Budget Rotor Advice for mostly track car - LotusTalk - The Lotus Cars Community
 
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post #1 of 15 (permalink) Old 10-24-2018, 04:58 PM Thread Starter
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Budget Rotor Advice for mostly track car

Need to replace rotors, and trying to decide what to get on a tight budget.
The car is mostly track, with occasional street use.
Running the stock AP/Brembo setup.

At this time I am not really concerned with more stopping power. I don't think I am yet using what I have to its full extent. My main objective is to be able to run long sessions.
Currently (running on worn out thin stock rotors) I start boiling fluid after 20 min at NHMS or 35 min at Palmer.

I decided to keep the OEM replacement Centrics in the back but need to decide on which 288mm solid 2-piece option to go with for the front.

The options I am considering:

1. elise-shop.com Aluminium Bell Brake Discs: $285
https://www.elise-shop.com/eliseshop...-p-503246.html

2. eliseparts.com ALUMINIUM BELLED DISCS S2: $335
https://www.eliseparts.com/products/...lled-discs-s2/

3. BOE HP Rotors: $525
https://www.boefab.com/collections/b...p-rotors-fixed

4. DBA 5000: currently on sale for $400

Only Elise Shop and DBA are specifying weight: 5kg and 5.5kg respectively. I wonder why others don't.

Do EP or BOE rotors offer any performance advantage over ES?
Are there any other budget options worth considering?

BTW, for the pads I am considering CL RC6 or Cobalt XR4.
Also thinking about BOE stainless steel pistons and brake lines.

Thanks.

Black/Silver 60th Anniv Elise

Last edited by artmt; 10-24-2018 at 07:34 PM.
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post #2 of 15 (permalink) Old 10-24-2018, 05:22 PM
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KNS brakes has the DBA5000 two piece slotted (fixed) on sale for $200 a piece right now.
That's what I've been running with XR2 (track) and Pagid blue (street) pads for some time and while I can't compare to the other options out there, I also don't have any problems or complaints so far.

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post #3 of 15 (permalink) Old 10-24-2018, 07:28 PM Thread Starter
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Thanks.
That's a good deal for DBA5Ks.
The reason they were not on my list is because the lowest price I saw was just under $600 for the pair.

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post #4 of 15 (permalink) Old 10-24-2018, 07:29 PM
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BOE last year had a black friday sale on all their rotors. It was a pretty significant discount. It may come up again this year...so maybe worth waiting for.

I got the fixed ones. Total weight savings of 8lbs over stock rotors.

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post #5 of 15 (permalink) Old 10-24-2018, 07:50 PM Thread Starter
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Do you know what the actual weight is?
Do you remember what the sale price was?

Thanks

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Last edited by artmt; 10-24-2018 at 07:56 PM.
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post #6 of 15 (permalink) Old 10-24-2018, 08:13 PM
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Quote:
Originally Posted by artmt View Post
Do you know what the actual weight is?
Do you remember what the sale price was?

Thanks
It was $345 front, $345 rear. Don't remember the actual weight to be honest.

I just know that their website claimed this:

"Save Weight with a full set of Evora rotors saving about 11lbs of rotational mass and a full set of Elise/Exige rotors saving about 20lbs of rotating mass!"

But actual weight savings turned out to be 8lbs difference between all 4 rotors combined.

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post #7 of 15 (permalink) Old 10-24-2018, 08:28 PM Thread Starter
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Thanks.
I saw the question come up before here and Phil was a bit vague, stating that most 2-piece rotor option run 11-12 lb, and his are consistent with that range.

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post #8 of 15 (permalink) Old 10-24-2018, 08:33 PM Thread Starter
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Quote:
Originally Posted by Mr.C View Post
KNS brakes has the DBA5000 two piece slotted (fixed) on sale for $200 a piece right now.
That's what I've been running with XR2 (track) and Pagid blue (street) pads for some time and while I can't compare to the other options out there, I also don't have any problems or complaints so far.
Curious why you chose XR2s.
Do you have ABS and power booster?
Have you tried less aggressive compounds?

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post #9 of 15 (permalink) Old 10-24-2018, 08:49 PM
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Quote:
Originally Posted by artmt View Post
Curious why you chose XR2s.
Do you have ABS and power booster?
Have you tried less aggressive compounds?
I haven't tried a less aggressive compound yet, other than Pagids.
I'm on stock ABS and master.
My local go to race shop recommended the XR2/XR3 combo, and I like it.
I can go way deeper before getting on the brakes compared to pagids, and modulation is still very good.
Wear is a bit higher (both rotor and pad), but that was expected.

If I die, my biggest fear is that my wife sells all my toys for the price I told her I bought them for...
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post #10 of 15 (permalink) Old 10-25-2018, 07:42 AM
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What fluid are you running?

Changing rotors is going to have only a minimum amount of change in your fluid boiling if at all?

What wheel boils first?

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post #11 of 15 (permalink) Old 10-25-2018, 08:13 AM
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Quote:
Originally Posted by artmt View Post
Currently (running on worn out thin stock rotors) I start boiling fluid after 20 min at NHMS or 35 min at Palmer.
As above, what fluid and when was the last complete fluid flush?

Are you normally aspirated or super/turbo charged?

The stock setup with fresh fluid typically does not boil on the track. You should also look into the stainless steel pistons from BOE as they will transfer less heat from the pad to the caliper/fluid.

I ran stock rotors, stock calipers, BOE SS pistons, CL5+ pads, and Castrol synthetic DOT4 (previously GL LMA, not the expensive SRF). With this setup, naturally aspirated, I never experienced any fade. Always consistent.
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post #12 of 15 (permalink) Old 10-25-2018, 08:18 AM
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To save on rotor life, try running the Cobalt or Carbotech brake pads. I have found them much nicer on rotors than the CL pads.

I will agree with Kevin, if you are boiling brake fluid, I would start by addressing that issue, too.

Later,
Eldon
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post #13 of 15 (permalink) Old 10-27-2018, 04:23 PM Thread Starter
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Thanks everyone.

Right now the prime suspect is thin rotors.
I am reluctant to do anything else until after I see how it runs with new rotors and pads. Although my mechanic is also recommending a new master. Will also do stainless pistons.

Getting back to the original question, there doesn't seem to be a reason not to got with ES 2-piece rotors - the cheapest option. But I will wait to see what Phil offers on black friday.

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post #14 of 15 (permalink) Old 11-06-2018, 09:30 AM
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What is your mechanic's reason for changing master cylinder? I hammered mine and never had an issue (anyone else had problems?).

I agree with kfennell that disc wear is unlikely to change thermal mass much (impact boiling).

What happens when you boil? Foot to floor and no brakes?

Last edited by thebuzzard; 11-06-2018 at 09:30 AM. Reason: typo
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post #15 of 15 (permalink) Old 11-07-2018, 09:17 AM
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Our two-piece ULTRAdiscs deliver 10lbs of unsprung weight savings. We run a larger rear hat resulting in less iron in the ring - this delivers 3lb savings per rear rotor. I'm not aware of anyone else who offers this innovation so I would be skeptical about claims of 11+lb savings.

We will be offering a sale on our rotors soon - but they won't be as cheap as some of the prices listed above. We have 100s of people running and clients are getting extremely long life out of them - especially with Carbotechs, G-loc, Pagid, etc pads. I would steer clear of CL if you are looking for longer life.

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