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Author Rolling Roads
BarnshaW
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Registered: 25th Oct 06
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20th Sep 11 at 11:40   View User's Profile U2U Member Reply With Quote
after reading alot of threads on other sites about this, is there general formulas to work out average results for cars? for example a car which goes on a hub dyno , is there general ways to work out the BHP for FWD/RWD/4WD cars etc?

vice versa for other types of dynos.
Gary
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Registered: 22nd Nov 06
Location: West Yorkshire
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20th Sep 11 at 12:11   View Garage View User's Profile U2U Member Reply With Quote
Say whaaaat?
adiohead
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20th Sep 11 at 12:23   View User's Profile U2U Member Reply With Quote
FWD cars - add 10 bhp to the wheel figure and divide the result by 0.9
RWD cars - add 10 bhp to the wheel figure and divide the result by 0.88
4WD cars - add 10bhp to the wheel figure and divide the result by 0.84

http://www.dyno-power-run.com/dynocalc.shtml
DaveyLC
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Registered: 8th Oct 08
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20th Sep 11 at 12:44   View User's Profile U2U Member Reply With Quote
Dyno figures are pub talk!
Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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20th Sep 11 at 13:30   View Garage View User's Profile U2U Member Reply With Quote
No.
Gary
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20th Sep 11 at 14:20   View Garage View User's Profile U2U Member Reply With Quote
Are so.

Well, bhp is anyways. There's more to a food car than power
corsa_breeze88
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Registered: 12th Jan 11
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20th Sep 11 at 15:05   View User's Profile U2U Member Reply With Quote
roller figures are never 100% accurate and bhp isnt everything
Gary
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20th Sep 11 at 15:13   View Garage View User's Profile U2U Member Reply With Quote
Its about the torque BHP is calulated from torque too so is even less accurate.

Guy i spoke to at ChipWizards admitted his rollers might read different to the true fuigure but are consistant and thats more important when tuning.
Eck
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Registered: 17th Apr 06
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20th Sep 11 at 15:19   View Garage View User's Profile U2U Member Reply With Quote
All Honda owners (including myself) will disagree about it being about torque RR's are very handy to find out if your car is running well!
chrisritch
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Registered: 2nd Sep 08
Location: Northants Drives: V40
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20th Sep 11 at 15:20   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Gary
Are so.

Well, bhp is anyways. There's more to a food car than power



mmmm food car
adiohead
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20th Sep 11 at 15:23   View User's Profile U2U Member Reply With Quote
Gary
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20th Sep 11 at 15:25   View Garage View User's Profile U2U Member Reply With Quote
iPhone autocorrect fail tbh
philip2
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20th Sep 11 at 16:01   View User's Profile U2U Member Reply With Quote
Fwd losses whther straight cut or standard type add 12-15%

Rwd as above but 15-18%

4wd like with evos could see 25-30% losses
broster
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Registered: 6th Dec 02
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20th Sep 11 at 16:25   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by philip2
Fwd losses whther straight cut or standard type add 12-15%

Rwd as above but 15-18%

4wd like with evos could see 25-30% losses


then look at what tyres people are running, what tyre pressures, are the brake binding slightly, what gear oil is being used, etc etc!

loads of variables.

We use our rolling to see what gains are to be had, or as a diagnostic tool/mapping tool and back to back testing.

a hub dyno is good for mapping as you get no wheel spin, great for high powered cars. not so great for working out transmission losses as it cant do a run down

[Edited on 20-09-2011 by broster]
Graeme
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20th Sep 11 at 19:14   View Garage View User's Profile U2U Member Reply With Quote
I went for a tour round Northampton Motosprort the other week and there rolling road facility is very impressive.

Were tunning Nick Mason`s 250 GTO at the time on there, They use it more for tunning that full on how much power you have etc.
Toby
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Registered: 29th Nov 05
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20th Sep 11 at 19:56   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by adiohead
FWD cars - add 10 bhp to the wheel figure and divide the result by 0.9
RWD cars - add 10 bhp to the wheel figure and divide the result by 0.88
4WD cars - add 10bhp to the wheel figure and divide the result by 0.84

http://www.dyno-power-run.com/dynocalc.shtml


Although this Bollocks as AET told me a different formula to use!
niallb123
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Registered: 10th Dec 10
Location: N.ireland.
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21st Sep 11 at 16:46   View User's Profile U2U Member Reply With Quote
RR's are good to find out if your car is runnin right and if there is any other faults with them weve ran 2 this year power figures are just a bonus.

 
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