Too rich fuel/air on turbo m30b34

[sabershark]

Hello. My original m30b34 1985 635csi ran too rich to begin with 6-8mpg

So last month I converted everything to turbo
Mustang turbo kit good on still China but a good one
255lp single intank Walbro pump
Injectors are 22lp just ordered 42lp
Turbo chip with retarded timing
Factory AFM (had not played with adjusting the gear inside)
Fuel pressure regulator set at 44psi
Fuel management unit (ran like crap so I disconnect it and it runs good now)

Now car start and runs good. The issue is on fuel air ratio meter it shoes 17 wich is too much it should be 14.7

The rpm is 1200 on cold and when fully warm

Question what the hell ?
Is it afm needs adjusted or its because I run factory dme with chip
How do I adjust a fuel to air ratio ? Through afm? Or ?
Let me know. It's my first time

[ron]

LOCATION in your profile please.

[GazM3]

If u were gerting 6-8 mpg before turbo is u probably had issues with something beforehand.

Geez if 17:1 air fuel anywhere except on deceleration your engine and head gasket won't last very long.
I'm currently tuning my 540i with supercharger and have 14.7 on idle mid 13's in light throttle richening up to mid 11's at full throttle st the top end.

To tune u need some sort of adjustability over the ecu. At the very least u will need a chip for forced induction to take some timing out and for a fuel curve.

A good rule of thumb on injectors is look at the current capacity of them say 19 lb/hr and assess the boost u are going to run say 1 bar and u would need to allow a little headroom as forced induction likes a richer mixture than Nat aspirated. So 42lb/hr will be on the money. U can run a slighly smaller injectors say 32-36 lb/hr if u run an adjustable fuel pressure regulator so u can use fuel pressure to do wholesale changes to air/fuel ratio.

The other issue will be the airflow meter and the capacity it can read. I'm not sure of the limits with it but I'm seeing about 90% capacity on the airflow meter with my approx 300bhp m635. Once starting to over say330bhp u may run out of airflow meter capacities where the ecu will see over 5v which will cause at best like an early rev limiter but at worst the ecu will fail to make adjustments and will lean out just when u don't want it too.

The only real solution is an effective standalone computer so u can control all this stuff.

If it was a later model u could probably just get away with some sort of adjustable interceptor on the fuel signal (like I have on the 540i).

Good luck

[sabershark]

LOCATION in your profile please.

Seattle

[ron]

IN YOUR PROFILE!

[tschultz]

If you don't know how to track down excessive fuel consumption, how the heck did you turbo it??

There could be lots of potential issues but as hinted already, you need to confirm what motronic settings were already confirmed to be working.

With my RRFPR and turbo using Motronic 059 Ecu the car ran exactly like a stock car except above 0psi intake pressures.

[sabershark]

If you don't know how to track down excessive fuel consumption, how the heck did you turbo it??

There could be lots of potential issues but as hinted already, you need to confirm what motronic settings were already confirmed to be working.

With my RRFPR and turbo using Motronic 059 Ecu the car ran exactly like a stock car except above 0psi intake pressures.

I knew my bmw uses more gasoline then it should but never paid attention b3cse I drow it 5 times a year.

After the turbo install the air fuel ratio gauge was installed that's when I noticed the improper ratio. Above 17.

Here is what I got
As soon as I removed fmu fuel management unit the car ran great. Still 15 at fuel ratio
Rpm 1200 too high
The member of bmw told me to play with the afm sprin gear.
The other is to replace afm with maf and e34 harness.
Need to know who did e34 harness conversion
What do I need to buy to make a conversion

[tschultz]

No reason to go M1.3 unless you are going Megasquirt.

What is your goal here for the car?

[sabershark]

No reason to go M1.3 unless you are going Megasquirt.

What is your goal here for the car?

Jus to to gain 40-50hp

[GazM3]

Personally unless I had some way of controlling the fuel I would not bother with using Oem product. U can get a cheap mega squirt or other and then have full control. Even better would be to install a haltech or link ecu one that will run closed loop wideband sensor/s so all u do is type in the desired air/ fuel values and it will sort the fuel injectors duty for you.
Then all u have to do is sort timing. There are a few base timing maps for turbos on mye28.com.

A good setup turbo on m30 can make an easy 400bhp on std internals. Optimise the exhaust manifold and turbo and people are getting 550+.

[tschultz]

Personally unless I had some way of controlling the fuel I would not bother with using Oem product. U can get a cheap mega squirt or other and then have full control. Even better would be to install a haltech or link ecu one that will run closed loop wideband sensor/s so all u do is type in the desired air/ fuel values and it will sort the fuel injectors duty for you.
Then all u have to do is sort timing. There are a few base timing maps for turbos on mye28.com.

A good setup turbo on m30 can make an easy 400bhp on std internals. Optimise the exhaust manifold and turbo and people are getting 550+.

Right.

For only 50hp, the best bet would be to stick with M1.0, and add a RRFPR like the BEGI 2025 (I had this setup and picked up 5-7 seconds at the local road course).

Here's my car with a similar setup as I follow a stripped out 535i (car prepared for 24 hour Lemons racing). https://youtu.be/WIkIKwFw9q0?t=10m55s

View from his car as I went for it and pulled away: https://youtu.be/b_H6WyxVDhU?t=23m02s

[sabershark]

So after I installed 42lb fuel injectores
A single intank 255lp cheap fuel pump
A adjustable fuel pressure regulator

Started great. Rpm steady 750, fuel air 14.7

Then after rawing up the gas pedal the car stared to bogout and choke under the load. Let of gas the car runs as soon. As I stepped on gas quickly it dies.
The fuel pressure gauge went from 44 to 20 to 10 then to 0.

I thought my fpr shit the bed so I installed the old one factory still the same. So I rented a fuel pressure check system. Before the rail 0psI. After the rail 0. After the fpr 0.
Question did my fuel pump went south ? Since it's $20 knock off Walbro. ? Hope I did not burn the pistons

[GazM3]

hehe u are determined to blow this engine up.

If there is zero fuel pressure either a massive blockage or no pump. The e24 has an in tank pump as well as a high pressure pump.

Geez u want to have a stable fuel system with boost. Good fuel pumps are not expensive so prob should not scrimp in this area.

[hornhospital]

I thought my fpr shit the bed so I installed the old one factory still the same. So I rented a fuel pressure check system. Before the rail 0psI. After the rail 0. After the fpr 0.

Was this after you put the old pump back in? I'd say you have no power to the pump if both show 0 psi.

[sabershark]

Replaced the fuel pump with real Walbro 255lp. And it fixed the problem. What is the proper fuel pressure for the factory bmw m30b34?