254 rwhp @ 5500rpm
274 torque @ 3750rpm

 

hrmmm
With 15% loss...figures out to be 292hp. Guess its not overrated as everyone here has hoped for.
Didnt LS1's come close to dynoing 300 at the wheels? This is a little low IMO. How much break in time did it have?

 

Its also on a mustang dyno.

 

Hmm... was that 3550 weight with a driver in the car or just the car?

 

i'm sorry, but that's kind of laughable. i was expecting closer to the 270-280hp range with all the rumors of it being underrated by 20hp. actually if you think about it, 254rwhp/.85 ~300hp crank, which is the advertised power rating. i'm disappointed it ONLY puts out it's rated power. have we become so jaded?

 

The car itself. It's about 100lbs heavier than a F-bod.

Yes, it's a Mustang dyno. It would be 270ish on a dynojet I imagine.

Better than the 04' GT, but it's still no LS1.

 

 

dont lt1's do better on average? it doesnt matter anyway, ill have a cam by the time i ever see one of these on the road

 

i call ugly on that one.

 

LT1's don't generally dyno that high in stock trim. I think the M6's could see 240-245RWHP, MAYBE some with 250RWHP. But, there are exceptions. I bet with proper break in those numbers would be a bit higher for the 'stang. None the less, I'm still a bit surprised at the numbers.

 

Another thing, it's a mustang dyno which usually reads lower. I haven't heard of any stock Lt-1's dyno'ing 254rwhp on a mustang dyno.

Interesting numbers nonetheles. Still not Ls1 caliber, but i'm interested in seeing what this manual will run.

 

LT1's usually dyno 250-265 for an M6, I have even heard of a few that were north of 270 but that is not the norm. Torque is about 290-300. Early LS1's dynoed about 290-305 and the later ones were about 310-325 so they were plenty stout. As pointed out, if it is a Mustang dyno then the numbers are too low so does 270 sound right for a comparable Dynojet run? That weight is pretty heavy. I was under the impression that it was going to be 34xx pounds. I would like to see more of these dynoed so we can get some sort of consensus.

 

And people here were worried a 5.3L in the Camaro wouldn't be enough to stay ahead of the Mustang GT.

 

I'd rather have an LS7 myself. Or atleast an LS2 or 3.

 

This is pretty funny, because the dyno sheet clearly shows it was on a Mustang Dyno. Because of the eddy current motor that simulates load, the results on a Mustang Dyno will be lower.
Stock ‘03/’04 Cobras usually dyno in the 330rwhp range on a Mustang Dyno, and 360+rwhp on a Dynojet.
This link explains the difference between a Mustang Dyno and a Dynojet. Pretty simple…the Mustang Dyno uses an eddy current motor that simulates load as the car is accelerated.
Chevy High Performance did a Mustang Dyno and Dynojet comparison, which clearly illustrated the differences.
This is an interesting link. It shows a Mustang Dyno sheet for a Mach I and compares the same car on a Dynojet.
An LS1 owner in this thread made 274rwhp on a Mustang Dyno.

This thread clearly illustrates the differences between a Mustang Dyno and a Dynojet.

Numerous examples of LS1’s on a Mustang Dyno.
Seems like most stock LS1's dyno around 270-280rwhp on a Mustang Dyno, which would put an LS1 about 20-30rwhp higher than the new Mustang GT.
Those look like some pretty damn good results to me. It's hard to exactly convert to Dynojet numbers, but the general concensus seems to be around 8-10%. The best way would be to put the car on a Dynojet and make a pull. I'd bet around 270-280rwhp SAE corrected.
S.