Rwhp & Diff Ratios

[Don Dada]

Hi guys an gals

Was havin a conversation with a friend today and a question was raised which had me thinkin.

Do different ratio rear diffs give different max hp reading and also a different curve on the dyno? Eg. a 3.9 vs a 4.3

I,ve been experimenting with some mech diffs latley an wanted to know if i can use the dyno to "see" which diff accelerates faster.

Is this possible?

Thanks in advance

[paulr33]

diff ratio and wheel size both affect rate of acceleration and power made when measured through a wheel dyno

this is negate by using a hub dyno (size of wheels)

is 17" vs 19" there is usually a power difference

much like with acceleration, smaller wheels accelerate quicker

[Don Dada]

So i guess with wheel size being constant here i can use the dyno to "see" which diff accelerates quicker and also the top speed it produces.

[paulr33]

correct

[Don Dada]

thanks for the info

[LRyder]

Would be interested to see some dyno readouts of the different diffs. Post up your results when you give it a go.

[Taxi_This]

9/11 diff gears in my 33, definitely revs quick.

1st gear is useless, 3rd is great and highway driving is noisy and expensive.

Would recommend!

[Pal]

i done a conversion a couple of years ago. have done everything exept the auto diff. have to do about 109 to sit on 100 km/h. no traction in first good for overtaking in 3rd and 5th is a shave under 3000rpm at 100km/hr. dyno inc. basic mods and highflow