budget will only stretch to one or the other

which one is gonna reduce lap times the most when I get onto the track?

I would say a LSD for sure

Since fitting the quaife in mine it has soooo inproved cornering and being able to keep the pedal to the metal and letting the diff pull me out the corner.

did you fit a new clutch and flywheel at the same time?

No I didn't as i fitted that about 10,000mile before.

I would recommend changing it tho if the diff was being done.

Seriously tho the quaffie makes a big difference.

AST, BC, or JIC Cross coilovers

Depends on the track.

Tight and twisty - LSD will shave more time. Any corner where you use 2nd is total frustration without a Quaife. Even low RPM 3rd gear corners can benefit from a Quaife.

Fast sweepers only - coilovers will really allow you to lean into it.

Me - My FIRST mod was a Quaife. The frustration of spinning up the inside wheel on corner exit was just too much.

Alan

Cheers for the responses
thats exactly how I felt at donnington park spinning on the exit of half the corners
maybe it's my aggressive driving style I need to reign in but I don't think i'll do another track day until I sort this out.
Quaife it is and is the quaife worth paying double the price of other LSDs?

Dave

Depends on how long you plan on keeping the car. Quaife has lifetime guarantee - no friction plates to wear out.

Alan