£xxx for an all in MAF conversion

[Turbo-Brown]

My MAF unit cost me about Ԛ£15 from a breakers (you don't need a new one, a 2nd hand one will do as there's nothing in it to break). A 2nd hand Unichip is easily found on eBay for Ԛ£100.

Bexleys charged me Ԛ£200 for mapping.

So, Ԛ£315 is all you really need to spend. It's worth it for the throttle response alone as Karan says.

Actually there is: The film is supposed to go through a cleaning cycle every time you switch on and switch off which involves it glowing red hot for a second or two. Obviously they'll only take so much of this so eventually they do 'wear out'

Be interested to know if the cold starting problems people talk about with this conversion are down to the sensor not doing this.

[Ant]

the cold start issues seem to come from the lack of IAT on this setup, the ealrier e36 did run a seperate IAT sensor in the airbox, obv the stock AFM has one "built in"

Cant help thinking its an oversight to not use one, air temp/density are closely related , and even with a MAF its still speed-density metering so I'd say it was a must have item.

even if coolant temp was used as ref, and a nominal vlaue for the IAT tables generated its still not gonna be 100%

The Unichip can use a MAP in place of the MAF for load info, I have seen a few installs done this way.

[Stevin]

Ok, over here the guy s run S50 MAF... and they r very happy with them.

Why u guys only running 323i ones ?

[hoshy]

If we can offer restrictionless wth MAP instead then I'd guess that's a better bet.

Ant, you map in map,tps and lambda? I guess that would require retrofit of lambda on some cars which will put up the price. hmm. choices.

[Karan]

the cold start issues seem to come from the lack of IAT on this setup, the ealrier e36 did run a seperate IAT sensor in the airbox, obv the stock AFM has one "built in"

Cant help thinking its an oversight to not use one, air temp/density are closely related , and even with a MAF its still speed-density metering so I'd say it was a must have item.

even if coolant temp was used as ref, and a nominal vlaue for the IAT tables generated its still not gonna be 100%

The Unichip can use a MAP in place of the MAF for load info, I have seen a few installs done this way.

i agree..... some temps do suit my car a lot better and sometimes it flies a lot more thwn other times... and its not just cos sometimes its cooler... its a very slight difference that most ppl wouldnt notice... but i do cos of the amount of time i drive the thing

m5 runs an IAT int the airbox as ant said also

[hoshy]

the cold start issues seem to come from the lack of IAT on this setup, the ealrier e36 did run a seperate IAT sensor in the airbox, obv the stock AFM has one "built in"

Cant help thinking its an oversight to not use one, air temp/density are closely related , and even with a MAF its still speed-density metering so I'd say it was a must have item.

even if coolant temp was used as ref, and a nominal vlaue for the IAT tables generated its still not gonna be 100%

The Unichip can use a MAP in place of the MAF for load info, I have seen a few installs done this way.

i agree..... some temps do suit my car a lot better and sometimes it flies a lot more thwn other times... and its not just cos sometimes its cooler... its a very slight difference that most ppl wouldnt notice... but i do cos of the amount of time i drive the thing

m5 runs an IAT int the airbox as ant said also

presumably it runs best at the air temp/density that it was mapped at?

[Karan]

the cold start issues seem to come from the lack of IAT on this setup, the ealrier e36 did run a seperate IAT sensor in the airbox, obv the stock AFM has one "built in"

Cant help thinking its an oversight to not use one, air temp/density are closely related , and even with a MAF its still speed-density metering so I'd say it was a must have item.

even if coolant temp was used as ref, and a nominal vlaue for the IAT tables generated its still not gonna be 100%

The Unichip can use a MAP in place of the MAF for load info, I have seen a few installs done this way.

i agree..... some temps do suit my car a lot better and sometimes it flies a lot more thwn other times... and its not just cos sometimes its cooler... its a very slight difference that most ppl wouldnt notice... but i do cos of the amount of time i drive the thing

m5 runs an IAT int the airbox as ant said also

presumably it runs best at the air temp/density that it was mapped at?

yeh

[rowemeister]

Without jacking the thread!!!!

I would like to know how much people have paid for their second hand MAF and where it was purchased from.

This may help a few people out.

I have been quoted Ԛ£82.25 for a tested MAF from a local BMW breakers

[E30Adam]

I paid about Ԛ£50 for mine from Quarry Motors Brent. This included postage.

With rgards to the lack if IAT, I've butchered a AFM and removed the IAT and checked it's resistance values which still seem okay. I've now fitted it neatly into the rubber elbow from my MAF to TB so this should hopefully eliminate the cold running issues. I can't see how to wire it up though. There has been some additional wiring done to fit my MAF and it doesn't seem to make any difference if I connect it to the old AFM connector.

Any thoughts?

[rowemeister]

Ԛ£50 is good.

Not sure why the IAT doesnt work unless the new MAF wiring breaks into the old AFM loom somewhere.

[hoshy]

The MAF will break in to the loom. as below.

maf -> unichip -> ecu

the unichip modifies the maf signal so that the ecu belives it's still running a normal afm... I believe the signal is different. one has a liner rise and the other has an exponential rise.

I could proably track down installation diagrams if they would be of help.

[Andy335Touring]

Does the Unichip have an input for IAT and the correction map to suit ?

I'm guessing that your IAT is wired to the old ECU or it is not wired to the Unichip ? The ECU might be trying to compensate for the input from the IAT but the Unichip now looks after sparks and fuel so the IAT is doing nothing ?

I think you need to trace the IAT wiring back to see where it goes ?

[rowemeister]

Hoshy wrote

The MAF will break in to the loom. as below.

maf -> unichip -> ecu

the unichip modifies the maf signal so that the ecu belives it's still running a normal afm... I believe the signal is different. one has a liner rise and the other has an exponential rise.

I could proably track down installation diagrams if they would be of help.

Yeah!! Diagrams would be good mate

[hoshy]

Hoshy wrote

The MAF will break in to the loom. as below.

maf -> unichip -> ecu

the unichip modifies the maf signal so that the ecu belives it's still running a normal afm... I believe the signal is different. one has a liner rise and the other has an exponential rise.

I could proably track down installation diagrams if they would be of help.

Yeah!! Diagrams would be good mate

I'll see if I can dig something up.

[rowemeister]

Hoshy. Any luck with those diagrams mate.

[hoshy]

Hoshy. Any luck with those diagrams mate.

Shit I'm sorry mate... I need to make the call during office hours so I'll set a reminder to do it Monday.

[E327UKL]

i paid bexleys Ԛ£1,087.20 for the following:

new air mass meter Ԛ£212.77
big tb Ԛ£120
airmass fitting kit Ԛ£25.00

now labour

supply fit and map unichip Ԛ£500
fit air mass meter Ԛ£45.00
replace throttle body Ԛ£22.00

all plus the dreaded Ԛ£161.93 vat

well impressed along with my other goodies produced 196.5 bhp and 177.0 ibft!

against my 325 cab it just leaves it standing! feels willing to rev and it does! a lot more responsive and revvier


RECOMEND!!!!!!


CAN I ROUTE A TURBO THROUGH THE AIR MASS AND WILL THE UNICHIP BE COMPATABLE WITH IT??

[hoshy]

Hoshy. Any luck with those diagrams mate.

As I said I need to call them but everytime I try it just rings out. I'm sure the number is right though. I'm going back home end of this month so I'll have a dig around then if you still need them mate.

May do a sample MAF or even MAP conversion whilst I'm at home to get an indication of cost , what's involved in making it work to see if we can come to a decent price to beat what it seems people are paying atm (and make my car go nicer or course)