My current motor is a ls6 replacement crate motor that was sent by Chevy to replace the stock ls6 that broke under warranty. I had installed a set of Patriot ls6 cnc style heads with stock compression and combustion chambers. I am using Patriot's 226/226 112lsa .585 lift cam. I also installed a ported throttle body. After the motor was tuned the tuner stated that if the motor continued to surge at idle with the ac on or continued to stall when coming to a stop in traffic to drill a hole in the throttle plate. Well I dont believe drilling a hole in the throttle plate will stop the surging. I contacted the machinist that sold me the throttle body, this guy has over 30 years of building all sorts of motors, he told me to absolutely not to drill the hole in the throttle that the surging at idle should have been taken care of with the tuning. And if I remember correctly there is a hole drilled from the factory in f-body throttle body plates, well no insult meant to the f-body guys, this is a Corvette Zo6 not a Trans-Am or Camaro.
Drilling a hole in vette TB's is common practice to get a cam car to idle and reduce surging. You can tune around it, but from experience I can tell you it hurts nothing and makes life much easier. I drill them as a starting point for tuning many times. Especially if the cam is on the stout side.
However, you still need to fine tune idle, surging and stalling out. Whether you drill the TB or not, tuning is required to make the car run right and it can be done given your combination of goodies.
I'm sure if you asked 100 people 50 would say drill it and 50 would say don't.
I haven't ever found a reason to drill a hole in a Vette TB. You can 100% of the time tune around this if you have reasonable experience. Now on some F-Bodies drilling a larger hole might be the answer but not with the Vette and fly-by-wire TB.
You need to visit another tuner with more experience...........
Do not drill a hole in you TB. The issue you're experiencing can be tuned out.....it just takes a bit more time and experience. There are a lot of cars running bigger cams that don't have that problem.
I had the same problem on my blower car and couldn't get it right no matter what I did. I took it to A&A in CA and they fixed it up with tuning no hole drilled in TB it ran and still runs great, no stalling or surging at all.
Alot of folks (and shops) drill the TB. It's no big deal. Yes, it can be done without it but in all honesty, why bother spending alot of time tuning when drilling it makes most cars drivable. It will need a final tune though.
Alot of folks (and shops) drill the TB. It's no big deal. Yes, it can be done without it but in all honesty, why bother spending alot of time tuning when drilling it makes most cars drivable. It will need a final tune though.
Cuts time, saves money and hurts nothing!
JMHO
Why waist time doing it right? Drilll a big hole in it and worry about it later.
Take it to somone who knows how to tune it. You spent the money to get it this far do it right and tune it.
Why waist time doing it right? Drilll a big hole in it and worry about it later.
Lots of experts out there.
Like I said the first time, ask 100 people and you'll get as many different answers. The original question was can it be tuned. Part of my first response was "Whether you drill the TB or not, tuning is required to make the car run right and it can be done given your combination of goodies".
Heh heh heh,,, I see I made ya had ta go back and raise your HP/torque numbers on your profile ..
I must be a super tuner!!!! I can make your numbers go up just by making a post!
I guess I'll go back and do mine... HMMMM What shall I pick, what shall I pick???? I'll pick 509.9 hp and 470 lb/ft of torque.. (w/o the 100hp n2o shot)
Though I'm having fun, I gotta let this thread go.
Have a great day!
Last edited by Fastbasser; 11-26-2005 at 07:18 PM.
Heh heh heh,,, I see I made ya had ta go back and raise your HP/torque numbers on your profile ..
I must be a super tuner!!!! I can make your numbers go up just by making a post!
I guess I'll go back and do mine... HMMMM What shall I pick, what shall I pick???? I'll pick 509.9 hp and 470 lb/ft of torque.. (w/o the 100hp n2o shot)
Though I'm having fun, I gotta let this thread go.
Have a great day!
and your only in the 11 sec club? Maybe it needs a little more tuning work. With those numbers it should be quicker.
FWIW. My cam...239/251, 106 lsa.
I've done it both ways..with and without a drill.
Idle Transition tuning seems to be a little more accurate without the hole.
I do my tuning.
__________________ There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games. - E. Hemingway
And if I remember correctly there is a hole drilled from the factory in f-body throttle body plates, well no insult meant to the f-body guys, this is a Corvette Zo6 not a Trans-Am or Camaro.
No holes in the F-bodies from the factory, must be a myth. And careful what you say about F-bodies. My WS6 would run with the Corvettes at the track and cost less to keep it going. ( Once I put a Turn One power steering pump in, the first 3 OEM pumps were not cheap)
Corvette Store
Can this be tuned away?
Why waist time doing it right? Drilll a big hole in it and worry about it later. 
