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2.8L M20 9.8:1 stroker build: my 323i reincarnated
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Swapped with a friend's FPR and it's exactly the same. Either it's the pump or my gauge is off.
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I thought so too, so I checked for like the third time lol.
Nope
It appears to hold pressure perfectly though, it's clear the diaphragm isn't ruptured. New fuel filter. Maybe it's the pump, I'm not 100% sure. Cheapest regulator I could find for a Bosch was $100 at NAPA. Its painful to see literally every other fuel pressure regulator is like $80 max. Even the higher pressure 944 one.
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Originally posted by 2mAn View PostDid the M30 AFM fit mount directly to the OEM airbox?
Other news- looks like my fuel pressure is all f'd up. I'm going to try a new FPR first and if that doesn't do anything, I'll start looking at the fuel pump.
I teed in a gauge to the fuel supply line. Here's what I saw:
Video
Does this look like a bad FPR? Low pressure, not increasing pressure with RPMs. With vacuum line disconnected it reads almost 3 bar. But with revs it doesn't seem to increase that much.
Better vid of revving pressure
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The dyno wideband will clip into the tip of the exhaust. It's doubtful they would install one in your mid-pipe in place of the stock O2 sensor.
You will benefit a lot from a proper tune, even on Motronic. But you'll really feel a difference switching to Megasquirt, deleting the AFM, and having a fully proper tune done.
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Originally posted by wworm View PostAnd man that porsche reliability....kind of amazing.
Anyways. As for my E30, I've decided to try to install a wideband O2. I'm going with an Innovate LC-2. It will let me monitor AFR and simultaneously send corrections to the ECU and I figure I will probably install one eventually so might as well do it now, before the dyno.
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Originally posted by betz View PostYup that's next to my Boxster. It's been tremendously reliable. Only mod so far is taking out the intake silencer for dat induction noise. Only future mod is a short throw shifter that's waiting to be installed.
I wouldn't hold your breath for the ITBs, but the long tubes will be installed in probably a month or so. In the meantime- I will try and get you a sound clip of it as it sits. I even got an external mic just for the occasion :)
Either way, this will definitely sound damn good. Looking forward to sound.
Originally posted by 2mAn View Postand a 2.8L M20 is one of the plans.
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Originally posted by betz View PostI see. Well I hope you're getting the jist from my thread here that it wasn't an entirely straightforward process, for tuning at least. When I'm done I'm planning to compile a list of necessary parts for the build and such, hopefully to make it easier for anyone else attempting the build.
It is very doubtful the first dyno will be anywhere close to 200whp. We're talking a motor with far from the ideal tune, on stock intake manifold, throttle body, exhaust, a pretty mild cam, stock valves, with no porting. But as time goes on and I decide to change some of those things.. who knows :D
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Originally posted by 2mAn View PostIt’s got solid compression numbers but there’s a nasty dip in 2 consecutive cylinders, which I suspect to be a head gasket issue. My “stage 2” plan for the stock motor is the head gasket, which I’ll probably add a cam at the same time. If a cammed 2.5 M20 still isn’t enough then I have like 5 different ideas, and a 2.8L M20 is one of the plans.
I really hope this gets close to 200whp though I know the numbers weren’t your goal. I just feel like M20s haven’t gotten a fair chance to showcase their potential
It is very doubtful the first dyno will be anywhere close to 200whp. We're talking a motor with far from the ideal tune, on stock intake manifold, throttle body, exhaust, a pretty mild cam, stock valves, with no porting. But as time goes on and I decide to change some of those things.. who knows :D
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Originally posted by betz View Post
As for you, if you have a healthy M20B25 I would run that, at least for a while. No need to tear it apart unless you are motivated to build a motor. The 5 speed is a much more important addition to your car than better HP or more torque, IMO. Like I said, this build was never for chasing numbers!
It’s got solid compression numbers but there’s a nasty dip in 2 consecutive cylinders, which I suspect to be a head gasket issue. My “stage 2” plan for the stock motor is the head gasket, which I’ll probably add a cam at the same time. If a cammed 2.5 M20 still isn’t enough then I have like 5 different ideas, and a 2.8L M20 is one of the plans.
I really hope this gets close to 200whp though I know the numbers weren’t your goal. I just feel like M20s haven’t gotten a fair chance to showcase their potential
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Originally posted by wworm View Postnext to your boxter?\
cant WAIT to hear this thing with itbs and long tubes.
I wouldn't hold your breath for the ITBs, but the long tubes will be installed in probably a month or so. In the meantime- I will try and get you a sound clip of it as it sits. I even got an external mic just for the occasion :)
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