4.8 + precision 7675 + 75shot = 144mph
10-13-2013, 10:41 PM
#1
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4.8 + precision 7675 + 75shot = 144mph Finally hit the track with my 4.8 gto.
Went 143.9mph at 4000+ D.A
E.t was horrible as I was having issues going extremely rich on the launch and it wouldnt start pulling till about the 100ft mark.
I will be getting it leaned out on the lower rpm and trying it again at the track.
Im sure it still has 1 more mph or so in it.
2008 4.8
Stock 799 heads
Ebay headstuds
Ls9 headgaskets
80lb injectors
E85
Built 65e.
3 walbros intank
16psi
75 wet shot.
Race weight @ 4000lbs
4000 D.A
Went 143.9mph at 4000+ D.A
E.t was horrible as I was having issues going extremely rich on the launch and it wouldnt start pulling till about the 100ft mark.
I will be getting it leaned out on the lower rpm and trying it again at the track.
Im sure it still has 1 more mph or so in it.
2008 4.8
Stock 799 heads
Ebay headstuds
Ls9 headgaskets
80lb injectors
E85
Built 65e.
3 walbros intank
16psi
75 wet shot.
Race weight @ 4000lbs
4000 D.A
10-14-2013, 03:43 AM
#4
NICE!
Let me ask you, what rpm are you spinning the motor? I put an ls9 cam in my 4.8 and it didn't seem to pick up. In fact it actually appears to have lost power under 6000 rpm. Did you do anything different to make it work?
Let me ask you, what rpm are you spinning the motor? I put an ls9 cam in my 4.8 and it didn't seem to pick up. In fact it actually appears to have lost power under 6000 rpm. Did you do anything different to make it work?
10-14-2013, 06:55 AM
#5
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Not sure what it converts to.
It shifts right around 6400rpm.
It shifts right around 6400rpm.
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10-14-2013, 04:47 PM
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I couldn't but LMAO at the casualness of the woman recording. "11.6 at 143." My reaction was "Holy ****!" Talk about some massive top end pull. Can't wait to see what kind of E.T. it's capable of. Congrats on the wicked MPH.
10-17-2013, 10:36 AM
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Thing is rollin. Question, are you making 16psi before the 75 shot or after? Nitrous should add boost on top of whatever your boost leveo is before spraying right?
