Silvia Club of NSW

So i took my s14 to the track on Sunday for the first time and I have a few areas of opportunity one being the LSD/Diff situation.

The car currently has an s15 manual LSD and it was sadly lacking on the track.

I know with the s13/14 vlsd's you can shim them up but what options do I have with the s15 helical LSD?

Or should I just suck it up and go with a nismo/Kaaz 1.5 centre given I plan to keep the car for a while.

A mechanical diff will be the best cash you ever spend on your car...

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Disclaimer: If you have'nt worked it out by now I CANT SPELL FOR SHIT.

I'm thinking a mech 1.5way is the go as I have been doing some more reading and the issue with the helical diffs is that when either wheel leaves the ground you have zero drive. On the tight turns my car was lifting the inside wheel completely off the road.

The below info is straight off the quaife site.


Q: Do I need to set-up my car differently to use a Quaife diff?

A: To maximise the performance of your car when using a Quaife ATB Helical LSD differential, the vehicle needs to keep both driving wheels in contact with the ground at all times. If the car is set up for a standard 'open' diff, then no suspension adjustment should be necessary.

However, if you are replacing a 'locking' or 'speed sensing' type differential, adjustments will be required to prevent a driven wheel from lifting when cornering hard.

a mechanical LSD is the way to go,no question,cusco or nismo.

the other thing you might want to do is look at how much travel your suspension has. lifting wheels shouldn't happen to a street car.


Justin...

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STI - Made in Texas,not Japan.

I know exactly what is causing the rear wheel to lift LOL. 7kg springs in the rear on the HKS coilovers which have no suspension drop left and standard s15 struts in the front. Had a late front coilover blow out with no time to repair so I just stuck the s15 stuff back in the front.

Wasnt as bad as might think but the wheel lift was causing no end of grief

Pic below clearly shows the issue which will be resolved when I slot the rebuilt coilovers back in the front.

So any suggestions on what the hotness is for mech diffs. I was thinking a kaaz centre.

if your suspension is set up properly the S15 diff will work pretty well, but if you're doing serious track stuff get a proper LSD and the job's done

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The Engine Whisperer - fixer of things

any suggestions on brand mr dumhed?

KAAZ diffs are the cheapest and in my experience (have used Nismo as well) noisiest!
But they work just fine. I have a KAAZ solid.

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1996 180sx
1990 Silvia

thanks mate. I was reading the kaaz blurb last night and noticed there was 2 types being basic & solid. Is solid the go for track work?

PS. Noise is not an issue as its a weekender for me.

don't think I've seen any "bad" brand LSDs, but any of the usuals would be fine

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The Engine Whisperer - fixer of things

KAAZ are fine, ive had a 1.5 for a few years now.

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Disclaimer: If you have'nt worked it out by now I CANT SPELL FOR SHIT.