dmann
New member
- Joined
- Apr 22, 2015
- Location
- Sacramento CA
1987 760 turbo, 3 inch cat back exhaust, bosch 044 fuel pump upgrade, new in tank pump, manual boost controller.
I was running around 13 or 14 lbs of boost on that run and it felt pretty good. I upped the boost more, like around 17 or 18 lbs and I got severe wheel spin off the line and then a flat feeling top end rush. My mph went down to 84 though I did spin all of first and second. On the higher boost setting I had very audible ping in first gear.
I'm running 91 octane fuel. My wideband shows around 10 or 11 to 1 AFR at 10PSI boost and it starts going up after 10 PSI. By 17PSI I'm at around 12 to 1 AFR.
My engine internally is stock as far as I know, as is my LH 2.2 and my ignition system. I'm running NGK 7 something plugs and the slightly lower temp thermostat. Stock air filter element but the thermostat is forced closed in the airbox and the little silencer is gone. I did the accumulator mod to the transmission.
The best run of the night was 15.29 @88 MPH in Northern California near sea level @ about 73 degrees F. This was at about 13 or 14 PSI boost.
I can't really run any more boost without risking detonation on this combination.
What's the next logical step to go faster? I don't want to pull the head off right now if I don't need to, but I guess I could if that had to be the next step.
I really was hoping to get into the 13s on this basic motor.
Dan
I was running around 13 or 14 lbs of boost on that run and it felt pretty good. I upped the boost more, like around 17 or 18 lbs and I got severe wheel spin off the line and then a flat feeling top end rush. My mph went down to 84 though I did spin all of first and second. On the higher boost setting I had very audible ping in first gear.
I'm running 91 octane fuel. My wideband shows around 10 or 11 to 1 AFR at 10PSI boost and it starts going up after 10 PSI. By 17PSI I'm at around 12 to 1 AFR.
My engine internally is stock as far as I know, as is my LH 2.2 and my ignition system. I'm running NGK 7 something plugs and the slightly lower temp thermostat. Stock air filter element but the thermostat is forced closed in the airbox and the little silencer is gone. I did the accumulator mod to the transmission.
The best run of the night was 15.29 @88 MPH in Northern California near sea level @ about 73 degrees F. This was at about 13 or 14 PSI boost.
I can't really run any more boost without risking detonation on this combination.
What's the next logical step to go faster? I don't want to pull the head off right now if I don't need to, but I guess I could if that had to be the next step.
I really was hoping to get into the 13s on this basic motor.
Dan