got an idea for a re-worked intake system

[MacDaddy]

I was just wondering if you guys think there would be any issues doing this to a otherwise stock S4 as far as check engine codes are concerned

the idea is to get a 3-1 FMIC, re-locate the MAF to the single charge pipe coming off the new intercooler and mount a BOV in front of the MAF (or possibly two DV's after the MAF) and then put two air cleaners in the stock SMIC locations to give you a true cold air intake.

my idea is basically to reduce the distance the air has to travel to the turbo and the temperature of the air by the time it reaches the turbo to reduce heat-soak and turbo lag and ultimately maximize performance.

any thoughts?

[Das General]

....put the crack pipe down.

the maf has to go before the turbo. placing the maf of the intercooler would be post turbo.

[MacDaddy]

....put the crack pipe down.

the maf has to go before the turbo. placing the maf of the intercooler would be post turbo.

The maf only measures air that actually enters the engine (as does any MAF sensor) as long as you don't change that (which my idea does not) there is no issue with the maf sensor being located after the turbo.

the kinds of issues i am talking about are things like the maf temp sensor and the IAT sensor having the exact same reading or some kind of issue with the maf being under more vacuum under WOT than it is in the stock system.

[HighDesertAudi]

Research blow-by MAF setups

[sean1.8t]

True^

or "blow through MAF"

The maf only measures air that actually enters the engine (as does any MAF sensor) as long as you don't change that (which my idea does not) there is no issue with the maf sensor being located after the turbo.

very false.

[GURUMAN]

Pretty popular mod in the dsm world, but they take a GM Maf wtithc was built for that. They use a Maff translator to alter the signal.

[MacDaddy]

false how? what is the maf sensor doing then? saving kids in africa?

[MacDaddy]

Pretty popular mod in the dsm world, but they take a GM Maf wtithc was built for that. They use a Maff translator to alter the signal.

has it ever been done on an audi?

[GURUMAN]

has it ever been done on an audi?

Never seen it yet

[JDM EJ1 95]

a lot of nissan guys swap to a blow through as well.

i assume it wouldnt be that hard with a standalone.

[sCeRaXn]

false how? what is the maf sensor doing then? saving kids in africa?

LOL! Look at it this way. The maf on our car is setup to meter air before it is compressed. Putting it after the turbo would make it see compressed air, so you would need software changes(and most likely a different maf sensor/housing) to compensate. As others have said, its a pretty popular mod on other cars but ive never seen it done on an s4. If you have a decent knowledge with electronics and the ability to change the maf signal at the ecu, as well as ALOT of time on your hands then i say try it out. Just dont keep high hopes for figuring it out lol

[JMTx86]

It could be done, rescale the maf anyone?

[Das General]

The question is why..

The path from turbo to intercooler to throttle body is not very far. It isn't as if there is an abundance of lag. I just don't see the extra labor and work involved, just for shorter distance.

[JMTx86]

The question is why..

The path from turbo to intercooler to throttle body is not very far. It isn't as if there is an abundance of lag. I just don't see the extra labor and work involved, just for shorter distance.

If you reduce piping on the intake side you can get the turbos to spool faster?

[MiniRS4]

....put the crack pipe down.

the maf has to go before the turbo. placing the maf of the intercooler would be post turbo.

/\/\ BIG 2nd!!!

stick w SMIC, FMIC 2-2 / 2-1, or dual FMIC.

3-1?!?!??!?! bhuahahahhaahha. i love this place!

[sean1.8t]

false how? what is the maf sensor doing then? saving kids in africa?

your sensor(THE ONE ACTUALLY IN YOUR CAR) is far too fragile to withstand higher temps in the first place.

also, you will be changing the amount of air the maf is designed to see. compresed air vs non compresed air. DUH!

IF you can swap in a blow through maf sensor to yours and get the ecu to 1)recognize it. and 2) read it at a rescaled rate, THEN it will work.

but it's going to take a whole lot of time/research.

and for what?

so you can runzz a sweet BOV? go PSSSH pSSSSH!!?

If you reduce piping on the intake side you can get the turbos to spool faster?

BARELY. if that. if you had a 10' intake tract before the turbo, and reduced it to 1", you might gain 50rpms of spool time.

but this is the dumbest reason yet. as the S4 doesn't even have lag in the first place. and if you were to put turbo's on the 2.7t where lag was present, you would be running SEM, which would do without the MAF anyways.

there, i proved you guys all wrong. i didn't want to. but you guys just wouldn't listen to, "no", "it wont work", "there's no point" as other's have stated also.

have a nice day

[JMTx86]

*edit* NVM

[MacDaddy]

well, it kinda got angry, but oh well, at least i got the input i was looking for eventually.

Looks like if i can compensate for a denser amount of air passing through the maf it would work fine (maf sensors may have a shorter lifespan)

all it really was is an idea I wanted to throw out there out of curiosity, i actually have no plans to modify my S4 unless its something i can do for free (porting the turbos, piggie pipes, etc)

[revhards4]

The best thing to do is throw the MAF in the garbage and figure out a way to change the programming for a 3 bar GM MAP and call it a day