Desired Pedal Area tuning for Throttle Response

[Racecar]

My C5 runs great at WOT with a 233/239 cam and 90mm TB, NA. Overall the tune is good, VE and timing tables are tuned. The only problem is throttle response. If you are cruising at 3000 rpm, and give it a small throttle input, there is a dead spot, or throttle lag. Downshifting for road racing is a problem with this throttle lag. I recently made a small change to the injector timing, that helped.
Now I am looking at Desired Throttle Area.
I see the warning about permanent damage. How much change is safe. Will this short out the PCM if I change too much?
Has anyone successfully changed this? 2013-10-27 19_12_25-.jpg

[nkautz]

Lol, I posted almost exactly the same question about a month ago. I had just installed the Nick Williams 102mm throttle body and it had a bad deadspot from around 15-30% TPS. I contacted HPTuners asking about the warning on those ETC tables and they said that changing them can indeed harm your TAC and/or PCM and render them useless until replacement or repair.
They said that the amount of adjustment of the tables that you can get away with will vary from car to car and there's no way to know how much is too much until you fry something. Sometimes it will fry right away , and sometimes your car will seem to work fine for a while and then suddenly you get REP and no communication with PCM.

I remember reading a few threads on this forum in which people talk about how they accidentally harmed they're electronics with these tables, so it's definitely real.

I ended up switching to a ported 90mm LS2 TB and now there is no dead spot anymore.

[Brice]

What year is your car ?
Look at the alternate desired throttle area. Some 2001-2004 are different and used for the competition mode.
The pedal has less lag.
You can safely paste and cut the value on normal desired throttle area.

[Racecar]

99 Corvette with the stock ECU. It has had this throttle lag every since I built the 6.2L race motor with the 90mmTB and 233/239 cam. My Desired Pedal Area Normal is in post #1, Desired Pedal Area Alternate is all 00's. If my electronic throttle is not opening 1:1 when I step on the pedal, that could explain everything. If I change this pedal area it too far, does it permanently damage the ECU, or does it just set codes and needs to be re-programmed?? Thanks in advance, this has been a mystery for years.

[Brice]

Which 90mm do you have ?
Is the blade silver or gold ?

I've done a LS3 H/C on a C5 one month ago, you need a 05-08 TB. (the silver one).
No issue with it.
I've got a VRX5/TFS 215 on my LS1 with 90mm TB (similar cam). works fine with stock TB parameters.

[Brice]

Which 90mm do you have ?
Is the blade silver or gold ?

I've done a LS3 H/C on a C5 one month ago, you need a 05-08 TB. (the silver one).
No issue with it.
The 09-13 TB is different and works not well. Reduced power mode and is not fully open @WOT.

I've got a VRX5/TFS 215 on my LS1 with 90mm TB (similar cam). works fine with stock tb parameters.

[Racecar]

[QUOTE=Brice;336742]Which 90mm do you have ?
Is the blade silver or gold ?

The blade is silver. It's a ported GM 90. For road racing, downshifting and braking are really important. Go fast down the straight, brake late, slow it down, then (rap rap rap) heel and toe downshift before turning into the corner. That's the right way to do it. But with this throttle lag, I can't really rap the throttle, Nothing happens. It sounds like changing those desired area tables is what I need, but that it taboo. Am I going to have to put a cable throttle on to get response.?

I had a 600 hp small block in a road race car with a 750 holley. That thing would rev in a micro second. My LS is not even close to that.