52 o58 mm TB
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Joined: May 2002
Posts: 260
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From: sweden
Car: Firebid Cab-92/1989 TTA
Engine: 383 HSR TPI
Transmission: TH700r4
Axle/Gears: 4.10
52 o58 mm TB
Hi!
Were are the limit for my 52mm trottle body?
Will i gain anything by swapping in a 58mm?
The car making arround 370fwhp.
Were are the limit for my 52mm trottle body?
Will i gain anything by swapping in a 58mm?
The car making arround 370fwhp.
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Joined: Aug 2007
Posts: 1,341
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From: Southern Wisconsin
Car: 1988 Camaro
Engine: 383 Stroker
Transmission: Probuilt 700 R4
Axle/Gears: 3.73
Re: 52 o58 mm TB
Keep the 52. Thats what I am using. Unless your going to make 600 hp or a power adder, keep the 52 and save yourself some money
Senior Member
Joined: Apr 2004
Posts: 587
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From: Calif
Car: 75 Vette
Engine: 406 TPI
Transmission: 700 R-4
Axle/Gears: 373
You have a long way to go before you would need a 58mm 
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: 52 o58 mm TB
Another point of view as posted on another thread. One I agree with by the way. 
"Also having a 383 HSR I can tell you that I went from a BBK 58mm throttle body to the Accel 1000 CFM throttle body. My tuner and I got bored threw it on there just to see what would happen. It resulted in 10 rwhp and 10 more ft lbs of torque to the wheels. My throttle response also went up. I would recommend getting an aftermarket TB and go at least 58mm."
Bottom line is you won't lose anything but you stand a chance to gain some horsepower. Also you are ready to go for future mods.
"Also having a 383 HSR I can tell you that I went from a BBK 58mm throttle body to the Accel 1000 CFM throttle body. My tuner and I got bored threw it on there just to see what would happen. It resulted in 10 rwhp and 10 more ft lbs of torque to the wheels. My throttle response also went up. I would recommend getting an aftermarket TB and go at least 58mm."
Bottom line is you won't lose anything but you stand a chance to gain some horsepower. Also you are ready to go for future mods.
Senior Member
Joined: Sep 2007
Posts: 1,091
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From: West Central Ohio
Car: 86 vette
Engine: 383
Transmission: 700R4
Axle/Gears: 3.07
Re: 52 o58 mm TB
Get a good vacuum gauge, if you have no readable vacuum, in the plenum at WOT, then it is doubtful more is better. Scan/read your map, can you get close to 100 kpa? There is also restriction in the air cleaner/intake system, so look there. Everything has to be matched/bigger for best results.