GTUs
 

I had a friend of mine tell me that the GTUs had a TII drive train except for the motor i have had two sevens a turbo and currently a non turbo that im working on swapping to turbo. What I need to know is if the GTUs is actually carrying the turbo rear i need one badly and i kinda need a turbo clutch slave so if they have those let me know if not thanks anyway.

The GTUs came with turbo suspension and brakes, that is all. No TII tranny, no TII driveshaft and no TII rear end.

^ Are you sure about that? So the only difference b/w a GXL and a TII would be the stiffer springs and sway bars? I could've sworn the GTUs came with the shorter TII trans, LSD and shorter final drive.

The FC sticky at the top of the 2nd gen. section has this info (models and specs.).

Both the GXL and GTUs have NA drivetrain.

Pretty sure the rear end is the same minus the fact that the RP is 4.30 instead of the T2 4.10

/thread

The GTUs came with the standard non turbo Clutch, tranny, slave cyl, drive shaft, rear end, half shalfts, and 7 inch differential (turbos, FD's and FE's use a 8 inch).

The only thing the least bit different than any other S5 non turbo, is that it came with the 4.3 rear end gear, and Viscus LSD and the Turbo's wheels and didn't have a factory sunroof.

It also came with the same 4 piston vented front brakes and single piston vented rear brakes that the GXL, the Sport, the 88 GTU, the convertible and the Turbo came with.

The GTUs suspension was also the same as any other S5 non turbo with the plastic end links and standard non turbo springs.

This is where I always get confused on any GTUs discussion. The sales brochure does not indicate differences in the transmission or suspension. But, the parts manual suggests a different 5th gear and suspension for non turbo, which I assume is a GTUs. Which is correct or am I misreading?

Turbos and non turbos use different trannys and have a different top gear (5th gear). The S5 hard suspension was only found on verts. Either way, you will notice that the R type tranny (as found on the Turbo models) does not share anything with the non turbos, including the GTUs model. BTW, with Mazda's part numbering, a part number with a A or B or C on the end of it, means that it is a revision of the original part number.


Yeah, all the coupes used the same suspension on the S5 models except the Turbos and with the turbo it was only the front springs that as I recall were different due to the extra 150 lbs of the engine and tranny and accessories.

Interesting, I didn't know that about the suspension.

yeah, gtus in the parts books is "hard suspension"

if you look at the s5 suspension, they are all the same except for one thing, like rear shocks or something thats bad anyways cause its got 100,000miles on it

Thanks for the clarification. Just let me make sure I understand. The hard suspension referenced in the parts manual refers to the S5 convertible. So, the part number having the "A" suffix is a part revision for the convertible. This would seem to make sense as the the 1988 convertible is stated as having a 0.771 5th gear and the 1989 convertible is stated as having a 0.697 5th gear. So, I 'm assumng the "A" suffix reflects the 1988 to 1989 convertible 5th gear ratio change. Is this reasonabely close?

If the preceding is correct, than the GTUs having a different transmission (5th gear) and suspension is a myth?

ok.. so the 8 GTU has the same brake calipers as the s5? then would that mean i could just swap out my 4 lug hubs to the 5 lug hubs with no problem? or am i still forced to swap the calipers out?

What does the "hard" suspension consist of? I'm about to go get me some sway bars if thats included.

Hard suspension in the parts books refers to 5 lug 4 piston brakes as originally found on the S4 Sport.

If you go into any Napa or Kragen or Autozone and ask for brake pads for a FC, they will ask for hard or standard suspension... of course the suspension has nothing to do with the brakes, but for some reason the 5 lug, 4 piston front brakes are linked to the name hard suspension.

Yes. That is why the speedo gear is different on the GTUs.

And you will notice that the 88 vert had the same M50 tranny found in all S5 non turbos, yet the 88 vert (as everyone knows) was a S4 model.


The 88 GTU should not be confused with the base model in 89 called the GTU. The 88 GTU was the replacement for the 86-87 Sport and what the 89-90 GTUs model was created from.

The 88 GTU has the same 4 piston front brake calipers and vented rear brake rotors as the 86-87 Sport, 86-90 GXL, 88-92 Vert, the 89-90 GTUs model, and the 87-91 Turbo.

The S5 GTU (89-90) was the strippy base model with 5 lug versions of the old Base/Luxury/SE model that came with the single piston front brakes with solid rear brake rotors. So, I am not sure what you are thinking about using 5 lug hubs that even be remotely linked to the 88 GTU model.

On a S5 coupe to get hard suspension, you would use the vert's rear springs and stabilizer bar and stabilizer bar links.

Come on guys.. this is all covered in the sticky threads at the top of this page... I am not getting why you guys think that this is new or special info.

I haz a 90 GTUs...a black one! :D

I thought the GTUs had the same tranny, just came with a 4.3 Final Drive?

That would be correct, it came with the same non turbo tranny that all the other non turbo S5 coupes came with

mazda refers to hard and soft suspension in the transmission section of the fische. in the suspension section they use turbo, limited slip, and non limited slip.

if you're looking at a non mazda book, who knows how they are going to list it.