at 10 psi, on a supercharger or turbo, what is needed?
from what I gather
Intercooler
bigger injectors
some form of fuel management
would I need a bigger fuel pump? ARP studs/new head gasket? would a rising rate fuel pressure regulator work for supplying fuel?
Its not that high of a number, and I was wondering if I can get away with just these things.
10 psi, whats needed?
I ran 18psi non intercooled on 94 octane in 25F temps. Same day car went 109mph in the 1/4. Dec of 2003.russc wrote:Thats on 93 octane, right? On 91, you may not be able to run 10psi non-IC.Tjn182 wrote:you don't even need the IC -- i've been doing 10psi for 2 years w/o an IC until just recently.
RussC
Todd
Right,T_C_D wrote:I ran 18psi non intercooled on 94 octane in 25F temps. Same day car went 109mph in the 1/4. Dec of 2003.russc wrote:Thats on 93 octane, right? On 91, you may not be able to run 10psi non-IC.Tjn182 wrote:you don't even need the IC -- i've been doing 10psi for 2 years w/o an IC until just recently.
RussC
Todd
That was the magic engine car. Others will vary and will need some IC'ing to do that.
RussC
What was the elapsed time?T_C_D wrote:I ran 18psi non intercooled on 94 octane in 25F temps. Same day car went 109mph in the 1/4. Dec of 2003.russc wrote:Thats on 93 octane, right? On 91, you may not be able to run 10psi non-IC.Tjn182 wrote:you don't even need the IC -- i've been doing 10psi for 2 years w/o an IC until just recently.
RussC
Todd
Off his site:M635CSi wrote:What was the elapsed time?T_C_D wrote:I ran 18psi non intercooled on 94 octane in 25F temps. Same day car went 109mph in the 1/4. Dec of 2003.russc wrote:Thats on 93 octane, right? On 91, you may not be able to run 10psi non-IC.Tjn182 wrote:you don't even need the IC -- i've been doing 10psi for 2 years w/o an IC until just recently.
RussC
Todd
60' 2.327
330 6.058
1/8 9.023
MPH 84.28
990 11.447
1/4 13.577
MPH 108.96
I run 10psi non-intercooled with a fairly large safety margin. Never pings or knocks, even at full boost on a very hot day after being stuck in traffic.russc wrote: Right,
That was the magic engine car. Others will vary and will need some IC'ing to do that.
RussC
All that's needed to accomplish this is non-cali-craptacular formula 93 octane fuel.
I would highly recomend an oil cooler though.
Jeremy
i ran 10 psi non intercooled with 91 octane for while with no detonation.
I had it at 14-15 psi (got sent wrong spring) non-intercooled for the first 2 weeks after I turbo'd my car.
It felt realy fast(especially before I got the exhaust put on), but had slight detonation at peak torque every once in a while in the Higher gears(3rd,4th,5th). At the time I also was running out of fuel, not being able to keep it very rich, was jumping past 110% duty cycle.
I think if I could have retarded the timing and had enough fuel, I could have ran 14-15 psi non-intercooled with no detonation on 91.
I had it at 14-15 psi (got sent wrong spring) non-intercooled for the first 2 weeks after I turbo'd my car.
It felt realy fast(especially before I got the exhaust put on), but had slight detonation at peak torque every once in a while in the Higher gears(3rd,4th,5th). At the time I also was running out of fuel, not being able to keep it very rich, was jumping past 110% duty cycle.
I think if I could have retarded the timing and had enough fuel, I could have ran 14-15 psi non-intercooled with no detonation on 91.
Ooooh yeah an oil cooler. Man... you gotta have one of those.Jeremy wrote:I run 10psi non-intercooled with a fairly large safety margin. Never pings or knocks, even at full boost on a very hot day after being stuck in traffic.russc wrote: Right,
That was the magic engine car. Others will vary and will need some IC'ing to do that.
RussC
All that's needed to accomplish this is non-cali-craptacular formula 93 octane fuel.
I would highly recomend an oil cooler though.
Jeremy
Mmm,90e34535i wrote:i ran 10 psi non intercooled with 91 octane for while with no detonation.
I had it at 14-15 psi (got sent wrong spring) non-intercooled for the first 2 weeks after I turbo'd my car.
It felt realy fast(especially before I got the exhaust put on), but had slight detonation at peak torque every once in a while in the Higher gears(3rd,4th,5th). At the time I also was running out of fuel, not being able to keep it very rich, was jumping past 110% duty cycle.
I think if I could have retarded the timing and had enough fuel, I could have ran 14-15 psi non-intercooled with no detonation on 91.
My current M30b35 will TCD chip only runs to ~8-9psi on Chevron 91 here in the SF Bat Area. After that its major pre-det.
Am I missing somthing?
RussC
You're running rich even in cruise, could be carbon build-up. Lots of variables to consider like fuel quality, casting imperfections, timing, etc.russc wrote:Mmm,90e34535i wrote:i ran 10 psi non intercooled with 91 octane for while with no detonation.
I had it at 14-15 psi (got sent wrong spring) non-intercooled for the first 2 weeks after I turbo'd my car.
It felt realy fast(especially before I got the exhaust put on), but had slight detonation at peak torque every once in a while in the Higher gears(3rd,4th,5th). At the time I also was running out of fuel, not being able to keep it very rich, was jumping past 110% duty cycle.
I think if I could have retarded the timing and had enough fuel, I could have ran 14-15 psi non-intercooled with no detonation on 91.
My current M30b35 will TCD chip only runs to ~8-9psi on Chevron 91 here in the SF Bat Area. After that its major pre-det.
Am I missing somthing?
RussC
Ya,
Its runs rich, but not horribly rich. There is probably differences in the turbo package. The TCD manifold/turbo are most likely more efficient than the old Dinan package. That can lower temps a bit!
And, I never checked the condition of this engine on install. Who knows whats in there. But it did make 325whp, so it can't be that bad.
RussC
Its runs rich, but not horribly rich. There is probably differences in the turbo package. The TCD manifold/turbo are most likely more efficient than the old Dinan package. That can lower temps a bit!
And, I never checked the condition of this engine on install. Who knows whats in there. But it did make 325whp, so it can't be that bad.
RussC
Its not that simple. The ECU is runing closed loop. It should adjust inj duty cycle to compensate for lower pressure. Its somthing that may have to get fixed by other means. Not sure what those means are yet.M3fan4eva wrote:What about adjusting the fuel pressure? Would that solve your problem?
RussC