Ls1 AC cobra had a dyno power run

[GavCob]

Hello,
Got AC Cobra replica with ls1 and 224r cam, 241 heads and sidepipes. M6 stick
Did a power run today, a little dissapointed compared to those lovely US figures.
It was only a quick power run in 4th. I think more in it as HP still climbing.
Its a basline incase i single turbo gt45 it.
Regards
Gav

[Oldandslow]

Why's there a roller coaster bit in the middle?

[Boosted LS1]

Weren't ls1's rated at 350 hp and the ls6 at 400? I wouldn't be to disappointed as you'll get some more. I wouldn't want a turbo on it though unless you've got really good knock protection. The piston crowns are pretty weak when meeting detonation.

[Olas]

how do you plan to smooth out the curve? is it a reversion issue with the cam and inlet manifold?

lots of area under curve to be gained if you can sort it out.


Theyre typically a lot smoother, like this;
http://caresi.rezon.co/ls1-dyno-chart/

[GavCob]

Hi,
Wheel slip?
Also a few troubles getting it working...
I think the hp tq right ish though near top though could have carried on to 6300 limiter
2 knock sensors there and working though never logged on pull.
As said quick run though.
It pulls smooth on road to 6000 so must have been dyno
380ish to 420 max for 224 r cam in states. Suppose we could knock 30 to 50 off that in UK?
If i turbo will only run 4 to 8 psi.
Just wanted thoughts.
It has 90mmtb and LS2 intake which isnt quite as good as a ls6 intake from what ive read.
But wont be changing any of that if turbo fits in.
Car hasnt been weighed but est 1100 to 1200 kg.
Regards
Gav

[stevieturbo]

Whilst all power runs etc can be taken with a pinch of vodka...any run shaped like that, and actually sent out the door with a graph like that......really it's only fit for using instead of toilet roll when all the shops have run out from crazed lunatics buying it all.

I hope the RR operator had a damn good reason for leaving you with a graph like that ? There's no way wheelspin should have been an issue even on a bad RR.

So something is very wrong.

But overall....has the setup ever been tuned correctly for the combination of parts used ? If not, there would be no expectation for it to perform too well.

More importantly, how does it feel and drive on the road though ?

[GavCob]

Hi Steve,
Glad u posted.
It runs like a raped ape on wot. Will i get into trouble with friends of the earth for that?
Might be getting another cheap dyno power run in April in a group to compare against.
Not worth a full dyno tune yet as just needed some bsseline.
Regards
Gav

[GavCob]

Crap, reread that, glad others posted as well btw

[stevieturbo]

Ultimately as long as it performs well and is tuned safe....that's the main thing.

But the operator really should have given you a good explanation for a graph that shape, and the cause of it.

[300bhp/ton]

Wonder if a different rolling road is required. As others have said. The curve, well it ain’t a curve.

Also engine numbers are always complete BS. And unless you have defied physics you appear to have the worlds most efficient transmission... according to the numbers on the print.