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Anybody know where I can get a mafless tune in uk?

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mafless tune uk
3K views 23 replies 7 participants last post by  bwchiptune 
#1 ·
Hi I've got a e46 330ci supercharged and have had a lot of problems due to the maf, I bought a new oem maf and it lasted a few weeks, the trouble I'm having is that due to the increased air going through the maf it goes beyond the range of the maf.. So after hours and hours of online research I've come to the conclusion that I need to run mafless.. I'm currently running it with the maf unplugged but have heard that the m3 csl runs alpha n mafless software but can't find any info on 330ci's

Can anyone shed some light?

Thanks
 
#4 ·
as said above have a chat with some experts ie enda and ca auto as i've seen enda change my maf settings on my supercharged IS to use the bigger 325 maf so i have no idea what would be bigger but another maf from somewhere else in the bmw stable may be a solution

i spoke to a lot of places about mapping mine etc and there isnt a lot of places willing to tune FI cars that arent meant to be that still have stock engine management
 
#7 ·
Thanks for the help guys, ill try ca.. I don't know if it helps but the supercharger is an ac schnitzer.

Is it going to do my car any harm by running it mafless in the mean time?

Cheers
 
#11 ·
Nope, there's too many variables at this point. On something boosted, it's best to have something watching the airflow. The MAF is the main input for most of the ECU's calculations, so boosting it and running it Alpha N (where it'll be forced to estimate the airflow) could easily end up with a melted engine.
ACS should have had it well tested before releasing, and it should be spot on. They'll have had access to full engine dynos and loggers and it should be calibrated very well.
 
#13 ·
No the pulley hasn't been modified at all, I have sent the new maf back to manufacturers to be tested and will wait until that comes back.. If its faulty then i know it's the maf and if its not faulty then there obviously is another problem.

Could faulty lambda sensors affect anything as these haven't been checked.. Hmmm?
 
#14 ·
The reason I beleive it is the maf is because after installing a new one, the car ran perfectly for a few weeks.. Then in the high end of revs the yellow light (emissions light?) would flash up and then disappear when the revs dropped after changing gear.. Which would then be followed by the eml lights and limp mode.

Running the car with the maf unplugged, the light is permanently on and the car runs fine, although I'm led to beleive that it runs on a safe map?
What I'm hoping to do is sort the problem out.. I've checked for vacuum leaks and everything is as it should be so any advice would be very much welcomed :)
 
#17 ·
You want to get hold of INPA, from ebay.
It's a USB lead and diagnostics software that will read your fault codes and tell you the reason your car was holding back the power.

The cost is about £20-ish, and you'll get better diagnostics than most garages. It's nothing fancy to look at (it was used internally by BMW for car testing and on the production line) but it's good stuff.
 
#18 ·
I will give that a go then thanks for your help :)

Quick question - with my current setup (after everything is sorted) the car is running 300bhp according to the ac spec.. Is there anything I can do to up that?

Cheers will
 
#19 ·
I think you might struggle, as it is probably an Eaton supercharger which is bolted straight onto the manifold. An intercooler would have helped, but there isn't a way of getting one between the charger and the engine.

A smaller pulley will increase your boost pressure, and that should give you more power, but too high and it'll need retuning down for safety.
 
#20 ·
It's a centrifugal s/c which runs pipe work into the boot which comes off the throttle body.. I think, with some custom piping an intercooler could be fitted, although would I see much gains for the money? I've also read up about alcohol injection but not too convinced that spraying water into my intake is such a good idea..

I think the charger runs at around 5psi at the moment so when you say 'too much' how much could it run safely.. And I guess I would have to have it mapped to accommodate the extra boost?

Cheers
 
#21 ·
Ah, centrifuges are easier, as you can see you have the extra space to get a cooler fitted.
5psi is pretty lightly boosted, you should be able to handle 7psi (most engines can do that) but an intercooler will start to get more important.

At 7psi, you'd probably be running at 330bhp, and depending on how safe ACS have played it with your ECU, it would probably handle it fine, especially with a i/c fitted.

The tricky bit is knowing what you have at the moment, how "tuned" it is from ACS, how much space is left in the injectors etc.
 
#23 ·
As far as I know it was converted from new according to the previous owner. Also as far as I know it's always had this problem as the car had been in a specialist to diagnose the problem many times without success. According to the receipts they even changed a gearbox wiring loom.

If you could give me a rough price then I could consider it, although London is quite a distance from me

Cheers
 
#24 ·
It would be hard to give you a price to fix the problem without having the car here

I would 1st need to spend 1-3 hours looking at the car to see what it's doing

What's dose the face plate on the rocker cover say if it's original convertion it should have one

Was it converted to manual?
Where did you by the car from?

I have made a few replacement ecu'a for these super charged acs cars

Can you send me reg number and chassis to see if I have any history on the car
 
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