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Dynapack rolling road
- Thread starter popie
- Start date
clio 182
yes
ITB'd MK1
it's no better or worse because people still apply guestimated loss figures.
Hub dynos do tend to give an "at the hubs" figure that's a lot closer to the flywheels figure. Often this is forgotten and normall rolling road loss numbers are applied. for example, if on a rollers you're seeing 30-35bhp losses, on a hub dyno, you'd see more like 10-15bhp losses.
Hub dynos do tend to give an "at the hubs" figure that's a lot closer to the flywheels figure. Often this is forgotten and normall rolling road loss numbers are applied. for example, if on a rollers you're seeing 30-35bhp losses, on a hub dyno, you'd see more like 10-15bhp losses.
clio 182
the only real advantage is elimination of slippage.
you cant get wheelspin on a hub dyno simply.
only a problem on high power stuff though really, more so turbo cars with aggressive power delivery, which can be difficult on twin drum rollers.
for a stock 172 you should be fine on either system
you cant get wheelspin on a hub dyno simply.
only a problem on high power stuff though really, more so turbo cars with aggressive power delivery, which can be difficult on twin drum rollers.
for a stock 172 you should be fine on either system
ITB'd MK1
I would have said more like 20bhp losses at that level
My clio's supercharged, as for losses he told me there was a 35 bhp loss from flywheel to hub????
I know there is a loss of 16% through the gearbox on normal rr. Just seemed mad how it was tested, with no wheels on.
clio 182
i thought the torque was high for the hp. i take it you dont rev very high? or torque drops sharply at high rpm?
The car revs to 7100, never really take it that high. But on the last rr i went to, the torque drops off fast from just over 6k. This time it was tested , i told him only take it to 6.5k because of this.
clio 182
aiii, that will kill the hp. (as hp = tqxrevs)
So i take it is a better way off keeping the hp by killing off the torque high up?
And saving my little french gearbox....lol.
clio 182
not sure i understand what your asking?
but to make hp, you need to carry tq as high in the rev range as possable. you dont need much torque, but you do need to keep hold of it as long as poss.
i.e a car that makes 200lb/ft@ 8k will make 304hp.
a car that makes the same 200lb/ft, but only holds it to 6k will make 228hp.
but to make hp, you need to carry tq as high in the rev range as possable. you dont need much torque, but you do need to keep hold of it as long as poss.
i.e a car that makes 200lb/ft@ 8k will make 304hp.
a car that makes the same 200lb/ft, but only holds it to 6k will make 228hp.
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clio 182
remember dynos only measure torque, they simply "calculate" hp
O now i see. I do get a little lost in rr graphs ,iv got 6 from yesterday and they all mean different things.
Its good to learn some thing new every day, car wise for me any way.
Cheers Ant
clio 182
no probs
heres 1 of mine from 2 weeks ago, note not much torque really, but quite high revs, makes good hp
heres 1 of mine from 2 weeks ago, note not much torque really, but quite high revs, makes good hp
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clio 182
c**ks on the table :quiet:
clio 182
lol, thought i would sneek it in, all in context of course
