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Author BHP calculation
Toby
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Registered: 29th Nov 05
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5th Sep 11 at 17:00   View Garage View User's Profile U2U Member Reply With Quote
OK, if you had 173bhp at the wheels. What would you say it had at the fly?

There are a lot of theories for calculations etc out there so intrested to see what power you think it would be (approximately of course).
Corsa_Sport21
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Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
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5th Sep 11 at 17:06   View User's Profile U2U Member Reply With Quote
FWD or 4wd??
Corsa_Sport21
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Registered: 13th Apr 08
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5th Sep 11 at 17:08   View User's Profile U2U Member Reply With Quote
If FWD, i would say just over 200bhp @ the fly.
Gary
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5th Sep 11 at 17:48   View Garage View User's Profile U2U Member Reply With Quote
Thought it was around 20% transmission loss?

That also depends on the condition of the box
Gary
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5th Sep 11 at 17:52   View Garage View User's Profile U2U Member Reply With Quote
That's for 4wd. Fwd is around 15% so that would be just about of 200 at the fly

[Edited on 05-09-2011 by Gary]
Toby
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5th Sep 11 at 18:09   View Garage View User's Profile U2U Member Reply With Quote
FWD and I have been working of 15% but have heard some many different ways of working it out just intrigued
Gary
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5th Sep 11 at 18:17   View Garage View User's Profile U2U Member Reply With Quote
Was told 15% by chipwizards and he tunes 911 track beasts so trust his word
sand-eel
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5th Sep 11 at 18:33   View User's Profile U2U Member Reply With Quote
I would say 210bhp
Gary
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5th Sep 11 at 19:29   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by sand-eel
I would say 210bhp


A bit high working on 15%.

Plus guessing its an XE so most likely a 15-20yo box so most likly higher %.
broster
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Registered: 6th Dec 02
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5th Sep 11 at 19:54   View Garage View User's Profile U2U Member Reply With Quote
200ish
depends on the following:
Tyres - track or road
Tyre pressure - low or high
any chance on a slightly sticking brake calliper


you can't calculate it after the only way to get a properly "calculated" flywheel figure on a rolling road is to use a dyne and software that works out transmission losses on a run down where the car is left to coat down to idle our of gear, that works out the drag.
Corsa_Sport21
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5th Sep 11 at 20:01   View User's Profile U2U Member Reply With Quote
As a general rule of thumb i have always went by add 10 to the wheel figure then divide by 0.9.That gives you an estimate for the flywheel figure.

Obviously it won't be bang on but RR figures never are and this just gives an idea.
Toby
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5th Sep 11 at 21:35   View Garage View User's Profile U2U Member Reply With Quote
Its a 2l duratec from the ST and it was on a hub dyno so rules out a lot of factors as mentioned by broster
broster
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6th Sep 11 at 06:36   View Garage View User's Profile U2U Member Reply With Quote
transmission losses are less wit ha hub dyno as you have no tyre contact to worry about etc, what modifications have been done to the engine to get it to that power?
great engine to tune the duratec, we built a 2.3 on throttle bodies which did 330bhp, not a cheap build but man did it fly!!!
Toby
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6th Sep 11 at 06:47   View Garage View User's Profile U2U Member Reply With Quote
Moutune MR200 kit which im sure you know what it consist of

[Edited on 06-09-2011 by Toby]

 
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