20-COBRA-03
Banned
Hey guys... i have been experiencing what i assumed was spark blowout, after i got my car 'tuned' at a local shop. I brought the car to them with NGK BR7EF's gapped at .030 to.032... For some reason, he said they were not working too well with my setup, and insisted that I put NGK TR-6's back in at .032... He tuned the car like that, and i had a constant problem since it came off of the dyno (yes, it was a loaded MD). The AFR was close to where it should be, but i had another problem. Almost every single time i tried to stay in it at full load, the car would break up something fierce. It would always happen around 4500-4700rpm's or so. I tried to throw more fuel at it up top, and it still broke up. I took my WeaponX coils out and tried swapping my stock coil packs back in, problem persisted.
I finally got around to addressing a few things that i wanted to fix. I ended up ditching my 4in charge pipe, in favor of a 3in pipe... as the 4in was probably skewing my MAF quite a bit. I also got rid of my little odyssey battery and threw a big optima in, out back ofcourse... the only place i had room. I also took the time to change the shit TR-6's out. I pulled them out, and although I had gapped them at .032 when they went in... some how they were between .038 and .042 when i pulled them out?!?!? I did some reading, and opted for the Autolite AR94's. I gapped them at .028 to start. I put them in, leaving the WeaponX coils in place. I did a couple of quick pulls, noticed that the AFR was leaning quite a bit up top. I then threw a bit more fuel at it, in small intervals... until i got it close, before i romped on it. I ended up seeing 11.8-11.7's up top, damn close to what i have the fueling tables calling for, so i left it there for now.
So, after i got the fueling safe, i ripped it through a couple gears... and made a couple pulls. I am sure that i pulled it well above 4700rpm's... and the car didn't miss a beat. It didn't break up at all, no spark blowout, no signs of detonation... etc. I was ecstatic to be able to stay in it, with out the car breaking up. My only concern is that the weather being cold (maybe 20deg), may have been responsible for the car running cleaner than before, but i hope that is not the case. I'm sure that if the problem was not resolved, the car would still break up, even in the freezing cold. Any input would be appreciated! -Bob
BTW, a quick run down on the car...
Single turbo, Stock longblock, TH400, VMP slot meter from Justin, 3in charge pipe, Sullivan intake, about 14lbs. boost on the gate, WeaponX, Autolite AR94's, Stock ECU, Tuning with Sniper...
I finally got around to addressing a few things that i wanted to fix. I ended up ditching my 4in charge pipe, in favor of a 3in pipe... as the 4in was probably skewing my MAF quite a bit. I also got rid of my little odyssey battery and threw a big optima in, out back ofcourse... the only place i had room. I also took the time to change the shit TR-6's out. I pulled them out, and although I had gapped them at .032 when they went in... some how they were between .038 and .042 when i pulled them out?!?!? I did some reading, and opted for the Autolite AR94's. I gapped them at .028 to start. I put them in, leaving the WeaponX coils in place. I did a couple of quick pulls, noticed that the AFR was leaning quite a bit up top. I then threw a bit more fuel at it, in small intervals... until i got it close, before i romped on it. I ended up seeing 11.8-11.7's up top, damn close to what i have the fueling tables calling for, so i left it there for now.
So, after i got the fueling safe, i ripped it through a couple gears... and made a couple pulls. I am sure that i pulled it well above 4700rpm's... and the car didn't miss a beat. It didn't break up at all, no spark blowout, no signs of detonation... etc. I was ecstatic to be able to stay in it, with out the car breaking up. My only concern is that the weather being cold (maybe 20deg), may have been responsible for the car running cleaner than before, but i hope that is not the case. I'm sure that if the problem was not resolved, the car would still break up, even in the freezing cold. Any input would be appreciated! -Bob
BTW, a quick run down on the car...
Single turbo, Stock longblock, TH400, VMP slot meter from Justin, 3in charge pipe, Sullivan intake, about 14lbs. boost on the gate, WeaponX, Autolite AR94's, Stock ECU, Tuning with Sniper...
