E30 injectors, 22 lb ?

[parkerbink]

If it turns out I can't, or shouldn't use them I won't.

[M-technik-3]

Not a big deal advertise them as RARE parts and watch how bids you get.

[parkerbink]

Not a big deal advertise them as RARE parts and watch how bids you get.

They would be rare cause they are the only ones I have!

[Tony S]

E36 M3 96 and on had 21.5 lb injectors, some called them 22lb

That is why there are 6 of them.

If this is the case will they work in your car, yes, you will probably run rich at idle and around town driving.

But for the price not bad, you can always sell them.

[Jordan]

i've always wondered why the BMW tuner philosophy for tuning fuel is changing injectors. could a rising rate FPR or other true fuel tuning device work just as well, if not better?

You can only push so much fuel through a stock injector. Once you raise the FPR up you will start pushing the injectors beyond their rated duty cycle.

Stock e30 injectors (325i) are rated at maximum "safe" duty cycle to feed 175hp or so.

[parkerbink]

E36 M3 96 and on had 21.5 lb injectors, some called them 22lb

That is why there are 6 of them.

If this is the case will they work in your car, yes, you will probably run rich at idle and around town driving.

But for the price not bad, you can always sell them.

Thanks. I was thinking e30 which is obviously a 4cylinder. duh.

[E30godz]

i've always wondered why the BMW tuner philosophy for tuning fuel is changing injectors. could a rising rate FPR or other true fuel tuning device work just as well, if not better?

You can only push so much fuel through a stock injector. Once you raise the FPR up you will start pushing the injectors beyond their rated duty cycle.

Stock e30 injectors (325i) are rated at maximum "safe" duty cycle to feed 175hp or so.

duty cycle and fuel pressure are independant of each other....correct?

you can increase fuel pressure which in turn will make more fuel come out within a smaller pulse width...meaning a lower duty cycle.

[Rob]

my understanding is the higher the FP, the higher the flow rate through the injectors, the higher the % duty cycle.

[E30godz]

but if you raised the fuel pressure on a stock engine (ie: same horsepower) wouldnt the duty cycle decrease, as they injectors have to stay open for a less amount of time?

[Rob]

if there is more fuel being squirted, isnt duty cycle increasing? I would think so. more fuel being squirted is due to longer pulse widths and increased duty cycle.

in your scenario, i think duty cycle would increase because the injectors are staying 'open' longer in order to get the added FP through

[E30godz]

no.


think of it like this.


if you have a car with 40 psi fuel pressure and X pulse width, and a car with 60 psi fuel pressure and the same X pulse width. Which car is going to get more fuel right then?


the 60 PSI car.


at any given pulse width, the car with more fuel pressure will supply more fuel.


so the increase in fuel pressure can take the place of a longer pulsewidth, decreasing duty cycle.

[Rob]

I guess.

[Digitalwave]

Nope but I am going to eventually do the mods to increase air/fuel flow and for the price figured i'd get the injectors now. If I can't use them I can afford to lose 20.50. Or I will put them back on eBay or something.

You're going to have to do some insane air flow mods in order to need 22lb/hr injectors. Hell, even for 19lb/hr. Stock injectors are like 14.5lb/hr, and are good for about 175-180 HP.

You will for sure need an adjustable fuel pressure regulator and some dyno time to get those injectors tuned in.

[parkerbink]

For 20.00 I am not unhappy I am thinking down the road about a serious Turbo setup with all the toys so if these are good (which I don't know) I will use them if not they can collect dust.

I had no clue what the car needed and the auction was ending, I really figured i'd be outbid, my high was 14.00, I got it for 13.50 plus 7.00 shipping.

[Digitalwave]

Well, a serious turbo setup would probably need bigger than 22lbs :) I agree though, that is a cheap deal, I would have done the same thing. I know you could resell them for more.