RS14 pads

[Modena Scotland]

When I was tracking at KH yesterday, the brakes started to judder really badly after a number of dry laps. Not very confidence inspiring. It was the first time I tried the RS14 on the track and though it bites much harder than the RS42, I found they give out a lot more brake dust

When I inspected the disks, the holes were completely filled with the dust, rather like the stock Brembo pads The RS42 was better in this respect.

The higher temperature may be the cause of this??? It did get slightly better after resting the car for a while. I hope this will be cured the next time but I doubt it.

Anyone has a solution apart from cleaning the disk holes? I don't really want to go back to RS42 as one of the front pads was crumbling away when Ali took them out, suggesting the pad was over heating.

[mwmackenzie]

Really Mass, over heating pads..... I can't think why hahahahahaha I passed you on the bridge last night on my way home from work, I was heading from Dunfermline to Edinburgh. Immediate thought was.... Damn I wish I had my helmet and a change of clothes with me!!!

Cheers

Mark

[Shug]

Juddering suggests uneven pad deposits. They do give out more dust - you bedded them properly before going right out on track though, yeah?

If they weren't totally bedded in, they'll probably be fine next time out. If it's uneven deposits, a skim of the disks would sort it. Also a better quality disk (for the time it spends on track is substantial) if you're still on the original Lotus items. Something like the larger AP belled disks & a spacer for the caliper would give a greater area for the heat to dissipate. Something Uldis did was make proper brake ducts, although that'd be more difficult on the S2 with the oil coolers in front of the wheels.

[Modena Scotland]

Shug, I've done 90 miles before getting to the track at varying speed and use of brake so it would have been bedded in. May be the ducting is the way to go.

Mark, sorry I missed you. You should have followed me to KH Did the guy buy your Esprit yet?

[Shug]

Ducting or bigger disks. Not sure how the S2 Exige is laid out under the skin, but I'd imagine there'd still be a way to duct from the main intake without hacking holes in crash structure. Uldis used the (dummy) side grills on the S1, which are used for oil coolers on yours.

Will try and find that thread if it's on SE2...

[jj]

Lots of good info here Mass.......


http://www.exiges.com/ubbthreads/showfl ... art=1&vc=1

[Modena Scotland]

Great JJ

[mwmackenzie]

I spoke to him last week . I have a slight problem though, My car is going in on tuesday for an engine rebuild so I need to wait until that is done then I'm hot footing it to get my lil black Elise!!!! I think my head gasket has failed? ..... AAAAAAAAAAAAAAAAAAAllllliiiiiii..... is the man so sort out my woes though

I very nearly did follow on but I didn't have my helmet and was in my suit, you'd not have noticed me in my non descript lil 206 puddle jumper

I'll need to keep my helmet and a change of clothes in my car for such occasions though

Cheers

Mark

[gdr]

Mass, I noticed after one damp drive back from KH, the disc holes were plugged. No problems at all after dry track days. I just wonder whether in damp conditions when brakes cool, there is enough dust being generated to stick together and create a paste which then bakes itself into the holes - maybe this happened to you on drive up to KH?
My previous car did get rumbly brakes on the RS4.2 pads after a few laps, but absolutely no braking problems with the big AP brakes on new car, they are the business on track and a lot better than standard.

[steve_weegie]

Mass, I had exactly the same problem with my rs-14 pads round knockhill when using eliseparts ali belled discs, and have the same problem with SBS pads on standard drilled discs on road runs.

Simply a case of the pad being too good for the disc IMHO - as shug suggests, ducting to the disc or some big bad AP rotors are the answer....

[meatball]

Mass,

My brakes give a vibration when very hot although it does not affect the braking performance.
Ali says it is due to the holes on the disc being filled....the only solution....clean them!
Kenny also has a vibration and he has grooved discs!
Your new pads will kill the discs quickly so when you replace them it might be an idea to see what options there are in terms of an upgrade?

I have also been told that it is down to just being out on track too long???

Let me know how you get on and I will make my own enquiries!

[roadboy]

RS-14s on Yota engined cars is a complete waste of time due to the ABS, no matter what discs you run. They will kill 295mm or 304mm AP rotors just as quick as standard ones.

Stick to RS4-2s and if you are overheating them (which I very much doubt) then run bigger discs.

HTH

Dan@JPS

[Cisco]

RS-14s on Yota engined cars is a complete waste of time due to the ABS, no matter what discs you run.

Dan, what is the reasoning behind this..I would have thought the 14s would be more consistent for longer irrespective of the ABS.

I was thinking about changing from 42s to Performance Friction 01's but I think they are similar compound spec to 14's.

From day one I have had some issues with the brakes on the Exige S..standard pads had no feel on the road and grumbled on track..change to Pagid 42's /Silkolene race fluid gave good result but after 20 minute session pedal was on the floor..now as 42's wearing down (finished after 4K miles) I brake 10-15 yards earlier on straights just in case..which is no way to run a chip shop.

Bit frustrating.. been thinking to disconnect the ABS as it is just a nuisance on track.

Take care,

Frank

[roadboy]

When the ABS kicks in it leaves uneven pad deposits on the discs causing massive vibration and the discs are junk. For some reason it is not a problem with RS4-2s.

If you are experiencing problems with RS4-2s then the only reall answer is better discs. It may be expensive but it will work out cheaper in the long run and you will have massively improved retardation.

If you can stretch to it I would recommend AP 295mm discs on the front and AP 290mm discs on the rear. Run these with RS4-2s and you should have no problems. If this is still not enough then you need 304mm discs all round but that gets very expensive and complicated and is IMHO a bit unnecessary for a track day car.

HTH

Dan@JPS

[tut]

ABS?
Servoed brakes?
Traction control?
Fly by wire throttle?
Leccy windows?
A/C?
Full carpet cockpit?
Sound deadening?
Cup holders?
6 speaker stereo?
980kgs?

No wonder the poor bugger won't stop.

Ok, ok, i'll get my coat.........

tut