Rebuilding my CUP260

[The_Cable_Guy]

@ade

If you found you were able to run close to the limit of the 308mm BBK, this is generally due to lack of stopping power on the rear axle. to try to get the right balance I went through several different options to increase the rear brake capacity. Without changing the pedal box and junking the ABS for a bias one, the I ended up with 315mm AP racing grooved discs all round. I also utilised the original 2 pot fronts on the rear and threw away the anchors that were the original rear callipers. I did find that I think I finally got to the amount of rear braking you can add to an S2 Exige and in reality the rear discs should have stayed as 308mm. the balance just seemed a little too rear biased in the wet with all 315mm discs.

i went for 308’s all round so hoping by what youve said the balance should be ok, maybe a little rear heavy, but hopefully that will be conpensated by the much heavier audi engine in the back.

[Muu]

@The Cable Guy

@ade

If you found you were able to run close to the limit of the 308mm BBK, this is generally due to lack of stopping power on the rear axle. to try to get the right balance I went through several different options to increase the rear brake capacity. Without changing the pedal box and junking the ABS for a bias one, the I ended up with 315mm AP racing grooved discs all round. I also utilised the original 2 pot fronts on the rear and threw away the anchors that were the original rear callipers. I did find that I think I finally got to the amount of rear braking you can add to an S2 Exige and in reality the rear discs should have stayed as 308mm. the balance just seemed a little too rear biased in the wet with all 315mm discs.

i went for 308’s all round so hoping by what youve said the balance should be ok, maybe a little rear heavy, but hopefully that will be conpensated by the much heavier audi engine in the back.

315 front 295 rear here, given that most people are putting proportioning valves in the rear lines I didn’t wanna go OTT on the back

[ade]

You can’t put proportioning valves on the ABS cars sadly, you can def go bigger than 295, but then you run into handbrake issues

I did have 315mm front 308mm rear for a while with knackered rear discs and the balance was fine. Long term I might well take off the 315 off the back and put on some 308 to give a spare pair of fronts

[Muu]

https://www.motorsportauctions.com/index.php?a=ap&addon=storefront&page=home&store=710&listing=33889

[ade]

@Muu

https://www.motorsportauctions.com/index.php?a=ap&addon=storefront&page=home&store=710&listing=33889

That would have done the job, didn’t know they made them.

[_lt]

Here is

[jonnyfox]

We have those in our Caterhams, work a treat and properly easy to adjust whilst on track.

If it’s an issue being a Frank fan boy I can delete this post

[_lt]

I finally

[Muu]

loving the choice of fittings

so how long do they give you on the tank before it needs re-certing?

[_lt]

5 years…

[Muu]

cool, thanks for sharing.

So does the clock start from when it’s made, or when it’s first wet?

[_lt]

The date

[_lt]

Lots of things

[Muu]

@<@¿@>

The date printed on the bag…so the date made…

yeah so lotus had a load for sale, but they must be useless by now

[_lt]

yeah so

[Muu]

@<@¿@>

@Muu

@<@¿@>

The date printed on the bag…so the date made…

yeah so lotus had a load for sale, but they must be useless by now

I think they had 3 for sale… I got one of them. But this is not the “standard” Lotus fuel cell…this is their “rally” tank…

Ah left over from the R-GT project? What date did they have on them?

[_lt]

I also got

[_lt]

[Muu]

Nice work on the scanning, will be very interested to see where you get to on it and how closely the calculated matches the flow bench.

[Ser]

How come you choose a rotrex? Considering all other over the top updates to maximize output