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Thread: Limited Slip Differential (T2 LSD?)
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Brad
Rotorhead
Posts: 1672
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posted October 17, 2005 07:15 PM |
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sparky
Redlining
Posts: 299
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posted October 18, 2005 09:05 PM |
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There was a FD3S LSD rear end on ebay a couple of days ago. Starting price was 175.00. Auction expired and no one bid at all.
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'77 REPU
Stock 6-port
T-2 tranny
Weber IDA 48
Alum Flywheel
3rd gen Torsen in rear end.
DLDFIS ignition
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Brad
Rotorhead
Posts: 1672
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posted November 14, 2005 08:52 AM |
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Quick Update
Chris is working on a kit to sell us, complete with all parts, hardware, and instructions. Just take it with your Torsen and REPU rear to a rear end shop and say "Do this."
When it's done I'll let you know.
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-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge
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prcracer
1st Gear
Posts: 33
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posted February 12, 2006 04:20 PM |
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OK, I took the bull by the horns and borrowed a second gen turbo third member from a RX7 buddy and took the third member out of my REPU and took them both apart this Saturday. I am so sure the RX7 LSD will work I am having a spacer made this week and I will let you know if the whole thing will work.
I will use the REPU ring and pinion but to do so requires the holes in the LSD to be enlarged and longer bolts installed because of a 11mm spacer between the ring gear and the carrier. This appears to be the only modification necessary to put the RX7 LSD in the REPU third member.
Stay tuned for the next installment.
Jeff
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prcracer
1st Gear
Posts: 33
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posted February 18, 2006 05:54 PM |
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Well I got the spacer machined this week and found the longer bolts. Everything went together just as it should. I now have a REPU third member with a LSD in it sitting on my bench ready to go back in the housing. No grinding, swearing, hammering or any thing out of the ordinary. It is almost as if it was suppoosed to be there in the first place.
Jeff
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klaus42
Rotorhead
Posts: 1877
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posted February 19, 2006 10:17 AM |
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Nice!
...eagerly awaiting your next report of continued success...
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prcracer
1st Gear
Posts: 33
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posted February 20, 2006 03:45 PM |
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Success! It works, the only grinding or modification necessary was to notch the flange of the axle housing to allow the "new" LSD carrier to slip in. When I took the RX7 third member out of it's housing I noticed the same "notch" in their flange from the factory. I kind of had an idea I would have to do it on the REPU too. The spacer is .423" thick and you have to find some 12mm x1.5 x35mm grade 10 bolts. You can grind the third menber or machine the head down on the bolts to get them to clear, I did the latter.
I think this was a lot easier than changing the whole axle, unless you want a different bolt pattern for your wheels.
Jeff
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Brad
Rotorhead
Posts: 1672
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posted February 20, 2006 04:07 PM |
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quote:
Success! It works, the only grinding or modification necessary was to notch the flange of the axle housing to allow the "new" LSD carrier to slip in. When I took the RX7 third member out of it's housing I noticed the same "notch" in their flange from the factory. I kind of had an idea I would have to do it on the REPU too. The spacer is .423" thick and you have to find some 12mm x1.5 x35mm grade 10 bolts. You can grind the third menber or machine the head down on the bolts to get them to clear, I did the latter.
I think this was a lot easier than changing the whole axle, unless you want a different bolt pattern for your wheels.
Jeff
Way to go!!! Howz it drive? When Chris Greene put the TORSEN in his REPU he said the bolts kept backing out of the ring gear. I'm thinking blue loctite.
Spec Miata racers use red loctite and they still back out!
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-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge
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klaus42
Rotorhead
Posts: 1877
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posted February 21, 2006 09:33 AM |
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What did the factory use...
...on the Torsen's bolts, originally, to keep 'em in place? Or, why is the modded REPU setup more prone to 'em backing out?
(Congratulations on your success! Hope she holds together...)
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Brad
Rotorhead
Posts: 1672
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posted February 21, 2006 11:42 AM |
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Chris's Torsen is behind a 450whp turbochared 13b and gets autocrossed hard.
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-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge
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klaus42
Rotorhead
Posts: 1877
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posted February 21, 2006 03:47 PM |
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I'll bet...
...it does get run hard, at that! :D
...must be fun...
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prcracer
1st Gear
Posts: 33
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posted February 21, 2006 04:43 PM |
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I haven't driven it yet as the motor isn't in the truck yet. That is the next step in the project. I will let you know as soon as I have driven it.
This truck is to be a rally truck and it looks like the first event will be Rim of the World in May. I used to run a Jeep Comanche pick up and have won that event in my class several times.
Jeff
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klaus42
Rotorhead
Posts: 1877
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posted February 22, 2006 01:11 PM |
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Nice!
Here's hoping you really kick ass in the REPU!!!
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admin
Administrator
Posts: 446
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posted March 08, 2006 03:28 PM |
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Spacer Pics
Do you have pics of this spacer, or other dimensions?
A drawing of the whole assembly would be good, or pics of the whole thing spread out on the ground would be better ;)
Thanks!!
--dan
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prcracer
1st Gear
Posts: 33
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posted March 09, 2006 03:32 PM |
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I will get a few pictures and dimensions together and post them. It will be a little while, I have another part of this project going right now.
Thanks,Jeff
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sparky
Redlining
Posts: 299
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posted March 10, 2006 08:06 AM |
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When you take your pictures can you grab one of the notch you grinded to slip in the carrier. I'll probably be getting a LSD new. I don't have access to a 2nd gen rx-7 3rd member to compare mine to. Thanks.
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'77 REPU
Stock 6-port
T-2 tranny
Weber IDA 48
Alum Flywheel
3rd gen Torsen in rear end.
DLDFIS ignition
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Brad
Rotorhead
Posts: 1672
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posted April 24, 2006 08:52 PM |
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is the Fling-PU ready for the Rim?
quote:
I haven't driven it yet as the motor isn't in the truck yet. That is the next step in the project. I will let you know as soon as I have driven it.
This truck is to be a rally truck and it looks like the first event will be Rim of the World in May. I used to run a Jeep Comanche pick up and have won that event in my class several times.
Jeff
Hi Jeff,
Is the Fling-PU ready for the Rim? If so let me know, I may head up there on Sat to spectate!!!!!!!
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-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge
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prcracer
1st Gear
Posts: 33
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posted April 25, 2006 05:32 PM |
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No, I am sad to say! It seems everything takes longer than you estimate. I should have the engine and trans back in the truck this weekend though.
I was going to go to Rim any way but with the price of gas now I think I will stay in Prescott and work on the REPU.
Jeff
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VincenzoL
Revvin Up
Posts: 76
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posted April 27, 2006 12:28 AM |
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quote:
Success! It works, the only grinding or modification necessary was to notch the flange of the axle housing to allow the "new" LSD carrier to slip in. When I took the RX7 third member out of it's housing I noticed the same "notch" in their flange from the factory. I kind of had an idea I would have to do it on the REPU too. The spacer is .423" thick and you have to find some 12mm x1.5 x35mm grade 10 bolts. You can grind the third menber or machine the head down on the bolts to get them to clear, I did the latter.
I think this was a lot easier than changing the whole axle, unless you want a different bolt pattern for your wheels.
Jeff
Oh man, I feel silly with my rear end project now. This sounds easier and stronger.
I also don't like the drums though and the 6 bolt wheel pattern is terrible. IMO the LSD is only part of the problem when it comes to REPU rear ends.
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I'd buy that for a dollar!
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klaus42
Rotorhead
Posts: 1877
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posted April 27, 2006 12:06 PM |
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Nothing is easy...
...nothing worth doing right the first time, that is...
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| All times are PST (US)
[' This thread is 7 pages long:
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7 '] |
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