AAN into Ur quattro, 400-450 Bhp Target

[URquattroGus]

Here are the current intercoolers;


Drivers side (end tanks at right angles, but in different directions)


and Passenger side



Air filter: (inc 180 turbo to maf hose and then another 180 to air filter hose)

[Billman]

all of your IC have 90 degrees inlets/outlet?

[Jamo]

Is that a ASH filter?? they rate them only to 200 bhp

[DJones]

all of your IC have 90 degrees inlets/outlet?

Angus,

May be that's the difference this is what mine are like, the only tight one is to the right of the right inter-cooler, (left in the picture) but it sweeps as much as i could get it to.

[URquattroGus]

Yes all 90 dgeree inlets and outlets and yes an ASH filter. I didnt fit the ASH filter (or coolers), but in fairness it looks like the only thing that will fit, and there is no "horsepower rating" in the catalogue. On their ebay site it now says 200bhp.

Not sure what other air filters would fit, I might try a genuine HKS one but I think these are nearly twice as wide.

The intercooler setup I have been wondering about for a while... Neat but certainly more sharp bends than ideal, yes?

[prj]

Just measure pressure drops, before taking any drastic measures.
Swapping various bits and guessing is pretty much wasted time/money, when you can approach the problem quite easily scientifically.

[Billman]

you can try out just a "metallic frame" to see if the filter element is the restriction but not on the turbo as here. On the position where your filter is before MAF.



Prj is right about the scientific approach but the filter is easy to check.

[Billman]

anything new?

[blackS2]

You can measure intake pressure drop by connecting the boost gauge to the intake though and seeing how much vacuum there is on boost.

http://www.knfilters.com/filterminder.htm

[Bram]

http://www.knfilters.com/filterminder.htm

excellent piece of kit. I also used it to measure air filter restrictiveness before the turbo.

[blackS2]

excellent piece of kit. I also used it to measure air filter restrictiveness before the turbo.

I don't need

[Thuppu]

It would be interesting to see results of the pressure drop, if there is any, with the dual IC's. Somehow I doupt it causes any notable restrinction at this power level..? On the other hand, Angus should try to dyno the car without the air filter. If it's specsed for 200hp it seems like a potential restrictor. Somewhere I saw dyno results with and without filter, and there was quite a big difference in power output. Can't remember where I saw the coparision.

[diesel des]

Angus, there is definately something wacky going on there. You should have noticibly better spool than that. I can make 1.5 bar boost at 3k rpm with the 2871r. Have you a profile of rpm and boost. I would check for vacume at compressor inlet. Go out to the yard and borrow one of those pressure indicators shown a few pages back. Many gensets and tractors have them. Also measure delta p accross the intercoolers. Also check cam timing.

That new turbo should be at 2 bar boost before 3.5k rpm...

[prj]

N75 duty cycle map would be nice to see as well... probably won't happen though.

[URquattroGus]

Angus, there is definately something wacky going on there. You should have noticibly better spool than that. I can make 1.5 bar boost at 3k rpm with the 2871r. Have you a profile of rpm and boost. I would check for vacume at compressor inlet. Go out to the yard and borrow one of those pressure indicators shown a few pages back. Many gensets and tractors have them. Also measure delta p accross the intercoolers. Also check cam timing.

That new turbo should be at 2 bar boost before 3.5k rpm...

Yes, I'm a bit irked at the moment as to what the problem is. on the road it does feel like an improvement though.

Its MRC mapped, not sure what the chances of a boost profile map is...

What do you mean pressure indicators? Map sensors attached to a data logger??

and what do you mean by delta p? pressure drop or efficiency?

Whats the best way to check cam timing?



As for pressure drop;

I had two boost gauges rigged up at the weekend, but found them hard to watch. Boost guagge is mounted too low, you certainly neeed to look where you are going!!

There wasnt a big gap but I need to test for longer.

And then it snowed 6" so that put an end to that....

When I look at my setup the pipework between the two intercooolers could be maybe improved, but it looks better in other areas than a couple of other twin intercooler setups, with less bends in some places.

Another thing I'v done is order an Apexi air filter and various pipework to try and alternative air filter setup.

I really don't have much time outside work at the moment, I would almost happily pay someone to sort this out right now by testing things properly! Is there anyone that can do this for me?