I have a 81 RX7, it has the GSLSE brake upgrade up front. This was already done when I bought it.

I am going to order this aerospace brake kit, http://trsmotorsport.com/index.php?p...mart&Itemid=26

But they need to know if it's for a 84-85 or 79-83 RX7.

I'm not exactly sure what's involved with the gslse brake upgrade so I'm not sure which kit to order.

Any help?

 

if its a gsl se front brake set up then its a 84 - 85 the 79 - 83 all had drums on the front i believe and the se had disc brakes on the front so i would go with the 85 set.
hope i helped

 

Drums on the front? I think you mean on the rear.
All First gens had discs up front and drums on the rear AFAIK. The 84 - 85 GSL-SE's had bigger brakes up front with the larger bolt pattern and rear discs.

 

If you have SE brakes on the front, then you need the 84-85 set. When the SE brakes are installed, the spindles are also replaced. There is a difference between the 79-83 and the 84-85 on the spindles and wheel bearings. Spindles have to be changed to use the SE brakes.

Just to clarify what was posted abve, the GSL and GSL-SE models all had rear disc brakes. The SE rotors are larger and vented compared to the non-vented GSL rear rotors.

 

How can I be fore sure, can measure the bolt pattern? Which is which?

 

see if the wheels on the front will bolt on the rear. the gslse has a different bolt pattern.

 

GSL-SE brakes have 4x4.5" lug pattern (4x114.3mm). All other Rx7's from 79-85 have a 4x110mm lug pattern.

GSL-SE brakes are pretty close to 10" in diameter (9.8")

The spindles on ALL 84-85 RX7's are the same - GS, GSL and GSL-SE. The outer wheel bearing is bigger for these years. The rotors for the 12A cars (GS-GSL) are different than the 79-83 models - they are cast to accept the larger outer bearing.

Brake rotors for the GSL-SE are completely different looking than the ones on the GS-GSL models.

The calipers on the GSL-SE are also different and take a different pad than the GS-GSL models.

 

That seems like a high price to pay for a 2 piston setup, doesn't it? I'm thinking you could move up to fd brakes for half that price. www.re-speed.com has a big brake kit, but I haven't really looked into it yet. Just curious as to what made you decide to go with the kit you posted....

Here's the Respeed kit (I went ahead and looked it up). $199.00 but you supply the calipers (which are dirt cheap). That way you end up with fd calipers, which I believe are at least 4 piston units.

http://mrcmfg.com/catalog/product_in...products_id=37


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Pretty sure Billy's kit is for TII brakes, but the same thing applies. You will get bigger brakes using Billy's kit for less money. Just the the kit, some calipers, pads, and rotor/hubs and you'll be set. The TII brakes are larger than that kit (I want to say 11", GSL-SE brakes are already about 10") and are also 4 piston. The new bolt pattern is 5x114.3 (5x4.5 inch), which matches what you are running on your rear, if I remember correctly. You just need a minimum of a 15" rim to clear the TII setup.

 

Man, with your setup, brake selection should be interesting. Since you're running those big meats in the back, you can probably get away with a lot more rear brake than the car was originally designed for. Do you know what the piston diameters are for this kit? Also, what are you running in the rear?

I imagine you're trying to save weight, so I understand the selection. That drag race stuff is kinda foreign to me. Send me the piston dia. & I'll run a few calcs.

 

Pulled up the link. Those are drag racing brakes. Would not be worth a crap on a street car or a car that is to be driven on a road course.

Spendy but if you have a drag car and are looking for the last little bit of speed.....