OBD1 M52 E30 rpm Problems

[wheelies247]

Hello everyone its Jay im new here and just wanted to say hi before i start..
I have a 87 325e with m52 OBD1 with 95 325i trans 5speed..
- M52 converted over to obd1
- 21.5 pink top injectors
- 413 red label computer
- CAI with a 9" Cone
- new o2 sensor obd1
- stock chip stock tune

Other then thats its pretty stock my problem is in 1st,2nd,3rd,4th sometime while im in the rpm from 0-5000 its fine and once it hits 5100 it like hitting a wall then if i stay on the gas it keep going then at 5800-6000 it hits the wall again then its fine like all the power is there it does that in all 4 gears and i want to know if anyone can point me in the right direction

Thanks J

[jrdeamicis]

Hello everyone its Jay im new here and just wanted to say hi before i start..
I have a 87 325e with m52 OBD1 with 95 325i trans 5speed..
- M52 converted over to obd1
- 21.5 pink top injectors
- 413 red label computer
- CAI with a 9" Cone
- new o2 sensor obd1
- stock chip stock tune

Other then thats its pretty stock my problem is in 1st,2nd,3rd,4th sometime while im in the rpm from 0-5000 its fine and once it hits 5100 it like hitting a wall then if i stay on the gas it keep going then at 5800-6000 it hits the wall again then its fine like all the power is there it does that in all 4 gears and i want to know if anyone can point me in the right direction

Thanks J

21# injectors on a car that runs 17# stock with a stock tune for a 2.5.

Get a 2.8 tune for your 21# injectors. And of course the .3 difference in displacement.

[wheelies247]

I dont get what your saying exactly..The motor is a 2.8 and the 21 are stock on this motor i thought.. So your saying that because of the 413 red label i should get a chip/tune for my set up ? Cause the 413 is for m50 2.5 right or wrong ? Cause when i plug the scanner it says

DME M3. 3.1 M50B25
Bocsh H/W No. 0261200413
bocsh s/w No 1267357623
bmw h/w no. 1703563
bmw s/w no. 000
product no. 462

All this is from a Launch scanner

If this means anything to ANYONE....

[jrdeamicis]

I dont get what your saying exactly..The motor is a 2.8 and the 21 are stock on this motor i thought.. So your saying that because of the 413 red label i should get a chip/tune for my set up ? Cause the 413 is for m50 2.5 right or wrong ? Cause when i plug the scanner it says

DME M3. 3.1 M50B25
Bocsh H/W No. 0261200413
bocsh s/w No 1267357623
bmw h/w no. 1703563
bmw s/w no. 000
product no. 462

All this is from a Launch scanner

If this means anything to ANYONE....

The pulse width in the ECU is based on #17 injectors not #21.

21# injects are for the M52 on the M41.1 engine management, not M3.1.1.

Call TRM and ask them for a M52 OBD1 on 21# injectors. They will send you the tune (that you will NEED no matter what)

Then after you have the tune start your diagnosis.

The 2.8 VS 2.5 is a 12% difference in displacement. Add the wrong size injectors and run it on a base 2.5 tune and you may have some problems.

[328ijunkie]

You need a chip.

[jrdeamicis]

You need a chip.

SHHHHHHHHHHHHHH - You are wrong! Dead wrong!

They need a harness! :p