another can of worms?

[rAudiguy]

Only real thing I can see wrong is it should be shoot mode 44 and not 8 but that won't make a huge difference.

[ArthurPE]

the ramp rate looks too high
it can be set in 2 units, km/hr/sec or rpm/sec
km range ~60 to 200 km/hr
rpm range 2000 to 8000 ~6000

the time used should be equivelent to the equivelent road time to do the same:
in 4th gear 60 to 200 km/hr should take 20 sec or so using sportauto numbers for in gear accel

it should be 140/20 = 7 or 6000/20 = 300, I must assume they used the km/hr/sec setting...
it's too high, what this does is sets the load too low and therefore the power the engine delivers...
I'ld like to see a run with a rr = 7

the lower the rr (the faster the car) the more power it produces...if the load is set low, the delivered power will be too...
the other runs were at 10 in 3rd gear (which is faster thru the rpm or speed range) it should have been closer to 5...

[_RS_]

Does the car "feel" like that torque curve? If it feels like it pulls hard to the red-line then I call BS on the whole dyno thing. It looks like someone else has said, it runs out of air. Without the front intake getting force fed I can see it not working out. On the road you're going over 100mph for the higher part of that run. Sitting in a workshop doesn't do it.

[DavidRoss]

Does the car "feel" like that torque curve? If it feels like it pulls hard to the red-line then I call BS on the whole dyno thing. It looks like someone else has said, it runs out of air. Without the front intake getting force fed I can see it not working out. On the road you're going over 100mph for the higher part of that run. Sitting in a workshop doesn't do it.

I agree, but what i dont get is if other cars (different manufacturers/models) do produce quoted power figures under dyno conditions then what is different about the RS4?

[lengster1]

Mine didnt always kick @5k it now has a brand new intake manifold and airbox flap assembly,could be worth a shout at the dealer as the power is dropping off too early on your graph.Just my 2p

[spikeyoldbiker]

Mine didnt always kick @5k it now has a brand new intake manifold and airbox flap assembly,could be worth a shout at the dealer as the power is dropping off too early on your graph.Just my 2p

i will give it go ..they have looked after me up till now so its worth a try

ive spoke to Doug at MRC , the graph is hard for him to compare against others as it was run in shoot 8 not shoot 44 , my inexperience with r/r setups there that was one thing i didnt specify to the tech at Weston but looks like many others he has seen

i think i need to get hold of vag-com so i can run the power / manifold flap test,it would also be interesting to see what the 0-60 0-100 times come back as ,my car doesnt feel slow on the road and doesnt feel like that torque curve at all


the point of the exercise was to lay down a benchmark before i fitted a miltek and ff cats but i didnt expect that low a figure

[P_G]

Only real thing I can see wrong is it should be shoot mode 44 and not 8 but that won't make a huge difference.

There is a difference in program tolerances between Shoot 8 and 44, 44 is normally used is it can record power increases normally associated with turbo spooling in 4 pot 4WD cars (hence 44) which is why it is handy for the RS4 as it can accurately record the power surge on our cars at 5500rpm. Shoot 8 runs a program that records consistent power increase normally seen with a n/a V8 such as the GM LS series engines. I wuld guess that is why Spikey's curve is faltter and more consistent, the program amy put don the incerase as an anonomaly / tyre slip.

So anyone using a rolling road should ask the operator if they haven't dyno'ed an RS4 before to put it on the same program as they do Scooby's and Evo's.

[_RS_]

Does the car "feel" like that torque curve? If it feels like it pulls hard to the red-line then I call BS on the whole dyno thing. It looks like someone else has said, it runs out of air. Without the front intake getting force fed I can see it not working out. On the road you're going over 100mph for the higher part of that run. Sitting in a workshop doesn't do it.

I agree, but what i dont get is if other cars (different manufacturers/models) do produce quoted power figures under dyno conditions then what is different about the RS4?

How many 4WD with Torsen diff though. Although I have no idea how that plays into it.
This seems to be a UK/Euro thing though. In the US I got 330whp @7300 (running out of puff too with only fans blowing at the radiators, on 91 octane). Wheel torque was 281ftlbs. We never get to see the wheel hp/torque from UK dynos, why the correction needs adding I don't know, it just adds more confusion. It didn't used to be like that for sure.
Forums in the US will also bash any little kink in the car and this just hasn't come up.