Post your dyno results here!

[Bobby Dazzler]

GrahamC230K - 1999 C230K - Manual - Standard - Graph scanned - 166.8 BHP on a dynodynamics
GrahamC230K - 1999 C230K - Manual - Modified (not very sucessfully) - Graph scanned -168.4 BHP on a dynodynamics
andy cyp - '?? C32 - Auto - Modified - Graph scanned - 288BHP on a dynodynamics
vixpy1 - '?? E300TD - Auto - Standard -135 BHP on a dynodynamics
vixpy1 - '?? E300TD - Auto - Standard - 154 BHP on a dynodynamics
Bobby Dazzler - 2003 C32 AMG - Auto - Standard - 296bhp & 297ft-lbs (Dynojet at-the-wheel)

 

[GrahamC230K]

296 BHP at the wheels -wow! Sounds feasable given the stock engine figure.

That really is very impressive.

 

[Bobby Dazzler]

Thanks Graham. It was a touch better than I was expecting, so I'm chuffed.

Before the run I was expecting 279-286 rwhp based upon 18-20% transmission losses.

But it's such a wooly science I'm not really interested calculating back to the flywheel from rwhp.

 

[andy_cyp]

GrahamC230K - 1999 C230K - Manual - Standard - Graph scanned - 166.8 BHP on a dynodynamics
GrahamC230K - 1999 C230K - Manual - Modified (not very sucessfully) - Graph scanned -168.4 BHP on a dynodynamics
andy cyp - '?? C32 - Auto - Modified - Graph scanned - 288BHP on a dynodynamics
vixpy1 - '?? E300TD - Auto - Standard -135 BHP on a dynodynamics
vixpy1 - '?? E300TD - Auto - Standard - 154 BHP on a dynodynamics
Bobby Dazzler - 2003 C32 AMG - Auto - Standard - 296bhp & 297ft-lbs (Dynojet at-the-wheel)

Im quite puzzled here bobby................................

Ive re-mapped,changed the whole intake to the larger 55's and vixpy dynoed me at 288 rwhp then calculated that at approx 384 bhp, if your cars got standard 296rwhp then that would obviously approx to over 400bhp at the crank and all on a stock engine ???

Either the 2 dynoes we both used have a considerable difference in measuring the power or your car is no way standard, maybe i need to dyno mine were you got yours done to compare figures,,, who done yours Rob ??

 

[GrahamC230K]

Just variation in dynos I expect. Vixpy's is a dyno dynmaics I think. Suspect you will get a higher reading on the dyno jet Bobby D used.

 

[stats007]

Andy I think your (or vixpy's) calculations are a bit wonky - assuming 20% transmission losses - 300 RWHP is only 360BHP at the crank. the figure you have assumes 33% losses which is ridiculous.

 

[Bobby Dazzler]

It was at Awesome GTi in Irlam (Manchester). Excellent setup and service by the way - very impressed.

The organiser of the event (not Awesome GTi themselves) uses the following to approximate flywheel power for RWD cars - add 10 bhp to the wheel figure and divide the result by 0.88 - which at 296 rwhp works out at 348 bhp at the crank. Pretty close to the published figure of 349 bhp.

In the past I have used 18% transmission loss as a rule of thumb for manuals, and I would expect a little more on an auto, maybe 20% - this works out between 361 and 370 bhp at the crank.

Taking this range of estimated crank figures into account I think 296 rwhp is probably about right.

I did take a look at mbworld tonight to see if I could find any scanned graphs to compare to mine to see if the shape of the curve is similar, and I found a post that suggested a Dynojet will read about 15% higher than a Mustang dyno. Not sure how that compares to the Dyno Dynamics dyno which Surrey Rolling Road use.

It's the first time I've had it on the rollers, so got nothing else to compare it to.

 

[Bobby Dazzler]

We did say we'd get together with Pete and the other 32s at some point - and anyone else that might want to come along - we could perhaps do a chassis dyno session?

Awesome would be a good venue, as would Surrey Rolling Road. The other place that springs to mind - Powerstation in Cheltenham - said they wouldn't do an auto when I asked last year.

 

[andy_cyp]

Im up for it Rob, just let me know if and when it does happen.

Im sure vixpy told me he accounted for a 25% transmission loss, god knows.

 

[Bobby Dazzler]

I've had a brainwave. Thorney Motorsport in Milton Keynes have a fantastic setup - a Dyno Dynamics dyno in a sealed cell with four huuuge fans and directional ducting.

Seems like it might be well placed to get a few members along, as it's fairly central. Cost is £45 per car, and up to 25 cars in a day.

Let me make a few enquiries.

 

[andy_cyp]

I've had a brainwave. Thorney Motorsport in Milton Keynes have a fantastic setup - a Dyno Dynamics dyno in a sealed cell with four huuuge fans and directional ducting.

Seems like it might be well placed to get a few members along, as it's fairly central. Cost is £45 per car, and up to 25 cars in a day.

Let me make a few enquiries.

Andy_cyp------deffinate

 

[LeighW]

At the risk of appearing thick, how do you get it to hold the gear (say 3rd) at low revs and prevent it kicking down to a lower gear when running an auto on a rolling road?

 

[Bobby Dazzler]

At the risk of appearing thick, how do you get it to hold the gear (say 3rd) at low revs and prevent it kicking down to a lower gear when running an auto on a rolling road?

Some dyno operators won't do autos as it's a bit of a pain to do - apparently it's difficlt to prevent it kicking down. To be honest I don't know how the operator did it, although it did take several attempts.

 

[Bobby Dazzler]

Andy_cyp------deffinate

Andy - I've dropped them an email to see what's what. Will be in touch when I hear back.

 

[Doodle]

Would be interested in this, provided nobody minds me turning up in the blue banshee. It's had a few mods lately, and I want to see if there's any improvement over November's stock run of 182 @ wheels.

 

[Bobby Dazzler]

When I sent the email I said we'd have autos & manuals, RWD and maybe a couple of Quattros (thinking of you and Graham - our Audi contingent).

Oh hang on - "blue banshee" - is that the Integra?

 

[Doodle]

It is indeed...ear defenders on standby for the sound of 9000rpm through an HKS exhaust

Wouldn't bother with the S6, it's probably too large to fit in the dyno room

 

[GrahamC230K]

It is indeed...ear defenders on standby for the sound of 9000rpm through an HKS exhaust

Wouldn't bother with the S6, it's probably too large to fit in the dyno room

Nah, we know it's beacuse you know it has more whp than the Honda

 

[Doodle]

Indeed it does (although with a 4wd system and autobox, probably not that much more) However, with twice the cylinders and twice the capacity, it bloody well should do!

 

[Bobby Dazzler]

Bobby Dazzler - 2003 C32 AMG - Auto - Standard - 296bhp & 297ft-lbs (Dynojet at-the-wheel)

Had a thought, the aircon and headlamps were on when it was dyno'd - not sure how much power they'd soak up though - not too worried TBH.

Here's the graph:

And here's the car: