648whp on Pumpgas
MERRY CHRISTMAS EVERYONE!
My setup was making 620 at 30 psi pump 93 only,6235, with no issues. I also had wide rims and wide tires. If I had stock wheels. I would of made 640 whp. 
Last edited by bigturboevo80; Dec 25, 2010 at 01:12 PM.
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
Thread Starter
Joined: Jan 2004
Posts: 11,406
Likes: 78
From: Northwest
I didnt notice any change from pulling the 9.5s and 275s off, I doubt the extra 10mm would matter. At the same time the 285/30 is also almost and inch shorter so by that reasoning there should be more thrust at the contact patch. In practical measurement on a dynojet that isnt seen unless the alignment is WAY off. Even then it seems to just shred the tire and still make great power.
My car with 18x9.5s and 275s made 574whp at 29psi, the clone of my car made 576whp on 245 R comps on 8.5" wheels at the same boost level. I'd add the 2whp difference up to atmospheric variations. It would be an interesting test though, go find some narrow tires and prove me wrong.
Last edited by JohnBradley; Dec 25, 2010 at 09:54 PM.
Actually it would be 28whp, right? You havent made 640 yet unless I misunderstood your post.
I didnt notice any change from pulling the 9.5s and 275s off, I doubt the extra 10mm would matter. At the same time the 285/30 is also almost and inch shorter so by that reasoning there should be more thrust at the contact patch. In practical measurement on a dynojet that isnt seen unless the alignment is WAY off. Even then it seems to just shred the tire and still make great power.
My car with 18x9.5s and 275s made 574whp at 29psi, the clone of my car made 576whp on 245 R comps on 8.5" wheels at the same boost level. I'd add the 2whp difference up to atmospheric variations. It would be an interesting test though, go find some narrow tires and prove me wrong.
I didnt notice any change from pulling the 9.5s and 275s off, I doubt the extra 10mm would matter. At the same time the 285/30 is also almost and inch shorter so by that reasoning there should be more thrust at the contact patch. In practical measurement on a dynojet that isnt seen unless the alignment is WAY off. Even then it seems to just shred the tire and still make great power.
My car with 18x9.5s and 275s made 574whp at 29psi, the clone of my car made 576whp on 245 R comps on 8.5" wheels at the same boost level. I'd add the 2whp difference up to atmospheric variations. It would be an interesting test though, go find some narrow tires and prove me wrong.
We could of thrown some more timing at the car in the upper rpms, and or we could of went with light 18x9.0 rims and 265 tires. And could of made 648. But the tuner and i kept the power down for dd reliability.