Stock ECU MAF replacement project

[prj]

Since the stock MAF is getting more expensive all the time (270 EUR at the time of writing), I thought perhaps it could be a good idea to make a MAF conversion kit for standard cars.

The kit would consist of:
1x Bolt-in Hot-Film MAF, which will fit directly instead of the stock item without modifications to intake.
2x ECU Chips
1x Connector and fittings
1x Instructions

The fitting would mean that the connector would have to be changed.
The chips would be standard good Stage 1 software for a stock car. 1.4 bar boost with good timing.

The price I am aiming for is ideally about the price of the MAF at the dealer. So around 300-350 EUR.
If the hot-film MAF ever breaks, then it would be possible to replace it for around 100EUR at the dealer with an exchange part.
The hot-film MAF is more reliable, it is possible to clean it with Q-tip and alcohol and it also gives less flow restriction.

Now, I am not sure if there would be much interest in this, but I thought I'd throw this up here.
The kit would be ABY/AAN (possibly ADU) only. The 3B ecu is too slow to deal with the hot-film MAF.

[S2central.net]

Glad you agreed that bolt-in version of this is the best way to go for most folk - its a nice way to go for anyone that fancies an ECU upgrade along with a 'bomb proof' MAF.

Robustness of HFM vs MAF plays better with big power engines - like in excess of 400-420bhp ish... needing custom coversions of course and the possibility of going with larger housings as well.

[prj]

Glad you agreed that bolt-in version of this is the best way to go for most folk - its a nice way to go for anyone that fancies an ECU upgrade along with a 'bomb proof' MAF.

Yep, but I had to develop the "big" version first

Robustness of HFM vs MAF plays better with big power engines - like in excess of 400-420bhp ish... needing custom coversions of course and the possibility of going with larger housings as well.

Yes, but for those engines they will need a bigger MAF and a custom tune, custom intake etc.
The bolt-in MAF would max out around the same flow as the stock MAF, and it would run on AAN software, so it'd be impossible to map properly for higher power levels (last cell tuning all over again).

For that I'd have the larger MAF conversion, but it's not something that I could/would ever sell as a kit (needs custom dyno tuning, as you said).

[S2central.net]

Agreed on both counts.

[prj]

It's mainly so that when your MAF breaks, you can have a nice chiptune for your car and a new MAF for an attractive price as a package.
That's what it's aimed at. People who have a working maf and a stage 1 chip, would not have anything to gain by it - until their maf breaks

[Thuppu]

Hmm, my MAF just gone bad(at least it seems that way). But have to find a used one, neet to do the big maf conversion soon anyway.

Prj, have you tested Golf VR6 MAF's? http://www.s2forum.com/forum/showthread.php?t=35691

[prj]

Hmm, my MAF just gone bad(at least it seems that way). But have to find a used one, neet to do the big maf conversion soon anyway.

Prj, have you tested Golf VR6 MAF's? http://www.s2forum.com/forum/showthread.php?t=35691

No I haven't, and I am not interested in testing any MAF's, since I already have the solution for both big turbo cars and stock cars.

[Thuppu]

Ok, of course.

Your offer is really nice. Getting the car chiptuned and you get a new(and better than stock) MAF in the same deal. Not bad, since here in Finland a engine chiptuning is usually 400-600e and with that you don't even get custom dyno tuning. Dyno tuning is 800-1000+e.

How much would you wan't if you came here to Finland for custom remapping? Or I came there? Do you live in Estonia? Near Tallin?

[mouse]

Having just replaced my MAF, I don't expect to need a new one for a while - and they can be bought from the place mentioned here: http://www.s2forum.com/forum/showthread.php?t=36426 for £150 .

But while your hot film MAF kit would be good for someone still running stock chips, I think it would be much more popular if a film maf could be found which could directly swap with the stock maf without requiring a remap.

I understand this may difficult (or maybe even impossible) to do but probably most people on here already have a remap, and some of these are custom maps, so many people would not want to get rid of their tried and tested chips when replacing their maf.

[S2central.net]

You cannot swap from MAF to HFM without some trickery from prj - he cracked the code on how the air mass scaling works. Even to keep engine in factory tune with 230bhp you would the clever code inside the Ecu.

[prj]

Ok, of course.

Your offer is really nice. Getting the car chiptuned and you get a new(and better than stock) MAF in the same deal. Not bad, since here in Finland a engine chiptuning is usually 400-600e and with that you don't even get custom dyno tuning. Dyno tuning is 800-1000+e.

How much would you wan't if you came here to Finland for custom remapping? Or I came there? Do you live in Estonia? Near Tallin?

PMing...

I understand this may difficult (or maybe even impossible) to do but probably most people on here already have a remap, and some of these are custom maps, so many people would not want to get rid of their tried and tested chips when replacing their maf.

I know a thing or two myself when it comes to remapping these engines
Plus, as Paul said, what you are saying is not possible without a rewrite of the MAF handling code in the ECU anyway.

Also, the thread you linked - the site in that thread doesn't work. Maybe a temporary thing of course.

[mouse]

Fair enough - thought it was worth asking the question.

the http://www.emissioncontrols.co.uk/ site is back online again now - might be a good source for the hot film maf you need.

[prj]

Fair enough - thought it was worth asking the question.

the http://www.emissioncontrols.co.uk/ site is back online again now - might be a good source for the hot film maf you need.

Thanks

[prj]

TODO:
* Find cheap 80mm diameter bolt-in HFM5 MAF
* Source connectors
* Map car on the dyno
* Detailed installation instructions

DONE:
* Rough Installation instructions
* Software support in ECU

The translation of the "new MAF values" to "old MAF values" has an error less than 0.7% in the entire range and less than 0.3% in the majority of the usable range.
It is quick enough to rev to 7300 RPM, have not tested higher yet.

[prj]

Paul... or someone else...

Do you know if a Male 6 pin connector exists that would plug into the connector for the old MAF (RS2)?
That way cutting off the connector could be avoided and only one wire would need to be soldered. This would simplify installation a lot and also allow the old MAF to be fitted back easier if the need should ever arise.