Author Topic: Mustang Injectors in an M42 engine (Read 261248 times)

epabillo · « **on:** March 31, 2006, 07:47:40 AM »

Mustang Injectors in an M42 engine

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I remember seeing a post regarding replacing the stock M42 e30 from 1991 318i injectors with bigger ones from a Mustang.... Has any one done it here? Please let me know...and if you have the part number as well.... How easy is the install?

dino245 · « **Reply #1 on:** March 31, 2006, 09:10:57 AM »

The stock injectors and the mustang injectors are physicly identicle. They both flow the same amount of fuel at 20.5lbs/hr although the mustange injectors are rated at 19lbs but this is at 33psi and not the 43psi of stock bmw, but the mustang injectors have 4 pintles or holes so the fuel is better atomized which produces a better burn and more power which is what we all want.

you can find the mustang injectors all day long on ebay just becareful of which one you buy the early mustang injectors are single pintle ask the seller to make sure that they are the right ones.

bmwman91 · « **Reply #2 on:** March 31, 2006, 10:46:58 AM »

So was it confirmed that the M42 injectors are 20.5#/hr? The PN is still the same as the M30 injectors, and I am really sure those are 17#/hr. I put in the S50 ones at 17.5#/hr, and it is running just fine, even a little smoother than before. It would be running really lean if I went from 20.5 to 17.5.

dino245 · « **Reply #3 on:** March 31, 2006, 11:45:40 AM »

I have used this site to determine the correct flow for the folowing injectors.
http://users.erols.com/srweiss/tableifc.htm

The ford injector is part number 0280150556 210.0 cc/min at 43.7psi (3 bar)
M42 injector is 0280150714 213.9 cc/min at 43.7psi (3 bar)
M50 injector is 0280150415 190.2 cc/min at 50.75psi

so the Mustang injector is just a little small but not enough to worry about.
The M50 injectors are rated at around 180 cc/min at 3 bar.

kowalski · « **Reply #4 on:** March 31, 2006, 12:34:55 PM »

finaly this issue has been cleared up!

bmwman91 · « **Reply #5 on:** March 31, 2006, 01:06:07 PM »

Yikes! I better put some higher flow ones in, STAT! I cannot be running around with the MAF conversion & these things!

bmwman91 · « **Reply #6 on:** March 31, 2006, 01:07:05 PM »

Oh, and what yeat Mustang can I find these injectors on? There is a Pick-N-Pull nearby with lots of them. I know only some have the 4-pintle injectors...was that year-specific?

tim_s · « **Reply #7 on:** March 31, 2006, 02:01:46 PM »

Quote from: kowalski

finaly this issue has been cleared up!

lol, why did no one listen to me?! I've said the m42 714s are 20.35lbs/hr for ages, even verified the part number with you mike to make sure the US part was the same!

kowalski · « **Reply #8 on:** March 31, 2006, 02:05:08 PM »

Quote from: tim_s

lol, why did no one listen to me?! I've said the m42 714s are 20.35lbs/hr for ages, even verified the part number with you mike to make sure the US part was the same!

haha i know, but yours is a crazy european car:) and i didn't have my Pn's to verify the same injectors. i was always told they were 17.5lb/hr. but thats ok cause i have the 4 pintle stang injectors.

dino245 · « **Reply #9 on:** March 31, 2006, 02:12:17 PM »

Tim s some times we need to learn the hard way. I tied the M50 injectors because of false info on another bmw forum. After I installed them and recalibrated the SMT6 I am using on the MAF conversion I did notice a positive change so I though nothing of it and then I did some research on them and was shocked to find they were smaller. I then settled on finding injectors with the same flow rate as stock with 4 pintle since I did not think I needed extra fuel since the M42 runs rich any way. I installed the ford injectors recalibrated the injectors and was plesently surprised at the results. There was a significant increase in the torque curve and the car pulled much better at the top end.

I dont know what year mustang these came out of but there are plently of them on ebay as 19lbs injectors since the ford fuel pressure is less than 3 bar.

kowalski · « **Reply #10 on:** March 31, 2006, 02:17:36 PM »

the m42 doesn't run rich...

dino245 · « **Reply #11 on:** March 31, 2006, 02:21:15 PM »

I have to disagree with you Kowalski, I use an A/F guage and it runs rich at WOT not by much but it is definatly not lean

tim_s · « **Reply #12 on:** March 31, 2006, 03:13:20 PM »

sorry, no offence meant chaps! as for the running rich at WOT - barely any cars run stoich at WOT, most run 12s/13s AFRs, the m42 is pretty lean for performance really

kowalski · « **Reply #13 on:** March 31, 2006, 07:59:00 PM »

Quote from: dino245

I have to disagree with you Kowalski, I use an A/F guage and it runs rich at WOT not by much but it is definatly not lean

do you have a wide band 02 sensor? or is it just the stock on?

bmwman91 · « **Reply #14 on:** April 01, 2006, 01:07:28 AM »

When I dyno'ed my car a while back the numbers were REALLY lean down low, and barely rich at higher RPM's. Here is a plot of the AFR. This was with stock injectors as well.

Author Topic: Mustang Injectors in an M42 engine (Read 261248 times)

epabillo