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johnc

Subaru WRX STi R180 Side Axles

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So I assume you will be selling a pieced together "kit" for those of us having problems snagging a good STi R180?

 

I'm under the impression that this will be a complete new output shaft with mating flange this time. I hope I'm right, cause I'm having trouble finding a pair of STI axles and the few I did find cost toooo damn much.

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I'm under the impression that this will be a complete new output shaft with mating flange this time. I hope I'm right, cause I'm having trouble finding a pair of STI axles and the few I did find cost toooo damn much.

 

If you go back to the first post in this thread:

 

The flange end of the these side shafts will bolt up to the stock 240Z halfshafts.

 

And the $500 is still a guestimate.

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I re-read the original post and that clears things up, a lot. I must have got your web page mixed up with this item (http://www.betamotorsports.com/products/products.php?cat=11).

 

$500.00 is worth it to me to finish this conversion. We were on the track (Buttonwillow) this weekend. Could feel the inside tire spinning coming out of the hairpins (both east and west).

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John, what are your thoughts on how much torque/HP is safe to put through an R180 with stock 240z half shafts that is NOT used for drag racing? In other words, the launches will all be reasonable (no drop clutch at redline, etc) and the car is driven on the street and/or road course? Assume it has a CLSD if that makes a difference.

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I pick up the prototype parts tonight. We used good material, the splines carburized out to 46 Rockwell. Hopefully they fit. After I screwed up the drawing on the first set I'm worried about all the other dimensions - even after triple checking everything.

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I'm crossing my fingers for you.

 

Let me know if you need a tester. We are planning on going to The Streets (Streets of Willow) in February. This will really put the rear-end through it's paces. This will be a driving school run by the Alfa Club (AROSC). No official link yet, just this forum chat.

http://www.alfabb.com/bb/forums/arosc-alfa-romeo-owners-club-southern-california/157940-high-performance-driving-school-feb-27-28-a.html

 

The date and time are correct. All are welcome.

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Got 'em!

 

ProtoType-3.jpg

 

ProtoType-2.jpg

 

Two minor issues:

 

1. The hole for the studs are a bit big so I need to tack weld the styds in place on these prototypes. This will be fixed on the production run.

 

2. The splines were cut about .400" to far into the axle. Again this will be fixed on the production run.

 

The axles are 4340 and heat treated to 46 Rockwell. Should be strong enough for anything put through an R180. The half shafts will got before these.

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Let me know if you need a tester. We are planning on going to The Streets (Streets of Willow) in February.

 

I know I missed your October event. Is February your next planned outing with the car? If so, that's a bit too far for our for testing. I hope to have the production run done by then.

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OMG! They're beautiful!

 

I know I missed your October event. Is February your next planned outing with the car? If so, that's a bit too far for our for testing. I hope to have the production run done by then.

 

That's our plan. There is a January event on the big track (Willow Springs), but we can't afford to go to both. The car is drivable, we can test around town, and up in the hills.

 

Let me know if you need / want our help.

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I have a tester in Alabama that's going to drag race his car a half-a-dozen times through the end of the year and go to one or two autocrosses. He's even got his wife and daughter involved in the testing. The side axles really only deal with torque and shock loads (no lateral loads like the stub axles) so drag race testing is very appealing to me.

 

Thanks for all the volunteers. I'll keep you folks updated on the progress.

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the stock z driveshaft works with the r180 right?

 

I have seen the STI driveshaft and the WRX driveshaft. The WRX and 240z driveshafts will not properly fit the STI R180 LSD. The mating flanges are all similar, yet different. At 100 MPH, I would not trust anything except correctness.

 

I got a quote from http://driveshaftmasters.com/index.html on steel and aluminum, "A steel shaft $340.00 Alu. shaft $500.00". These are made with ALL NEW parts. I have not yet bought anything. Considering that a used STI driveshaft is $200 plus the mods, $340 sounds reasonable.

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I have seen the STI driveshaft and the WRX driveshaft. The WRX and 240z driveshafts will not properly fit the STI R180 LSD. The mating flanges are all similar, yet different. At 100 MPH, I would not trust anything except correctness.

 

I got a quote from http://driveshaftmasters.com/index.html on steel and aluminum, "A steel shaft $340.00 Alu. shaft $500.00". These are made with ALL NEW parts. I have not yet bought anything. Considering that a used STI driveshaft is $200 plus the mods, $340 sounds reasonable.

 

ok, no problem...my local shop only charged me $50 to modify my current driveshaft to work with my r154 supra trans..

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Some installation pictures from the person testing the side axles:

 

ProtoType-4.jpg

 

Comparison.jpg

 

DrvShaftFlange.jpg

WRX STi R180 is on the right.

 

Diff3.jpg

The CLSD inside the STi R180.

 

Installed-1.jpg

Side axles installed.

 

Installed-2.jpg

Notice the front diff mount. Let's see how long that front crossmember lasts now that both wheels get traction... :-)

 

Installed-3.jpg

Old vs. new.

 

Installed-4.jpg

 

Installed-5.jpg

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