I think the RS4s limits minus 50 whp will be the level. I also think they will find that limit. If i were guessing id say itll threaten 10s and will trap high 120s...(dont know about a dyno…probably 550 whp 400 wtq type numbers)
Based on what we now know (that the 2.7t needs to be built as it approached 500 whp, while the RS4 is comfortable being pushed well past that)…is it fair to say that the RS4 4.2 its the best stock motor for handling power out of all the B5/6/7 options?
The B5 guys must be ready to vomit reading this 
^^True. But, to be fair the 2.7 is a much smaller engine.
that matters how? I don’t usually get a handicap at the dragstrip or when lining up against a friend based on displacement .
“Sir…you in the 4.2 RS4…please move forward 6 car lengths on this pass as the car in the right lane has a 6.2 litre V8. Thank you.”
or
“Hey wait…we’ll go on three honks, but you start up by that lightpost because I noticed you have a 3.0T B8 S4, and I have a 4.2”
The specific output argument really only matters back at the factory when patting engineers on the back for achieving something interesting. Once the car is in our hands, it’s irrelevant.
I have to agree with Saki’s post. When it comes down to it the 4.2 doesn’t have the limitations the 2.7T does on stock internals. Simply put, where the 2.7 falls off the 4.2 keeps going.
As far as the comparison of stock block capabilities the 2.7 is doing quite well. I don’t think the 4.2 limits are known yet, but let’s say the 2.7 is nearing its max @ 600 chp. That’s approx. 222 hp/liter. For the 4.2 to put that ratio on the stock motor it would have to pump out 933 hp.
^^ D lo thats exactly what I was referring to. Hp/liter on paper comparison. Obviously that means nothing in the real world though. Especially since they weigh close to the same amount.
When the hot weather returns , I will be assembling a single turbo on my RS . Hoping to have 500 to 550 hp to the wheels. So I’ll let you know if it stays together.
lolwut?
Pretty big job. Can’t wait to see who tunes it!
Where are you thinking of locating the turbo? If you don’t want to share, that’s entirely understandable.
Battle of the boosted V8 FSI… J-spec turbo vs JHM supercharged vs APR supercharged vs TTS
in for info
…for you Saki
Don’t tease us Jnaut, you can’t bring these kinds of things up an then disappear like a fart in the wind. Good luck though, looking forward to your setup and placement.
LMAO!
I will get Into details later, but all parts have been purchased and preliminary layout is handled. As for tuning I will be leaning on Jhm/ Kurt hopefully.
I went to +150 hp with nitrous . Engine ran great.
Stock rods and pistons can get you to 650 hp engine hp .
Dynamic compression ratio of the rs4 can be modified with help of variable intake and exhaust valve timing.
TTS is winning at the moment, but we’ll see what the future holds ;D
LOL
Well will have wait and see!
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…
I concur. Me too! Im looking at some big brembos for my next mod
How much HP is on the MRC tune? 600? 625? My brakes are completely inadequate…cant imagine how much worse it would be with your power!
[quote]How much HP is on the MRC tune? 600? 625? My brakes are completely inadequate…cant imagine how much worse it would be with your power!
[/quote]
I am not comfortable with the data we are getting from the engine, too early to give accurate/consistent readings. Right now the engine has tourette’s syndrome and I am not going to give out B/S figures.The engine is all over the place. With this said, MRC has posted very conservative numbers in our opinion, perhpas the British Isles has worse weather than our Florida humidity??
I don’t get it…epc light? What bashes you think that was a safe guard by the motor because it was being pushed to its limit?
Could be a bunch if things. Moisture in the ecu even. Was it raining? Had you been to a car wash?