who knows their bosch injectors?

[dmjensen]

I've got a hell of a headache from this car.

I bought an e21 that has been converted to EFI components from what's believed to be an 85 318 e30. I don't know what injector size is suppose to be on a stock 85 m10 but i do know the part number on the injector ( 0280150211 ) tried to google both that number and 85 318i injector size and dug up nothing.

hopefully someone can help me out here. It runs okay, has no power to it. headers are glowing bright orange wich made me first think timing was wrong ( wholenother story...) checked timing and it was spot on to specs @ 1000, 2000, and 4000 so thats not it.

almost seems like to me now that fuel is the last thing. it's got 45psi of fuel pressure with a leaky tester so 47-50 actual psi. that leaves the injectors..

any help is much appreciated.

[Smelser]

glowing orange? thats a lean condition!

[dmjensen]

Should be rich. Lean would burn valves and cause detonation. Thats why when your ( usually turbo or heavily modded ) car is running too rich you can get your cats to glow.

[Smelser]

yeah, but you said headers not cats. cats heat up naturally from the chemical reaction. a rich running car runs MUCH cooler then a lean car. lean is power, but it is also hot, and tends to get so hot it burns crap up.

so rich yes would turn the cats glowing hot because there is SOOOO much chemical reaction going on.
lean on almost every race car I have seen (chev V8's) made the manifolds glow red- one night the carb came loose and let so much air in, the manifolds went red and burned up the wiring. seen another car lean it soo much on his jets that the manifolds glowed red as well.

use a noid lite make sure all the narness is ok to each injector?

[thebutterson]

14.04 lb/hr at 43.5 psi according to this site

http://users.erols.com/srweiss/tableifc.htm

[Smelser]

Hey butterson, would higher fuel pressure force more fuel thru? or just haveing more availible when you need it? like a slight modded or stock M10 with say 55-60 at idle, no vacuum on the regulator so when you hammer the gas it drops in pressure to say 45-50?

[thebutterson]

More pressure means more fuel with the same pulsewidth. The bently manual specifies an amount that the pressure should drop coming off idle.

I'm not sure what you're trying to ask. Are you trying to mod your m10 to have more pressure so you can get more fuel? It seemsl like your idle will be really rich then, probably past what you can compensate for with the afm.

[Smelser]

FPR is now located in the back by the fuel cell. so I dont have a vacuum line to it. we are pretty much wide open throttle all the time. just wanted to make sure that having sufficent pressure under heavy load at WOT wouldnt hurt the car when at idle in the pits or stopped during a red flag or driving around under caution laps.

we will play with the pressures a bit and see what what happens. just getting a starting point at the moment

[petrolhead]

I've got a hell of a headache from this car.

I bought an e21 that has been converted to EFI components from what's believed to be an 85 318 e30. I don't know what injector size is suppose to be on a stock 85 m10 but i do know the part number on the injector ( 0280150211 ) tried to google both that number and 85 318i injector size and dug up nothing.

hopefully someone can help me out here. It runs okay, has no power to it. headers are glowing bright orange wich made me first think timing was wrong ( wholenother story...) checked timing and it was spot on to specs @ 1000, 2000, and 4000 so thats not it.

almost seems like to me now that fuel is the last thing. it's got 45psi of fuel pressure with a leaky tester so 47-50 actual psi. that leaves the injectors..

any help is much appreciated.

I remember having trouble finding info about the 318i M10 injectors. I don't have the link, but from memory they are something like 150cc/min and the 318i uses 2,5 bar pressure regulator. a 3 bar item is available. I bought Bosch 0280150432 , they fit to the 318i fuel rail and manifold. They should have 60% more capacity than original injectors.

And no, I've no idea what those numbers are in psi or lb/hr. Convert them yourself :).

Check your ignition timing with a lamp, make make sure the ignition advance works, and works in the right direction. Some people have managed to put everything together so that ignition is retarded when it should be advanced. It'll make the exhaust side red for sure.

[Smelser]

And no, I've no idea what those numbers are in psi or lb/hr. Convert them yourself :).

METRIC BABY!!!

as a canadiangoing to school in the 80's and 90's it was hell trying to learn imperial on my own. we were some of the first "metric only" generation in the schools. wonder if it has changed since!!
but it was easy! 1KM=1000M
1M=100CM
1CM=10MM :hitler:

[Jaxx_]

my 84 318's m10 injectors were, if I can recall correctly, 14 lb/hr. I can't remember the exact number either. All I know is that with ~315cc/min (30 lb/hr) injectors at redline they are around 50% duty cycle.

CC/minute = lbs/hour x 10.5