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AFR 225, FAST 90-90 on 402, Dyno #'s

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Old 08-07-2007, 09:48 PM
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Default AFR 225, FAST 90-90 on 402, Dyno #'s

W2W built the motor, which is built for nitrous. 402 iron block, Callies Racemaster crank, Howard rods, dome pistons. Cam is a 245-257 633-644 on a 114 ls. Stock LS1 Hyd lifters.

Heads are out of the box AFR 225, with the upgraded springs, and stock rockers. I had these heads flowed @ Livernois, and they flowed @ 324, very close to advertized #'s..

I had this done over a year ago, but ran into some unexpected health problems that sidelined me for most of the year last year. The car ran a 10.81 @ 126 150 60, on motor with a 3550 raceweight.

I had some tuning issues, and discovered that I had not put the right bolts on the intake valley cover, and when I removed the intake I discovered the small vacume line going to the intake, on the passenger side, was not connected, and I doubt that it fell off when I took the intake off. Anyway, I removed the intake and discovered oil around the ports. It was obviously not sealing properly, because of the improper valley cover bolts. I'm lucky that I did not crack the intake. This explained the foul smell when I hammered it.

With the intake off, I cleaned up the casting crap on the inside, and port matched the intake to the AFR 255's.

The #'s are through a T400, 12 bolt, custom chromemoly driveshaft, 28" (325) MT DR on the first dyno, and 30" (315) on this last dyno.

W2W Mustang dyno showed 415 HP @ 6300 RPM's, 367 TQ @ 4900 before I discovered the problems with the intake.

I just had a fresh tune and dyno done @ CARS in Waterford, MI. Where the new #'s are 459 HP @ 6500, 389 TQ @ 5300 with the AF set @ 12.7

I drove the car home 65 miles, and other then a few idle issues, the car feels great. New track times to come after I change out the seats, and put some padding on the new cage.

I think it would easily be a 500 to 525 HP RWHP car, in a 6 speed car.
Old 08-07-2007, 09:51 PM
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If it means anything, the convertor is a Neal Chance custom nitrous convertor.
Old 08-07-2007, 10:23 PM
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Glad you're finally back in business and healthy again.

I sure miss seeing you break ET records every weekend like you did a few years ago. Your new setup sounds lethal. Enjoy it.
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Old 08-08-2007, 07:22 AM
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I would throw it back on W2W's dyno to see the changes. Not a big fan of Seans work or facilities. Still, pretty stellar times.
Old 08-08-2007, 10:32 AM
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Good to hear you are back in business, numbers sound good.
Old 08-08-2007, 12:15 PM
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do you have your own wideband on the car as well?
Old 08-09-2007, 11:06 AM
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Originally Posted by WHPLASH
I would throw it back on W2W's dyno to see the changes. Not a big fan of Seans work or facilities. Still, pretty stellar times.
The problem with that is fitting it in with their schedule. I had a bad misss, that turned out to be tuning related, and I could not drive the car because of it. Rather than wait 2 months more, I decised to go to CARS. The car feels good, and as far as if there is really any difference, well the track times will tell. I'm working on the suspension, and will head to the track, after the Woodward cruise.

No, I dont have a wideband on the car. I'm waiting until I get the nitrous put back on the car before installing that.

I drove it around for about 4 hours yesterday, with only high idle issues, that will be corrected. It certainly "feels" better, and snappier throughout the powerband. I'll update on the track times, when they come.
Old 08-12-2007, 09:04 PM
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A couple of runs on the back roads with the G-Tech, show a 132 MPH, where I let out of it before the end.

Depending on the accuracy, that would be an increase of my previous best of 127, and the 126 that I ran most of the day last year.

That would be about in line with the 1 MPH per 10 HP theory. Might be able to drop down to a 10.40 or 10.50 ET.
Old 08-12-2007, 11:30 PM
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I need to get me another g tech. I had a lot of fun with mine. Good numbers man, glad to see you back in action.



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