2.5 and 2.0 air flow meters

[johnono]

sounds stupid but is the 2,5 afm a possible replacement part on a 2.0

[E30Adam]

Not really. If you mean as an upgrade, this was tried with an M30 AFM on a 325 and it lost me 11bhp on the rollers.

I'd say stick to the stock one unless you're going MAF or MBE

[johnono]

ok, cheers ad

but do they line up , as in inlets and so on are the same size or not?

[Davenotouring]

They do line up mate yes.

I've got a 2.5 one on mine at present.

Not as in a power increasing mod, but because I was trying to solve a running problem. Runs ok with it on, but I suspect it's causing over/under fuelling.

[johnono]

do u get the flat spot still with the 2.5 afm

[Davenotouring]

Yes mate.

Around 4.5 to 5.5k rpm.

In that area.

A chip should solve this.

Speak to ANT!

[johnono]

o, mines fine up there

i just get the hessitation with a quick jab of the accel.pedal when im at idle

what dyo reckon it is?

and im sure weve had this chat before

[Davenotouring]

Oh right, I used to have that. After playing around with loads of bits, it's much much better now.

I am currently running a 2.5 AFM, but changing to a borrowed 2.0 made NO difference in running.

I also tried numerous ICV's and none were any better than the other.

I am currently running a 2.5 ECU. This has stopped the momentary flat spot when you go to pull away at a junction etc.

I can only assume the old ECU was faulty, or something cured itself.

[johnono]

aha, would a 2,5 chip be a bad idea with a 2.0 afm

[Davenotouring]

A 2.5 chip would be pointless really.

I would go back to fully operational 2.0 stuff if I could, that's if I was staying 2.0, and if I was, I'd get a zone chip. But I'm going 2.5 so this will suffice for now! It runs!

Go for a 2.0 Zone chip I reckon.

[johnono]

sweet dave, ive got ants email, as soon as i am on it ill get sorted

[Ant]

ahh, the stumble just off idle is normally down to a shagged/dirty TPS dude, either that or your throttle cable is poorly ajusted.

check the operation of the TPS before spending out £Â£ M8

[johnono]

ant, there is abit of slack on my acc. cable, but the pedal feels fairly responsive, can i adjust it myself

idle normal after warmup 6-7

before warmup 10

[Ant]

yeah just tweak it til the slacks all gone, then check it goes full open/closed when operated via th pedal, get loads in @ work that only give 3/4 off WOT with slack cables dude

TPS stil needs checking though M8, the cold start idle is down to a coolant temp sensor signal to the ECU

[johnono]

sweet ant give it a shot on the cable slack, changed the blue and brown when i first got her but needs a set of filters and a spark change

[Demlotcrew]

good thing about the M42 is that it has auto learning TPS.