750 csu blow thru bog help
08-30-2013, 11:10 PM
#1
Staging Lane
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750 csu blow thru bog help I have a 03 4.8 lsx, ls6 cam, 76mm turbo. csu 750cfm carb. 32 deg timing with a map sensor pulling it down to 20* at full boost. 72/78 jets. Regular power valve in the front and a boost reference power valve in the rear. I do have jet extensions. 7 psi fuel pressure that rises 1:1 with boost. My problem is when I'm doing a burnout the car does good for about 2sec then while the tires are spinning it wants to cut out and die. When I re start it it blows Black smoke everywhere and wants to miss and carry on till I clean it out a few times. Next I bring it up to line footbraking building about 2-3 pounds and when I leave it goes nowhere, best 60ft is 2.04 it's just bogging down, then at about the 330 it comes into boost and hauls ***. Ran a 8.02@102 in the 1/8 and 11.97@125 in the 1/4. Where do I need to start to fix the bog and get it to leave so I can get a good et not just mph.? Thanks.
08-31-2013, 08:02 AM
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Launching!
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Do you have and A/F gauge? What front power valve are you running. Also try more timing..
I have a 03 4.8 lsx, ls6 cam, 76mm turbo. csu 750cfm carb. 32 deg timing with a map sensor pulling it down to 20* at full boost. 72/78 jets. Regular power valve in the front and a boost reference power valve in the rear. I do have jet extensions. 7 psi fuel pressure that rises 1:1 with boost. My problem is when I'm doing a burnout the car does good for about 2sec then while the tires are spinning it wants to cut out and die. When I re start it it blows Black smoke everywhere and wants to miss and carry on till I clean it out a few times. Next I bring it up to line footbraking building about 2-3 pounds and when I leave it goes nowhere, best 60ft is 2.04 it's just bogging down, then at about the 330 it comes into boost and hauls ***. Ran a 8.02@102 in the 1/8 and 11.97@125 in the 1/4. Where do I need to start to fix the bog and get it to leave so I can get a good et not just mph.? Thanks.
