Author Topic: Mustang Injectors in an M42 engine (Read 261292 times)

2002maniac · « **Reply #15 on:** April 01, 2006, 01:23:28 AM »

When I dyno'd my car stock the A/F was in the low 13's across the board. The dyno operator said that is about what they aim for when tuning for power.

bmwman91 · « **Reply #16 on:** April 01, 2006, 03:54:16 AM »

When you say stock, you talking M10 or swapped M42?

tim_s · « **Reply #17 on:** April 01, 2006, 04:27:06 AM »

bmwman, i'm not sure yours was running right on that dyno run, that at WOT? that seems way too lean at 3k and too lean throughout, even for a standard m42. all your motronic sensors etc on form, o2 ok and fault codes clear etc?

bmwman91 · « **Reply #18 on:** April 01, 2006, 12:37:31 PM »

That was on the previous car. I am pretty sure everything was running A-OK. I heard somewhere that the Conforti chip is tuned a little lean, but I could be wrong. Anyone else have a plot to compare it to? Stu McHenery, YEARS ago, said that the M42's problem is its injectors not flowing enough, and it does lean out a little up top...it was something BMW did for emissions.

tim_s · « **Reply #19 on:** April 01, 2006, 01:31:26 PM »

Quote from: bmwman91

That was on the previous car. I am pretty sure everything was running A-OK. I heard somewhere that the Conforti chip is tuned a little lean, but I could be wrong. Anyone else have a plot to compare it to? Stu McHenery, YEARS ago, said that the M42's problem is its injectors not flowing enough, and it does lean out a little up top...it was something BMW did for emissions.

i'm not sure if it leans out at high rpms, but 20lbs injectors sound ok to me for a car with 140bhp. i know the standard chip is configured towards stoich for economy, but still imo that AFR graph you've got really seems way too lean at 3k, a bit up and down and generally a bit lean really. 16.5 at WOT at 3k is nasty. 15 or so would be ok, but 16.5 is surprising. you'd expect it to at or below stoich all the way on WOT, mb a bit higher at low rpms. even if on the graph yours wasnt at WOT until about 3.5k, 16.5 is lean anyway.
what power did it put down like that?

tim_s · « **Reply #20 on:** April 01, 2006, 01:35:11 PM »

i wonder if all m42s are like that, would be good to have a comparison...

jfdublyu · « **Reply #21 on:** April 01, 2006, 06:07:24 PM »

hey guys, what type of injector would yield best performance on a stock m42 w/ a Jim Conforti Chip?

kowalski · « **Reply #22 on:** April 01, 2006, 07:02:44 PM »

just go to the 19lb ford 4 pintle ones, since they're the same flow, but better atomization.

shellback · « **Reply #23 on:** April 01, 2006, 07:10:11 PM »

Maybe I missed it but did we ever get a recommended year Mustang to pull these injectors from?
Thanks,
Chris

jfdublyu · « **Reply #24 on:** April 12, 2006, 11:45:02 PM »

so i bought some of the mustang injectors, but i have never pulled injectors from an M42. does anyone have a DIY or pics? how long does it take? do you have to remove the valve cover gasket or anything else?

2002maniac · « **Reply #25 on:** April 13, 2006, 12:26:20 AM »

Quote from: bmwman91

When you say stock, you talking M10 or swapped M42?

huh? My car is a '91 318is. This is m42club right? :p

bmwman91 · « **Reply #26 on:** April 13, 2006, 01:52:11 AM »

Lol, for some reason I thought you were driving an M10 318 with the M42 swapped in. Silly me.

shellback · « **Reply #27 on:** April 13, 2006, 10:33:30 AM »

"The ford injector is part number 0280150556 210.0 cc/min at 43.7psi (3 bar)"

"just go to the 19lb ford 4 pintle ones, since they're the same flow, but better atomization"

Folks, please, what year Mustang?

asubimmer · « **Reply #28 on:** April 13, 2006, 11:13:28 AM »

I have some 0 280 155 715 Fords.

M42boy · « **Reply #29 on:** April 13, 2006, 04:15:11 PM »

I don't know about all this Ford injector stuff. If you guys want to get real technical you can get the RC custom or software programable ones, but they are real pricey.

Only Ford part going on my car is the Ox sensor. I think I used a Mustang or a Probe one on my last car as it was the cheapest Bosch on I could find. I think it was exactly $21. It's exactly the same one as the one for the BMW, minus the harness plug. Splice three wires and you're back in business.