MyE28.com

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.

All yo need are:
1) 30lb injs
2) RRFPR
3) IC

RussC

you don't even need the IC -- i've been doing 10psi for 2 years w/o an IC until just recently.

Tjn182 wrote:you don't even need the IC -- i've been doing 10psi for 2 years w/o an IC until just recently.

Thats on 93 octane, right? On 91, you may not be able to run 10psi non-IC.

RussC

russc wrote:

Tjn182 wrote:you don't even need the IC -- i've been doing 10psi for 2 years w/o an IC until just recently.

Thats on 93 octane, right? On 91, you may not be able to run 10psi non-IC.

RussC

I ran 18psi non intercooled on 94 octane in 25F temps. Same day car went 109mph in the 1/4. Dec of 2003.

Todd

T_C_D wrote:

russc wrote:

Tjn182 wrote:you don't even need the IC -- i've been doing 10psi for 2 years w/o an IC until just recently.

Thats on 93 octane, right? On 91, you may not be able to run 10psi non-IC.

RussC

I ran 18psi non intercooled on 94 octane in 25F temps. Same day car went 109mph in the 1/4. Dec of 2003.

Todd

Right,
That was the magic engine car. Others will vary and will need some IC'ing to do that.

RussC

T_C_D wrote:

russc wrote:

Tjn182 wrote:you don't even need the IC -- i've been doing 10psi for 2 years w/o an IC until just recently.

Thats on 93 octane, right? On 91, you may not be able to run 10psi non-IC.

RussC

I ran 18psi non intercooled on 94 octane in 25F temps. Same day car went 109mph in the 1/4. Dec of 2003.

Todd

What was the elapsed time?

M635CSi wrote:

T_C_D wrote:

russc wrote:

Tjn182 wrote:you don't even need the IC -- i've been doing 10psi for 2 years w/o an IC until just recently.

Thats on 93 octane, right? On 91, you may not be able to run 10psi non-IC.

RussC

I ran 18psi non intercooled on 94 octane in 25F temps. Same day car went 109mph in the 1/4. Dec of 2003.

Todd

What was the elapsed time?

Off his site:

60' 2.327
330 6.058
1/8 9.023
MPH 84.28
990 11.447
1/4 13.577
MPH 108.96

russc wrote: Right,
That was the magic engine car. Others will vary and will need some IC'ing to do that.

RussC

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.

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.

Jeremy wrote:

russc wrote: Right,
That was the magic engine car. Others will vary and will need some IC'ing to do that.

RussC

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.

All that's needed to accomplish this is non-cali-craptacular formula 93 octane fuel.

I would highly recomend an oil cooler though.

Jeremy

Ooooh yeah an oil cooler. Man... you gotta have one of those.

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.

Mmm,
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

russc wrote:

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.

Mmm,
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.

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

What about adjusting the fuel pressure? Would that solve your problem?

M3fan4eva wrote:What about adjusting the fuel pressure? Would that solve your problem?

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.

RussC

don't forget cooler spark plugs for added safety.