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PostPosted: December 22, 2009, 11:43 am 
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Well I've reached the stage of planning where I need to choose a donor for brakes, spindles, hubs, rear end, axles, pedals, etc. The engine I'm leaning towards now is only available in FWD configuration so it's no good to me, and the transmission I'm leaning towards (RX-7 TT) is readily available on eBay, but as far as I can tell, finding a 93-94 RX-7 to use as a donor would NOT be Locost.

My plan is to build a standard Locost with a 442E frame. It will be a fun car for good weather, with maybe an autocross run or two if I'm so inclined. With that in mind, I'm willing to sacrifice a little weight for comfort and cost savings. Here's what I'm looking for in a donor:

- 4 wheel discs
- 5-lug hubs
- ABS (I need wheel speed sensors at each corner)
- IRS
- LSD
- My ideal rear-end ratio is in the neighborhood of 2.8
- It'd be nice if the wheels were usable on my car, that'd be a good cost savings as well

So does such a vehicle exist? I recognize that buying all of these things separately would be quite a bit more expensive than finding the right donor, which is why I'm asking. Or are some of my "wants" unreasonable?

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PostPosted: December 22, 2009, 11:59 am 
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Other than an independent rear, a Mustang would seem to fit all of your needs, especially the super tall 2.8 rear axle ratio. What are/were you planning to use engine wise? Something big if you are looking at a 442E. What bolt pattern are the wheels you are looking to use?

Edit: Come to think of it, a Thunderbird (or Mercury Cougar/Lincoln MKVIII) would fit all of your needs I think. IRS, 5 lugs, ABS etc.


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PostPosted: December 22, 2009, 12:30 pm 
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It would be interesting to hit autotrader, ebay, and junkyards and see what pops up. I'm curious about cars like Volvo and BMW.

I second the T bird recommendation. +4 is a little wide for the usual Locost donor choices, IMO.

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PostPosted: December 22, 2009, 1:14 pm 
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It's funny that you mention the T-Bird, because I saw one on the way to work and it hit me that that might be a good choice. The only downside is the lack of a manual transmission (I believe the T-Bird SC was the only "modern" T-bird available with the manual trans, and again I run into the problem of finding a cheap donor) means I'd have to get pedals somewhere else.

I suppose I do need to ensure compatibility between the clutch master and slave cylinders and also the brake master cylinder and braking system.

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PostPosted: December 22, 2009, 1:16 pm 
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Laminar wrote:
It's funny that you mention the T-Bird, because I saw one on the way to work and it hit me that that might be a good choice. The only downside is the lack of a manual transmission (I believe the T-Bird SC was the only "modern" T-bird available with the manual trans, and again I run into the problem of finding a cheap donor) means I'd have to get pedals somewhere else.

I suppose I do need to ensure compatibility between the clutch master and slave cylinders and also the brake master cylinder and braking system.


Well you could probably get some Mustang components for the manual transmission. I expect a T5 would bolt up to any Thunderbird engine setup.

Out of curiosity, is there a reason you are straying from the more common Miata type of setup? Big power?


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PostPosted: December 22, 2009, 1:20 pm 
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gtivr4 wrote:
Other than an independent rear, a Mustang would seem to fit all of your needs, especially the super tall 2.8 rear axle ratio. What are/were you planning to use engine wise? Something big if you are looking at a 442E.


I'm not ready to divulge that yet, but it has more than four cylinders and should be putting out around 250hp. I'm 6'5" so a book frame isn't quite my size.

Quote:
What bolt pattern are the wheels you are looking to use?


No specific pattern in mind, I just have a thing for five lug wheels. I suppose I could live with four lugs, but at this point I'm still willing to be picky.

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PostPosted: December 22, 2009, 1:23 pm 
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The T5 does not fit the 4.6L except for a few early odd-ball engine blocks. The T45 from the mustang fits and has more torque capacity than the T5.

The issue with the tbird is the front spindles. They are very long. They have been cut and modified to accept a uca joint but I don't know about that. Locostv8 did it and all his pics are gone.

Most tbirds have drums on the back instead of discs.

You may be better off using a 80s rx7 turbo II and adding the tbird diff for the ratio you require.

My donor is a 4.6L tbird and a 98 cobra T45 but it is not traditional.

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Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
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Tiger Avon:114x40x13.3-12.6
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PostPosted: December 22, 2009, 1:31 pm 
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gtivr4 wrote:
Well you could probably get some Mustang components for the manual transmission. I expect a T5 would bolt up to any Thunderbird engine setup.

Out of curiosity, is there a reason you are straying from the more common Miata type of setup? Big power?


It's not necessarily power that's out of range of a Miata engine + boost, but I just never liked the sound a four cylinder makes, and if this is going to be "my" car, it's going to be exactly what I want. The engine should be around 370lbs and put out about 250hp/240tq.

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PostPosted: December 22, 2009, 1:36 pm 
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Now if only I had the capability to tow right now:

Quote:
Body Style: Coupe

Engine: turbo
Get a CARFAX Record Check
Ford 88 T-bird turbo coupe, body good shape, doesn't start, tow. $300. 765.346.8894
Listing Source: Lafayette Journal and Courier (IN)


According to Wikipedia, Turbo Coupes came with four wheels discs, ABS, and a Traction-Lok. Wouldn't that be perfect.

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PostPosted: December 22, 2009, 1:53 pm 
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And Craigslist shows a plethora of T-Birds and Cougars for under $1000 in Iowa.

I don't suppose using different front hubs/spindles would be too big of a deal as long as the bolt pattern matched up, right?

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PostPosted: December 22, 2009, 1:56 pm 
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The turbo coupe is not irs. The bolt pattern is 5 x 4.25 on the irs tbirds. There is a service which redrills the 4.25" pattern to 4.5" for about $150 or you could purchase cobra hubs.

Look for a merkur xr4ti.

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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


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PostPosted: December 22, 2009, 2:21 pm 
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Miatav8,MstrASE,A&P,F wrote:
The turbo coupe is not irs. The bolt pattern is 5 x 4.25 on the irs tbirds. There is a service which redrills the 4.25" pattern to 4.5" for about $150 or you could purchase cobra hubs.

Look for a merkur xr4ti.


Is the redrill just for a wider selection of rims? And the ninth-gen and earlier T-Birds were four lug like the Mustangs, right? There's only one Merkur in Iowa on CL and it's much to nice (and expensive) to pick apart.

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PostPosted: December 22, 2009, 3:00 pm 
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The redrill would be to match the front 5 x 4.5" from either the 80s tbird with ford ranger rotors or the rx7 turbo II.

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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


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PostPosted: December 22, 2009, 3:19 pm 
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Miatav8,MstrASE,A&P,F wrote:
The redrill would be to match the front 5 x 4.5" from either the 80s tbird with ford ranger rotors or the rx7 turbo II.


Ah, gotcha.

I had previously decided that an IRS would be worth the extra engineering/cost/complexity, but if I end up with a donor that has everything but the IRS, I suppose I could live with a live rear. Hey, it's still working for the Mustang GT.

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PostPosted: December 22, 2009, 3:44 pm 
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A solid axle is fine for a heavy car or a light car on a smooth surface.

Forget about the single donor for a moment.

Pick ranger rotors on 80s tbird/mustang uprights and a uca balljoint adapter, rx7 turbo II uprights and brakes, mustang II uprights and brakes, or ranger uprights and brakes. Don’t worry about track width.

Establish the rear track based on a drum brake, garden variety tbird irs and axles. Install cobra 5x4.5” hubs and brakes on the rear or redrill for a matching BP. There are two different cv splines so drilling is a safer bet.

Build your front suspension based on the established rear track. Choose a rack and pinion.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


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