52mm throttlebody
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Junior Member
Joined: Mar 2001
Posts: 39
Likes: 0
From: ORLANDO FL USA
52mm throttlebody
would it be overkill?
gutted maf/air box, k&n, msd, accel cap/wires, ported plenium, stock manifolds but cat is gone and have 3.5 exhaust w/flowmaster, relocated mat, water/alochol injection, 1.6 rockers
gutted maf/air box, k&n, msd, accel cap/wires, ported plenium, stock manifolds but cat is gone and have 3.5 exhaust w/flowmaster, relocated mat, water/alochol injection, 1.6 rockers
Supreme Member
Joined: Dec 2000
Posts: 1,536
Likes: 0
From: Springfield, MO, USA
Car: 1986 Trans Am, 1991 Firebird
Engine: 355 TPI, 3.1L V6
Transmission: 700R4 in both
This should have been posted in the TPI section but since it's here I'll reply!!
You don't need the 52mm throttle body if you have the MAF and the stock chip because the ECM limitations will only allow the MAF to flow approx. 440 CFM (255gm/sec) max even with the gutted MAF! You actually MIGHT get close to 500 CFM with the gutted MAF!! However, the stock INTAKE is the most restrictive part on the TPI system and if you haven't done any work to it at all then the extra air that the 52mm throttle body will allow through is useless!! You said you ported the plenum but didn't say anything about the intake!! Until the intake is modified just stick with your stock 48mm throttle body!!
You don't need the 52mm throttle body if you have the MAF and the stock chip because the ECM limitations will only allow the MAF to flow approx. 440 CFM (255gm/sec) max even with the gutted MAF! You actually MIGHT get close to 500 CFM with the gutted MAF!! However, the stock INTAKE is the most restrictive part on the TPI system and if you haven't done any work to it at all then the extra air that the 52mm throttle body will allow through is useless!! You said you ported the plenum but didn't say anything about the intake!! Until the intake is modified just stick with your stock 48mm throttle body!!
Joined: Jul 2000
Posts: 7,386
Likes: 1
From: In a mint Third Gen!
Car: Red 87 IROC-Z28 T-Top
Engine: 5.7 Tuned Port Injection
Transmission: 700R4 Auto
Axle/Gears: BW 9-Bolt 3.27
U don't need 1 until that engine is making lots of HP and TQ, from mods like heads and cam. 
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