cams

[volcano rs]

My S4 is equipped with both NM (rare Audi 2.0 20V 80/90 engine) cams and the car performs great with the tubular mani and Gt3071R! I was really surprised comparing the car to K24 setup - nothing is lost really. Thought the NM cams are not as agressive as 7A cams and theoretically should stay between rs2 and 7A cams setups. You can get better info about all cams in the 20V_kruemmer Yahoo groups.

so what you're saying is to keep exhaust cam standard and reprofile the inlet so its less aggressive?

[Greg_S]

Certainly is mate, i'm only going from what other people have tried.

Well you have a fair bit on lately mate by the sounds of it. Are you going to be at the R/R meet Greg? If so could you bring the RS2 inlet cam so i can do some measurements.

Cheers,
Chris

yeah thats no problem, from what I heard recently though the rs2 intake cam is the same as the S2 cam except the cam pulley is different?

[Krists]

so what you're saying is to keep exhaust cam standard and reprofile the inlet so its less aggressive?

Actually I can't argue on this because I haven't driven 7Ax2 exuipped car. My friend just installed it on his S4 and the car idles horribly. I don't know whether it's cause of 7A cams, bad cam aligment (he has both of them made adjustable) or just a lack of untuned ECU (Megasquirt)

I think that You can put them on - drive the car - If You don't like it much - leave the 7A exhaust cam only + 3B/AAN/ABY inlet.

I had bad experience with advancing the NM cams with just pulling the cam pulley 1 tooth back. The car with rs2 setup had a terrible lag before 3500rpm, after that - fantastic journey through the rev range.
I placed them in original place and the lag in daily driving around the city with GT3071R can be comparable to K24 system.

[Audi_CQ]

I've used 7A x 2 on my 2.5 with no problem. Large turbo (T66 wit Q-trim) so not much boost until ~4K, but OK at low revs too. Had 170nm @wheels already at 17-1800 rpm Idle was like stock.

[zlobo]

i am usin both,, and my car gor mor ageessive on high rpm. befor i used rs2 exhaust an s2 in and and i got boos with 7A ~100rpm erlier cant say 100% for shure bause i used a stand allone ecu with the 7a.

[Azman]

I have both in mine as you know Volcano and since the exhaust has been done to 3" there is a noticable difference, pulls alot better lowerdown than before but still it is a high revving beastie and like to be above the 3500rpm mark (and I like to keep it there

[volcano rs]

i ask all this because when i have mine mapped i want to be sure i have the right cams to get the full potential from my set up.
i have 3 inch exhaust all the way and no idling or running problems at all .because i'm using this set up for the first time i want to get maximum power / torque out of it . i red lined it the other day and i had no rev limiter cut in at all .for standard ecu it seems to pull well .
and jamo that would be nice if i could just see how it behaves thanks

[Faheemo]

Ive got the 7a Exhaust cam and the ABY Inlet cam, power and boost shifts about 500 rpm higher with the 7a Exhaust on vs the stock ABY.
car pulls very good all the way to redline.

Jamo did you try the 7a exhaust on yours ?

[volcano rs]

anyone else using both cams ? and your opinion please

[zlobo]

i am curently thinking if i shuld look fot other cams on not for my new engine, but i dont know what to chose there is cat cams, shrick and some more brands. i thought about ~266 deg with ~10-11mm lift. but i dont know how much they will improve.

[volcano rs]

according to kruemmer files the inlet on 7a is different adu is different 3b and aan are the same .
exhaust on adu is different to 7a 3b aan which are the same .so its the inlet that should be changed not the exhaust which most people on here change .

[Jamo]

The ADU and 3B inlet is a different part number because the 3B has the dizzy gear at the end. The timing is suppose to be the same.

7A exhaust is not the same as the 3B, AAN and ABY! Its got higher lift for a start

All the specs for the cams are on this forum from Pisobiker who measured them.

[Urquattro20V]

The 7A cams debate will probably never die

My guess is as good as any, but i plan to use them both for a big turbo setup which will be somewhat laggy anyway. The more aggressive inlet cam should help in the upper end of the rev range. Smaller setups like K26/27 are probably better off with just the exhaust.

Custom cams would be even better of course.

[Jamo]

The cam usage is dependant on your turbo characteristics as well.

Some will suit the 7A inlet some won't it's a dark art of trial and error for your own motor.

I personally wouldn't have at considered using the 7A inlet after reading on here and seeing Doug_RS2 dyno's plot but it works a treat in my car.

[zlobo]

Javad uses 7a