Surrey Rolling Road Day - Saturday 17th January 2015

[bazza138]

that's a good handing car that is !!!

Gutted couldn't make it

What happened to you?

Working found out I was on call last week ! Chiswick , then Victoria

[RIV]

[

Working found out I was on call last week ! Chiswick , then Victoria

Gutted!!

[esp_mm-270]

you need the gearbox hot - I bet the more runs you do the power comes up - but then you have to be careful you don't heatsoak the engine and it makes less (proper pita for the turbo cars stopping heatsoak with multiple runs) the b8s usually do 420-440ps on our dyno

May well be but the other b8 did over 420 with winter tyres on (more drag it's said). The other thing, his dyno don't do wind down so are these figures whp? Still Doug, mine left you with 430 bhp and 330 lb/ft and after at least 17k miles since last carbon clean it's looking ok and all dyno's read slightly different of course

[RIV]

May well be but the other b8 did over 420 with winter tyres

I thought it was less 413?

[Doug_S2]

May well be but the other b8 did over 420 with winter tyres on (more drag it's said). The other thing, his dyno don't do wind down so are these figures whp? Still Doug, mine left you with 430 bhp and 330 lb/ft and after at least 17k miles since last carbon clean it's looking ok and all dyno's read slightly different of course

measuring rundown is just one more step to remove something that changes - the drivetrain losses with temps etc. someone should have logged every car and then you can justify the power and torque numbers each car does on the dyno.

[esp_mm-270]

Doug, graphs below. It's only done 250 miles since you tweaked it and it's still the same brute, just having to adjust driving style to this weather as it struggles to lay it down.

Just looking at ur figures and it's close to 5% different. Conditions? Dyno differences? Any who, add 5% to my result and I'm back to 430

[Doug_S2]

winter tyres in my experience mean as much as 20ps less at the wheels.

[esp_mm-270]

May well be but the other b8 did over 420 with winter tyres on (more drag it's said). The other thing, his dyno don't do wind down so are these figures whp? Still Doug, mine left you with 430 bhp and 330 lb/ft and after at least 17k miles since last carbon clean it's looking ok and all dyno's read slightly different of course

measuring rundown is just one more step to remove something that changes - the drivetrain losses with temps etc. someone should have logged every car and then you can justify the power and torque numbers each car does on the dyno.

Makes sense, ty

[TechNick]

Love the picture!

This one may be better


...is it just my dodgy camera work, or is the plate slightly wonky?

[RIV]

is it just my dodgy camera work, or is the plate slightly wonky

Plate straight, camera angel?

[GrahamS4]

Car was just ticking over for 5 mins before run

Roughly how long since it was driven before that?

[RIV]

RIV wrote:
Car was just ticking over for 5 mins before run


Roughly how long since it was driven before that?

Around 1 hour

[TechNick]

is it just my dodgy camera work, or is the plate slightly wonky

Plate straight, camera angel?

Posted the wrong pic for a few seconds, then corrected it!

[RIV]

Posted the wrong pic for a few seconds, then corrected it!

Few!! Thought I had lost the plot

[TechNick]

Dyno comparison wise i was 2% down compared to my Mrc run just before Xmas.

445HP vs. 490PS for me, but clearly not running at its best, judging by the air coming out of the back during the run.

charge coolers need to be super cool to start with or big power differences - still on same fuel? Charlie gets similar numbers to our on the b8s so something not right - and you didn't rev to 7200 limiter.

Yeah, still on fresh Momentum99, although had some VPower through the system previously (should have been long gone by the run, though, as emptied the tank right down then filled it with momentum and drove it for 150-odd miles a couple days prior to the run).
Yeah, something not quite right - I'll need to get it in to you for a health-check.