Recently I had the car on the dyno and have been driving it around a couple of days each week. I've noticed that if I'm cruising at a steady speed and bump the car into nuetral(6 speed) the car will try to hunt for idle. Typically this will happen when I approach redlights and/or stop signs. So, I called the tuner, explained the situation and he stated that I should drill a 7/32" diameter hole in the TB plate.
I've heard of doing this before, but is this REALLY the correct way to solve the problem?
The car has a LS2 shortblock with L92 heads, LS3 intake/TB (no portwork on heads/intake/tb) and a custom cam, 236/244ish, ASP underdrive, Longtubes, catless X and corsa catback.
you need a new tuner. This was done back in the LS1 edit days, when there was no better option out there. With HPTuners and EFI live there is no need. Use someone else
I have seen cars that needed a hole drilled to keep the idle blade opening in check but the setups are alot more extreme than yours.With your setup it looks like it just needs the base airflow adjusted. Pretty simple.
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Old car-2002 Electron blue C5
Z06 catback,Edit tuned.
A+A P1 kit,Kook longtubes
507hp/477tq
1.63 60'
10.7 at 129mph 1/4 on Nitto's
Now makes 600rwhp on stock block/pump gas
2005 Avalanche,SOM,Corsa,tuned ,Single turbo kit 450hp/475tq at 7lbs of boost.
I have seen cars that needed a hole drilled to keep the idle blade opening in check but the setups are alot more extreme than yours.With your setup it looks like it just needs the base airflow adjusted. Pretty simple.
From my understanding, the technical reason for the hole in the TB goes back to the "drive by cable" applications (i.e F-Bodys) as you needed to let more air in for modded (cammed) engines and still maintain the Idle Air Control (IAC) valve steps at idle to be in the 40-60 range (and mv's) to allow idle sufficient open (more air)/close (less air) adjustments.
Electronic Throttle Control egines don't usually need this as the PCM can adjust the throttle blade (tuner has control of these parameters) and the IAC is no longer used.
From my understanding, the technical reason for the hole in the TB goes back to the "drive by cable" applications (i.e F-Bodys) as you needed to let more air in for modded (cammed) engines and still maintain the Idle Air Control (IAC) valve steps at idle to be in the 40-60 range (and mv's) to allow idle sufficient open (more air)/close (less air) adjustments.
Electronic Throttle Control egines don't usually need this as the PCM can adjust the throttle blade (tuner has control of these parameters) and the IAC is no longer used.
JMHO
Ed M
That is true. But I've had Vette's idle at 30% throttle before.This is when the hole helps.
Also,alot of people over port the TB which does the same as a hole,just no hole.
As said though,the small setup above just needs tuning to correct.
__________________
Old car-2002 Electron blue C5
Z06 catback,Edit tuned.
A+A P1 kit,Kook longtubes
507hp/477tq
1.63 60'
10.7 at 129mph 1/4 on Nitto's
Now makes 600rwhp on stock block/pump gas
2005 Avalanche,SOM,Corsa,tuned ,Single turbo kit 450hp/475tq at 7lbs of boost.
Corvette Store
Drill a hole in the TB Plate?
