58mm trottle body and nitrous
#1
58mm trottle body and nitrous
Hey guys,
I did some reading, and lots of ppl. talk about drilling an idle hole for a 58mm TB that does not have it (most aftermarket). I understand this needs to be done?
How will the 58mm TB effect the daily characteristics of my car that has most of the boltons, but otherwise stock heads/cam (for now)?
Can I get away with running a 58mm TB now or do I have to stock with stock or 52mm?
I plan on heads/cam 355 in the near future.
Would a 58mm TB work with my Nitrous Works 75-175 wet plate kit?
Thanks guys.
I did some reading, and lots of ppl. talk about drilling an idle hole for a 58mm TB that does not have it (most aftermarket). I understand this needs to be done?
How will the 58mm TB effect the daily characteristics of my car that has most of the boltons, but otherwise stock heads/cam (for now)?
Can I get away with running a 58mm TB now or do I have to stock with stock or 52mm?
I plan on heads/cam 355 in the near future.
Would a 58mm TB work with my Nitrous Works 75-175 wet plate kit?
Thanks guys.
#2
Re: 58mm trottle body and nitrous
I just read somewhere that the BBK's needed to be drilled out. Don't know how much truth there is to that. A 58mm will be fine for even a bolt-on car. The TB does not have enough influence to change the behavior of the breathing characteristics w/in the plenum. As long as you go with a TB that contains about the same outer dimensions as stock you can use a plate system no problem. The only trouble you'd have is if you went w/ an Accel billet piece which is longer than stock.
Last edited by SS RRR; 09-13-2006 at 03:18 AM.
#3
Re: 58mm trottle body and nitrous
An oversize TB can reportedly cause issues with shifting if you run an A4.
What's the height of the opening in your nitrous plate? Is it at least 58mm tall?
I think the throttle body idle hole issue is getting blown out of proportion. I've run the Holley and the BBK 58mm TB's with no idle problems. Never had to drill a hole and never even looked to see if the TB had a hole directly through to the plenum.
What's the height of the opening in your nitrous plate? Is it at least 58mm tall?
I think the throttle body idle hole issue is getting blown out of proportion. I've run the Holley and the BBK 58mm TB's with no idle problems. Never had to drill a hole and never even looked to see if the TB had a hole directly through to the plenum.
#4
Re: 58mm trottle body and nitrous
Fred the car will idle without the hole but try it and I bet the idle gets better. We are not recommending some freak modification it is replication of a factory function. Many people think they are fine without till they try it.
#6
Re: 58mm trottle body and nitrous
All goes well I will be at Englishtown next month for a b-body raceday. If you are interested you could try mine.
Even with the old ZZ3 cam(mild) setup the idle improved when I drilled it.
Even with the old ZZ3 cam(mild) setup the idle improved when I drilled it.
#7
Re: 58mm trottle body and nitrous
Originally Posted by 96capricemgr
All goes well I will be at Englishtown next month for a b-body raceday. If you are interested you could try mine.
Even with the old ZZ3 cam(mild) setup the idle improved when I drilled it.
Even with the old ZZ3 cam(mild) setup the idle improved when I drilled it.
#10
Re: 58mm trottle body and nitrous
Cars that have working IAC's and are tuned properly do not need any changes. The "drill mod" is popular because most people like to cut corners, or just don't know any better.
#11
Re: 58mm trottle body and nitrous
Like I said we are reproducing a factory feature. I would argue that those of you who neglect it are the ones cutting corners. I have GMs engineering department on my side what evidence do you have????
How is it cutting corners to make sure the TPS is zero and getting IAC counts proper not terribly unlike what you do opening the blades and slotting the TPS we just choose to use the IAC circuit GM though was necessary to cast into the intake as fully as they intended it rather than treating the thing like a carburator and opening the blades.
How is it cutting corners to make sure the TPS is zero and getting IAC counts proper not terribly unlike what you do opening the blades and slotting the TPS we just choose to use the IAC circuit GM though was necessary to cast into the intake as fully as they intended it rather than treating the thing like a carburator and opening the blades.
#12
Re: 58mm trottle body and nitrous
But we ARE getting the correct TPS voltage, correct IAC counts, smooth idle and no split BLM's.... without drilling any holes. I've done it with two different 58mm TB's on my car - Holley and BBK. I've done swaps for people and never had a problem.
#14
Re: 58mm trottle body and nitrous
You just don't get it.... not everyone has a problem with the 58mm TB's and it not rational for you to intimate that anyone who doesn't have a problem is just too stupid to realize they do have a problem. Seems like you have no tolerance to anyone who does not totally, 100% agree with you.
Definitely my last post to this thread, since its pointless.
Definitely my last post to this thread, since its pointless.
#15
Re: 58mm trottle body and nitrous
Oooops.... and just to clarify... YES my TPS sensor has been slotted. It was slotted by the guys that assembled my engine. They couldn't get the TPS voltage below 1.0V, even with slotting the sensor. After I looked at it for a while, I realized that when the removed my NOS electronic WOT switch from the TPS harness, they inadvertantly switched the blue and the gray wires on the harness connector. I rewired it correctly, and the TPS voltage is completely normal, WITHOUT relying on the slots.
Many people slot the holes because they BELIEVE that they have to set it at exactly 0.50V, which is not necessary at all.
Many people slot the holes because they BELIEVE that they have to set it at exactly 0.50V, which is not necessary at all.