m30 AFM duse it work

[bmw1066]

Just looking at diffrent things and what can be dun and all that. Duse a M30 AFM do anthing is it a good mod or not worth it?? Jout out off intrest

[AndyG]

Mark

this for the M20 320.

[GrindCulture]

There's a guy round here who's seeing about 180+bhp from his M20 with an M30 AFM. e301988325i is his name on here.

[bmw1066]

No Bord at work lol And just jen intrest in the m20 and seing what can be dun LOL, I don't mined having a play around. If and when I get time.

[bmw1066]

There's a guy round here who's seeing about 180+bhp from his M20 with an M30 AFM. e301988325i is his name on here.

Cool

[AndyG]

you must have an m30 afm sitting about, why not give it a go?

[charlE30]

If I remember rightly you swap the internals over from the M20 AFM so that the ECU reads it correct, I think the signal might be different on the M30. It was a long time ago that I read about it, there is an American site on the net that goes into great detail.. I haven't got the site address.

[bmw1066]

you must have an m30 afm sitting about, why not give it a go?

I have AG lol but it's a old one and the others I gave to Philip.

[bmw1066]

If I remember rightly you swap the internals over from the M20 AFM so that the ECU reads it correct, I think the signal might be different on the M30. It was a long time ago that I read about it, there is an American site on the net that goes into great detail.. I haven't got the site address.

Yer there is a lot off conflicting stuff about some say it's a swop some say it's not good but can be adjusted, or the ECU sort's it out.

[reggid]

The M30 unit is calibrated for the M30 engine........its hit and miss as to whether it will run anywhere near as good as a properly maintained M20 unit. Tuning is precision stuff why take all the precision out by using the M30 unit, if you are getting a remap afterwards then it will work fine (i have done this). If you want a better system than the M20 AFM ditch it all together IMO and use a MAF or MAP.

[dannyboy759]

http://www.davelength.net/car/bigsix.html

Thats what you need

[bmw1066]

http://www.davelength.net/car/bigsix.html

Thats what you need

WOW that's great thanks . I will be intresting to see how much power I couldf ge out off the 320 lol. befor going 2.7

[bss325i]

I wouldn't bother.

Alpina used a standard AFM for the 2.7 engine.

[bmw1066]

I wouldn't bother.

Alpina used a standard AFM for the 2.7 engine.

Just because it was not good enouth for them LOL

As it has been seen to work on that guy's e30 then I have nothing to lose.

It also makes good sence as the m30 AFM is bigger now if all this is Dun along with other mod's then It is worth it as any power gain is good no matter how small.

And if it don't work I will just put it back to standard I'm doing the work so it's going to cost a very small amount

[bss325i]

I wouldn't bother.

Alpina used a standard AFM for the 2.7 engine.

Just because it was not good enouth for them LOL

As it has been seen to work on that guy's e30 then I have nothing to lose.

It also makes good sence as the m30 AFM is bigger now if all this is Dun along with other mod's then It is worth it as any power gain is good no matter how small.

And if it don't work I will just put it back to standard I'm doing the work so it's going to cost a very small amount

Alpina didn't use it because they didn't need to just like they didn't need uprated injectors.

It will not work if you just plug it in and will probably make the engine run rough.

[zaust]

Can't belive this is still going. If you think your afm is slowing you down then as above ditch it for maf. Advice would be to make sure there is still 3 ohms of resistance in it of which both unit's run at. the butter fly is not any different on either so running a m30 to a m20 item will make sod all difference one set up properly.

[bmw1066]

Can't belive this is still going. If you think your afm is slowing you down then as above ditch it for maf. Advice would be to make sure there is still 3 ohms of resistance in it of which both unit's run at. the butter fly is not any different on either so running a m30 to a m20 item will make sod all difference one set up properly.

Fear doo's but it must make a diffrence or People wond nmot do it?

Thanks for the head's up

[bmw1066]

I wouldn't bother.

Alpina used a standard AFM for the 2.7 engine.

Just because it was not good enouth for them LOL

As it has been seen to work on that guy's e30 then I have nothing to lose.

It also makes good sence as the m30 AFM is bigger now if all this is Dun along with other mod's then It is worth it as any power gain is good no matter how small.

And if it don't work I will just put it back to standard I'm doing the work so it's going to cost a very small amount

Alpina didn't use it because they didn't need to just like they didn't need uprated injectors.

It will not work if you just plug it in and will probably make the engine run rough.

I know were your cuming from but just becaust thay did not do it don't mean it wont make it better. As for the injector it makes a diffrence on the M30.

I also know it's not pulg and play but that is why the guy swoped over the m20 insides to the m30 AFM casing.

Thanks all the same as I know naff all about the m20 witch is why I ask the question's But I'm getting there. It's hard as so many people have diffrent veus on what is good and bad mod's

[zaust]

Removing the water pipes from the throttle body will give you more of a gain for free and a big bore throttle body will give you result's. The afm is a metering unit not a inlet as such. Any one who tells you it made a difference had a badly set up afm.

[bmw1066]

Removing the water pipes from the throttle body will give you more of a gain for free and a big bore throttle body will give you result's. The afm is a metering unit not a inlet as such. Any one who tells you it made a difference had a badly set up afm.

Great thank's, well on a 20 year old car it may worth checking or getting a new good one then, 500+ for an m30 one for the e23

[rix313]

Sorry but it's DOES

[AndyG]

what make a difference?

I believe Alpina didn't change the injectors in the M30 though as the flow is good enough for the what the B10/B11 produces. However I'm not 100% on that but mine are std BMW injectors and now its set up its perfectly ok for the B10's 260 odd horses (or whatever its producing now).

[hoshy]

I wouldn't mind betting the only reason that guy saw any benefit was due to increasing the fuel across the board. In any case the power increase in that article is no more than you'd get for a 50 quid chip. Or for that matter no more than you'd get from driving it on a very cold morning

[e301988325i]

http://www.davelength.net/car/bigsix.html

Thats what you need

I read this article before I converted mine.

The reason his worked so well is because his ECU can monitor and adjust the fuelling through the lambda sensor, fitted as standard to his car.
How many UK E30s have this?

The 320 and 325 AFM are the same, It isn't a restriction on the 320.

i) I tried the M30 AFM on the standard chip, it didn't work and was lean, so I gave up.

ii) Then I bought and fitted the latest chip from Evolve, it overfuelled to hell and ruined my plugs on the standard AFM.

iii) Knowing it was running rich I tried the M30 AFM again, this is more like it.I havn't swapped the internals around, but have loosened the spring 8 clicks on the plastic wheel inside the M30 AFM.

iv) When the car was dynoed it was running a little lean at the top end so I've upped the fuel pressure a bit now.

The car is fine now and makes good power everywhere!

[bmw1066]

http://www.davelength.net/car/bigsix.html

Thats what you need

I read this article before I converted mine.

The reason his worked so well is because his ECU can monitor and adjust the fuelling through the lambda sensor, fitted as standard to his car.
How many UK E30s have this?

The 320 and 325 AFM are the same, It isn't a restriction on the 320.

i) I tried the M30 AFM on the standard chip, it didn't work and was lean, so I gave up.

ii) Then I bought and fitted the latest chip from Evolve, it overfuelled to hell and ruined my plugs on the standard AFM.

iii) Knowing it was running rich I tried the M30 AFM again, this is more like it.I havn't swapped the internals around, but have loosened the spring 8 clicks on the plastic wheel inside the M30 AFM.

iv) When the car was dynoed it was running a little lean at the top end so I've upped the fuel pressure a bit now.

The car is fine now and makes good power everywhere!

Great thanks, It's good to hear form some one that has fitted and tested it out.

[reggid]

using a larger AFM or deleting it improves performance but the ECU must be properly calibrated so that it gets proper signalling so it can get the BOTH timing and fuelling correct. The M30 AFM swap is hit and miss.

The results on davlength aren't purely the result of the AFM swap......... He had larger injectors installed and then ran the M20 AFM on the dyno and swapped the M30 one. It would have been more correct to run the M20AFM with std injecftors and then M30 AFM with M30 injectors. Whats to say that M20AFM and M20 injectors wouldn't give the same final numbers especially since there is no AFR on either dyno plot to know whether the car was fuelling anywhere near correct.

[e301988325i]

As stated before, his car uses the lambda sensor to adjust the fuel mixture.

[hoshy]

Remember the lambda sensor makes no difference under WOT though.

[reggid]

also ignition timing is probably more important anyway

[dannyboy759]

Just like to point out that i also read this article abnd to be honest its a lot of messing around!
Also like has been said Alpina didnt see the need to change it on their cars so read into that what you will, but on the other side AFM's are very restricive in what they do and the M30 AFM is consideralbily large than the M20 one so it cant be a bad thing.
With regards to the Alpina theory nothing is as good as it can be plus When they developed the car they couldnt revise everything just not the time or money.
But at the end of the day is probaly not worth it!