View Poll Results: need a 58mm TB?
Holley 58mm
5
18.52%
BBK 58mm
11
40.74%
Professional Products 58mm
4
14.81%
Port my stock TB to 58mm
1
3.70%
Don't waste my time.....keep the stock TB
6
22.22%
Voters: 27. You may not vote on this poll
Yes...another "do I need a 58mm Throttle Body" thread...???
Thread Starter
On The Tree
Joined: Sep 2004
Posts: 178
Likes: 0
From: ALBUQUERQUE, NM
Yes...another "do I need a 58mm Throttle Body" thread...??? So, if you check out my sig you can see what mods I have done to my car....I am wondering if I really should install a 58mm throttle body or if I am wasting my time.
-Will a larger TB improve driveability?
-Will I experience any significant power gains?
-Is there a mathematical way to evaluate my TB needs?
I have read numerous posts - some suggest yes due to my displacement and cam - then some say no due to the fact i am running forced induction.
Just looking for some input from those with experience. Thx.
-Will a larger TB improve driveability?
-Will I experience any significant power gains?
-Is there a mathematical way to evaluate my TB needs?
I have read numerous posts - some suggest yes due to my displacement and cam - then some say no due to the fact i am running forced induction.
Just looking for some input from those with experience. Thx.
Thread Starter
On The Tree
Joined: Sep 2004
Posts: 178
Likes: 0
From: ALBUQUERQUE, NM
just to close with this one.....i went with the summit 58mm TB - got to tell you I was very surprised at the difference I could actually feel in throttle response.
I had decided to go with professional products, but they are out of stock and I can only order from one place i found on the internet that has them in stock - and their return fee is too high in case I didn't like it.
Weird as it may seem, the surging i was getting around 1500-2000 rpm while cruising is significantly reduced....but unsure as to why. I was getting ready to figure out how to tune this out....but now it is insignificant enough I don't think I will mess with it.
I had the standard throttle return issues that folks have complained about - had to add an extra spring to get the throttle to consistently return to 0% TPS - you would think that after 2yrs of folks complaining about this summit and their supplier would fix it.
I am having some idle issues with the TB and have tried to tune them out.....but I think I will eventually have to do the mods posted out there about these type of TBs - drill the pass through hole and isolate the IAC passage at the rear of the TB - but otherwise pretty happy.
Final numbers - 449 RWHP, 468 RWTQ - good enough for now.
I had decided to go with professional products, but they are out of stock and I can only order from one place i found on the internet that has them in stock - and their return fee is too high in case I didn't like it.
Weird as it may seem, the surging i was getting around 1500-2000 rpm while cruising is significantly reduced....but unsure as to why. I was getting ready to figure out how to tune this out....but now it is insignificant enough I don't think I will mess with it.
I had the standard throttle return issues that folks have complained about - had to add an extra spring to get the throttle to consistently return to 0% TPS - you would think that after 2yrs of folks complaining about this summit and their supplier would fix it.
I am having some idle issues with the TB and have tried to tune them out.....but I think I will eventually have to do the mods posted out there about these type of TBs - drill the pass through hole and isolate the IAC passage at the rear of the TB - but otherwise pretty happy.
Final numbers - 449 RWHP, 468 RWTQ - good enough for now.
What kind of power did your car make before? Just curious what the gain was.
I'm still running the stock TB on my setup (along with a STOCK LT4 intake and SLP 2OTL), and it's making 660 rwhp and runs 10.50's at 135 mph.
I don't think big throttle bodies are nearly as critical on Forced Induction as they are on NA setups.
I'm still running the stock TB on my setup (along with a STOCK LT4 intake and SLP 2OTL), and it's making 660 rwhp and runs 10.50's at 135 mph.
I don't think big throttle bodies are nearly as critical on Forced Induction as they are on NA setups.
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