RE: Rolling road day deemed success

[vixpy1]

MJK 24 said:

Bit bizarre some of these performance machines are way wide of the mark. My 20 year old Scirocco was tested last year. 125k miles, no mechanical mods, 20 years old. Should be 112bhp. Put out 115bhp. Tester said K&N aif filter element, Bosch Super 4 plugs and Optimax were worth 1bhp each to make up the extra 3. For what some of these cars cost, I'd be mighty pissed off it they were more than 10-12bhp down.

Vag cars have always been good.

I've had 16 valve mk2 golfs with over 200k on the clock put out what they had when they left the factory 15 years ago

[MJK 24]

vixpy1 said:

MJK 24 said: Bit bizarre some of these performance machines are way wide of the mark. My 20 year old Scirocco was tested last year. 125k miles, no mechanical mods, 20 years old. Should be 112bhp. Put out 115bhp. Tester said K&N aif filter element, Bosch Super 4 plugs and Optimax were worth 1bhp each to make up the extra 3. For what some of these cars cost, I'd be mighty pissed off it they were more than 10-12bhp down. Vag cars have always been good. I've had 16 valve mk2 golfs with over 200k on the clock put out what they had when they left the factory 15 years ago

Lol good old Germans. Do exactly what they say on the tin

[snuffy]

neal_mcdonnell said:

I think the figures at MK were pretty accurate. My wheel bhp was 311, and they put the engine bhp at 384. That's a 19% loss which isn't unreasonable for a heavy transaxle and 285 section rears. Plus the ambient temperature was 19'C so nothing there.

Ah, you see, we are all using different fiddle factors. Mine came out at 360 at the wheels, with a 15% lose gives 423. If I apply a 19% loss, I get 445 at the flywheel.

[vixpy1]

snuffy said:

neal_mcdonnell said: I think the figures at MK were pretty accurate. My wheel bhp was 311, and they put the engine bhp at 384. That's a 19% loss which isn't unreasonable for a heavy transaxle and 285 section rears. Plus the ambient temperature was 19'C so nothing there. Ah, you see, we are all using different fiddle factors. Mine came out at 360 at the wheels, with a 15% lose gives 423. If I apply a 19% loss, I get 445 at the flywheel.

Was it american type big roller dyno?

Would explain the high wheel fig and low loss.

[richardmancunian]

Both Snuffys and Neals Esprits did VMAX.

I may be wrong but top speed is all about bhp and aerodynamics.

Both cars had virtuallt the same aerodynamics (bar a spoiler on Snuffys) and Neals car I thinks is decatted and did about the same speed (+ or - a few mph) as Snuffys.

Therefore I suspect Snuffys rolling road bhp of 423 vs Neals sub 400 is inaccurate.

I would put them bioth at 390 ish.

[joe_icecool]

r988 said:

I see the Porker was dead on

Very unusual for a porker not to make at least the quoted figures, if one doesn't there is normally something wrong with the car.

Joe

[vixpy1]

joe_icecool said:

r988 said: I see the Porker was dead on Very unusual for a porker not to make at least the quoted figures, if one doesn't there is normally something wrong with the car. Joe