Does anyone have any "proof" showing a 52mm TB on a stock car can hurt performance?
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Tracy
2002 C5 M6 Convertible
1994 Z28 M6 Convertible
Current Mods:
SLP Ultra-Z functional ramair, SS Spoiler, STB, SFCs, Headers, Clutch, Bilstein Shocks, and TB Airfoil. 17x9 SS rims with Goodyear tires, 160F T-Stat, MSD Blaster Coil, Taylor wires, Hurst billet shifter, Borla catback with QTP e-cutout, Tuned PCM, 1LE Swaybars, 1LE driveshaft, ES bushings, White gauges, C5 front brakes, !CAGS, Bose/Soundstream audio, CST leather interior, synthetic fluids
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Just out of curiosity, do you mean stock as in a stock motor with bolt-ons, or bone stock everything?94 Black T/A GT, Advanced Induction 355, 3200 stall, built 4L60E, Moser 9", Baer Brakes, Shooting for 11s... -
Stock everything. I've heard in the past a bone stock car will actually lose a little power with a 52mm TB. I'm looking for proof.Originally posted by Craig 94 TA GT
Just out of curiosity, do you mean stock as in a stock motor with bolt-ons, or bone stock everything?Tracy
2002 C5 M6 Convertible
1994 Z28 M6 Convertible
Current Mods:
SLP Ultra-Z functional ramair, SS Spoiler, STB, SFCs, Headers, Clutch, Bilstein Shocks, and TB Airfoil. 17x9 SS rims with Goodyear tires, 160F T-Stat, MSD Blaster Coil, Taylor wires, Hurst billet shifter, Borla catback with QTP e-cutout, Tuned PCM, 1LE Swaybars, 1LE driveshaft, ES bushings, White gauges, C5 front brakes, !CAGS, Bose/Soundstream audio, CST leather interior, synthetic fluids
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I've heard that too...but I too have no proof...just someone's word on it. I could have sworn I heard Ken say that someone lost 4 hp, but I'm not sure if it was a switch from an bolt-on LT1 to a 58 mm TB, or a bone stock LT1 to a 52 mm TB.
94 Black T/A GT, Advanced Induction 355, 3200 stall, built 4L60E, Moser 9", Baer Brakes, Shooting for 11s...Comment
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There was an actuall Dyno run which proved that converting to a larger TB will cause you to lose HP. It was posted here a while back, but I dont remember the exact details on the car. I think Injuneer posted it, but Im not sure. Maybe he can remember. The car had a few mods already if I remember correctly, but nothing beyond minor bolt on's.1996 Arctic White Z28, A4, K&N CAI, TByrne MAF ends, BBK Twin-52mm TB, TB Bypass, SLP 1 3/4" Shorties, Richmond 3.42's, Dynomax Bullet Muffler W/Turn Down, BMR Adj. Panhard, EIBACH Pro-Kit, AFS ZR1 Wheels W/17x11" out back!
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The only actual dyno test I saw was for a 58mm throttle body on a relatively stock LT1. It lost 10HP, but it was a little bit subject to how you interpreted the dyno curves.... I wouldn't have interpreted it quite that way, but it definitely "lost" power, maybe only 3-5HP.
A also have a set of dyno sheets from a website that no longer exists, and they tested a bunch of popular boltons, on a mildly modified (300rwHP/320 lb-ft reTorque) 96 Z28. Some of the results:
52mm TB: +2.5HP, +3.2 lb-ft
Remove MAF screen: +1.1HP, -0.4 lb-ft
TB airfoil: +1.1HP, -1.90 lb-ft
MSD 6A/Accel Supercoil: +3.5HP, +4.7 lb-ft
HPP+: +3.0HP, +0.9 lb-ft
Most of those gains/losses are so small that they may just be the "normal" variances you are going to get from one pull to the next.Fred
381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motorComment
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I drove a basically stock LT1 with a 52mm and I didn't like the throttle resonse. The car felt really jumpy, not smooth in the power delivery and there was no gain in WOT performance. It was the part throttle performance that was really annoying. Much less linear, hard to give smooth throttle input, etc.
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