wheel to fly percentage loss?

does any one know the percentage loss through transmission for a auto?

is it 20%?

I thought it was around the 20% mark. Trying to work out something??

yep my bhp figure they only had it set up on dyno for a manual for percentage loss and said its roughly the 20% for a auto but i want to know exactly

What did it make at the fly?

and im not great at maths so if i have the wheel figure how do i work out fly?

i no fly to wheel is (figure)/100 x percentage

how do you do it the other way?

i dont no i only have wheel values and torque wheel values i want to know fly

What did it make at the fly?

You mean wheels

I think he is trying to figure out the flywheel.

Don't worry about the fly Lee, it is meaningless. Unless of course it is for the pub

and im not great at maths so if i have the wheel figure how do i work out fly?

 

i no fly to wheel is (figure)/100 x percentage

 

how do you do it the other way?

Divide whatever figure you have by 0.8 and that will give you the flywheel.....ish.

for pub

where did u get 0.8 from?

You mean wheels

 

I think he is trying to figure out the flywheel.

 

Don't worry about the fly Lee, it is meaningless. Unless of course it is for the pub

No I meant fly, His original question was "Wheels to fly loss"

The wheels to fly loss is erm.... nothing, its gain so I was assuming he had his fly figure but wanted to know what he was running at the wheels minus the 20% or so loss

for pub

 

where did u get 0.8 from?

I pulled it out of thin air

20% loss means 80% of your original figure (which you don't know). Easy way of doing that is to multiply and divide that figure by 0.8. If you want to calculate a 20% loss you multiply by 0.8, if you want to calcualate a 20% gain you divide by 0.8. This terminology is wrong but it is a simple way of explaining for you to understand. The loss & gain are vice versa, just ignore this bit.... its for the hole pokers

You could do...

500/80*100 to get 625fwhp (the forumula you mentioned earlier re-arranged to work out the gain rather than the loss)

or as I have suggested, and much simpler

500hp/0.8 = 625fwhp

Saves lots of hassle

No I meant fly, His original question was "Wheels to fly loss"

 

The wheels to fly loss is erm.... nothing, its gain so I was assuming he had his fly figure but wanted to know what he was running at the wheels minus the 20% or so loss

I read the question as him wanting to figure out the flywheel figure as he already had the wheel figure, hence my correction He doesn't know what it made fly, that is what he is trying to get.

cheers scott, im writing up a new post now so keep a look out

I've just worked out my auto TT to be 16%.

376 fly to 316 wheels.

I really must get mine dynoed again soon.

I've just worked out my auto TT to be 16%.

 

376 fly to 316 wheels.

 

I really must get mine dynoed again soon.

It won't be 16% bud. It will be a fair bit higher so your FWHP will be even more than you think. The FWHP figures you get from a dyno operator are faked and based on whatever they put into the machine. If they have put it in as 16% you will have figures to show this. If they put it in at 90% your FWHP figure would reflect that.

WHP is the only one that matters. Someone would need to take the car and put it on a transmisison dyno thingymabob to work out the exact transmission losses of a car. On the Supra I think the given is 20-22% for auto and 16-18% for manual.

Just to add, I think RR dyno's try to calculate the transmission loss based on the deceleration after a peak. Again, it is a bit of a poke in the dark. Not 100% sure on the specifics of all this. Just say 400hp for the pub

Oh.

EDIT: 20% loss would mean 395bhp.