Miata Turbo Forum - Boost cars, acquire cats.

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-   -   My turbo MX-5 (https://www.miataturbo.net/build-threads-57/my-turbo-mx-5-a-65987/)

turbofan 01-28-2015 01:59 PM

Thanks for the info. I ordered them a week or so ago but it's good to hear confirmation of that, I won't be running tons of power (or likely hardly any power) for the time being.

You can always post more pics BTW :)

muoto 01-28-2015 02:03 PM

new pics are coming as soon as I start rebuilding my engine :)

muoto 02-20-2015 07:09 AM

engine rebuild has begun! some new pics

http://www.miata.fi/kuvat/2015-02-17-18.53.jpg

http://www.miata.fi/kuvat/2015-02-17-19.33.jpg

http://www.miata.fi/kuvat/2015-02-17-19.32.jpg

Pistons look clean. Remember this engine had run with E85

http://www.miata.fi/kuvat/2015-02-18-20.21.jpg

wait...wut?

http://www.miata.fi/kuvat/m2015-02-18-20.22.jpg

That explains all the noise :rofl:

My supermiata damper got loose, started to vibrate and looks like it crack the crank in half :fael: Am I first?

sixshooter 02-20-2015 07:36 AM

That's the first Miata crank I've seen broken through the #1 crank throw.

18psi 02-20-2015 08:57 AM

you're certainly in the first handful lol

that's some impressive carnage, congrats for making MAN torque

Ryan_G 02-20-2015 10:14 AM


Originally Posted by 18psi (Post 1207912)
you're certainly in the first handful lol

that's some impressive carnage, congrats for making MAN torque

Looks like less of a power related failure and more of an installation/part failure. Like he said, the damper slipping off and wobbling like crazy fucked thay crank up.

viperormiata 02-22-2015 01:35 PM

Don't think I've ever seen a crank failure, before.

muoto 02-23-2015 05:47 AM

1 Attachment(s)

Originally Posted by Ryan_G (Post 1207958)
Like he said, the damper slipping off and wobbling like crazy fucked thay crank up.

You're right sir.


https://www.miataturbo.net/attachmen...ine=1424711120
Also I just bought VVT head. I was thinking something like supertech springs & SUB’s. Make it “8000rpm proof”

timk 02-23-2015 06:52 AM

Super keen to see how you go with the VVT head.

Were the rods and pistons salvageable?

muoto 03-02-2015 02:37 AM

http://www.miata.fi/kuvat/2015-03-01-18.59.jpg
Supertech rods and pistons were OK

http://www.miata.fi/kuvat/s2015-03-01-18.58.jpg
http://www.miata.fi/kuvat/2a015-03-01-18.59.jpg

Only damage was that ~0.1mm notch in #1 main bearing cap. I don't think that matter


http://www.miata.fi/kuvat/bb2015-03-01-18.58.jpg

So;
-new crank
-new bearings
-new m-tuned oil pump
-ARP main bearing bolts. (maybe)

...and balance everything

muoto 03-20-2015 08:04 AM

2 Attachment(s)
Found an old crank back of my garage


http://www.miata.fi/kuvat/2015-03-08-14.52.jpg
It look OK apart from one journal which I have to polish and maybe use bigger bearing with that

Here's what I wish to achieve with the build VVT head:
https://www.miataturbo.net/attachmen...ine=1426853084

A much wider powerband. Make it spool ~300rpm quicker with the VVT cam. Lower midrange torque by retard timing from 21 to 18deg, this to make 6speed's last longer. And then as the torque start to decline just add boost to compensate and keep that flat torque line as long as possible with these stock cams.

mMMm....3500-8000rpm torque curve :drool:

Leafy 03-20-2015 08:08 AM

Dont retard that midrange timing, just run less boost there.

muoto 03-20-2015 08:17 AM


Originally Posted by Leafy (Post 1216899)
Dont retard that midrange timing, just run less boost there.

Wish it was that simple with internal WG :) Well I'll try port the turbine housing and see if I can get it work any better..or quicker I mean

hrk 03-20-2015 09:42 AM

ARP would be good insurance to keep the caps tight. New crank looks like it needs undersized bearings. Good luck.

muoto 03-20-2015 09:51 AM

2 Attachment(s)

Originally Posted by hrk (Post 1216931)
ARP would be good insurance to keep the caps tight. New crank looks like it needs undersized bearings. Good luck.

ARP main bolts ordered. Although I didn't have any problems with the stock ones


https://www.miataturbo.net/attachmen...ine=1426859469
Also there's M-Tuned billet oil pump waiting :party:

muoto 05-05-2015 12:23 PM

http://www.miata.fi/kuvat/2015-04-21-17.35.jpg
painted

http://www.miata.fi/kuvat/2015-05-05-18.54.59.jpg
I hope this will stop my oilpressure dropping while braking

timk 05-05-2015 09:30 PM

Cool DIY baffle, I hope it works!

m2cupcar 05-06-2015 11:05 AM

2 Attachment(s)
I'd go even further with the baffle- all the way around- like prod racers:
https://www.miataturbo.net/attachmen...ine=1430924708

muoto 05-07-2015 07:38 AM

I think about it but oil can escape in only direction there. Plus I haven’t notice any pressure drops on cornering, only when I braking:


sixshooter 05-07-2015 08:14 AM

Everyone has their tricks. I add one extra quart to the pan for track duty. I know the oil needs to drain by gravity out of the head and that most of the draining happens at the rear of the engine. I worry with high revving that it is pumping a lot of oil up to the top of the engine that doesn't have much time to get back down to the pan. I also like to think it reduces the propensity for the oil to heat up quickly because of the added volume.


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