-ECT vs Startup ECT - set the whole table to 300
-O2 readiness ECT - set the whole table to 400
http://i134.photobucket.com/albums/q115/Shaunmcdee/Tuning/DisableSTFT.jpg

Then there are 4 tables you need to modify under the 'open loop' heading because they can apply a factor to the fueling calcs.

-Gas(Gear) set the whole table to 1.00
-Gas(P/N) set the whole table to 1.00
-IVT Gain set the whole table to 1.00
-EQ Ratio Min set the whole table to 1.00
http://i134.photobucket.com/albums/q115/Shaunmcdee/Tuning/Openlooptable.jpg

While you are calibrating your air and fuel you should also disable Piston Protection and preferably COT too because they can also complicate the fueling calcs.

- Disable Piston Protection by setting it to 8192
- Disable COT by zeroing out the 2 adder fields, and setting the temp. thresholds to 7400.
(Note that disabling COT can cause damage to your Catalytic converter if you have one!!! because it can be left to overheat!!)
http://i134.photobucket.com/albums/q115/Shaunmcdee/Tuning/DisableCOT.jpg
http://i134.photobucket.com/albums/q115/Shaunmcdee/Tuning/Disablepistonprotection.jpg

- To dial in your power enrich table, or AFR for wide open throttle, Simply divide stioch AFR (14.689 or 14.7) By the AFR you would like to see.
For example in this case well say 11.8.
14.689/11.8 = 1.2448 (usually the first 5 numbers are enough to use)
Now place the 1.2448 in the power enrich tab > eq ratio vs rpm table. Do so across the entire board making your PE curve as flat as possible.
http://i134.photobucket.com/albums/q115/Shaunmcdee/Tuning/SetupPE.jpg

As far as your timing tables go, I would just use the gm factory timing tables as starting points, just to keep things safe.

Now, drive your car around as smoothly as possible without any sudden throttle changes. You want to be as dead on as possible. That will help dial in your cruising mafs ranges. To tune for WOT simply mash the gas.

Use your hpt scanner to read maf error %. Or VE error %
Get the results from the scanner, after you have at least 30 hits on every cell you want to adjust for. Copy the results from the scanner, and paste them to your tune's MAF freq table under the airflow tab. Or the VE table located in the same tab. Use hand smoothing when possible. REFRAIN from using the auto smooth option for all that is holy.

Initially, you would like the maf or VE error % to be as close to 0 as possible. -4 or +4 are not close enough. Make a valid attempt to get it into the 1s at the very least. Also, Its always better to be in the negatives then the positives. So shoot for -1 if possible.

Thank you Omega for submitting this:

Thought I'd add;
To tune the VE, set Engine Diagnostics -> Airflow -> MAF Sensor -> MAF Fail High to 0Hz to disable the MAF
You'll need to copy the high octane table to the low table

To tune MAF, set Engine -> Airflow -> Dynamic Airflow -> High Disable -> to under 500RPM
and Engine -> Airflow -> Dynamic Airflow -> High re-enable -> to 100RPM less than the disable setting to disable the VE.

Thats all there is to it. These same settings should be used whether you are maf tuning or ve tuning. The only difference is whether the maf is enabled or disabled.

Huge thanks to everyone who has helped me with VE and MAF tuning when I didnt know any better. It may have been some time in the past, but you are not forgotten. :bluecap:

[Doc]

more....
Thought I'd add;
To tune the VE, set Engine Diagnostics -> Airflow -> MAF Sensor -> MAF Fail High to 0Hz to disable the MAF
You'll need to copy the high octane table to the low table

To tune MAF, set Engine -> Airflow -> Dynamic Airflow -> High Disable -> to under 500RPM
and Engine -> Airflow -> Dynamic Airflow -> High re-enable -> to 100RPM less than the disable setting to disable the VE.

[Doc]

more....
Fuel Trim Method
• Reset the fuel trims. Using the scanner, connect to the ECU. Under VCM Controls -> Fuel & Spark -> Fuel Trim Learn, click on Reset Fuel Trims.
• Allow the ECU to relearn the VE fuel trims. It can take up to 100 miles to learn the trims. In this time, try to have all the cells learned. It helps if you have the VCM scanner in the car while doing this, so you can see what cells have been learned.
• Create or load the VE vs LTFT + STFT histogram, with minimum cell count at 5. Alternately, you can log LTFT and STFT separately. Record the average values.
• When the engine is at operating temperature, begin to log
• Try to encounter as many normal driving conditions as possible. Drive as smooth as possible, and try to fill as much of the table as possible. Also, try to get more than 50 hits per cell in the more used areas. Remember though, you can’t accurately tune WOT via fuel trims.
• Copy scanner data
• Open VE table
• Paste Special -> Add and smooth. If you logged LTFT and STFT separately, you will need to add both.
• Save and re-load new calibration
• Repeat until the all of the trims are in the 0 to -5 range.

[Doc]

hell.....here

Maf VE tuning - Saturn ION RedLine Forums (http://www.redlineforums.com/forums/tuning-electronics/40891-maf-ve-tuning.html)

[Doc]

another
HPT: How to Tune Torque Management (MAP and Torque Methods) - Saturn ION RedLine Forums (http://www.redlineforums.com/forums/tuning-electronics/14391-hpt-how-tune-torque-management-map.html)