M30 OEM Turbo project

[kamotors]

For now it's the Miller MAF/WAR system since I already have it. If I'm not happy with it, I'll go MS.

I give it 6months. while Miller is excellent for N/A cars it fueling seems to depend on RPM vs true airflow.

for example if you only make a couple psi in first but your tuned for lets say 7psi in 3rd gear, you'll run very rich in first gear because it will send the same fuel amount for that RPM even though there is much less air flow in that gear. you can always get a medium AFR, example- not so rich in first and then a bit lean in other gears but a turbo E30 deserves better!

[RCM3]

Just read your whole build thread up to now. Very cool swap, youre doing some great work!

[CorvallisBMW]

I give it 6months. while Miller is excellent for N/A cars it fueling seems to depend on RPM vs true airflow.

for example if you only make a couple psi in first but your tuned for lets say 7psi in 3rd gear, you'll run very rich in first gear because it will send the same fuel amount for that RPM even though there is much less air flow in that gear. you can always get a medium AFR, example- not so rich in first and then a bit lean in other gears but a turbo E30 deserves better!

Interesting. That's good to know.

Brody at Miller said he actually has a tune for the m106 system on an m30b35, and said he'd send it to me. That was like 3 months ago though...

[kamotors]

If your turbo Is small enough to get decent boost in first you should be fine but turbos have lots of variables that are difficult to fine tune when the ecu has no idea of actual boost levels. Like say it's really cold, you'll usually spool a tad quicker and possibly hit 1-2psi more boost, Miller will not be able to send more fuel earlier or in more quantity. It can work but it's oblivious to boost levels and takes like 2-5min to load tunes onto vs 1-2seconds with ms.

[SkiFree]

Love this project.

If you're working directly with Brody for a tune then you'll be fine. What you've got now will be fine for your intended purpose.

[CorvallisBMW]

I appreciate the advise guys, more info is always better.

[CorvallisBMW]

Starting to piece together my gauge setup. My plans are for oil temp, oil pressure, and either water temp or A/F ratio. I want to use VDO "Vision" series, like these: http://www.summitracing.com/parts/vd...FfsaAv_O8P8HAQ
But I can get them through Blunt at a better price.


I figure the senders are easy:
Water temp measured at the thermostat housing in one of the spare ports
Oil temp and oil pressure measured at the stock idiot light location using a tee

I'm debating on either A/F or water temp.. Or maybe replacing the stock e30 temp gauge with the VDO unit, then doing A/F down by the cubby hole? Not sure yet, but A/F would be something like this: http://www.summitracing.com/parts/sum-g2996/overview/
How important would it be to have an A/F gauge on a setup like mine?

It will all go in to a cubby gauge pod like these: http://www.r3vlimited.com/board/showthread.php?t=336986

[ak-]

Yeap.

Besides power, ground, you'll have an output 1 and 2 wire.
One goes to your gauge which will show AFR readings once the car is on. The other output wire will be connected to your ECU for O2 reading purposes and/or data logging, or just capped off if you're not going to do that.

[CorvallisBMW]

M30 OEM Turbo project

I need some help with this whole oil filter/oil feed thing. The stock hard oil feed tube has a flared fitting on the oil filter side:




But the oil filter housing has nothing like this at all.


It does however have these two small ports on the far (firewall) side of the housing. They're normaly plugged with a couple M6x1.0 screws:




They do feed in to the other standard oil galleys. I can blow compressed air through them. Does anyone know much about them? Could they be used for an oil feed? I'd need to drill and tap them out to a larger 1/8NPT size but that isn't hard.

[e30m3s54turbo]

Here how I tap into it.

[CorvallisBMW]

M30 OEM Turbo project

Unfortunately mine doesn't seem to have that same tap-able spot. What year/model is your filter housing from Raul?

[e30m3s54turbo]

I bought the motor out of a 1988 e32 735i. Production date is 11/87 universal m30 block.

[CorvallisBMW]

^Looks like I might need to do some junkyard searching then.


A little more searching led me to realize the two ports in the photo below don't lead to the same chambers.

The lower screw/port leads to the smaller, triangular chamber on the housing (outlined in blue). I don't think this chamber normally gets any oil as it seems to be isolated from the rest of the chambers. Can anyone confirm?


The upper screw/port leads to the main chamber (outlined in red). Would this be a decent place to pull oil from for the turbo?



Block:

[kronus]

yeah that's the filtered oil chamber

[CorvallisBMW]

Which one is? Blue or red? I assume by 'filtered' you mean the return, as opposed to feed. Would both chambers be pressurized or just the feed?