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Heads/Cam/Stalled auto LS1 running 12.70's
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Posted: 10/17/07 11:47 AM
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My car ran 12.8 with headers and street tires ONLY automatic. I gained a tenth and gained 2 MPH and 60ft'd the SAME with 325 MT et streets and the same with 245 street tires. The car dead hooked but when you make no power how do you 60ft though. I had a set of ported heads 1st of this year and they started leaking. (made almost 420rwhp) Then I ran cam only and it ran fine then I swapped over to my new set of heads a few months ago and have been fighting this problem till now. I have no fuel its not there. The car is making like 330-340rwhp. I'm down almost 100rwhp. The tune in my car has PLENTY of fuel it should be so rich. It made almost 420rwhp through a yank pt4000 converter with the 1st set of heads now it has NO power.
Ive swapped pcm's, swapped injectors around on the car, checked fuel pressure at wot/idle (60psi). checked voltage at the fuel pump, checked voltage at the injector harnesses, changed fuel pump, fuel filter, done a compression test and all the cylinders were 173-175 psi ( I dont think the motor is bad b/c it turned slow immediately after a 2 day head swap). Also did a leakdown on the motor 2-3% leakage between cylinders and about 7psi of leakdown and that was in about 45 seconds. Swapped my Fast 90 Intake off to a LS6 intake thinking somthing was wrong internally...nothing. Also did a cylinder balance test through HP Tuners software and all 8 cylinders were 93-95%. Ive gone through 3 cans of starter fluid looking for vacuum leaks. Checked tps voltage, checked all grounds under the hood/under the car, changed o2 sensors, changed the alternator out thinking I had a voltage issue, changed tps, had the intake off 3 times in a week inspected it, changed gaskets. I've unplugged the front o2's to keep the car in open loop to see if the fuel would show up and rich pig rich...nope. I dont know anymore. Im having my 42# injectors sent off this week sometime some think my injectors are bad but I have fuel on cold starts and idling the plugs are drenched in fuel b/c of the rich tune but it just dissapears at wot leans out and makes NO power. I want to blame the heads but I can't b/c where is the fuel? Also on the #6 cylinder primary off my headers my primary temperature is 650 deg F idling!! Ive swapped injectors on that cylinder and the heat stays there. All the other primarys are about 260-270 idling. All my inj harnesess have about 13.8 volts idling and it goes up as the motor revs. Is there somewhere in these fast intakes you could have a HUGe vaccum leak that would not be able to be picked up by spraying from the top of the motor to get it to ramp up? Anyone on here have any suggestions?
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BADLS1
New User
| Posts: 3
| Joined: 10/07
Posted: 10/25/07 06:13 AM
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Umm i think you might be over thinking this one... Who tuned it? How are you verifying the illegid lean condition @ WOT? Sounds like a really wacked tune to me that has some major veriables out of place like injector IFR's or something were never set right for the current injectors etc...
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deadmanTA
New User
| Posts: 6
| Joined: 03/08
Posted: 03/02/08 01:51 PM
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Could be the injectors, but really sound like a tuning issue if everything checks out ok.
99 TA A4 BGM--LS6,vic jr,317 heads,4K stall,turbo
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Posted: 10/01/09 03:46 PM
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I know this thread is really old but did you check the length of the pushrods when you got the new heads?
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