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Discussion Starter #1 (Edited)
Hello guys,

I was testing these Rotora 2-pieces lightweight rotors for a little more than 2 weeks included one track day.

A little bit background of the testing car and driver:
I drive my car daily 60 miles in southern California traffics and I already done 23K mile in this car.
I have done a couple track days, a couple AutoXs and a several go cart track with this car.

These rotors are very decent upgrade from the OEM rotor.
The rotor is 350mmx28mm, slightly thicker than the OEM 350mmx25mm and I was able to fit in brand new brake pads without any problem.
The weight of these guys are 15.5lb. 32.6% weight reduction over the OEM rotor (23lb)

Pro:
- The car feel smoother off the feet in daily drive condition: When I depress the clutch, it start moving the wheel sooner than before. not a lot, but noticeable difference.
- Get back up to speed sooner in low RPM: When I am driving in low speed but high gear, it was a lot more willing to speed up comparing to stock rotors. Low RPM i am talking about 2K RPM when there supposed to have a slight turbo lag.
- MPG improvement: I see 0.5 to 1.0 miles per gallon improvement. MPG mainly improved during traffic, with a lot of start stop (supporting the first Pro point). Before: daily commute 23-24. After: daily commute 23.5-25. Fun fact, took out back seats and HWY only 30.4 MPG.
- Easier to maintain the speed during cruising: The RS decelerate when you are firmly hold you foot on gas petal when you are going 70-75, with the new rotors, it was a lot easier to hold the speed to maintain the gas consumption.
- Look super cool: Good looking is subjective, I don't know how their drilled one looks like, but these slotted one look very good.

Neutral:
- Braking power: Braking power didn't seem to changed with the OEM pads and Porterfield Street pads that i used on track.
- Noise level: OEM pad squeaking noise is gone BUT there is that rotors slots scraping the pads noise which is a lot less annoying than the squeaking noise.
- On Track: I don't feel any different. I went to my second track day ever with the upgrade rotors, so i couldn't tell if the rotor was help or i was just getting better.

Con:
- The slots seems very sharp- might wear pad faster: I am sure it will smoothed out when i use it more, but i i see brake dust inside the slot which makes me think the rotor is eating the pads faster.
- Not necessary a cheap upgrade: For the price, you can get tunes to achieve all the "Pros".
- No matching Rear: I don't think they have rear set yet because it doesn't save you that much weight.

Here are some pictures
IMG_5871.JPG IMG_5872.JPG IMG_5874.JPG IMG_5875.JPG IMG_5917.JPG IMG_5934.JPG IMG_5955.JPG IMG_5963.JPG IMG_5970.JPG

In conclusion:
It is a decent upgrade if you are looking to spend some money on rotors but not a bigger brake kit yet and it will give you some daily drive improvement with great looking rotors. I believe lighter rotors have some effects on tracking, but in high speed and my beginner skills, i feel the improvement could be very minimal.

Weight vertify picture

image1.JPG

Review update 1/25/2018
I have tracked the car with the rotors about 5 times now. It is holding up and not issue at all.
So far about 20 people purchased these rotors and i believe they can share their experience if they would like to.

Promote update (1/25/2018)
Rotora is about to end the group purchasing price of $581.75 for the slotted 2 piece rotors on February 1st.
After that it will be $795 for slotted discs and $895 for drilled discs
To order, you can send me your name and email and I contact them for you, or you can contact them directly @ [email protected]
 

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Pad wear will obviously suffer with slotted vs. blank rotors. I wouldn't expect much performance benefit other than unsprung weight reduction as you mentioned.

It's a pricey mod if all you are looking for is aesthetics


Sent from my iPhone using Tapatalk
 

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any consensus on the cooling aspect of the slotted rotors vs the blanks? I understand the concept of brake heat dissipation, but I'd like to see some test runs and actual data backing it up. I know I'm tired of my rotors being damn near on fire when I make hard runs and this would be a well spent upgrade if it legitimately provided better cooling.
 

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Nice honest review, thank you. I think I would go with driller rotors as they usually are chamfered at the holes so slightly better pad life. Less rotating mass is noticeable so when rotors need replace it's worth it a o spend a little more for a little less weight especially the RS being a little porky.
 

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Generally, slotted brake rotors do not improve the cooling of the rotor. The slots are there to allow the hot pad material that turns into a gas a way out from between the pad and rotor. if the gas stays between the rotor and pad, this allows the pad to float on the rotor, and less braking force results.
 

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Discussion Starter #9
Here is some more information on brake rotor on vents, drilled and slotted.

By the way i just notice when i rewatch this video, our OEM rotor vents are straight vents. The Rotora rotors are curve vents which help pump the heat out out the rotor according to the video below.

 

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Modern day pads don't really create lots of gas any more. Watch this video, it speaks to brake rotors and caliper technology. Benefits of drilled vs slots in discussed at the 6:10 mark:


And another video that talks about how modern days pads don't out-gas any longer:


Generally, slotted brake rotors do not improve the cooling of the rotor. The slots are there to allow the hot pad material that turns into a gas a way out from between the pad and rotor. if the gas stays between the rotor and pad, this allows the pad to float on the rotor, and less braking force results.
 

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Going from a 25.4mm to a 28mm along with those curved vanes will preform much better on the road course compared to those underfunded factory rotors.
 

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Those 28mm wider rotors and curved vanes will help quite a bit compared to the factory 25.4mm rotors. It's never a bad thing to lose weight either.
 

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Discussion Starter #15
I talked to Rotora for a matching set for rear.
They said they will make it but it will be late summer.
It will be same size, material, and weight as the OEM one but just with matching slots with the front.
So basically there won't be performance gain for the rear, but just look as cool as the front.
 

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is the OEM rotor also 350mm?

15.5lbs is amazingly light. I just bought some 2-piece DBA5000's in 350mm (evo x) and they weighed 22.4lbs
 

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is the OEM rotor also 350mm?

15.5lbs is amazingly light. I just bought some 2-piece DBA5000's in 350mm (evo x) and they weighed 22.4lbs
Yes, OEM is 350mm x 25mm. Really lacking in the thickness department. the Evo X should be 32mm or 34 mm thick I don't know for sure. Have you heard of anyone using these on EvoM? I don't ever remember seeing someone use their BBK kit before either.
 

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Yes, OEM is 350mm x 25mm. Really lacking in the thickness department. the Evo X should be 32mm or 34 mm thick I don't know for sure. Have you heard of anyone using these on EvoM? I don't ever remember seeing someone use their BBK kit before either.
ah yea that is narrow - evo x is 350x32
 
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