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Old 11-05-2019, 11:54 AM   #4901
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What are the opinions on the best track rotors for 17" wheels
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Old 11-05-2019, 12:07 PM   #4902
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What are the opinions on the best track rotors for 17" wheels
Any blank face high carbon rotor will be perfectly fine. Centric/StopTech offer such a rotor for relatively short money.

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Old 11-05-2019, 12:13 PM   #4903
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Any blank face high carbon rotor will be perfectly fine. Centric/StopTech offer such a rotor for relatively short money.
This.
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Old 11-05-2019, 01:18 PM   #4904
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Any blank face high carbon rotor will be perfectly fine. Centric/StopTech offer such a rotor for relatively short money.
OK good to know. My fronts just get so damn hot on track days. Smoking if I dont do some cool down time
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Old 11-05-2019, 01:26 PM   #4905
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OK good to know. My fronts just get so damn hot on track days. Smoking if I dont do some cool down time
What pads do you run? Also, what fluid?

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Old 11-05-2019, 01:59 PM   #4906
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OK good to know. My fronts just get so damn hot on track days. Smoking if I dont do some cool down time
Your rotors are not the issue, it's the cooling. I went through the same thing, boiled the fluid several times while trying different pads and fluid. I solved the problem by adding cooling ducts, after that I had zero issues. Ideally, you want a BBK if you track heavily. I have one now and can push the car with no worries. Expensive, but rather pay up that have issues at top speed.

Other people don't think it's necessary, to each their own.

EDIT: my point is, stock rotors are fine as long as they're cooled properly. If you find a deal on Stoptech rotors then go for those, sometimes they're as cheap or cheaper than stock. If you've had issues so far, I'd replace the rotors when you add cooling.
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Old 11-05-2019, 02:04 PM   #4907
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Your rotors are not the issue, it's the cooling. I went through the same thing, boiled the fluid several times while trying different pads and fluid. I solved the problem by adding cooling ducts, after that I had zero issues. Ideally, you want a BBK if you track heavily. I have one now and can push the car with no worries. Expensive, but rather pay up that have issues at top speed.

Other people don't think it's necessary, to each their own.
^Same. Verus brake cooling kit solved my issues before I went BBK
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Old 11-05-2019, 02:18 PM   #4908
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Your rotors are not the issue, it's the cooling. I went through the same thing, boiled the fluid several times while trying different pads and fluid. I solved the problem by adding cooling ducts, after that I had zero issues. Ideally, you want a BBK if you track heavily. I have one now and can push the car with no worries. Expensive, but rather pay up that have issues at top speed.

Other people don't think it's necessary, to each their own.

EDIT: my point is, stock rotors are fine as long as they're cooled properly. If you find a deal on Stoptech rotors then go for those, sometimes they're as cheap or cheaper than stock. If you've had issues so far, I'd replace the rotors when you add cooling.
I think this is very dependent on the track(s) that are being driven as well. I don't run brake cooling ducts at all and haven't overheated the brakes. With that being said, I do have the PP Brembo's, so that likely helps with better thermal capacity than the stock brakes.

The Verus kit is great though and not very expensive.
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Old 11-05-2019, 02:19 PM   #4909
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Yes looking at ducting. Using hi Temp Motul fluid an good pads no fade just a lot of heat
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Old 11-05-2019, 03:16 PM   #4910
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I was going to try not to get too nerdy about this. However, I have been messing with a program called Optimum Lap. It takes the specifications of your car (including tire size) and spits out your theoretical fastest lap time. So far I have found it very close with my team mates spec miatas. I am entering my cars information in the program tonight.

I guess my question should have been. Has anyone with a track prepped/track car done this and care to share their outcome?

FYI before the FT86 Speedfactory time attack car went widebody they ran the 18" setup.
I havent mess with 17" vs 18" on wheel size, but I have tried 235/40, 235/45, 245/40, 245/45 and 255/40 tires on 17x9 wheels. My car has mid to heavy aero (enough to cap top speeds at around 115mph and get 1.5G and higher loads on 200TW tires). With NA power, 235/45 was the fastest everywhere. While I believe that in some tracks gearing played a big factor, I think it depends on a lot more than just "width vs grip vs weight".

For example, 235/40 and 235/45 have the same width, and 235/40 has actually a wider thread width but cornering speeds were a tiny bit higher on 235/45 tires. My suspension is quite stiff and I think the extra sidewall was helping soften things down enough. But then again, by the same logic, 245/45 should've been faster, but it wasnt. Cornering speed was about the same as 235/40.

So what im trying to say is, YMMV. Try it and see for yourself what works best, but dont expect numbers pulled from somebody else on some shody test to be of any kind of accuracy or you may be setting yourself in for dissapointment. Personnaly, I like that 17" tires are cheaper and I want to try 17x10 wheels with the 255/40 tires again, I believe this will be my winning setup but Im pulling this one out of my ass, its just me guessing shit from what I have previously tried.
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Old 11-05-2019, 04:41 PM   #4911
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I havent mess with 17" vs 18" on wheel size, but I have tried 235/40, 235/45, 245/40, 245/45 and 255/40 tires on 17x9 wheels.
Now this this the type of discussion I was hoping to open up.

Did you record speed via GPS or Wheel speed?

255/40/17 are a lot cheaper than 265/35/18 so I would like to keep using them but the question has me curious.

The 17x10 idea is interesting too.
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Old 11-05-2019, 04:43 PM   #4912
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I think this is very dependent on the track(s) that are being driven as well. I don't run brake cooling ducts at all and haven't overheated the brakes. With that being said, I do have the PP Brembo's, so that likely helps with better thermal capacity than the stock brakes.

The Verus kit is great though and not very expensive.
True, it depends on the track but it also depends heavily on the driver. To be fair, I have evolved as a driver and use my brakes better now than I did 3 - 4 years ago. Most likely I was using my brakes too much when I first got the car.

The last time I boiled the fluid was at Sebring 3 years ago, top speed was 120 but I was over 100 in several areas. That was DTC-60 pads and Motul 660 fluid.

This year I went to Daytona with 2 heavy baking zones back to back, 125 MPH and 140 MPH. DTC-60 pads, Motul 660 AND Verus cooling ducts, no issues.
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Old 11-05-2019, 04:54 PM   #4913
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Now this this the type of discussion I was hoping to open up.

Did you record speed via GPS or Wheel speed?

255/40/17 are a lot cheaper than 265/35/18 so I would like to keep using them but the question has me curious.

The 17x10 idea is interesting too.
I've had lower lap times on a 235/45/17 vs a 245/40/17 on 17x9 wheels, same track (PBIR) 2 months apart. My laptop crashed and I lost all my data so I can't help you there.

A proper analysis to determine if a 10mm wider tire will significantly lower lap times is doable but complex and requires lots of data management and reference points. You also have to optimize tire temps and alignment to truly know the benefit of the extra width. I'd be a fun experiment if you can afford it.
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Old 11-05-2019, 04:57 PM   #4914
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Verus cooling ducts, no issues.
Did you have to eliminate the windshield washer reservoir with that kit?
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