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Discussion Starter · #1 ·
Hi guys,

For Evo VIII:

Ok here's my delemma. Tomorrow is the final round of MC Motorsport, which is a season of Motorkhana racing. It's going to be very wet and cold. Some of the turns will be carrying speed of around 120km/h and other are single cone hairpins.

I have a set of RE540 R-spec tyres. 2 x about 10% tread (you still see the tread - just - so is more of a slick) and the other 2 x about 60% tread which are in the their prime.

the problem is thus. Do I run the worn tyres on the front or rear?

I just had a quick test drive with the worn on the front, and while the rubber is still cool the front is just creating a level of understeer more like a slide. If they go on the back I fear the front will grip too much and the rear will slide making the car unpredictable and this will rely on the AYC and ACD to control the car. At the moment I am leaning for the worn tyres to be on the front as I think it is more predictable and driving smooth lines will reduce the slide.

Am I wrong in my thoughts?

Advice will be greatly appreciated.

Dan
 

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put them on the rear,
take out the ayc/abs fuse & run as an 'open diff' (assume this is acceptable in the rules ?)
that way you can be tail happy with a bit of control...without the electronics kicking in ?
 

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xlr8 said:
put them on the rear,
take out the ayc/abs fuse & run as an 'open diff' (assume this is acceptable in the rules ?)
that way you can be tail happy with a bit of control...without the electronics kicking in ?
Open diffs don't really give any control though do they?

You will be slower with an open diff than you will be with the SAYC working.

My advice in your case would be, if it's wet, you need some tyres with some tread on them. tyres with a just visible tread pattern are going to be pretty useless in the wet, front or rear.
 

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xlr8 said:
no...not if you've become used to ayc etc
but then I'm used to a Lancer Turbo with big bhp
= = rear wheel steer ....
......so naturally i'd go for an open diff in an autotest ref: above starter question ;)
:D
Sorry, can't agree, any kind of limited slip diff will be better than an open diff in any autotest with reasonably fast cornering (i.e not just spinning around cones in first)

And the original question was ref tyres, not diffs ;)
 

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Weebl said:
Sorry, can't agree, any kind of limited slip diff will be better than an open diff in any autotest with reasonably fast cornering (i.e not just spinning around cones in first)
And the original question was ref tyres, not diffs ;)
ok...thinking more about it....you're probably right
& re: the starter question I know it was about tyres....but my answer was a ref: to them being put on back

more fun with open diff ....although as you say... not as quick
:D

thx
tell us how you get on....
 

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Discussion Starter · #7 ·
Cheers guys!

I thought the UK (wet weather specialists) would be in the know. Very rarely do we have forcasted heavy rains here for motorsport.

The round is in the morning (already 9pm here) and these are the only rubber (besides street tyres) I have for the day.

I am going to go back down to the garage and swap the worn ones to the rear.

regarding the diff then, which ACD mode do you reckon? I was going to stick with SNOW, but AFAIK the Tarmac mode is the most open prescription for the ECU.

Thanks again
 

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If you have heavy rain and you have well treaded road tyres, use those :)

They will provide more grip than almost slick track tyres due to the fact they can shift water out of the way. If the road is damp then stick to the track tyres, if you have standing water, use the road tyres.
 

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Discussion Starter · #9 ·
The track doesn't pool water which is a good thing.

Just drove the car with the slipperies on the rear and uder trottle the rear is jumping out on the corners. I think the morning will be getting the pressures and coil-over rates sorted before any more tyre changes.

If it doesn't stay in line, it's going to good to watch at least :D
 
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