GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: dstv on 11 October 2012, 19:44
-
Hi Guys
I have bought a new MAF for my car and the revs some times runs a bit crap..up and down up and down so I im thinking of getting a new one. I read on here of people talking about replacing the std maf sensor with a vr6 bigger one...how does it work..is it straight forward ? Any help would be great
-
unplug your 1 first see if it runs any better :smiley:
-
you need the car mapped to suit the VR6 MAF and also run bigger injectors. That's if it's an AGU of course
-
more info required here matey!
Larger MAF housings are only fitted when a larger turbo is fitted with the ability to max out the stock maf sensor in it's housing.
AGU engines will require the obd II VR6 sensor housing, with either the vr6 or the agu sensor.
ARZ/AUM engines will require the S3/LCR/TT sensor housing. there are also two different version of the sensors on the ko4 cars so check part numbers against your own. easiest thing is to fit your original sensor into the larger housing.
If you are on the stock turbo, or a ko3s on an AGU, the stock housing is fine and shouldnt be changed.
Any change in size of maf housing will require the car to be mapped again specifically taking this into account, as the CSA increase from a 70mm maf to an 80mm maf is a whopping 38%, meaning an 80mm maf on an unmapped car will underfuel by about 38%!
As a side note, if it's an AGU, the old test of unplugging the maf to test it doesn't really work well, as the AGU relies on maf 100% and hardly runs at all without it!
-
Every car seemsto be different too. I'm running 225bhp on my standard injectors and it starts to lean out at max bhp. Others have run 230bhp without needing to change injectors & MAF.
-
You use the 1.8T sensor in VR6 housing.
-
thanks for the info.. Ill stick to buying a std vw one then. Im running a ko3s AGU and remapped already. Ill save myself some money.