Hey guy, i am wondering what is needed for a non ABS GTU single piston front caliper, solid rear to convert to TII brake front 4 Piston and vented rear? (Beside the caliper). If anyone has exp with this kind of conversion please tell me how. Thanks.

 

1. GTU has the TII brakes already.
2. SEARCH, TII brake conversion has been covered time and time again.

https://www.rx7club.com/showthread.p...ighlight=5+lug

 

He might be talking about an S5 GTU which is the base model.

where have you searched freakman?

 

i thought you were calling names but that's his real user name.

 

woah, uh, sorry bud, but the gtu does not have the t2 brakes. god damn.
if you payed attention in preschool, you would be able to tell apart shapes.
look at the rotors, the t2 are vented, the gtu isnt.
the t2 front brakes are 4 puck, the gtu has single puck.
as far as i can see, the only difference in the rear brakes is the t2 has a slightly larger rear caliper to make room for the vented disc.
man, pay attention........

peace

 

Some haven't learned yet, RX7 exhaust can kill brain cells, as seen in the above post.



If I put on 16" vented Turbo wheels on my 88 GTU does that mean I get vented brake lines??

 

No.

Before insulting people, you should check your facts.

 

At the front all you need is the caliper.
In a perfect world- i.e., one in which you have lots of cash- you'd also replace the booster and master cylinder.

The rear swap requires a vented rotor and the correspondingly wider caliper.

If yours is a street car, just the front caliper swap will net you 90% of the improvement at a fraction of the total package's price.

In fact, if it's a street car (and assuming that the rotors/calipers, etc. are in good shape), fresh fluid and good pads will suffice.

 

lol @ farberio for making an easy mistake.....

double lol @ magus2222 for making that same mistake while insulting farberio.

 

S5 GTU is a base model??
It makes no sense!!!

So...if you have an S5...
GTU Rotors are 9.8" vented Fronts
TII Rotors are 10.9" Vented Fronts

GTU is 10.3" Solid Rear
TII is 10.7" Vented Rear

 

I have an S5 GTU. I have single piston front calipers and non vented rear rotors. 'Nuff said.


As far as the swap goes, you need the front and rear calipers, the hard lines (unless you have TII steel braided lines), rear vented rotors... and I think that's about it. You could also change out the brake booster and master cylinder, but that's unnecessary. All you'd really need are the front calipers, don't worry about the other stuff.

 

On an S5, you need calipers and pads (and pad hardware). Everything else will bolt up.

Also, ALL S5's have the 10-inch rotors because they replaced the 9-inch rotors with 10 inch ones. (unless they're still on the stock rotors, which isn't very likely)

OTOH, if they're worn down, you might as well get some new front rotors, since they're only like $30 a piece at auto parts stores.

You should ideally also get some new brake lines, since they really only have a replacement interval of about 80,000 miles... single-piston lines will work on the four-pot brakes.

The rear brakes really aren't a big deal... so I wouldn't bother replacing them unless you MUST have vented rears (which just add weight).

 

It did in 88. I had an 88 GTU... they have T2 brakes, suspension, spoilers, T2 interior (w/o power anything except mirrors and optional sunroof) and a nonturbo LSD.

 

The S4 GTU is a sports model, while the S5 GTU is the base model.

The S5 GTUs is the NA sports version.

 

Yup, and the FAQ for reference.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/specifications-what-did-2nd-generation-rx-7-come-w-options-standard-features-642372/

 

ALL the NA's got the smaller MC and single diaphragm booster, even if they got the 4 pot brakes. Brake feel is just fine with the smaller MC, especially if you use an MC brace to reduce firewall flex.

 

OTOH, I wonder why the four-piston brakes had the hard lines.

I wonder if it's because of the increased pressures on the lines compared to single piston brakes? (longer soft hose = more tendency to expand, so shortening them means they expand less)

Of course, if you have teflon hoses it's probably a non-issue... but stock rubber lines with 150,000+ miles are a different story.

 

I have a question. I took my chances on a real POS '91 TII, that I knew had a bad motor, to get all the goodies to swap into my '89 GTU.

Would it be worth swapping the MC and brake booster too? Well, buy rebuilt MC or rebuild mine. What are the chances of this going bad? Especially if it is from a junk car that's been in the weather.

It has ABS. Would that matter?

 

^ yea i want to know if the abs off of the TII MC will matter on the GTU Too.


Anyone?

Thanks

 

+1 and the TII should of still got a different distributer block IIRC from RG

 

The FSM doesn't list any differences in the proportionning valve between TII and NA.

The reason the single piston brakes need the longer flex line and the 4 pot can have a hardline is because the single piston caliper slides and the 4 pot is always in the same place. I don't think there's any pressure differences. A shorter flex line will reduce the amount of flex in the system making for a potentially stiffer pedal feel.