GR86 Ready to Race - German GR86 Tracktool

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Danger.Speed

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Hello,

i already introduced myself in another thread. I'm official racetrack-addicted.
Already built a Mazda MX-5 Tracktool by myself: without interior, full rollcage welded by myself, Endless N39S brake pads, Nankang AR-1@Enkei 15 inch, oehlins coilovers...Then i decided to sale it and buy a GR86. Why? I love cars with great n.a. motor. I like turbo's aswell, but the feeling driving a n.a. is just different.
The whole car convinced me.
So in the following months or years I'll modify it even further then the mazda. I already started! :

-KW clubsport coilvers
-235/40/17 Nankang AR-1 with ProTrackOne 9x17"
-brake cooling kit
-Endless N39S pads

Next steps:

-loosing the interior
-more rear downforce (wing!)

Most of the parts i mount are constructed by myself, cause I'm a mechanical engineer who loves to think about cfd and fem analysis and to create my own parts that fit like a glove. Haha :D


I've also been on the racetrack in the last few weeks:

52870063604_8a72c02fb0_c.webp

52844642781_269b4f6c68_c.webp



I hope there are also some more ractrack-drivers among us. Would be nice to talk about some technical/performance stuff.

First post ended. 😄

Have a nice weekend!
Denis
 
@Onehp Ideal width of the rim should be 8.5" according to the table at their website. But i found this paper, where they claimed even better compatibility: 8 to 9.5. I wonder myself, because 235/45/17 is mentioned with a rim-width of 7.5 to 9. Which is less then the 235/40/17. (+ the 235/45/17 side-walls should be more flexible due the bigger diameter) But i think that has been carefully considered by Nankang.
But the combination works great. Maybe I'll try other tires too in the future.

nankang_ar1_bestatigung_felgenbreiten.jpg
 
I've seen this before, lower profile for some reason, sometimes, fits better on lower profile, doesn't make sense to me either, perhaps difference in construction? I though 235/45 was on limit of stretch on my 9", but maybe 235/40 works even better? Will ask tyre guy.
 
Last edited:
Hi,

I have my GR86 setup for weekend road car and occasional track car use. I have HKS Hipermax S with 5kg springs in front and 6.5kg in rear. I have the new Bridgestone Potenza Race in 225/40/R18 size on 9” wheels. For braking I have Ferodo DS1.11 pads and Motul 660 fluid, works great but am going to add Porsche brake ducts to improve brake cooling.
Alignment is approx -2.5 deg camber front and 0 toe, but will probably increase negative camber a bit to maybe -3 deg. Rear I have approx -2 deg camber and 5 deg sec toe in on each wheel.

I have had a Miata ND and Porsche 718 Spyder before that I drove quite a bit on track and the GR86 feels great so far. Besides camber and brake cooling I will add a bucket seat next.
CFEA2F82-15F6-47AD-90C8-96A2EC05000B.jpeg
463BF0D3-736D-4E2C-84DC-E06979A66759.webp
D21B6102-A399-4B0E-90BA-203E59F4F6E3.webp
 
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Danger.Speed said:
@Onehp Ideal width of the rim should be 8.5" according to the table at their website. But i found this paper, where they claimed even better compatibility: 8 to 9.5. I wonder myself, because 235/45/17 is mentioned with a rim-width of 7.5 to 9. Which is less then the 235/40/17. (+ the 235/45/17 side-walls should be more flexible due the bigger diameter) But i think that has been carefully considered by Nankang.
But the combination works great. Maybe I'll try other tires too in the future.

View attachment 16808
Click to expand...
That is just what they recommend to be in line with consumer guidelines but for track use you want a wider rim, see https://m.tirerack.com/tires/tests/...4944&cjevent=ad122c63d25111ed825fd2b60a18b8fa
 
Danger.Speed said:
Hello,

i already introduced myself in another thread. I'm official racetrack-addicted.
Already built a Mazda MX-5 Tracktool by myself: without interior, full rollcage welded by myself, Endless N39S brake pads, Nankang AR-1@Enkei 15 inch, oehlins coilovers...Then i decided to sale it and buy a GR86. Why? I love cars with great n.a. motor. I like turbo's aswell, but the feeling driving a n.a. is just different.
The whole car convinced me.
So in the following months or years I'll modify it even further then the mazda. I already started! :

-KW clubsport coilvers
-235/40/17 Nankang AR-1 with ProTrackOne 9x17"
-brake cooling kit
-Endless N39S pads

Next steps:

-loosing the interior
-more rear downforce (wing!)

Most of the parts i mount are constructed by myself, cause I'm a mechanical engineer who loves to think about cfd and fem analysis and to create my own parts that fit like a glove. Haha :D


I've also been on the racetrack in the last few weeks:

View attachment 16794
View attachment 16807


I hope there are also some more ractrack-drivers among us. Would be nice to talk about some technical/performance stuff.

First post ended. 😄

Have a nice weekend!
Denis
Click to expand...
Please tell us about your brake cooling kit :)
 
I have gone for 8x17 and 215/40/17 semi slicks. Weight wheels under 8kg.

With 235hp I like to have some movement in the car. 235, 245 or even 255 tire wide i think the grip is too much and throttle steering is out of the question.

I also want a lighter rotating mass in wheel tire setup. So it feels like you have more horse power.
 
AdvEvo said:
I also want a lighter rotating mass in wheel tire setup. So it feels like you have more horse power.
Click to expand...

True! - I went with the 235 AR-1 because they're are a great compromise between weight, width and grip. Nankang AR-1 are not that wide as other semislicks. I measured only 220mm tread width at a 8x17" Motec Ultralight at a friends car. Dunlop Direzza 03G for example are approx 245-255 wide in 235/45/17.
 
hsb said:
Please tell us about your brake cooling kit :)
Click to expand...

I tried to take some pictures yesterday :)

772601c5-99d9-4803-af28-2a74c8f4367a.webp


The air is routed directed through the wishbone. On the upper side a smaller outlet or nozzle will direct the air to the discs. I modified the anchor plates already, but I'll dismount them in future.
 
Danger.Speed said:
I tried to take some pictures yesterday :)

View attachment 16867

The air is routed directed through the wishbone. On the upper side a smaller outlet or nozzle will direct the air to the discs. I modified the anchor plates already, but I'll dismount them in future.
Click to expand...

Nice car + Mods. I also have a red one. I've heard that red cars come from the factory 0.5 /lap faster than any other colour :)

How do you find cooling + pads + fluid sufficient for track work? I was weighing up going this route vs going directly for a Megan III RS BBK.
 
Three4Eight said:
I also have a red one. I've heard that red cars come from the factory 0.5 /lap faster than any other colour :)
Click to expand...
True!! ;)
Three4Eight said:
How do you find cooling + pads + fluid sufficient for track work? I was weighing up going this route vs going directly for a Megan III RS BBK.
Click to expand...
A friend of me did this conversion at his GT86 and i was tempted to join the BBK club. But I don't like to upgrade everything to the maximum at the beginning. Improve your car in small steps and you will feel every step. In germany we say: "Don't shoot sparrows with cannons" :D

I'm very happy with the Endless N39S and the OEM discs with the cooling kit. Last week i ordered braided lines too, should improve the pedal feel again. I think we can be happy in general that it's a lightweight car. So the OEM brake will do his job great, if you don't plan to go the turbo-kit-route with 255/265 tires and a widebody kit.


hsb said:
Cool, looks like a 3d printed part? Would you consider sharing? My printables page: https://www.printables.com/@HenrikStenber_609602/models
Click to expand...
Yes it is indeed. Thanks for your openness. I really didn't want to discuss it, because these posts reflects my free-time, but a friend of me and me founded an engineering office two years ago. We're mainly doing industry-related business, but as a second source we opened a webshop, selling our constructed and well tested parts, so we unfortunately can't share the files...
I didn't want to advertise, so i didn't name our brand as you may mentioned :) If anybody want to know more, please contact me directly. I'll hand out some discount codes for sure.
 
Looks great 👍

Any rubbing with that wheel/tyre combo? I’m assuming yours are the ET38 offset?
 
Danger.Speed said:
Don't shoot sparrows with cannons
Click to expand...
Haha, well sorry to for the sparrows :), Its interesting to hear this combo works so well. My approch with the car is to invest in getting the car bullet proof for repeated laps before other mods - Brake capacity / cooling, oil cooler first. Then coilovers, wheels, tyres, etc later.
 
Three4Eight said:
Nice car + Mods. I also have a red one. I've heard that red cars come from the factory 0.5 /lap faster than any other colour :)

How do you find cooling + pads + fluid sufficient for track work? I was weighing up going this route vs going directly for a Megan III RS BBK.
Click to expand...
Who does the Megane 3 RS BBK for these cars? I had a search and couldn't find it.
 
I just bought megane 3 kit.

He makes the kitt with 330x28 mm discs and all brackets. Fits 17 inch wheels.

Godspeed

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www.godspeedbrakes.co.uk www.godspeedbrakes.co.uk
 
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