m42 tuning

[bmwconnect]

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?

 
It's before that turbo spools is where tuning plays a big part. No tuning = slow spool times, overly rich conditions, and in worst cases you compress the fuel.

Yes there is start up open loop enrichment based on coolant temp witch will foul plugs when you toss in bigger injectors.

People will still continue to believe they can just swap in different injectors without software, without understanding the consequences.

oh well

[Esprit Aviation]

We get 5psi @ approx. 2500RPM and typically don't shift at less than 2500. I am well aware of when open loop occurs. Plugs are clean, never a start failure in 20k mi. of driving including winter 2010-2011 in Upstate NY.

We understand the consequenses. In 20k mi. with this set-up there are none; and that's acceptable to us.

[hondo898]

I should be able to run a t3 turbo with no issues also as long as I use the Injectors from the 900. If I'm thinking correctly

[Esprit Aviation]

You should be able to run the t3 ok. It is a bit larger and will have a bit more lag; however they are easier to find and they have the same flanges. You will easily keep the t3 within a very efficient area of the map. Later on if you significantly increase boost you will most likely remain efficient.

T3 equipped cars may have had slightly different injectors. I am not certain.

[hondo898]

I currently have a few saab mechanics that I know keep an eye out for a te05-12b turbo. Worst case ill grab a t3 or something comparable. You have been a great help, I appreciate it!

[Esprit Aviation]

Bump for update! Did you locate a turbo?

[BeemerDan]

I realize this is an old thread, but how many hp was the car running with 5psi? And is it still working fine?

Thanks!
Dan