Viscous LSD, mines gtec'd and i get no spin at all on a decent road.... my tests next sunday at the pod....

The Coupe "LSD" is a viscous coupling on the driveshafts, not a proper limited slip diff

However, it does make a difference, as it reduces the chance of a single wheel spinning

yes.

The limiter stops boost rising too quickly in all gears, not just 1st and 2nd. As 1st and 2nd gears are the only ones to zip through the rev band fast enough to trip it, they are the only gears that are affected by it though. If you could get enough power in a Coupe on a standard chip to make it go through 3rd gear as quickly as a standard car does in 2nd, then it would back off the boost. The same in 4th and 5th, but that would require a truly monumental amount of power I'd have thought...

As the limiter function will reduce boost to around 0.6bar in 1st and 2nd gears it will have a huge effect on maximum torque, but it won’t make anything like as much difference to peak power, as this will be made when boost has trailed off anyway. It should provide about 20-25lb/ft in 3rd, 4th and 5th gears, but probably 70-80lbs/ft in 1st and 2nd gears. Power will be increased by 20-25bhp in all gears.

I reckon the chip would give us a 14.2 ‘on road’ 1/4 mile time at around 104mph. This would compare to regular magazine road test 1/4 times. On a drag strip this would be more like 13.9s @105mph. 0-60mph will be around 5.6-5.7secs.

For me the problem is not with launching the car from standstill.

The problem is when the boost comes in 1st gear.

If I'm rolling at 5mph, and give it full throttle it will grip fine from 5 to 20mph, then the boost hits and an instant later it's bouncing off the limiter with the tyres spinning like mad. Might as well be revving it in neutral.

I dont drive it like this, I only ever use part throttle in 1st gear, but I cant help but think what the 0-60 time would be if it could grip a bit better, it feels to me like it would be amazing....

To get a proper launch you need to launch the car on boost. With your power then half throttle is about right once the clutch is up.

racelogic traction control is part of the answer I think.

IMO something else to go wrong (and they do). There have also been several instances of cars doing 1/4's faster when they have turned it off.

I think you simply need a better EBC. I think the AVCR has gear specific gain/set which should easily fix your low gear traction problems.

What I was wondering is what my 0-60 time would be if I could put down full boost in 1st gear without spinning, not how to reduce the boost in 1st gear

Ok, what power are you running?

314bhp, 300lb/ft

If you're talking a 4wd clutch-sidestepping-monster-launch, then i see no reason why it wouldn't be 4.3-4.6 seconds. If you mean front/mid engined rear wheel drive than I'd say something like 4.7-5 seconds. We have quite a long second gear compared to even cars of equal performance to your coop when rolling. With a 65mph second ratio, it'd be a tenth or so less I'm sure.

People just don't get how quick a coop is because of it's relatively poor 0-60mph time. For reference the S15 200sx put in a 5.5 sec time but was then dead level with the 20vT all the way to 130mph and it had 30bhp more and weighed 80kgs less!

Of course if we did have a drivetrain better suited to launching, we'd be heavier and have more tranny losses. Performane would probably more like a bugeye WRX then