im building a motor out of an old 88 turbo and an 87 NA.
i want to use everything from the turbo motor except for the rotors and counterweight which will come from the NA. (hopefully). has anyone seen this done? know why it will/wont work? have any suggestions for me?

what parts are swappable if i need them from the NA engine? (the turbo motor could have damage) can i use the NA rotor housings? front/rear housings? (im sure i cant since they will be setup for the 6-ports, but then again... i suppose i could use the six-ports with them wired open if i really really had to.....


what tools/gasket crap/ whatever will i need for a complete rebuild? (this is my first one)

i will be streetporting it. any tips on porting are appreciated. anyone got a template?

thanks.

 

bumpity

So your building an 88 Turbo II and 87 SE and need to know what parts you can rob from a junkyard?

Rebuild kits are available online. Porting templates are available online as well.

Not sure which sites (ie teamfc3s.org, mazdatrix, corkspot, etc..) but someone should know.

 

So basically, you want to put the NA rotors in the TII housings?

Sure, it can be done...Why you'd want to do it, I don't know. It will be a lot more difficult to tune, and certainly less resistant to detonation...

As far as swapping housings, they are all different. Don't do it.

 

housings arent different. i am putting a TII center housing in my s4 block with s5 rotors. if you take any single piece of advice at all, let it be fuel...... lots of fuel. before you start it you should set up an SAFC and set it as rich as possible and retard your timing.

Justin

 

the side housings in the 13BT blocks have the grooves for the water seals, in the 13B n/a blocks, these grooves are in the rotor housings..................

 

I once heard a rumor that Ari Yallon runs 9.7:1 compression rotors out of an N/A. How he does that with 26psi of boost?..........I would like to know. but what you are talking about is not impossible, a little unusual, but do-able. Anywho, tuning will make or break you my friend, and i would definitely get some 3mm seals. Your low end will be Alot stronger, but in the long run you won't be able to make as much boost. you have a need to either. For all track use, it's really not worth it....IMO But for the street, GOBS of TQ. I know of someone i SA TX that has a 2nd gen with 9.7 rotors, Greddy turbo and I/C. at only 9 psi of boost he makes something like 378 lbs ft of tq. I don't know him that well, that's just what he said. He did mention that it was a complete nightmare to tune it. Good luck let us know how it comes out.

 

So I should have been more specific. The center housing is the same, the outer housings are not.

 

thats cause you dont know ****. 2mm seals are SUPERIOR to 3mm seals, the arguement is dead, its been had over and over again, the last time, all the big guns stated there opinions, all said 2mm seal by far.

 

That Kermit is seriously freaking me out.

 

...You're joking right? If the rotors are good, there is NO reason to get 3mm. Why spend the extra time and money to purchase 3mm apex seals and machine the rotors when 2mm are far more SUPERIOR?

2mm Hurley 2 piece apex seals is what I will be using on my next engine rebuild...not some CRAP 3mm

 

You will need a cell phone, and a second car with a tow bar..

 

BZzztt...Sorry, that is incorrect...
The water seal relocation took place in 1986 and later motors, and in all motors TII and n/a, the water seal was moved to the side housing.....
If you want to build a 6 port with ported exhaust, you use a turbo rotor housing that doesn't have the diffuser plate, and you block the manifold cooling passage...Max

 

i was just wondering if this was true because i am building up a na turbo conversion right now and my na housings are junk nice grove all the way around. So i thought is i could get the turbo housings from an s4 i would already have better exhaust sleeves would they match up to the na plates. i was just wondering if anyone has done this. Also are there any advantages to the na housings over the turbo housings or vise versa. and does it really matter about rear and front housings. or are they interchangable? thanks alot guys

 

somebody have never ripped apart a motor..........................

 

if your talking to me ive never riped apart so if they do line up i was wondering if the 13bt housing are stronger then the na housings

 

just turbo an N/A and/or do more reSEARCH

 

I have a car very similar to yours, now with 3500 miles on the rebuild. I used S4 NA rotors, an S5 mani and turbo with S6 housings with a streetport. While driving around without the turbo hooked up for the break-in I still noticed a solid down-low improvement, even with the porting.

With literally NO tuning and running solid 11 A/F across the board, I dynoed at 225 RWHP and 200 RWTQ on ~6 PSI. My power was climbing still when the turbo ran out of boost (couldn't flow enough to maintain the 6PSI over 6,000rpm :P ) (Just for a reference, on this same dyno an EVO 8 with some exhaust/light intake work put down 198awhp)

I did notice a nice improvement in light throttle cruising too, the car just feels more responsive. If that's from the rotors or not, I couldn't say for sure.

 

Hello 4 year old thread.....

 

Lol

 

i am building a turbo na, and im doing more research. thats why i brought up a 4 year old topic. because i wanted to know if the housing would fit and if there better. Right now i can get a pair of housings for fairly cheap and i was wondering if they would fit and if they do fit would they have any advantages. i plan on putting a 3 window bearing in and rx8 stationary gears if i can get some. i pretty much just wanna know if they'll fit so i can get this show on the road. Also one more question there used to be a really good thread on the na to turbo conversion using the turbo intake manifolds and front cover and not having to use a spacer on the exhaust manifold and cut the frame. the thread is mia i cant find it anywhere but i would like to follow that setup cause i dont really wanna cut my frame i like it how it is...

 

The NA housings will work if you don't have to pass emissions.

I searched for "Turbo intake NA" and got these:
https://www.rx7club.com/forum/showth...t=turbo+intake
https://www.rx7club.com/forum/showth...t=turbo+intake
https://www.rx7club.com/forum/showth...t=turbo+intake

Should answer your questions and more...

 

Just switch the motor out and put in a 383 stroker with a supercharger.

 

cause im not building a drag car. there will be a time and place for that but not in my rx7