Just wondering if anyone can tell me about it. I loaded a tune yesterday that had this table modified ( by accident) and it made my throttle response better. Didnt notice the change till i was doing a compare so i then researched it to see what it did. After researching i found people to say if you changed it it could disable the PCM. So i loaded the table back in thats been in my truck.

What i want to know is how i have found numerous stock tunes with variations in this table from one to another. CAn it be modified without messin up the PCM or whats the deal. I posted about it on HPT forums but as usual i doubt anyone will respond.

 

Dont everyone reply at once. haha

 

It has the risk of causing problems I’m sure or HP wouldn’t have included the following warning, however I’ve seen some pretty aggressively modified tables and have never seen where one has had an issue.

This is what you should see in HP:
WARNING!!! Modify this table at OWN RISK. Incompatibility of this calibration with the vehicle TAC module calibration may render PCM permanently inoperable.

On my ’01 model with ETC, the original calibration was unlike any other year model calibration I’ve come across, in that it didn’t allow for over 85% throttle opening. Strange to say the least. I feel you should be reasonably safe modifying this table, especially using some constraint and not typing in something like a 100% across the board or anything like that. I use some pretty aggressive opening rates myself and never had an issue. Especially since you noticed a response improvement and didn’t have an issue, I would load your previous file back into it.

 

I am getting some feedback on HPT but so far no real answers... I search my VIN and the VIN for the other tune with GM to check for possible updates and neither VIN showed a update to the engine files.

It actually may have been too touchy with the other tune, I drove it yesterday for the first time with the TVS and I was pleased with the throttle response so I dont want it to be too touchy incase I have to let the wife drive it for some Odd reason.

 

EFILive has a similar warning. I think not changing it more than 5% is mentioned. If you try to set 100% throttle at 20% pedal you probably have a good chance of blowing a protective circuit in the PCM.

I actually knocked 50% off the lower half of my table (dual TBs), then blended it. So I don't think going down more than 5% is an issue.

Maintaining a lower slope to the table in your normal daily driving/cruising throttle range allows for better throttle modulation/vehicle control. So I wouldn't go crazy with that. You can increase the slope a little above that area as you are usually on your way to WOT anyway if you are over say 60% pedal.

Before I adjusted the table for the dual TBs I had to sit and give the car ahead of me a running start before I would start up again in traffic.

 

There is very minimal difference between the two tables that I have one is just a bit more touchy at lower RPM the 40% and up are basically very similar.