how much would have to be swapped into a GTUs from my turbo?
are the gear boxes different? are the rear ends different? I know they share the brakes and suspension, but what about the running gear

 

The entire drive line (tranny, drive shaft, diff & half shafts) is different in the GTUs vs. TII.

The TII units are beefier to handle the increased HP and torque.

 

Um, I thought the GTUs had TII running gear. To my understanding, it was a TurboII, minus the turbo.

 

I'm pretty sure the GTUs has the NA drive train. I could be wrong but I based my response on the fact that only the TII's have the ribbed tranny. The TII tranny is not a "bolt in" mod for an NA. You have to replace the entire drive line w/ TII components.

I also based my response on the fact that in SCCA's ITS class you can update any component to another stock component if it was offered in that model at some time. So, you can put an '89 engine in an '86, upgrade from single piston brakes to 4 piston, etc. However, putting the TII drive line into an NA is illegal.

 

be sure you are talking about the GTU or the GTUs. the GTUs' were very rare and did in fact have the same driveline as the TII's.
the regular GTU was basically an n/a with the turbo suspension, brakes, and various interior upgrades.

 

What?

That's new - so there was a GTU S (similar to the 929 vs 929S)?

I know the gear ratios are the same in both GTU, GTU S, and the TII but the drivetrain parts are different.

So we have:

SE 86-88
GXL - 86-92
GTU - 87-92
GTU-S - ?? - ??
TII - 86-92
various Savanna TII converibles - Japan only

Someone want to confirm this?

 

The GTUs has the same transmission as the other n/a cars except it has a close ratio 5th gear.The case to the rear end and the halfshafts are the same as the other n/a cars but it has a Viscous Limited-slip differential and a 4.3 ring &pinion(4.3 rear end).It does have the 16" wheels from the TII and the same suspension as the TII.It also had the four piston front calipers and ventilated rear rotors like the TII and some various other n/a models.So basically to do a TII conversion on a GTUs you have to do the same thing you would for any other n/a car.Engine,wiring harness,ecu,air flow meter,pressure sensor,gearbox,clutch,flywheel and custom driveshaft(though I have heard an automatic driveshaft will work I don't know if it is true)or the rear end and halfshafts from a TII.Hope this answered your question.

 

The GTUs was offered in '89&'90.My above post explains the differences in gear ratios.It was a n/a car with all the good performance stuff but no power windows or locks or cruise control to save weight.Lightest '89 to "91 Rx-7 made.

 

Cool. Was it cheaper than the GXL? That's the only reason I could see they even offered it - to spur sales.

 

I'd guess it probably was but don't know.If someone knows what a GXL cost new in '89 I have the window sticker to my car with the price and all.It says it was $20,822.plus some protection package installed by the dealer that bumped it to $21,617.

 

not all gtus are the same but if you got lucky you got one with 4.30 gears in it give me a tII and a gtu with 4.30 woohoo ill have some fun baby n/a came with 4.10 4.11 same as turbo but turbo had the limtited slip as with some gtus your lucky if you have a 4.3 pick up is better

 

GTUs is cheaper than GXL. GTUs is basically a base model with the bigger suspension and brakes. GXL has the big suspension and brakes already, plus the power options. And as for the topic. GTUs DON'T HAVE THE SAME DRIVETRAIN AS THE T2. T2 uses Type R tranny, GTUs use the base model tranny with different gear ratios. The differential is a NA type equip with a LSD and 4.3 gears, it is a straight bolt on for NA cars, but not for T2 cars.

 

Then, let me correct your understanding...

The GTUs has an NA transmission with a shorter overdrive gear, and an NA limited-slip differential with a lower gear.

Brad

 

Bzzzzzt! That's an incorrect answer, but thanks for playing!

 

You guys are forgetting another big difference. You can mod a GTUs for some very good performance and it'll run almost forever as opposed to blowing up whenever you get on it like a TII.