MAF-less

[Rusty]

What can do this? VEMS, MAXX ECU?

What do these use to remove the MAF?

With a new MAF looking like £300 and the connector being an issue, I'm interested in what options there are and what they entail? Having a customiseable ECU for future plans with full diagnostics is also of interest.

[martinws]

I think they run on a kind of efficiency table that just measures pressure and assumes flow is off a set table. Prj can do it on motronic.

[vti2]

If it is a Street Car stay with the motronic, for me the best sistem, just put a 95mm maf on it and tune it.

[newsh]

This is called speed density tuning. PRJ can do this on Motronic, mine is running like this at the mo although not finally tuned yet.. Basically you tune the VE (Volumetric Efficiency) table, MAP vs RPM.


You can do this with Vems or Maxx.

I was talking to Stuart at MRC yesterday about this, he says they've been down the Mafless route but have mostly gone back to the Maf for road cars. They do retune with bigger Mafs on higher power cars though.


I'm thinking of having a tweak of my VE table today after my disappointing track session yesterday

[vti2]

MAF is much more accurate thats why runs better on Street

[Rusty]

I know prj uses RS4 MAFs on bigger turbos, so that's a possibility but he's pretty much the last motronic man now.

[Rikki Kitto]

What about Automark bit of a trek up North like but closer than PRJ

[quattro-nick]

i dont have issues(maf-less) at all with vems on road or track

[diesel des]

Yea motronic is great on stock ish cars but when you have many mods the maf can be an issue. The biggest issue is someone else needs to tweek you settings. That's why I'm with vems. Idle isn't as perfect as motronic in all conditions but other than that its great. Idle once adjusted is v good just not motronic smooth. Vems biggest problem is it has so much to play with you can get lost and never leave it alone.

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[quattro-nick]

des,idle works well in vems if you take "ignition based idle control"
much more stable

[diesel des]

Yep I know that but with air con cold days hot days just started etc it isn't as good as motronic. It's not bad, just not as perfect.

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[Rocco]

I'm with MAF and Speed Density in my two Evos.

Both works great and without issues.

So I'm happy. Once you pass 400bhp is better to go speed density.

[Error404]

Without MAF ECUs use the MAP sensor and VE table with IAT to compute charge mass air flow. That's why it is so sensitive to any setup changes as even the slightest change to how any of those values are measured or delivered can throw the VE table out of calibration and mess up the AFR. Also recalibrating the VE table thoroughly is impossible without time on a proper loaded dyno.
I would imagine it's easy enough to rescale the MAF function IF you know how to recalibrate Motronic in that depth, hence why I think only Dmitri can do it. All good ECUs should have that functionality

[Rusty]

Can a WBO2 be used to correct things in real time?

[A80Avant]

Yep I know that but with air con cold days hot days just started etc it isn't as good as motronic. It's not bad, just not as perfect.

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What version are you running? Idle on my car is much better than motronic. Better than it has ever been.
Smoothness is a deception with motronic as it sits at 860rpm whereas with vems and any aftermarket you are always a bit higher.