I just bought a turbo kit for my 85 12a and i was just wondering how much boost can i run in that car safely and i was wondering if anybody had any tips on setting up a intercooler whille still running carb any input is apreciated

 

Has the motor been rebuilt?

 

draw thru or blow thru?

 

I'm assuming it's blow through, since he's talking about running an intercooler. I run 10psi on my rebuilt and ported 12a. I hear that's a pretty good level. Some say 14psi is fine though, but I would suggest you have a rebuilt motor, maybe with some oil modifications, higher psi regulator, higher flow oil pump, and def go over to a air/oil oil cooler since your car came with the beehive oil cooler stock.

 

The simplest answer, until they pop. Then you start over with a fresh motor and learn to tune from there. I've seen psi numbers as high as 28-32, by guys that have been doing boosted rotary for years, and know how to do it.

10-14 psi is generally a decent number, depending on turbo, intercooling and maybe even water/alcohol injection. These numbers should be worked up to, not used as a starting point. 6-8 psi to begin with, then work up from there with tuning.

 

Nice sig, Trochoid!

 

Kinda says FEED ME, doesn't it.

 

Looks like a space ship lol. If i had a race car I would totaly race it like that.... the other stuff is just extra weight lol.

 

FYI thats the avatar, not the sig. it reminds me of a bug

 

it needs to be feed a 20b to be satisfyed

 

Just out of curiousity, for those of you with a boosted 12A how much power do you see? Is it comparable to a 13B, sorry for the thread-jack.... J/W...

 

wouldnt more than 10psi on a carb be hard on it? i was also toying with the idea of instead of doing my t2 engine swap, just building my 12a and throwing a turbo on it. not tryin to thread hijack, but what all would need to be done? already have a mikuni carb, and plan on rebuilding and porting the 12a. gotta have a car hat and manifold and turbo of course... so what else?

 

21psi is the max a 12a can take...im not going it say it will take it for very long but it can handle 21psi...that is the max with a very good tune

 

On what basis can you make a blanket statement like that? There are way too many variables... type of fuel, size of turbo, intercooler efficiency, quality of the tune, etc.

 

a bone stock 12a can run up to 12 safely on 93 octane fuel.. i do know guys that run up to 18 with stock s4 or s5 turbos but its not safe

 

the question was "how much boost can a stock 12a handle" and i know of ppl that have run 21psi. zac(FBII) on his old set up had run 21psi a few times but it never blew when he was runing that much boost... but the motor will not last a long time

i know a rotary building in FL that told me the same thing. He didint say how long it would last but he did say it could handle it..than i had 1st hand of 21psi with zac's car hitting 21psi....

that is what i basis my statement on..

 

no it has a lot of miles but i picked up a turbo for 100 bucks and the entire kit is in good shape i just didnt know about the boost capacity of the 12a its got nothing done to it but what could i do to make this better

 

21psi with one turbo will be totally different to 21psi on another turbo. A stock TII will be well out of it's efficiency range at that point so it will be heating the air up a lot which also increases the chance of detonation. Whereas a larger turbo designed to run at that sort of pressure ratio will put less thermal stress on the engine.

The point I'm making is, you can't say a certain engine will handle x ammount of boost pressure because it depends on the exact setup.