BONNARSKI

Has anybody on here turbo'd an BMW that's running the Bosch L-E Jetronic engine management? Looking to turbo my 1986 E28 520i instead of going down the whole " put a bigger engine in it " route, turbo all the way!!!

txdohczc

most evryone does it with mega squirt tuning

BONNARSKI

Yea, that seems to be the favourite but i'm wanting to know if there any way to keep the orgional Jetronic? Don't have a job so can't afford MS so thats why i'm just wanting to try it the cheap way. Not looking for massive power, looking to run about 0.8bar of boost. As far as i know at that presure the timing doesn't need to be adjusted. I will be running 24lb injectors, M30 AFM and throttle body on a custom inlet manifold. It's just the timing side of things i'm not to hot on.

txdohczc

well if you dont have money then get an fmu

BONNARSKI

Seen that fmu alot on here. Is that a rising rate fuel presure regulator?

snowdrift

fuel management unit.. that's all i know. haha.
i'm still tryin to put together a kit of my own. but you should be fine on low psi without Megasquirt from what i understand.

txdohczc

yes. it is a bad idea if tuning is cheap but its not chep for bmws so that is your best bet stay around 6 psi though

bb

pretty good route to go turbo with those, they got some good info on bmws at e30tech.com look under forced induction

2BarRacing

I believe with a 535i maf and larger injectors you can set the maf a little stiffer for use with the bigger injectors and then you should be golden. should fool the ecu almost like an afc hack I used this setup on a digifant II Vw. worked quite nicely

dot communist

no offence, but if you cant afford to pay 140 dollars for an EFI unit with free software, how do you expect to buy things like the actual turbo and the intercooler/piping and all that other important stuff? I have seen alot of the guys running the big 6's without megasquirt (or intercoolers for that matter) and are getting away fine with an FMU setup, but really, you are going to be spending more in the end, and this is why:

FMU setup:
-FMU itself plan on around 100.00
-Possibly a new fuel pump, ~127.30 (google shopping)
-bigger injectors, 24lb (good for FMU) ~250.00
-WBO2 sensor+display to tune the AFM ~229.00 (diyautotune.com)
so there you end up with a rough estimate of 706.30
and then you have to spend alot of time tuning and all that and have huge risks of detonation and fuel lines popping off and all that.

Megasquirt:
-unassembled MS1 kit 139.00 (diyautotune.com)
-NAW OEM WBO2 sensor 50.00 (14point7.com)
make your own harness, tune it yourself with the free software, and generally just tap into that HMT spirit and you have a damn reliable EMS setup for ~189.00

Please correct me if I am wrong or missing anything.