I'm very curious what the curve looks like. Thanks, Chuck ------------------ 87 Formula 350 13.94@96.67 98 Z28 1LE 13.15@107.59 1LE Owners Association

'91 Z-28 best ET=13.24 MPH=107.18

Dynoed 278 HP 335 TQ to the RW
@4800 @3400

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Chronologically challenged. But still kicking!
'92 CAMARO RS
305 TBI 5/spd (now TPI)
B4C Alt.
'69 camaro-BB/Lenco,1050 dominators, /Pump Gas/no drugs 8.97-150+/3200lbs.
SoCal Thirdgen F-Bodies

Dyno Don wrote:

Dynoed 278 HP
335 TQ to the RW @4800 @3400

Wow! - where did the 77 HP and 70 Ft Lbs of torque go?

GM puts this engine at 355 HP @5500 RPM, 405 Ft #'s of torque @ 3500 RPM. I am hoping that this is with a totally stock intake/plenum/runner setup, and a stock chip right?
Do TPI systems really lose that much power over a carb?

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89 Firebird Formula
WS6 package,ZZ4 Crate engine
SLP 58MM TB, Edelbrock TES Headers
Random Tech 3" cat, SLP 3" stainless exhaust
9 bolt rear, Hotchiss swing arms, Lakewood panhard rod
Corvette 2/4 servo, kevlar band, full poly rear.
Centerline 16x8 rims, B.F Goodrich drag radials

oops, hit it twice

[This message has been edited by Desert86Roc (edited March 05, 2001).]

Sounds like a major tuning/chip problem.... I know people running 12's with the ZZ4 & a stock TPI base, ported plenum, with 24# injectors & a 58mm TB.

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Mike Metzler (Desert86Roc)
Mike@SpeedworldMotorplex.com
[*] Webmaster: SpeedWorldMotorplex.com[*] Click Here For My Racing Page[*]86 IROC 305 TPI (406 build in progress)
ET's @ 1250 ft[*] 14.28 @ 95.461 mph (uncorrected, NOS, no headers)[*] 15.365 @ 86.785 mph (uncorrected, Headers, no NOS)

I believe he stated those numbers were from the rear wheels. The dyno numbers are consistant with TPI ZZ4 setups. Don't forget there is a %20 loss at the rear wheels.

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Hybrid Black 5.7L 5 Speed
'95 Competition Yellow Corvette Coupe ZF6

Actualy dad, those arent the right numbers.

It was 280 HP and 380 TQ at the rear wheels. The ZZ4 is rated at 355 HP and 400 TQ at the engine, not at the wheels.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

How does that output compare to a carb setup. I know the torque is down with a carb but I heard the HP compared to a stock TPI intake makes up for it and the two combos actually run virtually the same ET (TPI usually a little quicker) but with a 2-3mph trap speed difference favoring the carb?

The car on the right "211" Claims that this is the first run he made when he tossed all of his TPI goods on a ZZ4 engine. the webpage for the above picture and more information is at

http://www.cis.udel.edu/~davis/z28/zz4/

hope i helped a little

I don't know about you all, but I would be disappointed with a 13.61@99 for a ZZ4. I'm sure it got faster after some bugs were worked out. I don't know about this combo running 12's either, but I would like to think it's possible.

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87 Formula 350 13.94@96.67
98 Z28 1LE 13.15@107.59
1LE Owners Association

Well, GMPP did 13.8 @ 99 in their ZZ4 swapped 87 Camaro, with the ZZ4 conversion kit. I did 13.25 @ 107 with TPI, but if I could drive better, and get a 60' under 2.0, it could have been 12's.

http://www.thirdgen.org/messgboard/F...ML/000986.html

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
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