Dyno numbers for LT4?
Le Mans Master
Joined: Oct 2004
Posts: 6,314
Likes: 508
From: South-central Missouri
I'll see if I can find the link that one of the sponsors, a pro tuner, posted. But, IIRC, the apex of the bell curve (dozens of LT4s) was closer to 350 hp (derived by unknown correction for drivetrain losses) with one as low as 320 and a couple crowding the 375 hp.
It wouldn't be the first time GM understated engine performance for whatever reason, and it certainly would not bode well if the outgoing 96 C4s were at parity with the new LS1s (which they were, apparently).
The fact that the article quoted performances calculated from inertia dyno results is one place where results could be skewed considerably, depending on driveline loss assumptions.
Anywayz... This topic is always good for some lively discussion.
The way to know is to put yours on the dyno and see what is what! No?
It wouldn't be the first time GM understated engine performance for whatever reason, and it certainly would not bode well if the outgoing 96 C4s were at parity with the new LS1s (which they were, apparently).
The fact that the article quoted performances calculated from inertia dyno results is one place where results could be skewed considerably, depending on driveline loss assumptions.
Anywayz... This topic is always good for some lively discussion.
The way to know is to put yours on the dyno and see what is what! No?
Last edited by Paul Workman; Aug 19, 2014 at 11:32 AM.
Pro
Joined: Jun 2008
Posts: 696
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From: Columbus, OH
Never had mine on the dyno. Where I did see evidence of the LT4s improvements in real world numbers was at the track.
Out of the box, it ran four-tenths of a second & six mph faster than the ’94 6-speed LT1 I traded in for the 4.
Still wasn't fast enough to beat the ’04 C5 Z06 in the lane next to me though. Guy picked up his Z06 at the Museum, stopped at the strip on his way home from Bowling Green, ran 12.5 @ 111 on his first run. Ah, the good ’ol days.
B17Crew
Out of the box, it ran four-tenths of a second & six mph faster than the ’94 6-speed LT1 I traded in for the 4.
Still wasn't fast enough to beat the ’04 C5 Z06 in the lane next to me though. Guy picked up his Z06 at the Museum, stopped at the strip on his way home from Bowling Green, ran 12.5 @ 111 on his first run. Ah, the good ’ol days.
B17Crew
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Motor was underrated by GM, maybe due to the LS1's comparable power numbers the next year. Typically they put down 310rwhp.
Team Owner
Joined: Aug 2004
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From: Park City Utah
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
One morning some years ago, a friend with a one-year old C5 (345hp/MN6) and I put our cars on a chassis dyno. His peaked at 314rwhp. Mine at 311rwhp. Both engines were stock.
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I just dyno'd mine almost two weeks ago. Here is the dyno chart- 328rwhp/ 340rwtrq. Mods are just LT4 HotCam and LT Headers with Corsa Exhaust.
Attachment 47821123
Attachment 47821123
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