More 346" ET 240cc 11 degree progress - 10.7 @ 131 N/A 2500'
#1
More 346" ET 240cc 11 degree progress - 10.7 @ 131 N/A 2500'
Today we went to do alittle test and tune in the heat. Our only swap this time was the American Racing Long tubes. The new long tubes are much closer to equal length which yeilds more consistent A/F from cylinder to cylinder. One thing to note is we're not launching the car yet so the 60's are slow but consistent.
Test:
Old Long tubes -> American Racing Long tubes
Inital:
1850' DA
10.9 @ 129
Shift 7400
A/F avg: 12.5
Timing: 24 deg
After Header Swap ONLY
2500' DA
10.7 @ 131(calculated 2.2MPH gain in worse weather)
Shift 7400
A/F avg: 12.5
Timing 24 degrees
The run was pretty smooth, we left very easy the car 60' was 1.69 and terminated the run with a very pleasing 10.7 @ 131 in the middle of the heat today.
Test:
Old Long tubes -> American Racing Long tubes
Inital:
1850' DA
10.9 @ 129
Shift 7400
A/F avg: 12.5
Timing: 24 deg
After Header Swap ONLY
2500' DA
10.7 @ 131(calculated 2.2MPH gain in worse weather)
Shift 7400
A/F avg: 12.5
Timing 24 degrees
The run was pretty smooth, we left very easy the car 60' was 1.69 and terminated the run with a very pleasing 10.7 @ 131 in the middle of the heat today.
#4
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Phil
Are you saying that the old headers were 1 3/4 and the new are 1 7/8?
Or are both step header from 1 3/4 to 1 7/8?
I think from a + 2,500DA with 131 MPH to -2,000DA you could see 137mph.
Bob
Are you saying that the old headers were 1 3/4 and the new are 1 7/8?
Or are both step header from 1 3/4 to 1 7/8?
I think from a + 2,500DA with 131 MPH to -2,000DA you could see 137mph.
Bob
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#11
TECH Junkie
iTrader: (28)
Congrats on the great times.
What is the compression ratio and weight with driver?
I went nearly 128mph n/a with 10.7:1 compression, milled .024" AFR 205's, TSP 233/239 .600 112LSA cam, LS6 intake, ported TB, MAF tune, UD pulley, 1 7/8" headers thru dual 3" cats/Xpipe/muffs. I was 2950lbs with driver. That was in January with 50* temps and great DA I imagine. In 90* heat it runs 125-126 mphish.
With nitrous that Vette will fly.
What is the compression ratio and weight with driver?
I went nearly 128mph n/a with 10.7:1 compression, milled .024" AFR 205's, TSP 233/239 .600 112LSA cam, LS6 intake, ported TB, MAF tune, UD pulley, 1 7/8" headers thru dual 3" cats/Xpipe/muffs. I was 2950lbs with driver. That was in January with 50* temps and great DA I imagine. In 90* heat it runs 125-126 mphish.
With nitrous that Vette will fly.