Installed TPIS 52mm TB
Thread Starter
Racer
Joined: Mar 2005
Posts: 288
Likes: 1
From: Maple Ridge British Columbia
Installed TPIS 52mm TB
I got my car back late yesterday after having a TPIS 52mm throttle body installed by my local shop. I'm so glad I gave it to them to install. Turns out I really didn't have the time after all and it was a PITA to install as all the bolts were seized. Heck the car is 20 years old and has 100K miles on it.
Any way, the weather cleared late night and I was able to go for a ride. All I can say is wow. There must have been something major wrong with the old TB as this mod made a ridiculous difference in the vette's performance. I suspect that the TPS was out of adjustment or something.
Now the engine pulls harder, faster and smoother. I can't describe just how much of a diference there is. I'm always wary of my butt dyno after spending money on mods, but in this case, the improvements are just so obvious that its crazy.
Any way, the weather cleared late night and I was able to go for a ride. All I can say is wow. There must have been something major wrong with the old TB as this mod made a ridiculous difference in the vette's performance. I suspect that the TPS was out of adjustment or something.
Now the engine pulls harder, faster and smoother. I can't describe just how much of a diference there is. I'm always wary of my butt dyno after spending money on mods, but in this case, the improvements are just so obvious that its crazy.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
On a nearly stock 350 SBC engine going to a 52mm TB has no noticible effect on power, so I agree that something was out of adjustment with your old system.
The bolts that were frozen were the ones under the TB that hold the housing for the IAC. This housing must be removed from the old TB and transfered to the new one. After breaking off one or two of these little bolts during a TB change on my IROC I used lots of PB Blaster on the Vette's TB before tackling the job and all those little bolts just came right out.
Anyway, congrats on getting your Vette's performance back, enjoy.
The bolts that were frozen were the ones under the TB that hold the housing for the IAC. This housing must be removed from the old TB and transfered to the new one. After breaking off one or two of these little bolts during a TB change on my IROC I used lots of PB Blaster on the Vette's TB before tackling the job and all those little bolts just came right out.
Anyway, congrats on getting your Vette's performance back, enjoy.
Burning Brakes
Joined: Mar 2005
Posts: 1,042
Likes: 0
Originally Posted by MacVette86
There must have been something major wrong with the old TB as this mod made a ridiculous difference in the vette's performance. I suspect that the TPS was out of adjustment or something.
Thread Starter
Racer
Joined: Mar 2005
Posts: 288
Likes: 1
From: Maple Ridge British Columbia
I agree, I only bought the 52mm TB because I knew my original was shot. But then again, I bought the car with the 100K miles already on it and it did have the exhaust already modified and the K&N with cut lid. Maybe one of the previous owners also changed the cam? Who knows, all I care about is the vette is working really well right now 
Next for me is long tube headers if the 4+3 holds together. Otherwise its a Keisler 5 speed.
Next for me is long tube headers if the 4+3 holds together. Otherwise its a Keisler 5 speed.
Thread Starter
Racer
Joined: Mar 2005
Posts: 288
Likes: 1
From: Maple Ridge British Columbia
Yep, I'm game for trying the track. I've never run on the drap strip before, so it should be interesting. I was reading all the rules for the track. Have to drain all antifreeze, etc. Lots of pre race work to be done. I think I'll go to a couple of events and check out the track a bit closer before I take my car.
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
Originally Posted by MacVette86
Yep, I'm game for trying the track. I've never run on the drap strip before, so it should be interesting. I was reading all the rules for the track. Have to drain all antifreeze, etc. Lots of pre race work to be done. I think I'll go to a couple of events and check out the track a bit closer before I take my car.
Burning Brakes
Joined: Sep 2004
Posts: 869
Likes: 1
From: Bradford Pa
Originally Posted by MacVette86
Yep, I'm game for trying the track. I've never run on the drap strip before, so it should be interesting. I was reading all the rules for the track. Have to drain all antifreeze, etc. Lots of pre race work to be done. I think I'll go to a couple of events and check out the track a bit closer before I take my car.
i'd tell this track to shove it. drain ALL antifreeze? i'm thinkin that's really not good for your engine...especially if you're stuk in the staging lanes forever like at our "local" track. my vette gets up to 230 in the lanes...if there wasn't anything in there i'd be replacing motors after every run!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Racer
Joined: Mar 2005
Posts: 288
Likes: 1
From: Maple Ridge British Columbia
Sorry, I should have siad drain antifreeze and replace with water I guess thet don't want cars overheating and losing antifreeze all over the place. But it is a pain in the but to have do this just to take a couple of runs down the track.
I guess thet don't want cars overheating and losing antifreeze all over the place. But it is a pain in the but to have do this just to take a couple of runs down the track.
5th Gear
Joined: Jan 2005
Posts: 5
Likes: 0
52mm Throttlebody
I replaced my stock 48 for a 52 at extremefi.com and i definetly could feel a SOTP difference both at throttle response and just plain low end grunt. old t/b had a worn shaft only and i kept it clean,adjusted to spec always. This is a great improvement.
