How far can the RS4's stock motor be pushed?

[sar]

Well, I can report in:

The RS4 motor I am pushing has given me its’ limit. I gave the engine a “little extra” boost with the Rotrex blower and “BAM” ! The EPC function kicked right in to protect the engine. I was at 7,100rpm and the engine pulled the shute. At first, I thought I had blown the engine. Instead, the engine made a massive cut off and the car limped in to “tree hugging” mode. Drove back home w/o pushing it, and eventually it semi-recovered, and it ran like N/A stock. I guess I pushed it a little too far? My brakes are pretty messed up and I can honestly say the engine did a better job than my rotors LOL. Tuning this thing is a PITA…

was there any eml or epc lights on before the engine pulled the chute?, just cause it sounds like you hit the hard limiter at 7000rpm you get when the epc light is on.
a few of us in the uk have had the sticky manifold flaps problem, the tumble flaps sensors would record the flaps being in the wrong position and throw the eml light, after a while and more wrong positions being recorded by the sensors it would throw the epc light and impose the 7000rpm hard limiter(sounds crazy when you hit it especially with the non res milltek i had on at the time, i can see why you thought you had blown your engine).
obviously these sensors are now redundant on the tts manifold, are you sure these have been coded out correctly in the mapping?.
im no expert and probs way off but i just thought id mention it.
can doug not shead any light on it?, im sure he must have pushed dannys old car quite far(he had permission to blow it lol) before they settled on the 620ps figure.

p.s first post! ;D

[sakimano]

Welcome sar, good input. For those who don’t know sar has an amazing RS4 (Avant?) in the UK with full JHM exhaust. Sat bit sure you noticed, but the guy who sold you the exhaust has already ditched the I’ve gee replaced it with. Guess the comments that he was being hasty were bang on. His loss, your gain!

There are indeed a bunch of things that could have caused what sobers4 described, and your post is a great example.

Sobers4…you mentioned a little more boost…how is that? Different pulley?

What octane were you tuned for and what was in the tank? I think you are in Florida right? So altitude is not a concern. Octane on fuel in the UK vs here is obviously not the same. Ron and Mon numbers can be disparate, even from the same company.

[SoBeRS4]

Sar:
Good to have you here! I appreciate your valuable input and I will report back when I get a chance to plug the car back in again. Currently I can only speculate what is going on and I do not want to ruffle anybody’s feathers until I get the facts. The EPC light now illuminates as soon as I push the engine and turns off shortly thereafter. I will certainly send Doug the codes for his input as well. We’ll have her fixed up in a couple of days.
Sakimano: There are a few gas stations down here in S FL with 110 octane and I just couldn’t resist. ;D. Normally I run 93. BTW Sakimano, you are up in Canada right? Send down a coldfront please, we need some cold dense air down here.

It wasn’t raining and no car wash.

[bigserve134]

Have you looked into the codes for yourself?

http://www.obd-codes.com/trouble_codes/audi/

I know I had my light come on and after I vag-com’d it, revealed some random periodic misfires.