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Brake disc specs?
- Thread starter Moge
- Start date
We're about to start installing everything but the shipping company lost my calipers, so we've been on hold for a couple of weeks. @titaniumdave I'd love to use your rotors and discs, but my budget had to be a bit conservative before we know everything that needs upgrading and fixing. The winter and salt are also extremely rough on the discs here in Norway, so I might use the less expensive option from Eliseparts this winter and then look into upgrading again. I'm also considering buying the AP 4 pot calipers for the front and moving the original front brakes to the rear if it turnes out that the other calipers are lost.
I've been in touch with Eliseparts.com again regarding the AP PRO 5000 4-pot calipers (Elise Parts - Braking Systems - Brake Calipers - AP PRO 5000 4 Pot Brake Calipers) and inquired if they would fit the Roadster. Geary at EliseParts has asked me:
Is your front upright EXACTLY the same as the one in the attached picture?
Is your front caliper EXACTLY the same as the one in the attached picture?
The bit that I need to know is:
Do the mount points on the steel upright protrude 6mm further OR does the caliper have 6mm thicker mounting surfaces than the standard Lotus AP Caliper?
Otherwise how does a 300mm brake disc fit?
Does anyone have the answers to this?
Is your front upright EXACTLY the same as the one in the attached picture?
Is your front caliper EXACTLY the same as the one in the attached picture?
The bit that I need to know is:
Do the mount points on the steel upright protrude 6mm further OR does the caliper have 6mm thicker mounting surfaces than the standard Lotus AP Caliper?
Otherwise how does a 300mm brake disc fit?
Does anyone have the answers to this?
What’s your reference point for measuring? Couldn’t you simply measure what you have and compare to the new ones. If your simply moving the caliper 6mm out then a 6mm plate. Would suffice surely.
If you need standard measurements I can whip a wheel off but I don’t know what your datum points are
If you need standard measurements I can whip a wheel off but I don’t know what your datum points are
I thought I already answered this.
Here are the pics. Please don't ask me to tell you which is which.
Here are the pics. Please don't ask me to tell you which is which.
First of all thanks @MLAUTO! I also had an old upright laying around, so I got all of it sent of to Eliseparts. They are working on a full 4 pot kit that should be ready beginning of December. The kit will be adapter mounts and 4 pot brake calipers, 2 piece discs, hoses and brake pads.
I will anyhow start assembling my 2 sets of OEM 2-pots on all 4 wheels next week (having had 2 calipers lost in the mail for more than 4 weeks).
I will anyhow start assembling my 2 sets of OEM 2-pots on all 4 wheels next week (having had 2 calipers lost in the mail for more than 4 weeks).
Attachments
Why all 4 other than for looks, why not just the rear. You really want the fronts to be over effective?
I've already order the kit to mount the OEM front 2-pots in the rear (and keep the original rear caliper for the handbrake) with 308mm brake discs and 4mm spacers. I got hold of an extra set of OEM calipers to use on the rear wheels. Eliseparts would not recommend the same front and rear calipers as they need to have more bias at the front than the rear as the weight transfers to the front under braking.
On an elise yes, but the sheer amount of additional weight on the rear of a roadster is going to take a while to upset that balance.Its close to double the weight and nearly all of that is on the rear axle
The car is finally jacked up and ready to undergo the full brake, dampener and caliper refurb.
The uprights and wish bones had quite a lot of surface rust, but the overall state is pretty good. While having the brake discs and calipers disassembled we changed the wheel bearing on the front left wheel. I bought a salvage part from a 2011 Sport only having 30.000km on the clock. Here with the old wheel bearing
The mounts for the oil reservoir should arrive next week.
Most of the parts from Eliseparts.com have arrived and the rear radial caliper mounts looks like they'll fit with a little modification. They hit the ABS sensor wire bracket and the lower ball joint.
I've decided to go for 4 pot front calipers, the OEM 2 pot calipers on the rear wheel and keep the OEM rear brake as handbrake. The new OEM calipers have been shipped to Brake Caliper Refurbs in the UK to get a full overhaul (Brake Caliper Refurbs – caliper painting specialists – Specailist brake caliper refurbishment, caliper painting, big brake kits) along with the 4 pot calipers from Eliseparts to get a fresh coat of matching paint.
The uprights and wish bones had quite a lot of surface rust, but the overall state is pretty good. While having the brake discs and calipers disassembled we changed the wheel bearing on the front left wheel. I bought a salvage part from a 2011 Sport only having 30.000km on the clock. Here with the old wheel bearing
The mounts for the oil reservoir should arrive next week.
Most of the parts from Eliseparts.com have arrived and the rear radial caliper mounts looks like they'll fit with a little modification. They hit the ABS sensor wire bracket and the lower ball joint.
I've decided to go for 4 pot front calipers, the OEM 2 pot calipers on the rear wheel and keep the OEM rear brake as handbrake. The new OEM calipers have been shipped to Brake Caliper Refurbs in the UK to get a full overhaul (Brake Caliper Refurbs – caliper painting specialists – Specailist brake caliper refurbishment, caliper painting, big brake kits) along with the 4 pot calipers from Eliseparts to get a fresh coat of matching paint.
dhrivnak
Active Member
Hi All,
I'm just reading this and getting up to speed. I too would like to improve my breaking, but budget is somewhat limited. A few things that I had questions about...
- It was said that the Roadster weighs 1000# more than the Elise and has significantly more weight on the rear "axle". Per my R&T testing of the Roadster said that it was 700# more , but amazingly, the weight distribution only changed from 38%/62% to 35%/65%.
- It was said that the OEM rear setup wears 3x faster than the fronts and proves how undersized they are. I agree with the OP that this does not prove that they are undersized, but they are overly biased.
- I believe rear weight biased cars still mostly benefit from better front brakes. The weight transfer during braking is significant. Not scientific, but just look at 911s with their larger calipers on the front, and they have an even greater weight bias on the back being a rear engined car. And, 911s are generally some of the best braking cars around. I think the OEM front setup was limited to the 16" wheel as well as running 175 section tires. I have put OEM rear wheels (17") on the fronts and running 205s. So, anyone know of any larger rotors than the 310 rears or 308 from EBC? Maybe EBC makes something even larger. I agree the larger the diameter, the more brake torque that can be applied.
Moge, please lmk how your setup went.
Thanks,
Henry
I'm just reading this and getting up to speed. I too would like to improve my breaking, but budget is somewhat limited. A few things that I had questions about...
- It was said that the Roadster weighs 1000# more than the Elise and has significantly more weight on the rear "axle". Per my R&T testing of the Roadster said that it was 700# more , but amazingly, the weight distribution only changed from 38%/62% to 35%/65%.
- It was said that the OEM rear setup wears 3x faster than the fronts and proves how undersized they are. I agree with the OP that this does not prove that they are undersized, but they are overly biased.
- I believe rear weight biased cars still mostly benefit from better front brakes. The weight transfer during braking is significant. Not scientific, but just look at 911s with their larger calipers on the front, and they have an even greater weight bias on the back being a rear engined car. And, 911s are generally some of the best braking cars around. I think the OEM front setup was limited to the 16" wheel as well as running 175 section tires. I have put OEM rear wheels (17") on the fronts and running 205s. So, anyone know of any larger rotors than the 310 rears or 308 from EBC? Maybe EBC makes something even larger. I agree the larger the diameter, the more brake torque that can be applied.
Moge, please lmk how your setup went.
Thanks,
Henry
Hi Henry,
The upgrade has been amazing and the braking power is at completely new level. The 308 discs and YellowStuff gives you an immediate upgrade and better performance/feel. The full rebuild did take some effort (mostly the rear conversion was time consuming). Changing to the 4 pot calipers and changing the cables is farily easy.
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