383 240z Posted March 10, 2001 Share Posted March 10, 2001 Is any body out there running a non datsun diff. yet still using the I.R.S. I'm working on fitting a rear from a 1982 vette any help would be great! ------------------ rx7260z@yahoo.com Speed Power Performance& Style. What else is there? Quote Link to comment Share on other sites More sharing options...
blueovalz Posted March 11, 2001 Share Posted March 11, 2001 This guy may not live in Tulsa any more, but I know that he had a vett rear end in his car and made vett/Datsun hybrid (pardon the pun) half shafts. I raced against him a couple of times, and it seemed to work well. His name is Doug Turner. I'll send his (it's been a few years) phone number to your email address. Quote Link to comment Share on other sites More sharing options...
383 240z Posted March 12, 2001 Author Share Posted March 12, 2001 I tried the numbers you sent me but the new owner of the home number knows nothing about Terry or z-cars for that matter! I'll try the work number on monday wish me luck ------------------ rx7260z@yahoo.com Speed Power Performance& Style. What else is there? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted March 15, 2001 Share Posted March 15, 2001 You may want to look at the street rodder magazine (this months issue) they are putting in a newer vette IRS in a 50's car.It may not super strong but I think better gear selection than the R200. Sounds like you are in the same boat as me just like Jaguars that run stated in their book "spending the extra money on the decent setup is more cost effective than replacing or fixing it twice" Keep us posted on what you find out. ------------------ Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted March 16, 2001 Share Posted March 16, 2001 you could try 8.8 diff from late model tbird-lots of gears and lsd selection. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted May 7, 2001 Share Posted May 7, 2001 i am looking to mount a corvette rearend in my car and am trying to find info also. my biggest concern/reason for a vette rear instead of a t-bird or somthing is this: If the flange adaptor make an r200 take a chevy u-joint fo the driveshaft, will the same adaptor fit at the wheels? If so...you could mount a vette rear end, have full size shaft and u-joints to the tranny, and also have full size half shaft form factory vette flange at rear to the wheels.!!!! What do you think/know about this concept? Jake AZ 240Z Quote Link to comment Share on other sites More sharing options...
Modern Motorsports Ltd Posted May 7, 2001 Share Posted May 7, 2001 Jake, the driveshaft flange adaptor is unique to that location. Not applicable to halfshaft transitions, are you thinking custom halfshafts with this Ujoint adaptor? Vette diff is wider AIR (I had an '82 measured it up/toyed with the thought) so some sort of 'new' halfshaft is needed and telescoping unless you redesign the rear suspension. Vettes use halfshafts as structural members whereas Z's do not. You running some big power? OE R200 and CV halfshafts seem v. stout in reasonable use. It sure would be nice to achieve a decent install method for an IRS with greater gear selection though. The vette unit I had was 2.79's and it's gear range was 2.59's->3.73's keeping the same carrier.....nice range for us Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted May 7, 2001 Share Posted May 7, 2001 I am very interested in this topic but have a concern about the overall cost. I think most of you know I am big advocate of the R200/CV setup, but I am beginning to have some 2nd thoughts on my specific application based on where I expect to be in a couple of months from now. I have never had my engine dyno'ed but I do believe in the industry formulas and my projection is 440RWHP(@4250) soon. Applying the formula to calculate torque (see below), I come up with 543lb-ft . I think the R200/CV combo can handle that torque in a street car or one doing auto-x or road racing. Where my concern is in launching a 2800lb Z-car off a t-brake with sticky tires and getting full boost before the car has rolled a couple of feet. I am beginning to think that is asking too much. I certainly intend to continue using my setup but just thinking out loud. Is there anyone here running a solid rear end that is willing to reveal the actual cost so we can understand the alternatives? Is the T-Bird the same as the Mustang Cobra? Those Cobras are snapping CVs like twigs and they are nowhere close to having the low-end grunt of a prepped SBC or V-6 turbo. mep = hp x 792,000 / displacement x rpm torque = mep x displacement / 150.8 [ May 07, 2001: Message edited by: Scottie-GNZ ] Quote Link to comment Share on other sites More sharing options...
Guest needwaymorespeed Posted May 8, 2001 Share Posted May 8, 2001 I also toyed with the idea of a vette rearend-hell its a dana 44 there strong-same rear as a viper also- I think that the stub axles become a concern also and I personally like a cv joint rear end much better than u-joints Take a look at the r230 rears there viscous and have a 9 in ring gear-very tough!! they also have the cv joint half shafts-very big almost the same size as the porsche 933-the porsche is what they use in full size sand rails with ungodly ammounts of power- to see my personal answer to this dilemna check out wheels suspension and chasis forum titled rear suspension options for 400-500hp also do a search on r230 this is the rear thats in darius's car getting closert to having this project completed Curtis Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted May 8, 2001 Share Posted May 8, 2001 I've been looking at the Late Tbird rear ends as well. I priced them just for giggles, and its like 450.00 for the whole thing with brakes (disk ) and it can be had with a posi. Unfortuately I havn't seen a good clear foto of one yet to see how much of it could be used. Ideally, it'd be nice to use the whole deal and have the CV's shortened. If it could be worked out, it would eliminate the Datsun knuckle and stub axles all together. That said, it would in my case be more for a street/touring type car and not used to plant huge slicks to the ground. I know this rear was used in the later Cobra and there was some discussion about breaking it alot if slicks are used. Its 8.8 inch. Good ratio's too, thats the best part. At this point its a dream, I don't have the means or equipment to pull it off I don't think. Maybe one day. Lone [ May 07, 2001: Message edited by: lonehdrider ] Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted May 8, 2001 Share Posted May 8, 2001 i think scottie has some engineering problems that most of us will never have.he probably needs a r230 with some custom cv axles running some real race car cv joints.when i was off with my hernia surgury i found a magazine in the book store called race car enginering that had sources for this kind of stuff-like cv joints for racing dodge vipers.a ford 8.8 would probably be good for up to 300 or 350 hp and not shock loaded.i havent had any breakage problems but road racing is really only hard on brakes. Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted May 8, 2001 Share Posted May 8, 2001 Randy's opening sentence sums it up well. I hope my post does not scare anyone away from the OEM pieces. I also hate to see anyone spending an inordinate sum of money for an alternative when it is probably not necessary. The R200/CV pieces are readily available and comparitively cheap so I would encourage folks to go that route until it proves it cannot handle the task. Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted May 8, 2001 Share Posted May 8, 2001 Umm, the 8.8 cantake MUCH more than 350HP. Most of the Mustang guys I know who ar epushing say 600HP are still running 8.8s. They run C-clip eliminators, stronger axles, and the posi is different but the ringpinion isn't an issue that I know of. The T-bird I've seen, I don't think it's too far off from the Cobra. Bear in mind it was designed to mount to the SAME points as the FOX Mustang - same with the Cobra. That's two upper points that meet about where the pinion is on our cars and two lower arms that go straight forward for the solid axle cars. IF you guys want I canget pics of the Cobra setup and ask the shop I deal with to call me if an SC T-bird rolls in for work. The Cobra setup looks nice but is a PITA to change gears in and yes they're snapping them but upgraded axles are supposed ot be on the way... I'm not sure where this leaves Scottie. If you goto a solid axle I'm betting the launch will change completely and you'll have wheelstand issues. Can you say wheelie bars? My chasis shop indicated they could do a 'Vette rear easily enough but looking into it and the changes made narrowing it) I'm not sure this is a way to go as it supposedly changes geometry when you do that (according to a street rod mag). If you go with a different IRS but keep the struts you're going to snap stub axles. The R230 stuff sounds good but again, stub axlesstruts? I dunno Scottie, this is a tough one. You haven't wreaked too much carnage yet I don't think but until you come up with an alternative I'd certainly coinsider some loops back there to protect the gas tank (ulp). Quote Link to comment Share on other sites More sharing options...
Guest needwaymorespeed Posted May 10, 2001 Share Posted May 10, 2001 A quick comparo 240z stub axle 1.015 diameter 25 splines that are 1.125long 300 z twin turbo outbord cv shaft-acts as the stub axle 1.300diameter 32 splines that are 2.285 inches long. The beefy oem axles -The best ones they made-for a ford 9 in rear end have only 31 splines. I dont think that theyll be any worries with the complete r230 setup till youre over 650 hp. Curtis Quote Link to comment Share on other sites More sharing options...
Guest John Adkins Posted May 10, 2001 Share Posted May 10, 2001 Has anyone thought of early Olds Toronado CV joints w/ custom axle shafts? These were made to take the torque of a 455 Olds... I think these would solve any CV joint breakage problems. I don't know how available they are anymore, however. Use these with an R230, Dana 44, ford 8.8 ,etc... But what would custom axles cost? Quote Link to comment Share on other sites More sharing options...
Guest John Adkins Posted May 10, 2001 Share Posted May 10, 2001 Has anyone thought of early Olds Toronado CV joints w/ custom axle shafts? These were made to take the torque of a 455 Olds... I think these would solve any CV joint breakage problems. I don't know how available they are anymore, however. Use these with an R230, Dana 44, ford 8.8 ,etc... But what would custom axles cost? Quote Link to comment Share on other sites More sharing options...
383 240z Posted May 12, 2001 Author Share Posted May 12, 2001 Well I must answer to what seems to have become a hot topic the fitting of the vette diff came from a friend of mine from texas we had cut down a the vette rear and left the bushings facing fore-to-aft, fit a chunk of c-channel pulled the two vertical bolts that held the mustach bar into place bolted the c-channel up to the frame then bolted the diff to the c-channel I'll write a tech sheet on this as soon as I get some time (summer is tough for me wife wants things done to the house I want to play with my toys and race cars) Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted May 14, 2001 Share Posted May 14, 2001 BTW - got a CLEAR look at a Cobra IRS th eother day - didn't have my camera though. It had the tank pulled and you could see everything. They run a tube across th eback of the suspensiondiff to support everything and it's mounted using just a couple of points. I know this setups isn't much in the running since the Cobra guys seem to be snapping things but it looked pretty straightforward and there's a million gear sets available for it... Quote Link to comment Share on other sites More sharing options...
Guest Thurem Posted June 5, 2001 Share Posted June 5, 2001 Has anyone ever considered, "The other, other white meat!". BMW has had IRS for ever. My friend who is a BMW specialist says he's run as much as 650 hp on a stock BMW rearend, and they look like it would be a piece of cake fitting one with CV shafts and all that to a Datsun. Thure Quote Link to comment Share on other sites More sharing options...
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