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What should MAF read?
Posted: Mon May 04, 2009 4:09 pm
by Sql_RS4
I was wondering what should RS4 MAF read at VAG - mine does 270, I know highly tuned S4s in states show 300-330.
How about your rs4s
Also do you think it is possible that MAF on the way out may cause what seems like missfire at idle? It does not keep steady idle somehow and gets a bit shaky - sometimes more sometimes less.
I am trying to bring my B5 back to great condition, now I'm after all new bushes, new discs and pads all around, 710Ns, spark plugs, fluids, filters etc.
Thanks in advance!
Posted: Mon May 04, 2009 4:32 pm
by Spunbigendbearing
I've read that a standard RS4 would be 280-300 g/s with a healthy MAF;mine has a custom remap and went over 350 g/s.
Posted: Mon May 04, 2009 5:23 pm
by Nige_RS4
It is possible to clean your MAF using this product ...
http://www.maplin.co.uk/Module.aspx?Mod ... &U=strat15
This may be all that's needed to revive it? If not then you can buy the sensors on their own from
www.vastperformance.com
HTH
Posted: Tue May 05, 2009 4:18 am
by Doug_S2
if it is not in limp mode it is time for a new maf.
Posted: Tue May 05, 2009 7:30 pm
by sfrs4
just looked on the vast performance site and noticed that they do a hitatchi maf replacement for the standard bosch item, question is this a direct replacement just wire up and drive or does it need remap or more? has anyone tried it and is it any good?
http://vastperformance.com/shop/product ... ucts_id=31
Posted: Tue May 05, 2009 8:24 pm
by Nige_RS4
sfrs4 wrote:just looked on the vast performance site and noticed that they do a hitatchi maf replacement for the standard bosch item, question is this a direct replacement just wire up and drive or does it need remap or more? has anyone tried it and is it any good?
http://vastperformance.com/shop/product ... ucts_id=31
IIRC this is for S4s as the housing is smaller than the RS4 MAF.
Posted: Tue May 05, 2009 9:08 pm
by neckarsulm
This is my MAF reading for my standard 104k mile RS4 (to save you calculating it peak MAF of 310g/s = 387.5 bhp)
rpm maf
3920 177.53
4400 203.06
4920 232.08
5440 252.39
6000 287.53
6520 310.53
Posted: Tue May 05, 2009 10:38 pm
by jimbo1234567
i get about 420-430
Posted: Tue May 05, 2009 10:42 pm
by neckarsulm
This is my MAF reading for my standard 104k mile RS4 (to save you calculating it peak MAF of 310g/s = 387.5 bhp)
I hope to get to 120,000 (miles)
Posted: Wed May 06, 2009 12:06 am
by jimbo1234567
i hope to get 12 mpg
Posted: Wed May 06, 2009 8:36 pm
by Sql_RS4
Thanks guys. New MAF is on the way - ordered the OEM from my local Stealership.
I felt it was a bit slower, was thinking my ass just got used to it but if it shows 270 top then I guess it less powerful now, cannot wait to fit new MAF and see if dead hps will be back!
It is hard to admit but my friend managed to beat the sh*t out of me with his new M3 recently while I used to be faster each time we tried to race earlier.
Posted: Sun Aug 16, 2009 5:19 pm
by missmouse
whats this g/s unit ? & how do I measure it
Posted: Mon Aug 17, 2009 5:39 pm
by jimbo1234567
gramms per second of airflow. you need a vagcom lead and a laptop
Posted: Mon Aug 17, 2009 6:28 pm
by missmouse
ok, I have both! although just the free version which im told cant do much?
Do I have this plugged in while the car is driving then?
I assume I go to "engine"?
Posted: Mon Aug 17, 2009 7:06 pm
by Nige_RS4
I assume I go to "engine"?
Yep, engine, then log block 003 if you can - then go WOT from 3k rpm to the redline in 3rd gear. Save the log and import it into Excel.