I'm in the process of also puting a turbo on my '95 M50. First, you do not need a new pressure regulator or fuel pump for up to 1 bar boost. The stock ECU is your best choice, however you will need a custom tune to handle the increase of fuel to air mixture. Talk with Mike McCoy at TRM www.racersmarket.net
concerning your project and he can send you a new chip for your DME 413 with your tuning requirements. The OBDI cars are easy to tune with the stock ECU. You need a 3 1/2" Porsche 803 mass air flow meter to handle the charge, doesn't matter if you put it before the turbo or after the intercooler as it read the density of the air. You will need to upgrade the injectors to 42 lb. injectors, TRM has these.
Originally Posted by Jaap2
Hello BMW fans,
I have a '92 325i m50 and want to ad a turbo for some extra power. Now I read a bit about it on the net but but I want to keep it simple.
I already have a T3/T4 turbo, intercooler and exhaust manufold.
I want to keep the ECU as is and work with a vortech 10:1 fuel pressure regulator and maybe bigger injectors (now it's 166 cc/min).
My questions are:
Do I put the air mass sensor/meter between filter and turbo or between intercooler and inlet manufold?
Which size injectors can I use without getting complaints from the ECU?
Like mentioned I want to start basic and not change the motormanagement (ECU) that might be done later.