M42 Performance

[Bimmerfanatik]

I got better low end torque with the 3.5 bar fuel pressure regulator...

Is that your only mod? Usually, the more fuel you give it, the more air you have to give it. I'll assume youve compensated for the increase in fuel, or are running rich :)

Point: If you want to give someone advice for more power, make sure you tell them there are other mods necessary to appreciate the gains.

[Rob]

My next E30 in a few years will probably be an M42 for gas milage alone.

might want to research beyond the usual forum bullshit on that one bubba

[fabianyee]

the ECU readjusted itself but still higher than when running with the 3.0..

After few days, tried putting back the 3.0 and it was just running lean even after 1 day... so put back the 3.5....

[BS87]

My next E30 in a few years will probably be an M42 for gas milage alone.

might want to research beyond the usual forum bullshit on that one bubba

This is true, But don't they get 5-9 more mpg on average?

[clutterbucker]

They're lighter than 325's by far, so they have that going.

You really think they're that much lighter than M20's? From what I can remember....it's only a difference of a few pounds. Maybe the distribustion of weight over the front wheels is the deciding factor, but that almost be completely nulled by the removal of AC.

Just checked...258lbs vs. 220lbs. Take off the 325's AC and the weights are almost identical I'm sure. Then you just have to deal with those two extra cylinders being so far up. For the extra 30hp and gobbs of torque, I'd take the slight distribution problem.

[nando]

They're lighter than 325's by far, so they have that going.

You really think they're that much lighter than M20's? From what I can remember....it's only a difference of a few pounds. Maybe the distribustion of weight over the front wheels is the deciding factor, but that almost be completely nulled by the removal of AC.

Just checked...258lbs vs. 220lbs. Take off the 325's AC and the weights are almost identical I'm sure. Then you just have to deal with those two extra cylinders being so far up. For the extra 30hp and gobbs of torque, I'd take the slight distribution problem.

the 318is overall weighs less, it's not just the motor. it's a good 200lb difference.

[Gr00v3]

and if you remove the ac on the 318is... then it'll still be 200 lbs lighter. also the 325's have trunk tar whereas the 318s dont
________
CHILD NEXIUM

[nickmp0wer]

My next E30 in a few years will probably be an M42 for gas milage alone.

might want to research beyond the usual forum bullshit on that one bubba

This is true, But don't they get 5-9 more mpg on average?

i averaged 29mpg on my last tank. No bullshit rob!!! this next fill up im gunna drive like a waffleswaffleswaffleswaffleswaffles to see the difference

[Rob]

I get about the same. M20s can come pretty close to that on the highway. the actual day to day difference is not as huge as people think, and when you factor in that stock m20s can run lower octane than stock m42, that distinction is all but negated

[Digitalwave]

They're lighter than 325's by far, so they have that going.

You really think they're that much lighter than M20's? From what I can remember....it's only a difference of a few pounds. Maybe the distribustion of weight over the front wheels is the deciding factor, but that almost be completely nulled by the removal of AC.

Just checked...258lbs vs. 220lbs. Take off the 325's AC and the weights are almost identical I'm sure. Then you just have to deal with those two extra cylinders being so far up. For the extra 30hp and gobbs of torque, I'd take the slight distribution problem.

Robbie's 318iS is more than 200lbs later than my 325i, and neither car has much weight reduction nor weight added.

[bmwm3n528]

I'd like to feel my car with a lighter flywheel...that's one of the few things that bugs me about the M42 is it's slow revs.

As far as the gas mileage deal goes...if you're not on the hwy the 318is doesn't seem to get much, if any, better around town...especially if you're on the right side of the tach.

[e9nine]

I drove my m42 hard most of the time, not like an ass but you know what I mean hopefully. Fuel economy wasn't a thing to list as a plus and as Rob mentioned, the fact you need high OCtane fuel negates savings. The most fuel efficienct e30s are the eta and m10 motors.

With the lighter flywheel, the engine will loose momentum faster.It's so funny how in the eta and m42 you can press the clutch and notice how the revs are held versus a car with a lighter fly or m20b25. Tradeoffs for the less powerful motors. Also makes them easier to drive.

[nickmp0wer]

im planing on doing a lightweight flywheel, is it worth it?

[bmwm3n528]

im planing on doing a lightweight flywheel, is it worth it?

From what i've heard it's pointless to anything lighter than 325 flywheel.

[nickmp0wer]

if thats true it would save me some money, but i would think one of the lightweight 325 flywheels (8lb) would help the engine rev even better