icecarver
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| posted on 26/4/07 at 04:58 PM |
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transmission losses
Can anybody tell me how much power they lost
from flywheel to rear wheels.
Please no "expect 25% ish" but actually what
the manufacturer bhp rating against rolling road
at wheels figures achieved.
Also what diffs, reverse boxes, props ect
Cheers Martin
Yes I had a dissapointing dyno session yesterday
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zxrlocost
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| posted on 26/4/07 at 05:05 PM |
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ok so what did you get
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zxrlocost
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| posted on 26/4/07 at 05:16 PM |
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the current owner of my old car got a 161 bhp r1 carb engine and at the wheels was 129bhp from memory
thats with sierra running gear
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icecarver
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 posted on 26/4/07 at 05:43 PM |
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power
a poor 167 at wheels
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DIY Si
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| posted on 26/4/07 at 05:55 PM |
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Why is that poor? That sounds more than reasonable to me! You probably looking at 200 ish at the crank with that!
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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zxrlocost
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| posted on 26/4/07 at 08:16 PM |
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Martin I presume you have a gsxr1000 engine
now without knowing the mods
that car with 160+ bhp at the wheels should be absolutely ballistic quick
have you drove it yet?
I couldnt figure whether you had passed your sva?
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smart51
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| posted on 26/4/07 at 08:43 PM |
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I got 152 at the rear wheels with my 98 R1 and was made up with that, considering it had 148 at the flywheel when it was made.
They guy on the rolling road made a good point when I asked him about power at the wheels. He said that the losses in the prop, diff and wheel
bearings are not a fraction of the engine's power but are only dependant on revs. It it takes 10 BHP to turn them at a certain road speed then
it will take 10 BHP whether your engine makes 100 or 1000 at the flywheel.
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icecarver
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| posted on 30/4/07 at 03:50 PM |
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engine
Gsxr 1000 super charged / dry sumped
have only driven round our carpark 200yds
long cant find any grip as yet just lots of power slides.
Hope to SVA in the next 6/8 weeks depending
on work.
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Headrush
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| posted on 30/5/07 at 12:50 PM |
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R1 (2001 5JJ carbed) made 128BHP at the wheels, but its all bollox as the dynos vary so much. Take it to somewhere with a proper Dyno like a
DynoDynamics rolling road if you want a consistant reading or use a good hub mounted dyno.
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Headrush
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| posted on 30/5/07 at 12:55 PM |
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Oh yeah, as a general rule mid engine rear wheel drive is more efficient.
The old 0-60 estimation equation of:
weight (kg) / (BHP(crank) x 0.9 seems to apply reasonable well apart form MR layouts which seem to equate better to weight(kg) \ BHP(crank).
e.g. elise:
730 kg \ 118BHP = 6.2 seconds (about right)
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