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-   -   Track prepped Rotrex Supercharged Miata (https://www.miataturbo.net/race-prep-75/track-prepped-rotrex-supercharged-miata-47756/)

k24madness 09-20-2017 03:12 PM

Thanks Flyer.....I fixed both video links.

ThePass 09-20-2017 03:31 PM

Car is faaaaast

How are the brakes?

k24madness 09-20-2017 03:55 PM


Originally Posted by ThePass (Post 1440803)
Car is faaaaast

How are the brakes?

Stoptech V8r brakes are great! Need to change rear compound to something with less bite. Got some XR4's on the way.

With the 1" master and sport booster they are still a bit touchy for good heel toe blipping. Ideally I would convert to dual manual masters but that's not in the cards right now. As silly as it sounds I am gonna try adding a couple of big springs to give more pedal pressure. Pretty primal but I bet it will help.

mx5-kiwi 09-20-2017 05:52 PM

I have no issue with standard '89' 1600 master cylinder and the 11.75" fronts with Goodwin (old) v3 rear (same size as sport I believe)..Carbotech/G-lok pads.

In fact I am scared to make any changes because they are that perfect..... but then I like a 15 and 16 mm rear sway bar too....must just be me.

k24madness 09-20-2017 06:36 PM

Both my front and rear calipers have larger piston volumes than what you're running. It's not a great comparison.

I am serious about rigging up some springs to add pedal pressure. Kinda getto but should help with the problem till I can give it more attention.

Moving onto important things....Working on gear ratios for the new sequential. Plan to pull the trigger this week.

Savington 09-20-2017 06:44 PM


Originally Posted by k24madness (Post 1440608)
I don't have frame rails. It's not allowed in my class.

7.3.2.a.1, right? Greg confirmed? I have a set for Rover, pulled them for PTE years ago but was considering adding them back mostly for ballast.

k24madness 09-20-2017 07:39 PM


Originally Posted by Savington (Post 1440844)
7.3.2.a.1, right? Greg confirmed? I have a set for Rover, pulled them for PTE years ago but was considering adding them back mostly for ballast.

Yup that's the one. I even asked Greg for an exception so I can repair my caved in ones. I also explained they were nothing more than floor supports. He was not having any of it. Said they would assess points for the "mod" if I altered them from the originals.

I can forward you the email exchange if you like.

k24madness 09-22-2017 12:38 PM


Originally Posted by flier129 (Post 1440702)
Could this be a ST2 car or is there a component I'm missing that puts it into STU? If it can, I think it could be really competitive, at least in TT2.

Sorry late reply....somehow missed your post.

It's classed as SU just to make things easier as we shake out the car. I crunched the numbers and it will fit in ST2 pretty easy with some tweaks. That class is not that great in my region though. ST3-ST4 is where you want to be for good racing. ST3 looks very doable. ST4 will be tough with the non OEM roofline and pending sequential.

I need to optimize the saline interface over the next few events. That's really what's holding things back at the moment. The extra power and grip helps overcome some of that to make racing more exciting.

k24madness 02-04-2019 02:23 PM

The time has come to part with my Miata. It's been a long fun road ending with much less usage than I expected. When I started building the ultimate track Miata I was driving 10+ times a year. Lately it's once or twice, I just don't see that changing in the future. The car is soooooo well sorted! It just needs to be driven more!
Most of the build history can be found here in this thread. $25k Tom 415-515-9018

Quick refresher:
300WHP 1950lbs Dry Weight
Autokonextion Widebody kit
Autokonextion Carbon fiber fastback roof,
Carbon Fiber hood Hood
TC Design Chrome Moly Cage,
Low hours Rebello Engine, Ported head, SUB, Custom Cams, Supertech Heavy Double Valve Springs,Supertech pistons with Forged rods, Boundry pump (full)Skunk 2 intake. Rotrex C30-74 Super Charger. True 300WHP (E85)
MS Labs MS3 BasicID1300 CC stainless injectors.
6 Speed Trans with TDR Shifter
AST Double Adjustable Shocks 1000/550 Springs,
Ron Davis Radiator with oil cooler.
Racing Beat 1.25" Hollow bar with custom supports
OS Gixen Diff 4:10 gears,
Aim Pista Dash
2 sets 15x10 wheels with 245/580/15 Tires
Stoptech STR42 with 11.75" rotor front
Miata Sport Rear with 10.90" rotors
1" 929 Master cylinder, NB Front Subframe, (improved geometry)
Spherical control arm bushings on lower arms and rear upper knuckles,
Delrin control arm bushings on upper arms.
Fuel Cell etc

Tim doing a 1:41.5 at Sonoma (Lap 3)

Beluci 02-06-2019 12:51 PM


Originally Posted by k24madness (Post 797637)
That is high on the list of changes desired. It's still running stock brakes so that needs to be addressed first.

Can you remember how well stock brakes work on that car? Im building my Rotrex right now and wondering whether it is worth to start with stock brakes w race pads.

Btw, what a shame that you sell it. Congrats to the new owner.

emilio700 02-06-2019 04:09 PM

GLWS Tom. As near as I can tell, that car is one of the few very well sorted and really fast Rotrex BP powered track cars on the planet. New owner will love it.

18psi 02-07-2019 02:19 AM

Great seller selling a proper race car

k24madness 02-12-2019 07:03 PM

Thanks Guys!

sonofthehill 02-13-2019 11:55 AM

This is an a amazing race car! I had the fortune of seeing it in person a few times. No expense was spared.

Tom is a good honest person. Is this still available?

k24madness 02-14-2019 12:08 AM

Thanks Carlos!

The car car is still for sale. I am working on a proper for sale ad once I get some updated pics.

k24madness 02-20-2019 04:17 PM

I posted it in the classified today. https://www.miataturbo.net/cars-sale...4/#post1523821

While taking photos I could not help but appreciate how well this body kit keeps air off of the tires.

https://cimg9.ibsrv.net/gimg/www.mia...11a3d2f6d8.jpg
https://cimg1.ibsrv.net/gimg/www.mia...230841ebfe.jpg

The bumper extends the area of downforce from the splitter with all that flat surface area
https://cimg0.ibsrv.net/gimg/www.mia...ca92dfc6c7.jpg


The integrated duck tail, Smooth tapered back window and extended wing mounts all combine for great rear downforce with reasonable drag.
https://cimg1.ibsrv.net/gimg/www.mia...7aad592fb6.jpg

mx5-kiwi 02-20-2019 05:03 PM

I have said it before (maybe even in this thread) but I love this car.

It rips me that Autokonection (sp?) couldn't stay in business with this kit. I ordered it so many times and each time bailed feeling the time lines (or something) weren't right with his payment versus orders etc. Sadly for a friend of ours who paid and never recieved.

BUT youare so right, it is a lovely kit when fitted properly like yours.

Midtenn 02-22-2019 09:50 AM


Originally Posted by mx5-kiwi (Post 1523863)
I have said it before (maybe even in this thread) but I love this car.

It rips me that Autokonection (sp?) couldn't stay in business with this kit. I ordered it so many times and each time bailed feeling the time lines (or something) weren't right with his payment versus orders etc. Sadly for a friend of ours who paid and never recieved.

BUT youare so right, it is a lovely kit when fitted properly like yours.

Good thing CCP and Lightyear are now offering fastback options and are fulfilling orders.

k24madness 02-22-2019 10:26 AM


Originally Posted by Midtenn (Post 1524098)
Good thing CCP and Lightyear are now offering fastback options and are fulfilling orders.

That's only one piece of the puzzle that makes this car work.

k24madness 03-12-2019 09:23 PM

TTT


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