13 replies to this topic

[philc]

Following on from my x pin questions. the reason on needed advice on this was because at present i have a sailsbury lsd fitted. when i got the box it was already their so i thought i would keep it in as it would improve traction etc etc. i was hoping to use this on the road and on track days. anyway. i have had it all set up and rolling roaded which is suggesting i am loosing 27hp through transmission, which is a lot. it is suggested this loss is due to the lsd as a normal diff it is expected to loose around 16bhp. though i am hoping once the engine has been run in and things have loosened up this figure may change. can anyone advise on this. thanks phil....

http://www.quaife.co...fferentials.htm

Edited by philc, 27 September 2006 - 09:59 PM.

[Alburglar]

salisbury lsd's are medieval and made of stone. Get a proper quaife ATB as it's perfect for road/track use.

[philc]

i have looked on the quaife web site, sounds good for all rounf traction, have you experienced this and noticed a difference between a 4 pin?

[Guess-Works.com]

I know a couple of people who run ATB's, and I would suggest, best thing since sliced bread.....

As for the transmission loss, unsure how the LSD construction could actually loose you power, on a rolling road the wheels are straight on, therefore will act no different to a normal diff with power being supplied equally to both wheels. Also what final drive do you have on the diff, that may be a contributing factor...

[philc]

3:44 final drive

[Guess-Works.com]

can't see how that could make much difference either...

[philc]

Tough one on the loss then, but from another forum this appears to be a common loss, though all rolling roads are different. still deliberating to change the diff to a 4 pin or quaife atp?

[mini93]

i dunno about the other forum but guesswords is living book and knows his stuff i sure would trust him

[Jammy]

Are you aware of the cost of the Quaife item? More or less £500 for the diff, then you need to use Quaife outputs, and I believe a Quaife crownwheel!

[philc]

i am aware of the cost and i need the outputs, though i can use the diff i already have. i am trying to decide that pro and cons. afterall traction is very important both on the road and track

*multiple posts removed GW*

Edited by GuessWorks, 27 September 2006 - 08:56 PM.

[miniboo]

Just a few extra posts LOL

[philc]

just a few when it went all pete tong

[Alburglar]

I know a couple of people who run ATB's, and I would suggest, best thing since sliced bread.....

As for the transmission loss, unsure how the LSD construction could actually loose you power, on a rolling road the wheels are straight on, therefore will act no different to a normal diff with power being supplied equally to both wheels. Also what final drive do you have on the diff, that may be a contributing factor...

Like I said. It's because salisbury diff are ancient and made of stone, twigs and fire and brimstone. I'm not sure on the precise engineering, but what I do know that it took myself and three other guys to push a 600kg race car with GKN salisbury LSD! Obviously the diff design is using up engine power due to a fair bit of frictional loss. Must be a pretty outdated design.

Phil: All in the quaife atb will cost about £1000 and yes they are the absoloutely brilliant. My friend had one in a stripped out mini on 10s and it was awesome!

[philc]

i agree with what you say here, and i would agree that is were the loss is, perhaps it is time to change it