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Have just checked in Challenge racer manual - rears are coil overs- and bottom mount is amazingly still single shear. Spring rates are F 1000 lb/in and rear are 391 lb/in (about in proportion to weight distribution - as back end will weigh nothing in race trim). Sidewalls will be virtually...

Chris, i would check the ratio before fitting, it could be very much slower than the Trophy's.

Peter Ginger Just make sure that whatever you do involves someone ensuring that F & R are matched. That is why Mark Fish or possibly AST makes most sense. As a tyre compromise you might consider Hankook RS2, which have track construction with road compounds. If someone could measure the rear...

R26R is on track tyres - generally worth 2 seconds in 60.

As I was driving between companies it occured to me that a quick explanation of why stiff springs are a problem, particularly for road use, might help. Bascially road tyres have soft sidewalls compared with track tyres or racing tyres. If the springs are too stiff they could end up being...

Peter Ginger Going to 650 lb front springs is insane unless you are running a dedicated track car with slicks and a strong LSD and can be sure that the tyres are up to temperature. What you must remember is that the Elise has a double wishbone set up with quite steeply inclined dampers and as a...

Chris - PF97 are meant to be very good, but be warned the dust is a nightmare and and very hard to remove/corrosive. Have you looked at carbotech - several of my competitors use them.

Kumho recommended that I set their track tyres - V70A at 26/24 - this seemed fine, but I never did any long runs. The longterm issue is that track tyres are currently marked as road legal, but as they generally come with 4-5mm tread and minimal tread pattern would fail any aquaplaning test...

Steve I fully understand your point entirely - the frustration is that the MSA only allow you to run it on occasions where R888s or A048 are also allowed - and then it is way off the pace. Hankook should have got it homologated as a 1A tyre (which the tread compound and depth would allow - it...

Colin, Looks nice - even less rear droop! Glad to see the quick and easy mount for the timing strut - they seem otoend up tight in the upright position! BTW I made mine out of a black plastic seed tray!

Trouble is that the RS2 has a road compound, so is not in the same league as a track tyre and yet is 1b listed by the MSA. Probably a good compromise for track days where relatively high mileages are involved.

Rose joints are a trade name for spherical bearings (known by the J's for some reason as pillow balls!). For road use they may have limited life as are not fully sealed - need PTFE coated type if possible. Strut brace may help a bit at the front, but frankly with normal spring rates they are...

On the hills, in the production classes, the cars to have in terms of results are; Imprezza - needs sensible mods, but as most parts can be UK sourced not anywhere near as expensive as going the Jap route - on a wet day they are up with the single seaters! Need driver controllable centre diff...

Beware that very large callipers will have much more piston area than standard which could upset the brake balance and also increase pedal travel

BTW re tyres - can you tell if the temperature is evenly spread across the tyre; some DC5's run massive camber to get an even spread across the tyre (up to 7 degrees - must admit I am not a fan of such extremes) - certainly the Clio racers run over 3.5, and that is with very very stiff springs...

My front running Evo & Subaru colleagues all run CarboTech pads on the hills. I tried Pagid RS15 which worked very well, but suffer from dust build up on the disc causing judder - you would need drilled or slotted discs to get the best out of them. The quickest Trophy I have ever seen was on...

Power station might be a possible. Tewkesbury iirc.

From past objective experience the 182 number - about 179 in real bhp is very optimistic - won't go into all my past posts, but suffice to say mine started at 157 at about 3,000 miles - custom map was the main source of improvement in getting it back to 180 ish, but it also had modified feed to...

Beware the Db test!

Colin - Shiftspark. These cold tyres are a real problem. The DC5 was a total nightmare on cold tyres and was very loose at the back, even under power. Seem to have made progress (2.8 secs in 52 - quicker than the T on road tyres) by going softer at the rear** and running quite a lot more rear...

Damper Valving Just a few notes – in view of past comments I will try to keep it short. Dampers are not springs, basically they control the rate of movement, particularly in roll – an undamped car will bounce like a pogo stick. However it is possible for really stiff dampers to give the effect...

But big - same size as a 3 series - which is why I bought a DC5.

The Tesla is straight electric (we did the prototype transmissions)- no reason why the electric motor cannot charge the batteries on the over-run.

The available energy at any one time depends on the size of the batteries, as there is a limit it pays to keep the weight of the batteries down, so it is a slightly circular question. It might be that there could be more rechargings per lap and hence more use - from what we can gather there...

There are several road car projects already happening. we are involved in a government funded research project with Jaguar and several other parties for a flywheel system - target date, if successful, for production circa 2015. Note that in China several teams have taken it off - for racing the...

Don't forget that the Trophy 's front strut has a 1:1 installation ratio, whereas with wishbones the elise has an effective ration of roughly 2, so 350 springs on the elise are equivalent to 175 on a strut etc.

Matched inlet, cams and generic remap. no change at all below 4,300 - at max rpm about 6 bhp from the package. Custom remap found quite a lot of power throughout the range - will never know the contribution of the separate items.

All the corners are relatively tight - one side is a series of left right flicks, with a long 180 onto the retiun straight - ideally you should do at least two laps at a time, it was understeery in Evo5! They do have good school days.

Re: Koni Adjustable rear Shocks Ben You are doing absolutely the right thing - short of a test on a track. For a previous car I found that the best answer was to err slightly on the soft side of what I thought was right, and then the car did not produce any surprises. Similarly on the same car...

Chris - don't forget that changing the camber also changes the toes, in terms of a quick adjustment at the track. Also suprised to see that you were running toe-in - should only be necessary with much more camber or much lower ET.