Rolling Road after Homefry

[sjw185]

My mate was at a subaru rolling road day yesterday and gave me a call, so i went along and they were good enough to let me get the s2 on for a run.

Flywheel 276.9hp
Wheels 209.8hp

[Jamo]

Nice results, interesting to note their correction figure is 32 % for 276.8 bhp

whilst assuming traditional 25% transmission loss at 209.8 I get 262.25 bhp

[sjw185]

Nice results, interesting to note their correction figure is 32 % for 276.8 bhp

whilst assuming traditional 25% transmission loss at 209.8 I get 262.25 bhp

Cheers Jamo

Im stll happy looking at 262 with stock hoses need to get the Mark H mod on and fit my rs2 air box next:cool

[Rusty]

Miner was 240 ATW and 296 ATF so 60bhp losses.

209 ATW indicates a boost leak or plugs to me. What were the AFRs like?

[sjw185]

Miner was 240 ATW and 296 ATF so 60bhp losses.

209 ATW indicates a boost leak or plugs to me. What were the AFRs like?

Been away a week Here is the fueling/boost plot Andy

[EspenW]

They calculate with a drivetrain loss of 24.2% at peak power, which is not unheard of.
The Dyno Dynamics dyno is known as the heartbreaker, infamous for giving the lowest numbers in the dyno biz.

[Rusty]

Fuelling is spot on. Give yourself a pat on the back

[sjw185]

"Dyno is known as the heartbreaker,"

Fuelling is spot on. Give yourself a pat on the back

Gotta get those calipers on pronto

cheers

[EspenW]

"Dyno is known as the heartbreaker,"

Yup, B7 RS4's have laid down 280hp to the wheels on the Dyno Dynamics dyno.

[Animal Mother]

Been away a week Here is the fueling/boost plot Andy

How do they measure boost pressure?

[Rusty]

Usually they coinnect a line to teh front of the IM where the DV feed comes off, that then goes to a sensor in the dyno. They're calibrated so supposed to be more accurate than your in-dash gauge. Not sure what sort of pressure drop you get along the manifold though...

[Animal Mother]

Usually they coinnect a line to teh front of the IM where the DV feed comes off, that then goes to a sensor in the dyno. They're calibrated so supposed to be more accurate than your in-dash gauge. Not sure what sort of pressure drop you get along the manifold though...

Ah, ok, I wondered what they were fiddling with under the bonnet.

[Rusty]

The problem is that they rely on the well used tube to seal and it doesn't. I had a boost leak on a RR session (and lots of cars were inexplicably running rich) and I think it was down to a leaking hose on teh machine. I had used a fuel pipe clip to hold the pipe in and it hadn't been replaced. Car ran poorly for the first time in ages and some investigation indicated that this was the problem. From then onwards I make the RR operator put a cable tie on their pipe, I'm damed if I'm having £50+ of RR time ruined by someone elses' kit. The other thing I've done is told them to use the gauge as I know what figures I'm expecting and can do a boost leak test beforehand.

[sjw185]

Yea they connected the boost pipe to the front of the inlet mani with a tee piece thing blew off on first run too much boost