ok i have a 87 t2 , PRoblem its interior is FInished its basically a skeleton inside besides the seats an dash , the engine is inop as of now , and its been sittin outside for a while so it needs brakes rotors , exhaust ETC.!!!!!! now today i saw a what i thought to be a T2 but turns out to be a 89 gtu with a t2 hood , the guy explained he has a s4 n/a engine, the intirior was Spotless neat an FUlly factory , he had rims an seemed to be new exhaust , it looked and sounded BEAUTIFUL , ..........now i live in a neighborhood with an association in other words i cant work on cars in my neighboorhood i do it anyways but secretly , an the 87 t2 i have will Take ALOT of $$$$ and alot of time ........... problem is i aint got neither Time and $$$ to spend , the guy wants 2,500 for the gtu , truthfully i feel weird faking to have a t2 lol , an another is SHould i make the switch??? sell the 87 T2 an buy the 89 gtu???? i mean it does Run , or should i keep focused on Fixing up my 87 t2......................................I dont know what to do......ohhh ya i dont worry about the engine because i have 1 t2 engine and 1 3rd gen engine , so if i "were" to buy the gtu i could at least turn the engine into a t2

 

Go for it...Why do guys always want other people to make decisions for them, lol...

Hurry up & do it before that hurricane hits ya

 

lol i know i just need opinion.................like whats the difference between the t2 an a gtu?? besides the turbo engine? is there a differ differential setup possy? or lsd ? or is it just plain out just the turbo? because if its just the turbo heck ill buy the gtu an make it look like a t2 lol , but if theres more to the t2 then the gtu ill do some swaping before i buy

 

Its a S5 GTU meaning its better looking. Also the rear gears are the same except the GTU will have a viscous lsd which in my opinion is much better. I'd take a S5 over any S4 TII any day IMO.

 

and i'll take an S4 over an S5 ANY day... IMO

 

if you did a T2 switch with a GTU (which is a 13B DEI if im not mistaken) you will have to buy a new tranny i believe and t he wiring for the engines differ, so the mechanic or you will have to do alot of figuring out about wut wire goes were and so fourth, i my seld have a GXL and the 13B DEI injection and i think in a few years ill do the T2 swap, when i have the money to waste, but it would be cheaper to just buy another T2 or just fix yours up.

 

also i fergot the rotors are also smaller on the N/A DEI than it is on the T2 DEW, and if you were to just add T2 to your DEI, your engine will blow most definitly, i say go with a T2. because the N/A doesnt have as much HP as the T2, no were near the T2 at peak performance.

 

You can use the N/A transmission as long as you use a N/A flywheel.

 

The S5 GTU will only have an open diff, not any sort of LSD.

The only non turbo 89-91 that came with a LSD was the GTUs (note the small "s". Not the cheapo base strippy model that the S5 GTU was.

 

I was unaware of that. I thought that all 2nd gens with the exception of the SE came with some sort of LSD. My '89 GXL has a LSD. I'm pretty sure of it because I pulled it apart.

 

???huh what are you talking about??? engine rotors or brake rotors???

The T2 is an FC model that came with a 13BT.

...maybe you need to read the FAQ for FC for the abbreviations.

 

No, your 89 GXL did not come with a LSD either...And if you pulled it apart, did you see a sealed diff, or an open diff where you could see internal gears???

Again the only S5 models that came with a LSD were the GTUs, and the Turbo...

Not the GTU, not the GXL, not the vert, not the 91 coupe...

and as far as the S4 models only the 86-88 GXL, the 88 GTU, and the Turbo came with a LSD...

Not the base, not the luxury coupe, not the SE, not the sport, not the vert.

Of course this is again covered in the FAQ for FC and Options and standard features threads at the top of this section.

 

See this is confusing. Were the hell did you get this info. I've already asked all these questions and you are the only one whos said other wise. (Not to doubt your knowledge. Just you're the only person who's told me different.)

 

Who told you otherwise???

Half the answers already posted in this thread before I got involved are clueless to start with...

This LSD thing is covered countless times over and over and over and over...

And the S5 GTU is the strippy base model... it is nothing more (and slightly less) than a 88 SE with 5 lug wheels (but still the lame single piston brakes). In fact in most other countries, the 89-90 GTU was called the SE or GX...

 

i was at an Apex shop and the mechanic there told me that the engine rotors are a bit smaller than the 13B-REW rotors so if you applied T2's to the 13B-DEI it would blow.
(This is just to my understanding of what the mechanic told me, it is what made me not want to buy a 13B-REW T2)

 

Thats odd. A buddy of mine who's built and raced RX-7's for years (Has the fastest in the state) told me otherwise. Also every 2nd gen excluding the SE I've seen had 4 piston fronts including the '90 GTU I just bought.

 

oops i meant the 13BT, sorry.

 

Someone was smoking crack (sidebar=why is there so much crack smoking in this thread???)

The 13BREW Rotors are almost identical to the S5 13BT rotors, and would have no influence on an Engine "blow"ing.

Either way, the 84 and later 13B rotors are all pretty much interchangable depending on what you want to do with the engine. They are not any smaller or bigger. Heck RB was running Renisis rotors in place of S5 13B engine rotors with no appreciable difference.

Now compression varies based on rotor application... but that just means on turbo motors, the boost levels must be more closely controlled. Turbo rotors on a non turbo engine will generally only result in lower HP levels (as the compression is lower), and not blown motors.

 

Ah okay... sure... Your buddy ??? I don't think I would call anyone who lied to me my buddy, if I were you.

90 GTU models came with single piston front brakes with 5 lug wheels.

Perhaps he is confusing the 89-90 GTU with a GTUs??

or an 88 GTU???

The 88 GTU and 89-90 GTUs came with 4 piston front brakes and a LSD.

Go read the options and standard features thread... you can see what Mazda really built.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/specifications-what-did-2nd-generation-rx-7-come-w-options-standard-features-249616/

Here is the 90 models:




Funny the only one with a LSD is the Turbo, and the only ones with 4 piston front brakes are every model but the 90 GTU...

heck the 89-90 GTU was even so base model that it only came with HR rated tires

 

I can barely read it but seeing as how you somehow had it handy I'll believe you. But I'm not shittin you the '90 GTU I just bought has 4 piston fronts. Thats why I had a hard time believing you. And why the hell would mazda discontinue LSD's in their S5's. Just doesn't make sense. Anyways it doesn't matter I'm replacing the diff anyways. And it could be very possible my GTU had 4 piston fronts installed by the old lady I bought it from.

 

The likelyhood of an old lady installing better brakes is pretty minimal.

Much more likely: you had a much desired, and very rare 90 GTUs model which did come with 4 piston front brakes and vented rear brakes and a viscous LSD and you did not know it.

 

lol well what i meant by swapping it to a t2 is not just rotors in the engine i meant Installing My spare t2 engine in it , i have all the t2 wiring an necessary stuff , Lol ok so to my understanding from what you guys posted....... im lookin at a 89 gtu thats an S5? and lsd? correct me if im wrong . lol it got a bit confusing with the brake rotor subject an wheel lugs lol ........... but ya i dont plan on puttin just t2 rotors in a n/a engine i plan on Just droppin in a 13bt in it and i have the t2 tranny ................ let me know lol , i love opinions

 

see i would love to keep the 87 t2 but it **NEEDS** heres the list - brake rotors , caliper rebuild , a wheel lock nut kit ( the locks didnt come with car) new interior EVERYTHing except dash , warning light thing in dash is cracked , new paint job , new rims ( mine are chewed up on sidewall) ENGINE bay is a wreck ...............add all that up cashwise .........thats the only reason im teeder toddering between the gtu , an in orlando fl , its SUper hard to find a t2 thats under 3,000 and running fine . so ya

 

No it does not have LSD, yes it is an S5.


Ah... there are 4 lug and 5 lug wheels, and single piston front brakes and 4 piston front brakes... 5 lug wheels were available in either single piston or 4 piston brake caliper versions, but with the 4 lug wheels there were only single piston brake calipers.

It is best to use a R-type (turbo) tranny when using a 13BT engine.

 

Gtu's come six port right?