RS246 Rolling Road Meet Sat 17th Nov Thorney Motorsport

[55JWB]

Was that figure Wheel HP or crank HP Jason ?

Crank

The two graphs I have are 261.7 hp I assume at wheels and 323.2 hp reclaculated to the flyweel

Jason

[VARSITY]

Jason,

I would suggest that you take Thorney up on their offer of having your car run again. I really don't believe that your car is that low. There would be NO reason why this is the case and it would be good to see the car run at a.n.other dyno but for piece of mind I would contact Thorney and arrange a retest. Especially as he had admitted it wasn't right in the first instance due to incorrect set-up.

[Ads4]

Excellent day out (albeit a very cold one!) and nice to put yet more faces to names (nice to finally meet you Clive!). Well done Dave for sorting out the day, I know how many headaches you went through sorting this one out.
Cheers to Doug and Mihnea for helping me get the figures...my Holy Grail has always been 450!!

452.8 @ the crank, 345.2 @ the wheels and holding 480 Ftlb torque for over 1k revs!

[MarkB]

The roolers were performing much better later on in the day. Take it back for a retest if you can...

[55JWB]

Will give them a call on Monday to see what they want to do....

[Ads4]

P.S. FATS 3.66 and many thanks to Harper D for his continuous VAG COM efforts

[S4TAN]

314hp@wheels, 406hp@crank and a whopping 510ft/lbs torque! Funny cos me and CliveH made nearly the same @wheels (Clive was 316@wheels and 425@crank but made less torque) - my power tailed off due to high IATs at the top end according to Mihnea. Clive is running the AWE i/c's and me the RS4 i/c's - just goes to show how much difference good intercoolers make!

The most graphic illustration of the day was the massive difference between SMICs and an FMIC - huge difference as was demonstrated by Adam as the FMIC is the only real difference between our cars set-up - the FMIC is definitely the thing to go for if you want the top-end power to stay consistent. I'm sorely tempted to get one (but am a bit put off by the chopping involved)!

Still - a great day out (but freezing f*cking cold - my back is seized up!) and I'm well pleased with my results so big thanks to DaveT and Thorney MS for organising it all - job well done chaps.

3.78 FATS (thanks for the logging Davey boy)

Good to put some faces to the forum names too.

[Jarv]

My results:

425 @ wheels
330.5 @ flywheel
542 FtLb's torque
3.46 FATS

I, of course, meant 330.5 @ wheels and 425 @ fly-wheel.

the correction temperature on the dyno is the air temperature - not the intake temperature.

I did a test with 2 similar tuned S4s - one with FMIC and one with stock s4 SMIC - running the same file - the differnece was 370bhp to 440bhp and intakes were 100+ deg c and 30 deg c (IIRC - there is a post on here) Side By side on teh road there was hardly anything - and intake temps on the car with stock ics wera round 50 deg c max)

Cheers Doug, very interesting. So by that rationale, the difference on the road between a car with SMIC's and an FMIC would be around 20, maybe 25 deg, which would make a difference, but not much. I still want one though, and I'm not affraid of chopping.

[S4TAN]

So by that rationale, the difference on the road between a car with SMIC's and an FMIC would be around 20, maybe 25 deg, which would make a difference, but not much.

This is what I understand too Mike - in real-world terms there probably wouldn't be that much difference between me and Adam - he'd have the edge but by a car length maybe. I suppose the FATS runs bear that out - 0.12 of a second difference is what, a car length at that speed???

[VARSITY]

That'd be right Julian, your full of TORQUE! or is that..........

[S4TAN]

That'd be right Julian, your full of TORQUE! or is that..........

Yep Dam - I got all those jokes hurled at me yesterday!

And I'm full of <beep> too ...

[s4woody]

your not alone on that 1..i parked ther and my car wouldnt open..i think there was strange goings on over that side of the car park..and im not on about shiney tit,s pressure testing either..

ChrisS2, H8CAK and my car all suffered from being unable to lock and unlock using the remote, it's working fine again now so very strange.

once i moved the car all was fine..

[DavidT]

Thanks for the comments, I'm glad everyone enjoyed it.

I felt sorry for Steve with the TT, I've been there. Let us know how you get on please mate.

The running order got screwed up because John Thorne could not get on the forum! I did not know until 10am that we were going off the list, nor that he wanted to run the different cars later. After a slow start they did very well with the B5's & worked hard. Fair play, thank you.

I thought the results were fairly consistent & I look forward to people posting their own so we can do a list (please don't post anyone elses results or details)

The idea of doing FATS is so we can compare RR and on-road figures to get the maximum value from the day.

Mine were 405.6 bhp & 460 ft/lbs. Very happy with that, based on how little boost I run - 1.4 bar falling to 1bar at 6500.

[Jarv]

So by that rationale, the difference on the road between a car with SMIC's and an FMIC would be around 20, maybe 25 deg, which would make a difference, but not much.

This is what I understand too Mike - in real-world terms there probably wouldn't be that much difference between me and Adam - he'd have the edge but by a car length maybe. I suppose the FATS runs bear that out - 0.12 of a second difference is what, a car length at that speed???

That's funny, I noticed Ad's FATS time too and compared it to mine. He's showing as 28 more brake but 60 FtLb's less torque, and that shows in a FATS time difference of 3.46 for me against 3.66 for Ad (I'm assuming that an S4 is also slightly less lardy than an RS4 as well).

I read something somewhere (bit vague, I know!), that an increase of 40 degrees on the intake temps can equate to around a 5-10% loss in power. So if, in the real world, a FMIC can lower the intake temps by 20 degrees, at 400 brake that's an increase of between 10 and 20 bhp.

So, two things, yes, a FMIC does work, but better on a RR, and torque is the new bhp!

Mike

[DavidT]

Mike, the gearbox is different on an RS4, you have a lower 3rd & 4th gear, so you can't compare FATS unfortunately. S4 should be a bit lighter too, as you say.