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-   -   Tarmac 88 "Button" GLTC/ST5/TT5 (https://www.miataturbo.net/build-threads-57/tarmac-88-button-gltc-st5-tt5-90770/)

Brap-Brap 09-08-2019 01:21 PM

When I talked to you at Mid-O you mentioned she cut-out and wouldn't re-fire. You figure out the issues yet?

While the K motor itself is wonderfully reliable and makes easy power, K Miatas products are not the highest quality in my experience. Justin Lee has a K Miata trans kit in the WRL V6 car and at Mid-O last October we were fighting issues with driveline vibration and sloppy driveshaft joints that ate 3 output shaft seals and stripped out the adapter piece. Not to mention the numerous issues Greg Peters has had on his car.

sixshooter 09-09-2019 06:20 AM

I have a K-Miata BMW trans kit and have no problems with the custom driveshaft. It was made by a driveshaft shop and isn't something made in house by them according to the packaging.

Sometimes outside suppliers get it wrong, so taking it to a local driveshaft shop to have the balance and components checked would have been on my list after first indication of trouble. Even brand new u-joints can fail.

I had good responses out of them for every question I had.

doward 12-16-2019 10:22 AM

2020 NASA ST rules are official, and the submission calculator is updated/live.
https://www.nasaproracing.com/rules
https://community.drivenasa.com/topi...ions-proposed/



Toyo RR is added to the 100tw category and therefore gets a +.5 credit and is available in 245/40/15. That becomes pretty attractive.

I am considering 225/45 RR on 9" for less contested events/practice setup as it "pays for" my splitter(-.5). That lets me run at 150/2265 with splitter/wing at my current power.
Using 205 R7 on an 8" requires me to add 75lbs(at 150avg whp)




doward 12-23-2019 02:25 PM

I’ve been wanting to confirm this combination for a while now, and finally had all the parts on hand at one time.

11.75” Trackspeed “Mega” BBK. (Wilwood Superlite, 7420 pad)
15x9.5” +29 Konig Freeform
no spacer needed, plenty of room.


https://cimg9.ibsrv.net/gimg/www.mia...3fcebab78.jpeg
https://cimg0.ibsrv.net/gimg/www.mia...b442a4bd6.jpeg
https://cimg3.ibsrv.net/gimg/www.mia...0f2838bfa.jpeg
https://cimg1.ibsrv.net/gimg/www.mia...cbb782787.jpeg


Consumable cost economy almost makes sense as a single set of front pads might last a whole ST5 sprint racing season.

AutoFreak57 12-23-2019 07:11 PM


Originally Posted by doward (Post 1557927)
I’ve been wanting to confirm this combination for a while now, and finally had all the parts on hand at one time.

11.75” Trackspeed “Mega” BBK. (Wilwood Superlite, 7420 pad)
15x9.5” +29 Konig Freeform
no spacer needed, plenty of room.



Consumable cost economy almost makes sense as a single set of front pads might last a whole ST5 sprint racing season.

Good to know those fit. I was wondering. Supposedly the 9" dekagram fits too. Opens up the wheel options for sure.

doward 01-20-2020 02:29 PM

https://cimg4.ibsrv.net/gimg/www.mia...1c0439cb2.jpeg
https://cimg5.ibsrv.net/gimg/www.mia...a91c00a0a.jpeg
https://cimg9.ibsrv.net/gimg/www.mia...7211ff676.jpeg
https://cimg1.ibsrv.net/gimg/www.mia...11a542238.jpeg

I took a few months off Miata-ing from NASA Champs until after New Years. Felt good to disconnect from this car for a while, and I feel recharged for 2020 efforts.

Keegan Engineering is going to help get the engine package up to GLTC power level. So I pulled the lump and it’s leaving today.

I’m still focusing primarily on NASA ST5/TT5 for 2020, but will be making a couple mods that take penalties in that ruleset so the car is better for GLTC and just fun local HPDE stuff with friends.

Unless the stars align, I won’t be making the tow to Utah, so Miata Reunion is probably my farthest travel plan.

2020 Goals:
-Sub 1:37 Mid Ohio Club Course N/A BP
-Drive VIR again
-Drive Road Atlanta for the first time.
-Sweet new Tarmac 88 livery.

turbofan 01-20-2020 02:37 PM


Originally Posted by doward (Post 1560093)
-Sweet new Tarmac 88 livery.

IN.

mx5-kiwi 01-20-2020 02:37 PM


Originally Posted by Brap-Brap (Post 1548209)
When I talked to you at Mid-O you mentioned she cut-out and wouldn't re-fire. You figure out the issues yet?

While the K motor itself is wonderfully reliable and makes easy power, K Miatas products are not the highest quality in my experience. Justin Lee has a K Miata trans kit in the WRL V6 car and at Mid-O last October we were fighting issues with driveline vibration and sloppy driveshaft joints that ate 3 output shaft seals and stripped out the adapter piece. Not to mention the numerous issues Greg Peters has had on his car.


Presuambly you are aware they had a problem in the first batch or so with one of the pieces in the kit?

I had unreal (read frghtening) vibration and got sent a replacement part. Between that and a drive shaft balance it has mostly gone away now.

I too found them incredibly helpfull and very keen to work through any issues. Coudln't recommend them enough.

Anyway, sorry to hijack.

Midtenn 01-20-2020 03:30 PM

What kind of power are you aiming for in GLTC trim? I know most of the Miatas are running (or swaping to) K24's. A few dumb people (Cody and I) are sticking to low boost BP's.

cabowabo 01-20-2020 04:00 PM


Originally Posted by Midtenn (Post 1560103)
A few dumb people (Cody and I) are sticking to low boost BP's.

I've been thinking of going that route, too, so can appreciate the dumbs at work here.

doward 01-20-2020 05:23 PM


Originally Posted by Midtenn (Post 1560103)
What kind of power are you aiming for in GLTC trim? I know most of the Miatas are running (or swaping to) K24's. A few dumb people (Cody and I) are sticking to low boost BP's.

~165 peak is my target for ST5's 158 average power at 2450lbs.
I plan on running a splitter, and pulling all 250lbs of NASA ballast out, so it will be a very light(~2180) car on 205s, probably.


Scaxx 01-20-2020 05:54 PM

If it's that light, you may need to talk to @concealer404 about jounce testing it.

concealer404 01-20-2020 06:00 PM

I'm happy to avail myself and my services if you need some scientific testing. :)

doward 01-24-2020 11:39 AM


Originally Posted by turbofan (Post 1560094)
IN.

Soft tease.

https://cimg8.ibsrv.net/gimg/www.mia...f6082a6aa.jpeg
https://cimg7.ibsrv.net/gimg/www.mia...37ca2001e.jpeg
https://cimg0.ibsrv.net/gimg/www.mia...e1dbb1982.jpeg
https://cimg2.ibsrv.net/gimg/www.mia...7aa0994d6.jpeg

doward 01-24-2020 11:43 AM

I’m undecided on the headlights. I have satin black for them like the “rendering”, but covering them with the white/color gradient would also be cool.

I have to make a decision on the build plan concerning splitter vs airdam-only, before I wrap one of the airdams.

I’ve wrapped a few commercial vans/trucks in my past, but never worked with panels this large on such a curvy car before. So I’m learning a ton as I go.
The rear bumper and hardtop will likely get 3-4 pieces with seams. They’ll both have two colors, and each color with need two pieces.



Midtenn 01-24-2020 02:45 PM

Cool concept. Makes for entertaining discussions on what car you're driving:

https://images2.imgbox.com/56/98/eKeXJj2L_o.jpg

doward 01-24-2020 02:54 PM


Originally Posted by Midtenn (Post 1560491)
Cool concept. Makes for entertaining discussions on what car you're driving:


it’s only going to get more confusing. Lol

https://cimg4.ibsrv.net/gimg/www.mia...d5b1af104.jpeg

doward 01-24-2020 02:56 PM

Live tweet:

https://cimg7.ibsrv.net/gimg/www.mia...6f057df69.jpeg


Edit: this is where I’m leaving it for the weekend.

https://cimg2.ibsrv.net/gimg/www.mia...c737d9429.jpeg


P.S.
Keegan Engineering received my engine today.

Efini~FC3S 01-25-2020 10:49 AM

What are you doing differently with the engine build to hit the power target?

doward 01-25-2020 01:42 PM


Originally Posted by Efini~FC3S (Post 1560546)
What are you doing differently with the engine build to hit the power target?

Compression and cams.
Keegan has a custom cam grind he’s gonna throw in it, and a set of 84mm Wisecos instead of the OEM JDM 83.5mm.


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