karkrazy1971

Any LT4 owners had their car on he dyno? I was curious how much power they actually make? The car pulls harder than I expected

Paul Workman

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?

Tom400CFI

I think most come in at around 310-315 RWHP. STOCK.

EDIT: Citing my source -scroll to the bottom to see the STOCK cars...

LT4 Dynos

PLRX

B17Crew

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

vader86

Motor was underrated by GM, maybe due to the LS1's comparable power numbers the next year. Typically they put down 310rwhp.

karkrazy1971

Those are some good numbers. I want to do some basic mods then compare stock to lightly modified.

Tom400CFI

Go put it on a dyno now, see what your baseline is, then do you mods...re test at the same shop.

karkrazy1971

That is exactly what I plan to do. Just have to resolve a hesitation problem first. Once that is done, I'm doing all the easy mods first.

rocco16

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.

l98tpi

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.

karkrazy1971

That's pretty cool. It's nice to see what this LT4 does stock and lightly modified.

Zix

Never did one when it was stock...

856SPEED

Nice!

Putting down a pile of beans at the wheels....

l98tpi

Awesome power. Mods: