RE: Rolling Dyno Question

[Malcolm White <M.White@sni.co.uk>]

>> Remember that these don't have to be fully equipped dynos ... all
they need
>> to do is allow all 4 wheels to turn and apply a load.  I doubt that
they
>> would have the output power measurement goodies ... since that is
probably
>> what you were looking for, the answer is likely to still be no ...

>The main problem in steady-stating is getting enough air past the
>vehicle - especially the intercooler.  We have a couple of AWD rolling
>roads around here, but they're no good for turbos.  You have to dump
>a couple of hundred kilowatts of heat to air _and_ get good flow over
>the intercooler.

There are probably at least half a dozen 4wd rolling road dynos in the
UK. Geoff at AmD uses a powerful fan system with multiple convoluted
rubber tubes (10" diameter or so) than can be taped to the IC air inlet
providing forced air where it is needed (this does work as the IC air
output temperature was constantly monitored by thermister during the
mapping and the bonnet was left open (with no glowing turbo/manifold)).
His system also provides power and torque graphs (as did the other 4wd
dyno I've used in the past).

I was in Swindon yesterday so popped into Dialynx (nice that it was a
social visit for a change!). They had 4 Sport conversions there
including Aelred's red one. Their new Sport racer has been painted in
the same silver as my S4 and boy does it look nice. It has an enormous
front intercooler (rad in back), water injection and K27 hybrid turbo,
over 400bhp and 485 lb/ft torque. When (or if) I ever sell my S4 Avant I
know where its engine and peripherals will be going! :-)

Malcolm.