Tweet
Dyno results are in
Spent 7.5 hours tuning my car today. Most of it was getting the A/F mixture corrected while naturally aspirated. I was running 10.4:1!! :eek: I have no clue how it got that rich, but he leaned it back to a nice 12.9:1.
When we finally started in on nitrous runs it got ugly. First of all my window switch was messed up and not working properly so we disconnected that and just armed the nitrous toggle at WOT and above 3000 rpms instead. Problem was that everytime I hit the nitrous, the car stalled completely, it just f'ing quit!!
He just wanted to make sure nothing was clogged in the lines and that it was flowing properly so we pulled the fan nozzle from the intake and pointed it away from the car and hit it manually from under the hood and once again...the car imediately bogged and died. No nitrous sprayed into motor at all.
We tried one more time with the fan nozzle back in place into the intake and the same results happened. After that the SES light came on and P300 code came up...'Random Multiple Misfire'. We cleared it but it came back on my way to work, I cleared it again (I have an Auto X-Ray code reader) and it came back again on my way home, this tells me my plugs are fouled as he11. It was running way too rich again. The computer showed it was running over 100 psi of fuel pressure when under nitrous conditions (the machine doesnt read any higher).
He has tuned a TON of cars with nitrous and had a couple of his own cars with nitrous, but he had no idea what was going on.
Why is it running so dam rich? When the nitrous is hit and not spraying into the motor, why is it sill stalling the car?
The only thing I could think of was that my fuel pressure regulator is messed up. Other than that, I have no flipping clue.
Any thoughts?
BTW, I was running a 75 shot. Car's mods: CAI, headers, 3" cat, 3" exhaust, 160* thermo, Walbro 255lph fuel pump, 93 octane fuel, TR6 plugs
When we finally started in on nitrous runs it got ugly. First of all my window switch was messed up and not working properly so we disconnected that and just armed the nitrous toggle at WOT and above 3000 rpms instead. Problem was that everytime I hit the nitrous, the car stalled completely, it just f'ing quit!!
He just wanted to make sure nothing was clogged in the lines and that it was flowing properly so we pulled the fan nozzle from the intake and pointed it away from the car and hit it manually from under the hood and once again...the car imediately bogged and died. No nitrous sprayed into motor at all.
We tried one more time with the fan nozzle back in place into the intake and the same results happened. After that the SES light came on and P300 code came up...'Random Multiple Misfire'. We cleared it but it came back on my way to work, I cleared it again (I have an Auto X-Ray code reader) and it came back again on my way home, this tells me my plugs are fouled as he11. It was running way too rich again. The computer showed it was running over 100 psi of fuel pressure when under nitrous conditions (the machine doesnt read any higher).
He has tuned a TON of cars with nitrous and had a couple of his own cars with nitrous, but he had no idea what was going on.
Why is it running so dam rich? When the nitrous is hit and not spraying into the motor, why is it sill stalling the car?
The only thing I could think of was that my fuel pressure regulator is messed up. Other than that, I have no flipping clue.
Any thoughts?
BTW, I was running a 75 shot. Car's mods: CAI, headers, 3" cat, 3" exhaust, 160* thermo, Walbro 255lph fuel pump, 93 octane fuel, TR6 plugs
Comment