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i rolling road'd the rs4 and got 395, got told i should have 450 ish from the last owner, it was running a bit rich, i checked the air filter and it was blocked to crap! so i have a new one and its running much better but should i be concerned i got a reading of 351.7 gs as i hit the limiter in second but im not sure what it should be! or even how to do the readings properly. i could get a print out of the car if it helps!!

thanks for you help in advance im new to the vag world!!

g/s is .8 bhp (roughly)
so divide 350 by 4 then time by 5

87.5 x 5 = 437.5 bhp (approx)

If the last owner talks bhp but has a blocked air filter I'd take his estimate with a pinch of salt

neckarsulm wrote:g/s is .8 bhp (roughly)
so divide 350 by 4 then time by 5

87.5 x 5 = 437.5 bhp (approx)

If the last owner talks bhp but has a blocked air filter I'd take his estimate with a pinch of salt

thanks, the last owner was genuine enough and it is due a service anytime now. if its 437.5 ish a propper service might get it near on the 450 ish

how is it your know maf gs = bhp power ?

I'm not sure where it originated but it seems to be quite accurate.
Anyone know?

is it possible to check if MAF is working properley with VAGCOM, if so could someone explain how please.

rtd wrote:is it possible to check if MAF is working properley with VAGCOM, if so could someone explain how please.

Yes, but you either need a known good log or post your state of tune and remap type. If you are stage 3, then you should be maxing out the MAF reading on vag-com = 464.08

Vag-com > engine module > measuring blocks > block 003 > Log > Start.

Use 3rd gear 3500 - 7000 rpm.

Save file and post results here.

HTH

what is this vag-com? i have been using a techie snap on tool that logs about a million things as u drive lol!

maxrs4 wrote:what is this vag-com? i have been using a techie snap on tool that logs about a million things as u drive lol!

The snap on tool is good, but not as good as vag-com!

Do a search on google for it - lots of info.

Nige my car is standard at the moment

rtd wrote:Nige my car is standard at the moment

A std RS4 will see between 280 and 300 g/s on the MAF IIRC.

Apperently i maxed the new maff fitted saturday,Grizz said.
Didn't know what the hell he was on about,but it sounded good

I have just changed my MAF - was also down on power.

Old one peaked at 270 g/s

Brand new from Audi showed 320 g/s today but I feel the car is still slower than it used to be and cannot find out why.

We checked boost with my friend today and it acts weird - car wants 2.4, boost is much lower, then it goes up to 2.3 when it is 2.3 expected by car, keeps it and then looses a lot and goes down to like 2.0

I no longer have that kick in the @ss that used to be there at around 3750-4000 rpms - it is more smooth and linear now.

Any ideas? My mechanic said it might have something to do with clogged cats? Or is that a poor guess?

We checked boost with my friend today and it acts weird - car wants 2.4, boost is much lower, then it goes up to 2.3 when it is 2.3 expected by car, keeps it and then looses a lot and goes down to like 2.0

I no longer have that kick in the @ss that used to be there at around 3750-4000 rpms - it is more smooth and linear now.

Have you pressure tested yet as that sounds like a boost leak?

Will try to do so asap.

Was just reading some older posts and started to think if N75 can cause some of this - I have already changed both DVs and MAF so that's the last thing to check I guess?

Yeah,when we changed my maff we did the n75 at the same time just in case,there not expensive so got to be worth a try