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PostPosted: Tue Nov 04, 2008 1:11 pm 
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Location: sydney
Hi,

Im in need of a big clutch and C.V's/Driveshafts for my FJ powered 1600. It made 390rwhp on 28psi and has been ok on the street with my current setup. However, Ive just set it up for drag racing with 26x8.5 MT drag slicks and front runners. Anyway long story short, I went out to WSID to run the car for the first time with only a Heavy Duty FJ20 clutch and Datsun 260z unijointed shafts (Diff is 3.9 r200 lsd with nismo centre) and not suprisingly in the burnout the clutch slipped alot, then on the first launch dumped the clutch and broke both driveshafts.(I can see everyone laughing whilst reading this...haha)

I knew the current setup wouldnt be up to the job but I thought I may have gotten a few passes out of it before destroying someting. Anyway so now I need to sort out both of these issues and wanted to know what clutch and shaft options i have. Im willing to ditch the unishafts for a C.V type conversion is this will help me get the car down the track.

Help needed,

Cheers,
Blayne

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PostPosted: Tue Nov 04, 2008 5:40 pm 
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Location: Hobart
I have and am about to fix a similar problem.

Talk to Feral Errol at Datrats, he should have a bolt in CV kit to suit.


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PostPosted: Wed Nov 05, 2008 9:23 am 
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Location: New Zealand
Heard from the states these are pretty strong

http://www.wolfcreekracing.com/wcrcvhalfshaftaxlekit.pdf

they are pretty damn expense thou =(


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PostPosted: Wed Nov 05, 2008 1:59 pm 
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Errol is buying the WCR from the states. They are the same kit. They use porsche size (not OEM) CV's.

Perhaps we can organise a group buy???

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PostPosted: Thu Nov 06, 2008 7:39 am 
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Wouldn't a setup like this be a cheaper idea?

http://www.rumblemotorsport.com/datsun/drvtrain.shtml

I am trying to do the same but with an R180 diff for rallying in a 200B.

I have a set of the wolf creek shafts in my PRC Datsun 1600 Rally Car, but we are not talking about the same kind of power!!! Previous comments are that driveshafts have been braking inside the diff, so perhaps the wolf creek ones won't fix that??

See my post about 280ZXT CVs. Sounds like they may just fit straight in a R200. Probably need to change over to the 280ZXT axles as well or can buy an adapter plate from the US.

Mark

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Datsun 1600/H510 PRC Rally Car - L20B under 2 litre, EFI, 5 speed Hollinger, 5.1 LSD.

Datsun 1600/H510 PRC Rally/Road Car - L20B under 2 litre, downdraft webber, extractors, 5 speed.

Datsun 1600/H510 Clubman Rally Car - Autech SR20 EFI, SR20 "Option 1" copy, 4.8 LSD.


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PostPosted: Thu Nov 06, 2008 8:33 am 
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Mark,

Nice post. I was considering making some CV drive shafts from scratch similar to the wolf creek ones.
Might be easier to simply buy the WCR...

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PostPosted: Thu Nov 06, 2008 10:16 am 
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I asked Errol at Datrats and he just replied :

Quote:
The Wolf Creek R180 C.V. Joints are suitable for up to 250 ft/lb torque. The 280ZX are able to handle about 220 ft/lb due to their smaller diameter.

It is largely the effective diameter of the CV joint (ball centre PCD) that determines the torque capacity. The shaft diameter is not the limiting factor. A smaller diameter CV requires smaller balls and grooves so less torque capacity.

I am currently having CV’s made up similar to the WCR ones, but using a better grade of chrome moly for the shafts. The WCR design is OK but the drive flanges have threaded helicoils fitted to the alloy adapters and the bolts are in single shear. With big torque this will pull the helicoils in the alloy making them loosen continually.

The R180 conversion I am doing at the moment uses Kaaz R180 LSD’s with modified plug in shafts. These connect directly to 6 bolt 86mm PCD CV’s without an adapter. They also have a flange fitted to the inside of the axle so the flange bolts are in double shear compared to the single shear WCR design. These things are all aimed at increasing reliability of the 6 bolt 86mm PCD shafts but they still will only handle 250 ft/lb torque reliably. To upgrade the CV’s for torque above 250 ft/lb, you would have to go to an R200 with appropriate sized CV’s and shafts.


A drag environment. The momentary torque loading in the start situation with slicks can be well over 400 ft/lb so I don’t think the R180 shafts will be suitable in this use.

I would be going for a custom shaft similar in size to a Z32 R200 with an appropriate larger diameter CV that will handle the torque loads. The later R200 plug in drive flanges are adequate so this conversion shouldn’t be too much of a problem.



Cheers Errol

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Datsun 1600/H510 PRC Rally Car - L20B under 2 litre, EFI, 5 speed Hollinger, 5.1 LSD.

Datsun 1600/H510 PRC Rally/Road Car - L20B under 2 litre, downdraft webber, extractors, 5 speed.

Datsun 1600/H510 Clubman Rally Car - Autech SR20 EFI, SR20 "Option 1" copy, 4.8 LSD.


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PostPosted: Thu Nov 06, 2008 10:29 am 
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Did Errol give any indication as to the cost of these new CV's?
Might be interested in a set...

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PostPosted: Thu Nov 06, 2008 12:00 pm 
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He is making four sets and they won't be ready for another 2 or 3 weeks. He hasn't worked out a price yet (I have put my name down for one of them, subject to price).

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Datsun 1600/H510 PRC Rally Car - L20B under 2 litre, EFI, 5 speed Hollinger, 5.1 LSD.

Datsun 1600/H510 PRC Rally/Road Car - L20B under 2 litre, downdraft webber, extractors, 5 speed.

Datsun 1600/H510 Clubman Rally Car - Autech SR20 EFI, SR20 "Option 1" copy, 4.8 LSD.


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PostPosted: Thu Nov 06, 2008 6:06 pm 
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Hey thanks for the replies.

So the Wolf Creek C.V's (Porsche style) are suited to an R180? I have an R200 and am running 26x8.5 Mickey Thompson Et drag slicks. I was thinking of going with something like those but now im not too sure after reading Errols reply...
Am i correct in reading that the Porsche style C.V's are only designed for about 250ft/lb? Im fairly sure that this wont be enough, with 400rwhp my car is producing way more than 250ft/lb leaving the line. Then there's the shock loading when dumping the clutch which makes it even worse...hmmmmm.... What to do, what to do...........

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PostPosted: Thu Nov 06, 2008 6:12 pm 
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Speak to Errol from Datrats. The Wolf creek racing ones will fit R160 to R200 (length of shafts vary on which diff and car you nominate) and bolt up to 4 bolts each end.

Sounds like Errol's ones will be stronger and he may have an even better solution for drag racing.

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Datsun 1600/H510 PRC Rally Car - L20B under 2 litre, EFI, 5 speed Hollinger, 5.1 LSD.

Datsun 1600/H510 PRC Rally/Road Car - L20B under 2 litre, downdraft webber, extractors, 5 speed.

Datsun 1600/H510 Clubman Rally Car - Autech SR20 EFI, SR20 "Option 1" copy, 4.8 LSD.


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PostPosted: Thu Nov 06, 2008 10:31 pm 
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OK, stupid question of the week, how do you get driveshaft bolts in double shear ? I can't see it :?:

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PostPosted: Fri Nov 07, 2008 8:08 am 
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From what Errol has said, think it is having 1 set of bolts going all the way through the CV drive flange & coupling ring, instead of having separate bolts holding each of the 3 parts separately (Wolf Creek ones have individual bolts holding each part to the other, Datrats have one set of bolts holding it all together).

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Datsun 1600/H510 PRC Rally Car - L20B under 2 litre, EFI, 5 speed Hollinger, 5.1 LSD.

Datsun 1600/H510 PRC Rally/Road Car - L20B under 2 litre, downdraft webber, extractors, 5 speed.

Datsun 1600/H510 Clubman Rally Car - Autech SR20 EFI, SR20 "Option 1" copy, 4.8 LSD.


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PostPosted: Sat Nov 08, 2008 2:55 am 
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Well that may be stronger, but still don't see how the bolt's end up in Double Shear ?

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PostPosted: Mon Nov 17, 2008 3:39 pm 
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Just adding to this, I've been following a thread on a US forum where the guys there have been doing their own research into a setup similiar to the wolf creek stuff.

You can actually buy those porsche CV's off ebay US. You can even buy new CV shafts to suit their spline count etc, they are generic ones made for vw buggy's.

A guy on the forum machined up some of the alloy spacers / companion flanges and the guys are in business.

Only issue they have hit is that the CV's they are buying don't have circlip grooves on them, so the cv can work it's way off on the inner shaft eventually.

When our exchange rate against the US dollar was good, these were looking like a good option if we could get the alloy adaptor made locally.

Now those components are probably out of reach for most datsun owners.

I ended up getting some nissan cv's shortened and re-splined. Picked up my S15 manual Helical lsd on the weekend, so just need to find a nice R200 3.9 diff or just the crown wheel and pinion and I'm in business.


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