I know that on the 13BT motors in FCs, the compression is lower than on N/As. What about you 12AT guys? Are there lower compression rotors for the 12A? For those of you that have gone the turbo route with your 12A, whether it's a blow-through kit from RotaryShack or something you did yourself, how exactly did you do it?

 

I can't really say much for what some people do, but unless you get the J-Spec 12AT from rotaryshack, it would be VERY hard to find lower compression rotors. The compression on the 12A is not high enough to present problems untill you start hitting 14 psi. If you run a good intercooler and high octane gas, you shouldn't run into any problems with the stock compression rotors.

 

We've got a 12A for sale with really low compression


Sounds like just what you're looking for.

 

Cool. So, all I need is a turbo prepped carb, carb hat, intercooler, manifold, and turbo. Simple.

 

fuel pump, rrfpr

 

oil lines, clearance of manifold to whatever intake you decide to use, downpipe, custom exhaust (racing beat will be waaaaay too restrictive), possibly new fuel lines (definately a bigger return line), locked distributor, msd box would really help as well... trust me, and lots of spark plugs

 

What the hell is a locked distributor?

And, if I'm running a smallish turbo (like a stock FC turbo) and low boost (8-9 pounds), I'm sure my RB exhaust can handle it. Hell, I got the long primary streetport system, that better frickin' handle it. Take off the headers, custom make a downpipe, all set.

 

Locked distributor means disabling the mechanical and vacuum advance, and setting the timing to a more advanced setting.
Another option is to just disable the vacuum advance, and using less initial timing, relying totally on the mechanical advance.
The vacuum advance is not usable with a turbo, due to the boost pressure inside the manifold, therefore, no vacuum.

 

Ahh. That makes sense, I guess... I didn't realize there was either. I don't know nearly enough about that subject.

 

Sure it is. There is still vacuum at idle and part throttle situations. Even the pots on a 12AT dizzy do both advance as well as retard.

As you said, it is better to remove it though.

 

i saw low compression rotors from a 12at in japan for cheap on ebay, inspected and everything

 

yeah can i get more info on this locked dizzy

 

these images are courtesy of "SEANROT" on this forum. he also explains it in the thread i got the pics from.

https://www.rx7club.com/showthread.p...t=locked+dizzy








if you need more info, hit the search button and type "locked dizzy"

 

OH and $100T2: that RB system will work ok..... for noise reduction. but if you want that turbo to spool up quick and not to be hindered of atleast 40rwhp... i say sell that exhaust and run ATLEAAAAAST a straight 2.5", but i'm running a 3" and it's working wonders. the problem with the RB system (sp or not) is the pipes are 2" diameter and i don't think that's inner. even if it does splilt off and ****.. doesn't matter anymore because you're not running exhuast out of the header anymore, so you dont' need to seperate any pulses. that's just gonna make the exhaust cool off and slow down which = less power because it's harder to push the gasses out. the turbo needs as little restriction as possible (to an extent, 4" is not neccessary). you already have one restriction; the turbo itself. hell two restrictions if you are gonna run the stock TII manifold which slams all the gasses in to each other right as they exit the motor. sooo, out of the turbo the gas flow nicely thru a downpipe, then get split up in to two smaller pipes, then re-collect before the axle in to one semi-larger pipe again only to go thru a nice quiet restrictive muffler.... you might as well just slap nitrous on your car and forget the turbo setup all together. if your gonna go, go all out.

 

So I had a very bizarre idea.

What's the smallest turbo I can get?

 

So I can use a stock T2 manifold on a 12a for a turbo???

BTW, your signature says something about an updated website... What site are you talking about? I see no clickable links. If it's a site about your car, post that ****, I wanna check it out.

 

i wouldn't go any smaller. the fc turbo is very well sized. run the rb system, i'm just saying don't expect much. it will probably make full boost around 4500 - 5000rpms. and if you really truly only want to rund around 8 - 9psi which i know will equate in reality to around 10psi then stick with your plan. i apologize for sounding like i'm bashing, but i thought you wanted some power. i misunderstood. it will definately sound awesome tho.



edit: click on my screen name and go to "visit fb II's website" or something like that.

 

I'm thinking two smaller than FC turbos, then I can run one into each side of my RB exhaust.

 

no
go with the setup fb2 mentioned

 

Well, I guess I can always sell my exhaust to some lucky forum member when the time comes. I want to pick up a second 12A and rebuild/streetport it. For now, the motor in there will do. It looks like I'm going to have to have surgery on my hand now, so I just need to finish up the **** I am already in the middle of.

 

So is that a "yes" that I can run a 13B turbo manifold on a 12A?

 

I dont think you can run a TII manifold, isnt it too wide?

I thought that was the main difference between the 13B and the 12A, the rotors were different widths. I mean, I guess it wouldnt matter if the center housing was larger than a 13b's though.

 

trust me... i already mapped out and actually had someone ready to make a manifold for running two turbos.. after more thought.... it truly isn't worth it. it will create soooo much heat (which you will learn to hate when you slap a hair dryer in there), and not only that but is hard to fit in there and the stock 12a motor just doesnt have big enough ports to supply that much exhaust to push two individual turbos. probably wouldn't spool up as fast as you would like. especially running that rb system. i'm tellin ya, keep it simple and easy. modify the stock TII exhaust manifold to fit your 12a, create a downpipe (2.5" or so) that mates up with your RB system and go from there. the gains over what you are running now will make you happy. upgrade as needed.

oh and use the stock nikki carb, robert@mexicoshack can help you out there cheap and a damn good base to start with WOOOOOT!

 

No, but it can be made to fit. You can either oval the holes out or chop the ears off and weld a 12A flange on to it.

 

it isn't too bad making a tii manifold fit the 12a... hell i even ran a 13b header on my 12a for a while. hope you like grinding tho woooohooooooo! i smell mexico w/ a side of cheese in the air!