Track forum general chit chat.

[Redd]

Originally Posted by dparm

I think I've said it here before, but it's hard to hit minimum thickness numbers IME. You will get dangerous heat cracks well before they get too thin.

From experience you can chew thru rotors if you have extremely abrasive pads mated to softer rotors (eg stock rotors). I've done it a few times over 1-2 trackdays with harsh pads like DS3000 and CCRg. Heat cracks are more a function of time - they are caused by the repeated heating and cooling of the rotors over many trackdays.

[bbnks2]

Originally Posted by omgzirra_exe

ive been testing the cheapo $50 rotors off rockauto on track days as a way to not waste my good rotors and i can tell ya with a set of track day pads from powerstop it's a pretty solid purchase to save your self some maintenance money. if you just wanna throw down some laps and not care about time.

i think the total comes out to less than $300 for front rotors and trackday pads. can last a few HPDE track days too. wouldn't use it for full on racing lol.

Just had a set of cheap rotors crack on me after a few autocrosses and 1 track day. Basically Brand new.. Ordered genuine m3 from fcp euro for the lifetime warranty... hope these don't crack too because it ended my day. The genuine ones are also aluminum hat so a few lbs lighter. Time to refit some brake ducts! They do wonders.

[tsk94]

Originally Posted by bbnks2

Just had a set of cheap rotors crack on me after a few autocrosses and 1 track day. Basically Brand new.. Ordered genuine m3 from fcp euro for the lifetime warranty... hope these don't crack too because it ended my day. The genuine ones are also aluminum hat so a few lbs lighter. Time to refit some brake ducts! They do wonders.

I had really good luck with OEM rotors with ducting. Had no cracking and lots of life left after ~25 days before I swapped them out for the PFC BBK.

FCP is the way to go for OEM replacements.

[rhyary]

I have front slotted Girodisk coming from Bimmerworks today. So I have a backup to the OEM. But, I don't want to replace the OEM prematurely. I want to make sure they are spent/used/done before replacing.

So, if the OEM don't crack, besides minimum thickness, when do you replace them?

I have brake ducts and while I can the get the OEM to fade, I can also get them to work and do a decent lap time.

I did alright at WGI and NYST with these. I have LRP coming and there I mostly brake once and the rest of the lap they brakes can cool off.

Because I don't have slicks on the front, I think the OEM work by the evidence that I can get to the ABS. Fading is another but related issue.

Trail braking is less effective compares to the CCM-R. After 1200 psi braking, the trailing is on a very hot disks and this is where I can see a difference, not in the initial stopping.

It is very interesting to me to experience this differences. two or three years a go I was on the OEM pads and OEM front disk and there was not stopping after the initial brake application. At NYST straight Between the 400 and the 100 the brakes were already fading. I did not have the brake ducts then.

Now with the Pagid RSL29 and OEM rotors I can say it is not that bad. I just did 1:37.3 at NYST and the laps before and after were quick as well.

I am pleased with this combination and I think others will be too and It is such a low cost to get started. I dare to say that if some one is starting on MPS4S then racing pads and OEM rotors will be fine. The only issue I see is high rate of consumption.

There are other reasons to get BBK or even CCM-R, but for someone that wants to start trackdays brake pads and good brake fluid seems to be a low cost to get started.

I am rambling, sorry…

[tsk94]

They can certainly still crack, I've just had good experiences with them not cracking on me. Other than cracks, you base when to replace off of min thickness.

[omgzirra_exe]

Originally Posted by bbnks2

Just had a set of cheap rotors crack on me after a few autocrosses and 1 track day. Basically Brand new.. Ordered genuine m3 from fcp euro for the lifetime warranty... hope these don't crack too because it ended my day. The genuine ones are also aluminum hat so a few lbs lighter. Time to refit some brake ducts! They do wonders.

yeah honestly even if you do crack a rotor at track its like $100 vs $1200 for a pair of rotors LOL so its just more track time for me.

luckily for me i haven't cracked the cheap rotor yet with aggressive pads. i just make sure i cool them off enough before coming to a stop.

honestly speaking it takes me less than 45 minutes to swap out the rotors so i do carry my oem ones just in case. or just carry more cheap rotors lmao.

[tsk94]

Originally Posted by omgzirra_exe

yeah honestly even if you do crack a rotor at track its like $100 vs $1200 for a pair of rotors LOL so its just more track time for me.

luckily for me i haven't cracked the cheap rotor yet with aggressive pads. i just make sure i cool them off enough before coming to a stop.

honestly speaking it takes me less than 45 minutes to swap out the rotors so i do carry my oem ones just in case. or just carry more cheap rotors lmao.

I think his point was it doesn't make sense to use cheap rotors when you can buy OEM rotors from FCP and replacement them for FREE when they wear out or crack. It's a cheaper approach in the long run, other then the up front cost, but you don't have to deal with shit rotors that way.

[Exclusivs]

Where are you guys ordering Do88 stuff? Direct?

Looking to add some PS coolers, maybe some others.

[omgzirra_exe]

Originally Posted by tsk94

I think his point was it doesn't make sense to use cheap rotors when you can buy OEM rotors from FCP and replacement them for FREE when they wear out or crack. It's a cheaper approach in the long run, other then the up front cost, but you don't have to deal with shit rotors that way.

i was responding with just my personal experience that's all.

FCP is great, my OEM rotors are from there. of course sometimes I don't want to spend the initial $1200 to get my warranty after sending in my old.

I've completed consistent laps with the cheap rotors which is why I've been testing them out vs my OEM ones. i can spend more money elsewhere like more track days/fuel.

thats just my reasoning behind it.

[omgzirra_exe]

Originally Posted by Exclusivs

Where are you guys ordering Do88 stuff? Direct?

Looking to add some PS coolers, maybe some others.

i think at one point EuroSport Tuning was a DO88 Dealer. not sure if they are still one. hard to find them in the US.

[Ximian]

Originally Posted by Exclusivs

Where are you guys ordering Do88 stuff? Direct?

Looking to add some PS coolers, maybe some others.

Leddy Motorsports. I ordered a few coolers from them around the Black Friday sales it just came straight from Sweden without the extra shipping costs do88 charges. Not sure why they can't do that all time

[rhyary]

Originally Posted by Exclusivs

Where are you guys ordering Do88 stuff? Direct?

Looking to add some PS coolers, maybe some others.

Autocouture had few kits in stock. Not sure if they sold all of them

[Davisca455]

Originally Posted by Exclusivs

Where are you guys ordering Do88 stuff? Direct?

Looking to add some PS coolers, maybe some others.

…another vote for Leddy.

[Exclusivs]

So, ended up ordering direct.

Saw leddy but didn't know their rep till a bunch of vouches here.

Thanks for input guys

[gmx]

Originally Posted by rhyary

haha, did the same to take hot psi and the it was smoking so much I jumped into the car and drove it in the paddock to cool it off.

Standard practice, that's what we do. Keep your gear on, stop asap where safe (like an unused pit bay by the entry of pitlane), grab your gauge, bleed them down then go do a lap of the paddock. Better yet, team up with someone in an alternate run group to do your pressures to get it done faster.

Had some PFC08 rears separate from the backing. Other pad pictured for comparison sake:


Anyone experienced this or know what could be the cause? Piston and guide pins look to operate fine. Surface rust is from driving it back home like that, in the wet and not doing anything about it for approximately a month. The rotor isn't scored but blue enough to be uncomfortable for reuse.

Already had DSUno on the front and now have them on the rear along with new OEM rotors. Love this pad even more, it's super easy to modulate.

[dparm]

What's wrong with the rotor being blue? That's actually a good sign you had heat in them. A perfectly-bedded rotor will be an even shade of blue across the entire annulus.

Pad material separating could be a manufacturing defect. I would call PFC. I've seen material flake a bit at the edges from very high heat.

[Senpai]

Woo! Installed my CP9660 this past weekend. Man, what a weight difference between these and the st-60s!

Also, had a buddy 3d print some inserts for the apr gt250 wing stands that makes them look like solid stands. Looks pretty neat!

[dparm]

Bruh, can we talk about those wheels?

[kayha12]

Originally Posted by Senpai

Woo! Installed my CP9660 this past weekend. Man, what a weight difference between these and the st-60s!

Also, had a buddy 3d print some inserts for the apr gt250 wing stands that makes them look like solid stands. Looks pretty neat!

Did you get a chance to measure it? BBK is definitely on the list for me as I think I'm pretty much maxing out the stock calipers. Torn between the Stoptech trophy or Essex AP Racing

[Senpai]

Originally Posted by dparm

Bruh, can we talk about those wheels?

Thanks! EC7s are my dedicated track set but these are the same size as those and same tires so I always have a backup incase anything happens

Originally Posted by kayha12

Did you get a chance to measure it? BBK is definitely on the list for me as I think I'm pretty much maxing out the stock calipers. Torn between the Stoptech trophy or Essex AP Racing

Unfortunately not, I had the non trophy though so it wouldn't have been a direct apples to apples comparison. I initially was going to go st-60 trophy as well but got a good deal on the cp9660 used so figured why not haha.

[derbo]

Originally Posted by dparm

Bruh, can we talk about those wheels?

TE37EVERYTHING

[omgzirra_exe]

Originally Posted by Senpai

Woo! Installed my CP9660 this past weekend. Man, what a weight difference between these and the st-60s!

Also, had a buddy 3d print some inserts for the apr gt250 wing stands that makes them look like solid stands. Looks pretty neat!

solid wing stands were the move.