Author Topic: m42 tuning (Read 16870 times)

hondo898 · « **on:** January 31, 2012, 08:24:34 PM »

I currently have a 325i e30. I have the chance to recieve a m42 for my car which in my understanding swaps directly in with little to no modifications. With that said, I figured I would throw a quick turbo set up on it since since I have the resources. Only problem im running into is tuning. I dont want to spend an arm and a leg on this project since its literally just something quick and for fun. What do you guys use for tuning thats cost effective and reliable. I know there are some stand alone tuners for around 1-2k but i was hoping to stay below that cost.

DesktopDave · « **Reply #1 on:** February 01, 2012, 07:32:32 AM »

I approved your post (sorry it took so long, I was on vacation).

Megasquirt or VEMS are both reasonably priced, though sticking with the stock DME and re-tuning it is also possible. There are a few members on the board that can help you out as well.

bmwconnect · « **Reply #2 on:** February 01, 2012, 08:48:41 AM »

Quote from: hondo898;109921

I currently have a 325i e30. I have the chance to recieve a m42 for my car which in my understanding swaps directly in with little to no modifications. With that said, I figured I would throw a quick turbo set up on it since since I have the resources. Only problem im running into is tuning. I dont want to spend an arm and a leg on this project since its literally just something quick and for fun. What do you guys use for tuning thats cost effective and reliable. I know there are some stand alone tuners for around 1-2k but i was hoping to stay below that cost.

For under $400 you can have full control of the stock DME. Get a ostrich 2 http://www.moates.net/ostrich-20-the-new-breed-p-169.html

contact me for a midnight xdf and boost starter files for whatever injectors size,DME#, EWS delete, and chip software version you have. Also make sure you run the AFM draw threw setup, when tuning stock DME for best results

regards|

hondo898 · « **Reply #3 on:** February 05, 2012, 12:37:07 AM »

Thanks guys! I will be sure to look into that!

cristimm · « **Reply #4 on:** February 05, 2012, 04:47:22 AM »

Quote from: bmwconnect;109932

Also make sure you run the AFM draw threw setup, when tuning stock DME for best results

regards|

What do you mean by "AFM draw threw setup"?

Esprit Aviation · « **Reply #5 on:** February 05, 2012, 10:04:08 AM »

What is your goal for power output?

We designed a e30 turbo set-up around the stock header (see "Stock Header Turbo Build" in the 'swaps' which is vastly more efficient than any log style manifold. It includes a teo5-12b turbo and injectors from a 1992 Saab turbo.

It is set at 5 PSI boost. There was no tuning, no intercooler or RRFPR necessary. The car was driven to the fullest extent possible on Watkins Glen for

1/2 hour sessions and had no problems. It continues to be driven on a daily basis.

cristimm: The draw through set-up puts the AFM on the turbo intake. The blow through puts it between the pressure side of the turbo and the intake.

Ours is blow through. At low boost pressures I believe this may slightly improve initial throttle response via faster opening of the AFM vane.

Most stock turbo set-ups use the draw through. This may be desireable if higher boost pressures are utilized.

hondo898 · « **Reply #6 on:** February 05, 2012, 09:49:11 PM »

I am just looking for a slightly higher powered car than stock. Not looking for anything crazy just a fun Sunday car. I'll look into this setup.

bmwconnect · « **Reply #7 on:** February 05, 2012, 10:05:18 PM »

Quote from: Esprit Aviation;110008

What is your goal for power output?

We designed a e30 turbo set-up around the stock header (see "Stock Header Turbo Build" in the 'swaps' which is vastly more efficient than any log style manifold. It includes a teo5-12b turbo and injectors from a 1992 Saab turbo.

It is set at 5 PSI boost. There was no tuning, no intercooler or RRFPR necessary. The car was driven to the fullest extent possible on Watkins Glen for 1/2 hour sessions and had no problems. It continues to be driven on a daily basis.

cristimm: The draw through set-up puts the AFM on the turbo intake. The blow through puts it between the pressure side of the turbo and the intake.

Ours is blow through. At low boost pressures I believe this may slightly improve initial throttle response via faster opening of the AFM vane.

Most stock turbo set-ups use the draw through. This may be desireable if higher boost pressures are utilized.

What flow rate are those Saab injectors?

hondo898 · « **Reply #8 on:** February 05, 2012, 10:06:32 PM »

So your car runs fine with that setup? No tune needed?

bmwconnect · « **Reply #9 on:** February 05, 2012, 10:15:08 PM »

Quote from: hondo898;110025

So your car runs fine with that setup? No tune needed?

If you are putting in bigger injectors and changing hardware that effects how the motor run's you will always need a tune other wise you will foul plugs, foul O2 sensors, compress fuel in the cylinders, water down the oil with gas, and experience pre-detination with higher boost levels etc.

hondo898 · « **Reply #10 on:** February 05, 2012, 10:50:51 PM »

I know the maf will correct some. But according to him no tune is needed for low boost. Remember I'm shooting for around 5/6psi

Esprit Aviation · « **Reply #11 on:** February 06, 2012, 06:16:17 AM »

An NGK 'AFX Powerdex' AFR meter indicates the stock Saab 2.0l 22.6lb/hr injectors and turbo are a very good match for the 1.8l M42 @ 5psi boost. No tuning necessary. In addition to running WOT for 4 hours on Watkins glen, the car has approx 20k mi. w/ this set-up.

bmwconnect · « **Reply #12 on:** February 06, 2012, 08:02:55 AM »

Quote from: hondo898;110027

I know the maf will correct some. But according to him no tune is needed for low boost. Remember I'm shooting for around 5/6psi

There is no MAF on the M42, it's a AFM and the sensor works on the flap principle, measuring air throughput very precisely and delivering the signal for air quantity per unit of time to the control unit. The only hardware beyond the AFM that corrects fuel delivery in real time is the lambda sensor

bmwconnect · « **Reply #13 on:** February 06, 2012, 08:24:28 AM »

Quote from: Esprit Aviation;110032

An NGK 'AFX Powerdex' AFR meter indicates the stock Saab 2.0l 22.6lb/hr injectors and turbo are a very good match for the 1.8l M42 @ 5psi boost. No tuning necessary. In addition to running WOT for 4 hours on Watkins glen, the car has approx 20k mi. w/ this set-up.

Ok you can get away with those injectors cause the flow rate is not a huge increase over stock and lambda sensor will correct without fouling but there is noway you AFR's are stable across the board at WOT or in open loop mode

Esprit Aviation · « **Reply #14 on:** February 06, 2012, 03:05:58 PM »

WOT AFR is consistently 11.5:1 to 12.0:1 at 5psi, 2500 to 6000 RPM; verified by my son during the track sessions.

Is there any other open loop mode that we really care about other than WOT?