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Old 07-05-2015, 01:45 PM   #21
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Which transmission will you be using for this swap?
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Old 07-05-2015, 07:18 PM   #22
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<p>Subd</p>
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Old 07-05-2015, 07:59 PM   #23
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Awwwww Yissss. Saw the Instagram update, glad there's a thread now.

Car will turn out legendary. Sub'd for fine fabrication fancy-work.
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Old 07-05-2015, 08:03 PM   #24
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Quote:
Originally Posted by noname4me View Post
Which transmission will you be using for this swap?
Debated over this for a while. The Camaro comes with an Aisin LY6 6-speed with the "MV5" designation. That box has some interesting ratios. From 1st to 6th gear: 4.48 / 2.58 / 1.63 / 1.19 / 1 / 0.75

1st and 2nd are super short, 3rd has a big drop and is very long, then 4th is very short again. I can think of arguments for and against this, depending on the specific scenario/track.

The base model Cadillac CTS uses the same engine, and has a manual gearbox option - that transmission is the MV7, and it has much more evenly-spaced ratios: 4.16 / 2.51 / 1.69 / 1.27 / 1 / 0.75

To visualize the differences between the two transmission, I graphed them:



I decided to go for the MV7. Turns out this trans is rather rare - likely because the base model CTS is rarely chosen with a manual - but I finally found one with low miles in Texas and had it shipped over. $1200 including freight:


Attached Thumbnails
Miata LFX Swap (Singular Motorsports &amp; Good-Win Racing)-80-gearing_overlay_lfx_mv5_vs_cts_mv7_dbab68d7530d2d73d6dcefb228f6cc3970dbeff3.jpg   Miata LFX Swap (Singular Motorsports &amp; Good-Win Racing)-80-b249b782_f942_425d_8ca8_5a05e67790e9_zpsbkol5iq6_d3bb435637b289faa4598d852d616946cf68ea0e.jpg  
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Old 07-06-2015, 10:36 AM   #25
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did you check out the price of a new trans? when i was doing my swap it was cheaper to buy a t56 straight from tremmic vs. used+rebuild.
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Old 07-06-2015, 10:59 AM   #26
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What are you doing for wiring? Making a standalone harness out of the factory harness? I'm not finding ECU pinouts online.

What about gauges? It looks like a Racepak logger would pair nicely with the OBD2 module.
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Old 07-06-2015, 11:41 AM   #27
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Quote:
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Going with V8R's Getrag Stage 2 which consists of the diff mount, axles rated for 550 ft-lbs, full billet replacement hubs with ARP studs, and driveshaft. This is their same kit as designed for the V8 cars, but with driveshaft specific to the transmission. Opted for the aluminum driveshaft because race car.

Most of those parts are en-route right now, but the Getrag diff mount is already here. The two bare steel tabs get welded to the Miata rear subframe:
Are you sticking with the CTS clutch-type LSD? One of my friends has the CTS clutch-type in his V8-swapped car and wasn't very happy with it last time I talked to him. Lots of wheel spin.

I feel like this has already been discussed in one of the other LFX threads, but would a miata diff with 3.63 and OS Giken be an option for an LFX swap?
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Old 07-06-2015, 11:46 AM   #28
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Quote:
Originally Posted by jpreston View Post
Are you sticking with the CTS clutch-type LSD? One of my friends has the CTS clutch-type in his V8-swapped car and wasn't very happy with it last time I talked to him. Lots of wheel spin.

I feel like this has already been discussed in one of the other LFX threads, but would a miata diff with 3.63 and OS Giken be an option for an LFX swap?
I would recommend not running the miata Diff. As stock motors can kill one of those. add in +200ftlbs and you'll be changing out diffs regularly.
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Old 07-06-2015, 01:08 PM   #29
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Quote:
Originally Posted by OGRacing View Post
I would recommend not running the miata Diff. As stock motors can kill one of those. add in +200ftlbs and you'll be changing out diffs regularly.
Since when are stock motors blowing diffs? The only time I have seen that happen is 1.6l open diffs. Most high horsepower builds here still utilize the stock diff or OS Giken replacement and they seem to hold up just fine.
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Old 07-06-2015, 01:21 PM   #30
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Stock r&p are supposedly good for like 500+. Add in torsen and you can blow one with
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Old 07-06-2015, 02:08 PM   #31
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Quote:
Originally Posted by Ryan_G View Post
Since when are stock motors blowing diffs? The only time I have seen that happen is 1.6l open diffs. Most high horsepower builds here still utilize the stock diff or OS Giken replacement and they seem to hold up just fine.
Most of the big spec miata teams bring many spares. It's fairly regular i see team thrashing between races to replace them.
I should clarify. On the street, i doubt you'll blow one on stock power.
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Old 07-06-2015, 02:14 PM   #32
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Are you sure those aren't 1.6 diff's?
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Old 07-06-2015, 03:03 PM   #33
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Quote:
Originally Posted by acedeuce802 View Post
What are you doing for wiring? Making a standalone harness out of the factory harness? I'm not finding ECU pinouts online.

What about gauges? It looks like a Racepak logger would pair nicely with the OBD2 module.
V8R will be walking me through the wiring changes needed. It's my understanding that they are working on an off-the shelf solution for that, but I'm doing the swap ahead of the release of that product.

For gauges, I'll likely go spartan at first and re-use my Accutech water/oil temp gauges, and just worry about getting the tach working. I completely agree, the way to go is a digital dash that pulls all the data straight from the ECU, but I'll need to delay that purchase after the higher priorities are addressed.

-Ryan
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Old 07-06-2015, 03:04 PM   #34
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Quote:
Originally Posted by jpreston View Post
Are you sticking with the CTS clutch-type LSD? One of my friends has the CTS clutch-type in his V8-swapped car and wasn't very happy with it last time I talked to him. Lots of wheel spin.

I feel like this has already been discussed in one of the other LFX threads, but would a miata diff with 3.63 and OS Giken be an option for an LFX swap?
I've heard good things about the getrag diffs. The V8R "spec" cars all run them in their L33 V8 swapped cars with good results according to Shandelle, and others have reported that they are an upgrade in behavior from the Torsen. Also good ground clearance (for flat bottom). If I turn out to not like it, I'll explore other options.

-Ryan
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Old 07-06-2015, 03:21 PM   #35
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Quote:
Originally Posted by ThePass View Post
I've heard good things about the getrag diffs. The V8R "spec" cars all run them in their L33 V8 swapped cars with good results according to Shandelle, and others have reported that they are an upgrade in behavior from the Torsen. Also good ground clearance (for flat bottom). If I turn out to not like it, I'll explore other options.

-Ryan
Once you have power a forgiving Diff is nice to have. I run a plane 28 spline viscus out of a mustang. i don't feel the need for anything more.
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Old 07-08-2015, 02:28 PM   #36
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is your shift linkage steel or aluminum? thanks!
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Old 07-08-2015, 02:44 PM   #37
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is your shift linkage steel or aluminum? thanks!
Linkage is steel. V8Roadsters will be offering a modified linkage to fit the Miata. Pics of that when it arrives here.

-Ryan
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Old 07-08-2015, 06:53 PM   #38
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I'm doing the same swap, haven't made a thread over here yet. Using the MV7 as well. Need to update the threads as we've gone a few step backs while I fixed my brothers car, but we're starting to move forward again. My dad watched some of turbotom's V8 build and we ended up making DIY lizardskin for $30 and installing the IL motorsports bushings. After carnut's build (and being able to see the car in person as he's local to us) we decided the modified oil pan was necessary and pulled the engine back out and put it on a stand. Just got the oil pan delivered today. I'm trying to document as much as possible for part numbers and howto's. Next big thing I'm about to tackle is converting the automatic wiring harness to manual and making a standalone harness from scratch. Feel free to ping me with any questions.

Portabull's noname 96 LFX Swap

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Old 07-09-2015, 09:07 AM   #39
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V6 all the miatas.

Subscribed for awesome swap.
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Old 07-09-2015, 11:54 AM   #40
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one more question about your shift linkage: does it have a u-joint in the middle leg? thanks!
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