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S3 rx7 diff. Stronger axles?

Any type of technical questions or info

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S3 rx7 diff. Stronger axles?

#1 Post by WANKfactor » Mon Jun 12, 2017 3:01 pm

Anything on the aftermarket for stronger axles?
Im running a guru torsen, so now the only weak points are... everything else. Im thinking if im going to rebuild the diff i might as well try and upgrade as much of it as possible, along with reinforcing the whole housing.


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Re: S3 rx7 diff. Stronger axles?

#2 Post by Eeyore » Mon Jun 12, 2017 4:39 pm

You can buy side gears for the LSD centre to suit 28 spline axels (probably BW78 style). Try MSF Racing Components for those.

Also Moser in the US made axels to suit the GSL and GSL/LE which I believe are a S3? I actually don't know enough about those US spec cars to comment.


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Re: S3 rx7 diff. Stronger axles?

#3 Post by KYPREO » Mon Jun 12, 2017 4:45 pm

Yes Moser made/makes stronger axles which were sold by ReSpeed back in the day. I think Adsy got a pair.

Didn't Modena/Guru used to do billet axles to suit s3? Maybe to suit the 28 spline gears.


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Re: S3 rx7 diff. Stronger axles?

#4 Post by spunbearing » Mon Jun 12, 2017 7:02 pm

From memory you can use VN Commodore Axels (left one I think is the same length) in a series 3 housing and change the LSD gears to match. The VN bearing fits. Obviously the pcd changes.



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Re: S3 rx7 diff. Stronger axles?

#5 Post by 20b » Tue Jun 13, 2017 12:57 pm

Anyone actually got the 28 spline gears from msf? I know they're listed on his website, but have heard about some supply issues from msf.



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Re: S3 rx7 diff. Stronger axles?

#6 Post by WANKfactor » Tue Jun 13, 2017 5:47 pm

Thanks guys. looks like ive got tomorrow off so will call MSF and pick their brains on options for strengthening an s3 diff or building a hilux diff. Anyone else I should be talking to?


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Re: S3 rx7 diff. Stronger axles?

#7 Post by nvspasngr » Tue Jun 13, 2017 7:39 pm

Going by your other post re the Crown wheel and pinion and putting 436HP through them I wouldn't waste your time trying to strengthen the axles and crown wheel.

If you get better axles the crown wheel and pinion will be the next weak link. I always ask people what they want to do with the car when they ask about LSD's and with that much HP I would suggest you not waste your time and just build a stronger Borg Warner or Hilux. Race car guys I have dealt with can break crown wheel and pinions when they get to around 250 - 300HP and slightly do something wrong, ie put a wheel on the grass and then be at full revs when getting back on track etc. With the amount of power you have and if you want to have fun with that power I would just get a stronger diff to start with.


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Re: S3 rx7 diff. Stronger axles?

#8 Post by WANKfactor » Tue Jun 13, 2017 8:33 pm

Cheers mate. Could you build me a diff, or could you recommend someone?


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Re: S3 rx7 diff. Stronger axles?

#9 Post by nvspasngr » Wed Jun 14, 2017 7:03 am

I dont do Hilux's or any other diffs sorry, Just the basic Mazda Medium diffs and Nissan H190 diffs which again wouldn't hold that power or torque either.


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Re: S3 rx7 diff. Stronger axles?

#10 Post by WANKfactor » Wed Jun 14, 2017 10:14 am

Ok fair enough. Just called Diff King in Dandenong - he's talking billet axles and some kind of black magic with something called the collapsible sleeve but says the crown and pinion will be fine with this mod. Im in the process of pulling the diff out now and taking it up there so he can have a look. Does this sound ok? He reckons he's done a few of these diffs and the pricing is very good.
I left a voicemail with MSF but havnt heard back from them yet.


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Re: S3 rx7 diff. Stronger axles?

#11 Post by 20b » Wed Jun 14, 2017 12:47 pm

I'm guessing they replace the collapsible sleeve with a solid spacer.

http://www.weirperformance.com/solidpin ... rkits.html



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Re: S3 rx7 diff. Stronger axles?

#12 Post by KYPREO » Wed Jun 14, 2017 1:26 pm

Very interesting, thanks 20b

For a $55 part something definitely worth considering (if it works). I'm staying tuned..


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Re: S3 rx7 diff. Stronger axles?

#13 Post by WANKfactor » Wed Jun 14, 2017 1:54 pm

20b wrote:I'm guessing they replace the collapsible sleeve with a solid spacer.

http://www.weirperformance.com/solidpin ... rkits.html
Thanks for that. Makes sense now. So the theory is the extra torque is crushing the collapsible sleeve and ruining the mesh setting?


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Re: S3 rx7 diff. Stronger axles?

#14 Post by rotorhead15 » Wed Jun 14, 2017 9:14 pm

20b wrote:Anyone actually got the 28 spline gears from msf? I know they're listed on his website, but have heard about some supply issues from msf.
Hes very slow but I think hes a 1 man outfit? I ordered some stuff through him a while ago, forgot I ordered it completely, then they turned up randomly a few months later. I think its been a similar story for most people who have dealt with MSF, the stuff does turn up just takes a while.



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Re: S3 rx7 diff. Stronger axles?

#15 Post by WANKfactor » Fri Jun 16, 2017 12:07 pm

Ok went down there and he hasnt opened the diff yet which is good as nvspasngr (source of invaluable info) has (very kindly) been filing my head with all sorts of ideas (thanks mate 8) ) about how if im going to spend money on a diff whos ring and pinion ... and tailshaft yoke (or uni) btw.. will be the weak point, i should just spend a bit more on something that is stronger and i tend to agree.
So iv asked George and Sashi down at Diff King about other options.
Build s3 diff as described; $2500, keeps my guru torsen, and a weak point at the diff gears and the uni that end of the tailshaft.
Hilux diff;$4000, best choice of diff ratios and lsd types.
Borg warner; $3500 parts are cheaper and easier to find, limited to no shorter than 4.11 (which is the ratio i want anyway, but would be nice to know i could go shorter) and no torsen option. They want me to use a locker, but I thought they are only good for drag racing and off-roading? This cars main intention is for street cruising and track days.
Any opinions on which way i should go?


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