Thinking about porting and turbo
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Thinking about porting and turbo
Thinking about doing a large streetport on my 12a and then putting a turbo on it.
How would I go about sizing the turbo and would I be able to setup a blow-through using my PHH44 or would I need to go bigger?
How would I go about sizing the turbo and would I be able to setup a blow-through using my PHH44 or would I need to go bigger?
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anyway, you'd need to set some goals when you go about sizing the turbo. spool ease? overall power? etc.
one of the beauties of turbocharging is the fact that you are FORCING air into the engine, so throttle size doesn't matter so much. your Mikuni may actually be an asset for off-boost driving. could you find a bigger or better carburetor? sure, but (at least in MY opinion) you can make that decision after you have everything else sorted.
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PHH 44? i'm guessing the Mikuni???
anyway, you'd need to set some goals when you go about sizing the turbo. spool ease? overall power? etc.
one of the beauties of turbocharging is the fact that you are FORCING air into the engine, so throttle size doesn't matter so much. your Mikuni may actually be an asset for off-boost driving. could you find a bigger or better carburetor? sure, but (at least in MY opinion) you can make that decision after you have everything else sorted.
anyway, you'd need to set some goals when you go about sizing the turbo. spool ease? overall power? etc.
one of the beauties of turbocharging is the fact that you are FORCING air into the engine, so throttle size doesn't matter so much. your Mikuni may actually be an asset for off-boost driving. could you find a bigger or better carburetor? sure, but (at least in MY opinion) you can make that decision after you have everything else sorted.
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that said, if that's all you want, then you should be able to build around the 13B's Hitachi (maybe get it modified a bit), but i don't see why you'd NEED more than that if you're being serious about what you want.
as for reliability, i also don't see any reason why you'd expect any less reliability than any other turbo rotary Mazda offered if you stick to the basic principle of satisfying the engine - fuel, ignition, intercooling, temperature control, etc.
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you remember that game as a child where you're given side by side photos and then you're asked if they match? well, at least to me, those statements don't match. doubling the original output is pretty extreme from any vantage point.
that said, if that's all you want, then you should be able to build around the 13B's Hitachi (maybe get it modified a bit), but i don't see why you'd NEED more than that if you're being serious about what you want.
as for reliability, i also don't see any reason why you'd expect any less reliability than any other turbo rotary Mazda offered if you stick to the basic principle of satisfying the engine - fuel, ignition, intercooling, temperature control, etc.
that said, if that's all you want, then you should be able to build around the 13B's Hitachi (maybe get it modified a bit), but i don't see why you'd NEED more than that if you're being serious about what you want.
as for reliability, i also don't see any reason why you'd expect any less reliability than any other turbo rotary Mazda offered if you stick to the basic principle of satisfying the engine - fuel, ignition, intercooling, temperature control, etc.
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As I understand the S4 turbo is around 185, I want to be somewhere around 160-170 at the crank (if I can get to 185 safely then I'm cool with that too), not quite double, more like a 55-75% increase (12a's have 110 stock don't they?). I've lightened the car so much already that just having the Mikuni makes a huge difference at 3.5k and above. I've got a Holley fuel pump and I am running it on the low side right now so I think I'll have enough fuel input, I'll have to figure out a mounting situation for the intercooler though because I have an oil cooler installed. I am also running the stock coils, would I need to upgrade ignition?
there are (and have been) quite a few guys that have really well-put-together blow-through 12As. my advice would be to seek out some of those threads and start putting a plan together for yourself. i feel you can achieve your goals. i can't speak to costs, but i can't imagine it being MORE than a 13B-T (considering you'd probably have to build it, too).
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well, Jeff20B already touched on the 12A horsepower numbers, so no need to belabor the details. my original point was really that 80 to 100 HP over stock is not "just a little kick." bolting on a header is just a little kick.
there are (and have been) quite a few guys that have really well-put-together blow-through 12As. my advice would be to seek out some of those threads and start putting a plan together for yourself. i feel you can achieve your goals. i can't speak to costs, but i can't imagine it being MORE than a 13B-T (considering you'd probably have to build it, too).
there are (and have been) quite a few guys that have really well-put-together blow-through 12As. my advice would be to seek out some of those threads and start putting a plan together for yourself. i feel you can achieve your goals. i can't speak to costs, but i can't imagine it being MORE than a 13B-T (considering you'd probably have to build it, too).
Last edited by Shrimp; 10-08-13 at 06:35 PM.
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