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Old 07-16-2015, 07:07 PM   #81
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Quote:
Originally Posted by ThePass View Post
Put together the spreadsheet where I'll be keeping a tab on the costs that go into this. Actual costs once they're incurred will be the important part, but I've also included other main items that I know will be needed with estimates for them:

ThePass' LFX Swap Budget
for the idiots (me) who can't/won't wrench. any idea on turn-key costs? or better to wait till you're 100% done.
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Old 07-16-2015, 07:09 PM   #82
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<p>Adding that cat to the bottom of all my financial spreadsheets&nbsp;from now on. Made me actually lol at work today.</p>

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Old 07-16-2015, 11:46 PM   #83
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Abacus Kitty is keeping an eye on the bottom line for us.


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Old 07-16-2015, 11:48 PM   #84
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Originally Posted by endura View Post
for the idiots (me) who can't/won't wrench. any idea on turn-key costs? or better to wait till you're 100% done.
Turn-key includes labor, so we won't know till' it's done. You could probably ring V8R and get an estimate though.

-Ryan
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Old 07-17-2015, 01:49 AM   #85
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I've been sucked into this escapade as well. Check out the MV7 transmission next to a 5 speed Miata. While they look about the same, the MV7 feels like it weighs 35lbs more (have not scaled them yet).

If I recall correctly, with the MV7 gear ratio mated to a Getrag 3.23, gear-limited top speed at 7200 rpm's is 210mph.
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Old 07-17-2015, 02:11 AM   #86
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Yeahhh that is why I went with the 3.42, and will still be on the look-out for a 3.72.
3.23 is for the salt flats
You were right when we spoke a couple weeks back though - the motor has the torque, so the longer gearing might make for a no-drama 3rd gear-only lap on tight tracks.. looking forward to experimenting.

My MV7 has been living the life of luxury on a pallet up till now. I'll put it on the shipping scale tomorrow.

-Ryan
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Old 07-17-2015, 02:48 AM   #87
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Quote:
Originally Posted by ThePass View Post
My MV7 has been living the life of luxury on a pallet up till now. I'll put it on the shipping scale tomorrow.
It has certainty gotten it's tan on thanks to CJ putting it outside every day.
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Old 07-17-2015, 10:19 AM   #88
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Quote:
Originally Posted by ThePass View Post
Yeahhh that is why I went with the 3.42, and will still be on the look-out for a 3.72... so the longer gearing might make for a no-drama 3rd gear-only lap on tight tracks.. looking forward to experimenting.
Top speed is still 168mph with a 3.9, and 80mph cruise is only 3400rpm. I'm really liking the looks of this swap with a stock mazda 3.9 diff and the 949 big-pawr-spec Giken that I already have sitting in the garage. According to the 3 different builds I've seen, I think I could do the whole swap for somewhere between $6k and $7k after deleting the Getrag diff stuff from the list and then selling my 99 engine, 6 speed, miataroadster shifter, lightweight clutch, and megasquirt. That's pretty damn tempting.
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Old 07-17-2015, 12:17 PM   #89
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The swap is doable while keeping the factory rear-end stuff?? I have a Giken too and a 3.9, soooo tell me more.
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Old 07-17-2015, 12:58 PM   #90
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It is do-able, sure (isn't everything). The PPF is normally removed for the swap, which the factory Miata differential relies on. To retain the diff you would need to address a new mounting solution, and get a custom driveshaft made.

-Ryan
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Old 07-17-2015, 02:15 PM   #91
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This thread is making me regret my turbo motor. 300whp that you can drive to the store or the track without years of mechanical drama and breakage? Fuuuuuuck.
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Old 07-17-2015, 02:19 PM   #92
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without years of mechanical drama and breakage?
<br />
<br /><br />
<br />That just wouldn't be fun though.
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Old 07-17-2015, 02:32 PM   #93
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Default Miata LFX Swap (Singular Motorsports &amp; Good-Win Racing)

Quote:
Originally Posted by aidandj View Post
<br />
<br /><br />
<br />That just wouldn't be fun though.
Yeah, we'd never learn anything about working on our cars that way.

Might as well buy a Porsche if you don't want to know how a car works.
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Old 07-17-2015, 02:41 PM   #94
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I was going to put my current motor/turbo/cooling system up for sale in the next week or so, but a local customer jumped all over it. I'm rather satisfied that it's staying local. Took me 4+ years, many many hours, and many revisions to get the turbo to run dead reliable at the track.

(old pic)




-Ryan
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Last edited by ThePass; 07-17-2015 at 07:37 PM.
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Old 07-17-2015, 02:54 PM   #95
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Sorry, off topic post.

Last edited by AlwaysBroken; 07-17-2015 at 04:33 PM.
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Old 07-17-2015, 03:50 PM   #96
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^ wut?
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Old 07-17-2015, 04:32 PM   #97
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Quote:
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^ wut?
He's...... Broken

Or completely off topic talking about 'his' car experience thus far.
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Old 07-18-2015, 12:19 AM   #98
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So it looks like there are lots of options for the Miata.

turbo
Rotrex
stroker
K24
SR20DET
Rotary
V8 (LS and Ford)
V6 Honda
V6 (GM) LFX
all others (add here)

I was looking for a new mill for the next Catfish, and it really is a difficult decision. However, the LFX seems to check all the boxes:

--can be installed to be as light or lighter than stock Miata block
--stock 290whp, 330whp with E85, 450whp turbo'd (WOW!)
--stock ECU, with tune, or with aftermarket options
--TORQUE. horsepower sells cars, TORQUE wins races (Carrol Shelby)
--relatively simple job, with all the required parts available from V8R
--mass centralization
--bulletproof, robust parts
--relatively cheap parts
--long gears


One of the surprises wtih the Catfish is that with some good horsepower pushing 1,700lbs, shorter gearing is the last thing you want. It always seems like first and second get you through the intersection only, so these new gear ratios should really help the car stretch its legs.

I'm REALLY excited to see how this build progresses.

Last edited by cordycord; 07-18-2015 at 01:11 AM.
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Old 07-18-2015, 04:17 PM   #99
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Quote:
Originally Posted by cordycord View Post
--bulletproof, robust parts
This is the one area that is still a bit of a ?? for me.

Has the LFX built-up a good track pedigree yet? I think most of the Camaros seeing the track have LS motors. Miata guys might be the first ones to really wring it out.

OTOH, so understressed in a Miata application -- so . . . .
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Old 07-18-2015, 04:48 PM   #100
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Quote:
Originally Posted by cordycord View Post
So it looks like there are lots of options for the Miata.
<br />
<br />turbo
<br />Rotrex
<br />K20/24
<br />V8 (LS)
<br />V6 Honda
<br />V6 (GM) LFX
<br />
<br />FTFY.
<br />
<br />And Rick, I have been thinking that as well. OEM does not necessarily mean track ready. Maybe we will find that it eats cams or valves or timing chains with sustained >5k RPM operation.
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