Houston, we have a big problem

[SCBQQSTN]

My sister just bought a 97 procharged stage II intercooled P1-SC cobra.

She showed me the dyno numbers that the previous owner gave her, 369 rwhp and 365 rwtq..... what the hell is wrong with this picture?

She said the previous owner she bought the car from did not bother to change the gapping on the stock spark plugs and did the dyno pull with the stock plugs. The a/f is not linear at all, its all over the place.

He changed the plugs to NGK-TR6 with the proper gapping but did not get it retuned. He said it ran a lot better with the proper plugs.

Before I take it to get retuned is there ANYTHING I should be aware of? Or is the stock sparks plugs responsible for the low dyno numbers?

The current pulley setup is for 6 psi

 

[y2k2gt]

Stock the car only made about 260rwhp, so the 369rw at 6psi sounds right.

 

[SCBQQSTN]

Stock the car only made about 260rwhp, so the 369rw at 6psi sounds right.

Really? I thought the normal hp range for these cars at 6 psi is 420 at the wheels no?

 

[y2k2gt]

To make 420rw the car would need 300rw n/a. They were rated at 305fwhp.

 

[98 Saleen Cobra]

420rwhp is more like 8-9psi.. and a good amount of timing.. it could be a very conservative tune.

 

[Sammyboy]

Sounds about right to me. Still 365rwtq is nothing to be ashamed of....

 

[SCBQQSTN]

So does it even need a retune??

 

[2V99GT]

Really? I thought the normal hp range for these cars at 6 psi is 420 at the wheels no?

not really. 6 lbs of boost isn't much. also, the plugs being stock and not gapped correctly would make a difference in power for sure.

for reference, my car with the stock longblock made 440/400 on 9lbs of boost through the P1, with longtubes.

 

[y2k2gt]

So does it even need a retune??

It wouldn't hurt to do a pull on the dyno to check the tune and a/f. That should be less than $100 for 3 pulls.

 

[flowgoode]

if you say the a/f is all over the place it is definately a good idea to get it retuned, or dyno'd to check the a/f on a wideband atleast.

I made about 430rwhp on 10psi and like 14degrees timing on my stock motor.