Trevor Dunn

I have an '83 GSL and was curious if the GSL-SE rear brake rotors would fit properly on a GSL axle, if the 4x110 axle was drilled and studded for 4x114.3. Not sure if the hub bore diameters are different or if there was something else that would prevent this.

My thought was to do a GSL-SE front conversion to have 4x114.3, and then just drill and stud the axle shafts for it as well, and then be able to run OE GSL-SE rotors all the way around. Will GSL brake calipers work with -SE rotors?

Maybe I just need to cough up for a complete GSL-SE rear end if I want all that, but hoping there's a cheaper route since eventually I plan on doing a 8.8 in the rear..

KansasCityREPU

iTrader: (9)

The 1983 front strut spindles are small. The GSL-SE fronts will only fit the 1984/1985 front spindles.

For the rear, the 110mm dust shield to too small. Also, 110mm caliper wont work with the GSL-SE rotor.

Trevor Dunn

Thanks for the info, guess I'll hold out until I do the 8.8 for the rear

82transam

iTrader: (18)

People have re-drilled the 4x110 axles for 4x114.3 pattern before and (probably) not died, but the overall diameter of the hub area is smaller than the SE axles, and the new holes for the 4x114.3 pattern get pretty close to the edge - not much material to hold the new studs in. Not recommended...

mustanghammer

iTrader: (3)

The GSL Moser axles I have were originally drilled with the 4x114.3 pattern and it looked sketchy as hell. I eventually had them drilled to a 4x100mm pattern so I take advantage of lighter and cheaper wheels.

The issue with GSL axles is that they do not incorporate a center hub for centering the wheel. Instead, the brake rotors/drums provide that. So fitting a GSL/SE rotor means that a centering hub needs to be added to the GSL axle. I had that done on my Moser axles. The axles were machined to accept a press fit aluminum hub to center the Turbo II rotors I ended up using.

Go Here: https://www.rx7club.com/build-thread...-992966/page4/
Start with Post #86 to see what GSL axles look like when they are drilled to a 4x114.3 pattern and the center hub that we made for my axles

peejay

The LARGEST issue is that the distance from the bearing to the face on the axle is 15mm larger on GSL-SE axles, so the brake rotors have a 15mm deeper hat. You could probably have spacers machined to take up that distance, which would also be able to account for the different piloting strategies, but at that point it may be simpler to just have new axles made.

And then you have to try to find GSL-SE calipers, which are completely unobtainable, front and rear. Which is why I built a rearend to take something less weird than something only ever used for two years on a rare trim level forty years ago.

If I were to choose my own bolt pattern, it would be 4x100 or 4x4.25, because it is easier to find wheels in those patterns, unless you specifically want wheels in an old Nissan fitment or want to use GSL-SE wheels.

82transam

iTrader: (18)

^ Great point about the offset. Also agree, building anything around the GSL-SE parts (besides a restoration of an actual GSL-SE) is probably not wise anymore due to the parts (un)availability. Unless of course you (me) stocked up on all that a decade ago before it all vanished... I probably should just sell it all given how expensive all this crap has become and upgrade to brakes off something newer...

rotaryengineering

I am trying to do something very similar to your post. I have a 1985 GS that I am trying to put some Panasports that are 4 X 114 bolt pattern. I did reach out to Atkins Rotary to try and purchase GSL-SE front rotors that should be a direct swap just with the bolt pattern I want instead of the 4 X 110. The re-drilling of the rear stock axles should not be too bad. I found some spacers on Ebay that bolt up to my GS axles and provide the GSL-SE bolt pattern. My plan was to use my press to remove the studs that shipped with the spacers and use the spacer as guide to re-drill the correct pattern I need. Then use transfer punches to mark and drill the correct pattern I need on my axles.
Here are the parts I was planning to purchase to start my adventure.
Ebay wheel spacers
https://www.ebay.com/itm/222510253638

Atkins Rotary front GSL-SE rotors
https://www.atkinsrotary.com/Brake-S...s-tab-comments

Harbor Freight
https://www.harborfreight.com/28-pie...sfer+punch+set

peejay

GSL-SE rotors need GSL-SE calipers. The rears are vented and the fronts are different, and spaced further out, since the -SE rotors are an inch larger in diameter.

Good luck finding GSL-SE calipers, front or rear.

You are better off just using the adaptors, since the GSL-SE parts are built around different offset wheels. The hub faces are 15mm further out per side.

kurtf

iTrader: (3)

I have three SE front calipers, two that I used for a few seasons on my EP car. Removed last year when rule change allowed big brake kits. I was keeping them just in case. But if someone really needs them feel free to PM me. Cant help with the rears. Also have the backing plates that were modified for air duct.