What % transmission loss?
27 November 2009, 05:44 PM
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What % transmission loss?
Hi can anyone hazard a guess or know the % of bhp/torque loss due to transmission?
had dyno today and car was producing 211 bhp and 224 torque at the wheels
would like to know fly figures too
many thanks
had dyno today and car was producing 211 bhp and 224 torque at the wheels
would like to know fly figures too
many thanks
27 November 2009, 07:28 PM
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27 November 2009, 10:47 PM
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mmm interesting question......
'Matter' might not be the correct term, I am interested as all the dynos i have done before have been pulley figures:
YouTube - mr2 dyno run
so i have no idea how wbhp relates to pulley hp on an AWD car, also different rollers give different figures, some apparently tweak figures to make things look better.
Also interested to see what the experienced people on here make of the graph as i bet just by looking at it they can tell what is wrong or right, for example the second run was made about a minute after the first one so heatsoak aside why is it 38hp less and 65lbs/ft torque different and finally if there is something wrong then hopefully i will either a) find out what to look at with respect to the car or b) work out why i spent £50 for two runs that weren't correct
hope that answers you question mate
'Matter' might not be the correct term, I am interested as all the dynos i have done before have been pulley figures:
YouTube - mr2 dyno run
so i have no idea how wbhp relates to pulley hp on an AWD car, also different rollers give different figures, some apparently tweak figures to make things look better.
Also interested to see what the experienced people on here make of the graph as i bet just by looking at it they can tell what is wrong or right, for example the second run was made about a minute after the first one so heatsoak aside why is it 38hp less and 65lbs/ft torque different and finally if there is something wrong then hopefully i will either a) find out what to look at with respect to the car or b) work out why i spent £50 for two runs that weren't correct
hope that answers you question mate
27 November 2009, 10:51 PM
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sorry simon i forgot to say that i went here Janspeed - Home very nice bunch, showed me around the factory etc was good but just wanted to check the figures as i felt something might be wrong, they had one fan in front of the car with the bonnet closed and it was angled slightly down, dont know if that would affect it, does anyone know another RR in somerset/dorset? so i can compare
Last edited by baz995; 27 November 2009 at 10:53 PM.
27 November 2009, 11:32 PM
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28 November 2009, 09:40 AM
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Yeah TMIC and one fan at the front with the bonnet closed, would you know any more around the south west at all?
thanks for the replies
Last edited by baz995; 28 November 2009 at 09:45 AM.
28 November 2009, 10:23 AM
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Alright mate. I use Surrey Rolling road. Im hoping to get my car mapped on there in Dec/Jan (Got to talk to Simon) Come along for a convoy when i go mate.
Powerstation isnt to far either
Powerstation isnt to far either
28 November 2009, 10:56 PM
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yes powerstation mounts fan to tmic..
Surrey Rolling Road use a nice big fan..
Dave,
17th december any good to you my friend?
Simon
Surrey Rolling Road use a nice big fan..
Dave,
17th december any good to you my friend?
Simon
29 November 2009, 12:07 PM
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01 December 2009, 08:02 AM
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The % transmission loss is entirely inaccurate IMO.
The adage is that the dyno measures power at the wheels, but having had my car on a few rollers there have been huge differences in the wheel figures but the calculated flywheel figures have been fairly close.
DD tend to show lower wheel figures but use something like 23% to get to a flywheel figure
Dastek seems to show higher wheel figures but calculate losses.
Maha wheel figures were ridiculously low.
Which one is right ?
Those graphs look strange, there is a big drop on the first run at just under 6k like the IAM shot down and reduced boost and timing - then stayed at that level for the second run. This is right at the point where the bhp is still increasing which may explain why the peak torque is higher than the peak bhp.
Unfortunately the AFR graph is meaningless.
I'd take it to a proper set up with proper cooling and decent/useable graphs Baz.
The adage is that the dyno measures power at the wheels, but having had my car on a few rollers there have been huge differences in the wheel figures but the calculated flywheel figures have been fairly close.
DD tend to show lower wheel figures but use something like 23% to get to a flywheel figure
Dastek seems to show higher wheel figures but calculate losses.
Maha wheel figures were ridiculously low.
Which one is right ?
Those graphs look strange, there is a big drop on the first run at just under 6k like the IAM shot down and reduced boost and timing - then stayed at that level for the second run. This is right at the point where the bhp is still increasing which may explain why the peak torque is higher than the peak bhp.
Unfortunately the AFR graph is meaningless.
I'd take it to a proper set up with proper cooling and decent/useable graphs Baz.
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