M42 turbo fact thread

[varg]

I'm currently working on a guide to using megasquirt on an M42, based on my setup, with the goal of consolidating the info for others to use. It's not a priority because I have school, work and the work that needs to be done to my car, but it should be done by the end of the month.

If anyone wants to share info on their MS setups, I can try to incorporate it into my guide, giving people alternatives to how I did things or just showing what can be done.

The OEM E30 intake manifold starts to become a serious problem around 300whp.

Good to know.

[m42_turbo]

When you use Pyramid rings, if you remove the head does anything need to be done before re-installing?

Yes, new gasket , is better new rings !The head planning is normal to do then head was removed!!!

What was the spool like with the GT28?

TD05 spool like gt2871r ... around 3000 rpm 1.0 bar boost!

[econti]

What was the spool like with the GT28?

[e30guydownunder]

When you use Pyramid rings, if you remove the head does anything need to be done before re-installing?

[m42_turbo]

Hi , I have m42b18 turbo from 2010 ... first setup was on garrett GT2871R with all stock but with forget pistons , on 1.1 bar boost was make 290bhp
New setup was built autumn of 2014, and what I have :)

M42 B18
Ported head "VAC MotorSport stage3" for this moment with stock cam shaft
TD05 HR 16G 10.5T twinscroll turbo oil and water cooled.
Forged FCP Engineering pistons 8.5:1
Forget Connecting Rods FCP Engineering
ACL racing series bearings
PPF pyramid rings head gasket
Full ARP fastening hardware (connecting rod bolts, main studs and head studs)
3inch turbo back full custom exhaust no cat no resonators
Custom inlet and outlet manifold
3 inch intercooler piping
INVENT EMS full sequential
680cc injectors LOW imp
GM style Intake air temp sensor
on low boost 1.2 bar about 330+ bhp

[e30guydownunder]

The OEM E30 intake manifold starts to become a serious problem around 300whp. At this point fitting a plenum style intake such as the 666Fab unit (no longer in production) large gains can be made.

Typically ITB's are not designed with positive pressure in mind so you have problems with air leaks around the throttle shafts. Take care of this and ITB's can offer similar benefits on a turbo car to that of an NA car. Having said that in most cases a suitably sized plenum and single reasonably large throttle is all that's required.

[elcoy]

So what are peoples thoughts about stock intake vs. a ITB/plenum setup on a turbo motor? At what point does the stock intake become the limiting factor? Does the turbo negate the positive impact of the ITB's?

[gwb72tii]

I just picked up a 1991 318i and I'm going to mod the motor somehow.
So the choice i think for me is a typical M50/M52 twincam, or turbo the M42

So you that drive you M42 turbo all the time, how is it? other than more horsepower, how's living with it everyday? This will become a daily driver for me.

[RedReplicant]

Theres really no need to modify or make your own harness. You use the OEM 88 pin harness when you build a PNP unit.

Are you cutting apart a stock ECU (they are expensive, relative, used) for the connector and making a breakout board? How are the coils driven?

[Dj Buttchug]

That's too bad. I guess the best option is to buy a used harness and make my own MS harness from it.

Theres really no need to modify or make your own harness. You use the OEM 88 pin harness when you build a PNP unit.

[RedReplicant]

Yes And no. There is a company that sells an unauthorized version. I own one. However, they are not good. Mine is near impossible to tune and I wish I had built my own.

That's too bad. I guess the best option is to buy a used harness and make my own MS harness from it.

[elcoy]

Whats your power goal? 9:1 compression would probably be better IMO.

Why such an ancient turbo choice? Are you getting it used for cheap??

Ideally I am shooting for 300+

I guess I didn't know that was an ancient turbo, what would be a better choice?

[jntar]

Is anyone still making a Megasquirt PNP unit for the M42?

Yes And no. There is a company that sells an unauthorized version. I own one. However, they are not good. Mine is near impossible to tune and I wish I had built my own.

[RedReplicant]

Is anyone still making a Megasquirt PNP unit for the M42?

[wazzu70]

Whats your power goal? 9:1 compression would probably be better IMO.

Why such an ancient turbo choice? Are you getting it used for cheap??