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Stock 4.8 802RWHP but valve float now

 
Old 04-04-2014, 06:46 AM
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Originally Posted by 71 chevy View Post
how are you figuring this?

my calc says

3.25 gear
29" tire
5800 rpm
122mph

is 26.25% slip
My post was misleading... I used my 1/4 times. I only have a 2 speed. I wasn’t turning 5800 in the 1/8th in hi-gear. I don't know my RPM at the 1/8th.

Also you had a few specs wrong.

I had a 3.10 gear
28" tire
And it was closer to 5900

Last edited by Forcefed86; 04-04-2014 at 08:36 AM.
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Old 04-05-2014, 05:16 PM
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I guess the 60 foot was a fluke. But it did get just a little faster
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Old 04-05-2014, 05:23 PM
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running good eather way its a good running car.
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Old 04-05-2014, 05:34 PM
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Originally Posted by TurboTerry87gn View Post

I guess the 60 foot was a fluke. But it did get just a little faster

Congrats on the new best. yeah, to get a 3900lb car to go 1.14 would take an
INSANE amount of power.
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Old 04-05-2014, 06:20 PM
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Old 04-05-2014, 06:26 PM
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id have to think it whould run 9.50-60 in the 1/4 anyways. what turbo you running .
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Old 04-05-2014, 06:43 PM
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Maybe I missed it, what year is the 4.8?
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Old 04-06-2014, 09:32 AM
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congrats on the new bests
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Old 04-06-2014, 01:01 PM
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Impressive..
What are you running for suspension?
springs?
control arms?
anti roll bar?
shocks?
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Old 04-06-2014, 01:31 PM
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It's an s475 borg Warner turbo
I don't know what year it is. I found it on Craigs list for 300 dollars delivered, put a turbo on it. I don't even know how to tell what year it is. I has 862 heads if I remember correctly. I did have to put upgraded valve springs because of valve float above 23 psi. Right now it's at 25-26 psi. I believe I'm out of waste gate spring so I will take the 10 psi springs out and put 15 psi springs in. That should put over 30 psi if the turbo will flow enough.
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Old 04-06-2014, 01:34 PM
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Edelbrock upper control arms, metco lowers, stock sway bar with an anti sway bar. Qa1 rear shocks, no front sway bar, comp engineering shocks up front, and drag springs up front.
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Old 04-06-2014, 01:40 PM
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Originally Posted by TurboTerry87gn View Post
Edelbrock upper control arms, metco lowers, stock sway bar with an anti sway bar. Qa1 rear shocks, no front sway bar, comp engineering shocks up front, and drag springs up front.
nice. and leaves flat as a pancake.
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Old 04-06-2014, 01:46 PM
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Thanks, it took along time to get the suspension to work. I wasted lots of money and I'm not done yet. I'm gonna switch over to TRZ parts. And double adjustable shocks all the way around to get ready for what's coming.
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Old 04-06-2014, 01:53 PM
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Originally Posted by TurboTerry87gn View Post
Thanks, it took along time to get the suspension to work. I wasted lots of money and I'm not done yet. I'm gonna switch over to TRZ parts. And double adjustable shocks all the way around to get ready for what's coming.
Well, fellow g body guy, I may have to pick your brain.
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Old 04-06-2014, 06:45 PM
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Sure.
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Old 04-08-2014, 09:22 AM
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i dont know if its been mentioned but what valve springs did you upgrade to?
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Old 04-08-2014, 10:18 AM
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Since you asked about 4.8 camshafts, there is a member on here named Dezlfreak that runs a custom grind of ours in his 4.8(it's actually 302 cubic inches as it's forged).

At 3400lbs race weight and on 15psi with a S475(should easily make 30psi on a 4.8) he went [email protected] IIRC 60' was 1.60+ and it was his first time with the combination at the track.
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Old 04-08-2014, 10:30 AM
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i wonder just how far off those numbers he is now. i'll bet it runs 9.60 @ 138-140 mph now. and thats running good for stock cam.
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Old 05-11-2014, 09:36 PM
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Originally Posted by TurboTerry87gn View Post
It's an s475 borg Warner turbo
I don't know what year it is. I found it on Craigs list for 300 dollars delivered, put a turbo on it. I don't even know how to tell what year it is. I has 862 heads if I remember correctly. I did have to put upgraded valve springs because of valve float above 23 psi. Right now it's at 25-26 psi. I believe I'm out of waste gate spring so I will take the 10 psi springs out and put 15 psi springs in. That should put over 30 psi if the turbo will flow enough.
How much rpm drop and what shift rpm? What rpm is it crossing the stripe at?
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Old 05-12-2014, 11:34 AM
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Ever measured back pressure? Yours is the 1.32AR t6 S475 with the 96mm exh wheel correct?

Just for grins I setup a back pressure gauge on my small T4 1.10AR 83mm S475. 2.8:1 back pressure ration at 21psi!
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