Miata LFX Swap (Singular Motorsports & Good-Win Racing) - Page 4 - Miata Turbo Forum -Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions. KMiata

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 07-14-2015, 04:22 PM   #61
Supporting Vendor
Thread Starter
iTrader: (3)
 
Join Date: Jul 2006
Location: San Diego
Posts: 2,567
Total Cats: 226
Default

In other words, gobs of torque at idle.

-Ryan
ThePass is offline   Reply With Quote
Old 07-14-2015, 04:41 PM   #62
Junior Member
 
Join Date: Jul 2015
Location: grayson, ga
Posts: 96
Total Cats: 5
Default

Quote:
Originally Posted by ThePass View Post
In other words, gobs of torque at idle.

-Ryan
yup, that's what i'm thinking.
portabull is offline   Reply With Quote
Old 07-14-2015, 04:46 PM   #63
Elite Member
iTrader: (3)
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 5,807
Total Cats: 551
Default

Yay! We can run the AC compressor! (jk)
hornetball is offline   Reply With Quote
Old 07-14-2015, 04:54 PM   #64
Supporting Vendor
Thread Starter
iTrader: (3)
 
Join Date: Jul 2006
Location: San Diego
Posts: 2,567
Total Cats: 226
Default

Quote:
Originally Posted by hornetball View Post
Yay! We can run the AC compressor! (jk)
Yep, to your little heart's content!

Hey, the C7R has A/C and the drivers at Le Mans were praising it...
ThePass is offline   Reply With Quote
Old 07-14-2015, 05:13 PM   #65
Junior Member
 
Join Date: Jul 2015
Location: grayson, ga
Posts: 96
Total Cats: 5
Default

the thing i like about this is there's only about 10.5% drivetrain loss on the hp side, and ~8% on the torque curve. most of the time you have to figure 15-20% drivetrain loss and what v8r's curve is showing about half of that loss. nothing but win all the way around.
portabull is offline   Reply With Quote
Old 07-14-2015, 05:42 PM   #66
Moderator
iTrader: (9)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, FL
Posts: 13,392
Total Cats: 1,015
Default

20 ft lb dip at 2000rpm makes the engine totally worthless.
-every m.net supercharger guy
sixshooter is offline   Reply With Quote
Old 07-14-2015, 05:48 PM   #67
Elite Member
iTrader: (3)
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 5,807
Total Cats: 551
Default



This thread is winning.
hornetball is offline   Reply With Quote
Old 07-14-2015, 08:28 PM   #68
Senior Member
iTrader: (5)
 
Join Date: Jul 2005
Posts: 715
Total Cats: 53
Default

This is pretty awesome! With that much torque down-low, I am surprised they have such a low 1st gear!!!
bcrx7 is offline   Reply With Quote
Old 07-14-2015, 08:38 PM   #69
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 33,150
Total Cats: 1,988
Default

200tq off idle is pretty sweet.
18psi is offline   Reply With Quote
Old 07-14-2015, 08:48 PM   #70
SadFab Sales Lady
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,783
Total Cats: 930
Default

<p>
Quote:
Originally Posted by bcrx7 View Post
This is pretty awesome! With that much torque down-low, I am surprised they have such a low 1st gear!!!
</p><p>Burnouts&nbsp;<img alt="" src="http://www.miataturbo.net/images/smilies/skid.gif" style="height:72px; width:40px" title="" /></p>
aidandj is offline   Reply With Quote
Old 07-14-2015, 09:29 PM   #71
Junior Member
 
Join Date: Sep 2011
Location: Prescott, AZ
Posts: 294
Total Cats: 16
Default

Quote:
Originally Posted by aidandj View Post
<p></p><p>Burnouts&nbsp;<img alt="" src="http://www.miataturbo.net/images/smilies/skid.gif" style="height:72px; width:40px" title="" /></p>
More like 4000lb Camaros...
Roda is offline   Reply With Quote
Old 07-14-2015, 09:48 PM   #72
I take big bites
iTrader: (1)
 
turbofan's Avatar
 
Join Date: Sep 2010
Location: Portland, OR
Posts: 5,983
Total Cats: 409
Default

<p>Damn.</p><p>&nbsp;</p><p>So in the end, how will this cost compare with a V8 swap?</p><p>&nbsp;</p><p>What's the weight of an LFX w/o accessories VS a LS3? I seem to remember the LS3 is like 370 I believe without accessories. More displacement, but 75% fewer cams.</p>
turbofan is offline   Reply With Quote
Old 07-14-2015, 10:42 PM   #73
Junior Member
 
Join Date: Jan 2009
Posts: 123
Total Cats: 21
Default

345lb according to gmauthority.com but that doesn't specify with or without accessories. Transmission is also significantly lighter than the T56
unk577 is offline   Reply With Quote
Old 07-14-2015, 11:22 PM   #74
Supporting Vendor
Thread Starter
iTrader: (3)
 
Join Date: Jul 2006
Location: San Diego
Posts: 2,567
Total Cats: 226
Default

Quote:
Originally Posted by turbofan View Post
So in the end, how will this cost compare with a V8 swap?</p>What's the weight of an LFX w/o accessories VS a LS3?
Both questions that I can't fully answer yet, but intend to.

Of course you can add up the prices for the assorted swap bits from V8R and get a fairly accurate ballpark for what the junkyard parts will run you with a little research, but this never gives the full picture of what it really costs to make the thing a finished, polished, fully operating thing. I'll be keeping an accurate, public tab on the costs that go into this project. Some of the items on the list won't be mandatory for the next guy doing the swap (more complicated cooling system and exhaust for example) but an itemized tab will enable those following along to add up what they would need, omit what they may not, and get a "real" idea of what to budget.

I plan to do the same thing with weights, noting everything that goes on or comes off, including scaling the car in race trim just before we start tearing it apart and then again when it is finished.

I have the majority of the parts at this point. I'll get to work on that tab tonight for the parts already acquired.

-Ryan
ThePass is offline   Reply With Quote
Old 07-15-2015, 04:59 AM   #75
Junior Member
 
Join Date: May 2007
Location: Atlanta
Posts: 286
Total Cats: 24
Default

So I can't let my dad be faster than me.

My 94 Begi S4, MS3, 265hp@12psi has made me pretty happy, but I'm pretty sure the LFX would beat it. Especially after I discovered my valve seats were machined too thin. So after I complete his LFX swap I'm building an LS3. And I'm keeping spreadsheets.

Right now his build is $9775, and it's almost complete. The only big ticket item is going to be an exhaust fab at enthuzacar, otherwise it's just fluids and AN fittings.

I've been gathering parts - but I'm taking my time, looking for deals, while I complete his. But my total is $8072 and I'm still lacking a T56 (~2k), Differential kit (~2k), Engine accessories (~800), Differential (~400), ECU, wiring, fluids, sensors, etc. My LS3 is an L92 with 40k fitted with DoD delete and LS3 heads, but I only paid $2,800 for that versus a crate engine (6.8k with accessories). And this is without buying GM's LS3 controller kit ($1100) which includes ECU, pedal, and harness - I'm going with a stock harness ($250) and modifying it.

Any way you slice it - the LFX is cheaper.

Either way - I'm expecting to have about 16k in my build (and being thrifty about it), and I expect my dads will be done for 11k.

Labor-wise, the only major difference between the two builds is the transmission tunnel modification necessary to fit the T56 bellhousing.

As the saying goes, speed costs money: how fast can you afford to go?

I'm gonna be pissed if I end up liking his LFX's power delivery more than my LS3.
gooflophaze is offline   Reply With Quote
Old 07-15-2015, 12:08 PM   #76
Senior Member
iTrader: (2)
 
Join Date: Dec 2008
Location: KY
Posts: 610
Total Cats: 33
Default

Anyone know how this falls into NASA TT? TT3 would be a perfect fit but I don't know how they handle the tubular subframe. The rules say factory subframe is required but I know I've seen V8 swapped miatas in TT1-3.
jpreston is offline   Reply With Quote
Old 07-15-2015, 01:04 PM   #77
Junior Member
 
Join Date: Jul 2015
Location: grayson, ga
Posts: 96
Total Cats: 5
Default

Quote:
Originally Posted by sixshooter View Post
20 ft lb dip at 2000rpm makes the engine totally worthless.
-every m.net supercharger guy
you're right, it's shameful that gm let that happen. shameful.
portabull is offline   Reply With Quote
Old 07-15-2015, 08:59 PM   #78
Senior Member
 
Join Date: Jan 2013
Location: Gilbert, AZ
Posts: 610
Total Cats: 72
Default

Quote:
Originally Posted by jpreston View Post
Anyone know how this falls into NASA TT? TT3 would be a perfect fit but I don't know how they handle the tubular subframe. The rules say factory subframe is required but I know I've seen V8 swapped miatas in TT1-3.
If you have a tubular sub frame the car is now classified as a "Non-production vehicle" and you take a power to weight penalty for it. Penalty is -0.4lbs/HP for TT1 and TT2 and -0.7lbs/HP for TT3.

This also means that the production vehicle modification factors don't apply to you which are:

4-door Sedan or 5-door Wagon +0.2
Modification of OEM roof line/shape -0.3
Modification of floor pan or rocker panel for side exit exhaust clearance -0.2
TT-3 Only: Non-OEM Aero -0.4
Arca_ex is online now   Reply With Quote
Old 07-15-2015, 09:22 PM   #79
Senior Member
iTrader: (2)
 
Join Date: Dec 2008
Location: KY
Posts: 610
Total Cats: 33
Default

That was the only solution I could see too but I wasn't sure if Greg was giving specific allowances on a per swap basis. So roughly an 80lb penalty for a TT3 miata that's already planning to run aero.
jpreston is offline   Reply With Quote
Old 07-16-2015, 12:37 AM   #80
Supporting Vendor
Thread Starter
iTrader: (3)
 
Join Date: Jul 2006
Location: San Diego
Posts: 2,567
Total Cats: 226
Default

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
ThePass is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Toyota Pickup Engine Swap B.S. Monk Build Threads 23 07-12-2016 04:25 PM
Foreign powered NB for NASA ST3 and/or E0 d k Race Prep 44 09-15-2015 11:59 AM
New to Miatas cheeseclock Meet and Greet 15 09-12-2015 09:53 AM
Twitchy car (tail happy problem) bigben Race Prep 16 09-11-2015 04:41 PM
WTB parts for HPDE car Voltwings WTB 5 09-11-2015 09:23 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 05:40 AM.