Just dropped a deposit on some M Power - Trackday Project Car

Bear in mind we're talking 90 seconds sprints here.

None of those tyres will compare to soft V70's (or another soft compound tyre) over that short distance. For circuits, different story but I have AD08-R's and I would certainly not be recommending them as the best tyre for sprinting.
 
HummuH1 said:
Bear in mind we're talking 90 seconds sprints here.

None of those tyres will compare to soft V70's (or another soft compound tyre) over that short distance. For circuits, different story but I have AD08-R's and I would certainly not be recommending them as the best tyre for sprinting.
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Before the sprint, are you allowed to say drive your car around, warm it up etc or do you literally jump in a cold car, engine, tyres and then just thrash it up the hill.

Never done sprinting so no idea, I can only give feedback on how I have found the above tyres on the road and for me the AD08-R had the most initial grip and also worked the best in single digit temperatures, again on a road car on the road.

If you can warm the car up, drive it around before the sprint then yet definitely go for one of the sticky tyres and on the V70 my mate was using medium compound, not soft which of course makes a difference.
 
The events we do specify no tyre warming. That means no tyre blankets, no razzing around the paddock and no spinning the wheels on the way to the start line.

We do get the odd one who tries it on and feels the need to "go for fuel" or something then come back and get straight in the queue but they usually end up being made to wait around for long enough that the tyres cool again.

Engine temperature is less of an issue, we've only got about 30minutes between runs so it never really cools (especially once you've sat in the queue for a few minutes). The exception is the first run after lunch which I tend not to take too seriously now as it's always slower with a completely cold car.

There have been a couple of people try the V70 who seem to have got on OK with them. Not sure if they've been brave enough to go for the super soft or not. I think the range of sizes has improved since I last looked at them so may give them a try next time. I've only recently bought tyres so it may be a while before I'm shopping for them again.
 
Trial fitted some 12mm spacers I had on the rear, looked brilliant and should just about clear. Waiting on some new bolts to arrive and shall fit them and road test. If all is well shall take some photos, if not will get some 8mm ordered. :)

Might cause a little more understeer widening rear track but hopefully won't be noticeable as looks so much better with rear wheels spaced out a little. :)
 
Hi there

Had enough of my rear wheels looking a little lost in the rear arches, so put my Eibach 12mm spacers on with longer bolts:-


Before:-

BEE78D95-FEB9-4FEE-9DCE-E5C17A8959AE-9613-00001682D3B36427_zps9cb751b8.jpg



After:-

729CC253-354D-45A9-9741-D9EE4455B4A4-9613-00001682D67E5EEF_zps5cdde57b.jpg




Looks even better in person, not sure how it will effect handling but initial drive and seems to be no rubbing. :)
 
adam cool dude said:
You are probably aware of this but you do understand that increasing rear track will also increase under steer.
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Yup, had a good drive, can't really tell any difference on the road understeer wise as I've got the car setup so it gives a hint of understeer at the limit at exiting a corner which can be transitioned to oversteer with loud pedal action.

Overall on the road it feels a little better and looks much better, the track will be real test and if understeer is an issue they are removed easily. :)
 
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Gibbo said:
Yup, had a good drive, can't really tell any difference on the road understeer wise as I've got the car setup so it gives a hint of understeer at the limit at exiting a corner which can be transitioned to oversteer with loud pedal action.

Overall on the road it feels a little better and looks much better, the track will be real test and if understeer is an issue they are removed easily. :)
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There's lots you could do to make the car less under steer prone without having to go back to a narrower rear track anyway, such as a stiffer front ARB, or softer rear ARB.

I think it looks great with the rear arches properly filled like that Gibbo. Don't change it back!
 
adam cool dude said:
That promotes under steer. You need them the other way round to promote over steer.
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This.

If its a major issue I just buy an adjustable slightly thicker rear ARB. Am currently running CSL version which is 22.5mm in the rear so an adjustable 24mm rear one would do the trick if I feel I want to fine tune the balance further. :)
 
Hi there

Door cards are done and look superb, car now looks very nice inside:-


photo-9.jpg~original


photo1-6.jpg~original





I shall probably put back in the front window pillard covers and the fabric roof as it weighs pretty much nothing and it will look look pretty normal inside. Essentially what an M3 GTS would look like inside, just need the cage now to finish it off and maybe CSL airbox if I can get a deal. :)

With the rear seat delete in place car on a cruise is pretty silent now, no squeaks or rattles and road noise vastly reduced and when you accelerate hard you can hear a lovely exhaust note, very CSL sounding in the car. :)

Very happy with the car, its quicker than my CSL and more fun to drive both road and track now. I've built a car that performs superbly well on track and is still a nice place to be on the road and very usable.

Shall need to get car re-weighed but I'd guess its around 1330-1350kg, a cage will be around 20-30kg additional.
 
Looks really good, I like the spacers on the rear!

Do you have any plans to change the steering wheel out of interest? I suppose it would be a pain to get the paddles changed (assuming they move with the wheel?)

We need a video the prove the sound! :)
 
Tomcat825 said:
Looks really good, I like the spacers on the rear!

Do you have any plans to change the steering wheel out of interest? I suppose it would be a pain to get the paddles changed (assuming they move with the wheel?)

We need a video the prove the sound! :)
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Videos are in previous post. :)
 
Hi there


OK trial fitted some stock 18" wheels to rear with Conti 255/40/18 tyres to see if it fits without rubbing and 12mm spacers and all is OK. Pictures:-


photo2-3.jpg~original


photo1-8.jpg~original



Gonna try on front tonight, to see if they fit, if they do this means when I have worn the cups down I can then fit SuperSports in 255/40/18 no problem all round on my Apex 18x9 wheels.

For comparison sake, the Apex with 265/35/18 cups weigh in at 20.4kg whereas as the stock M3 wheels with 255/40/18 conti's weigh in at 25.4kg.

That's 5kg saving per corner, 20kg overall but its unsprung mass so more like getting a good 50kg out the car. So in a way its a shame that its not the Apex wheels getting the slick tyres as that would give the best track performance/times. Just need one more 18x9 stock M3 wheel now and then I have four and can get some slicks fitted. Then the Apex will eventually bit fitted with SuperSports and will be my road and wet track tyre setup. :)


One more picture of door cards:-


photo-10.jpg~original
 
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