1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

12A mods: realistic or not?

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Old Sep 8, 2010 | 02:47 AM
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12A mods: realistic or not?

I was wondering if the following mods would increase power and not destroy the engine and if it does work, how much hp and torque gain is possible?
-StreetPorted
-Weber 48 IDA carburetor
-Turbonetics Ball Bearing Turbo (T3 Turbo, To43 polished comp cover, full ball bearing unit, and .63 exh housing)
-ASE Front Mount Intercooler Kit with throttle body adapter
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Old Sep 8, 2010 | 09:09 AM
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Originally Posted by scenesk8erjdh
I was wondering if the following mods would increase power and not destroy the engine and if it does work, how much hp and torque gain is possible?
-StreetPorted
-Weber 48 IDA carburetor
-Turbonetics Ball Bearing Turbo (T3 Turbo, To43 polished comp cover, full ball bearing unit, and .63 exh housing)
-ASE Front Mount Intercooler Kit with throttle body adapter
Yes they would increase power and if they were done correctly with supporting mods they would not destroy the engine. There are people on this forum making upwards of 200 RWHP (this is a pretty damn good increase and feels awesome in a FB) with setups similar to this. If you hit the search button in the upper right hand area of the 1st Gen Forum and look around for a while you will find a lot of info as this has been covered pretty thoroughly.
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Old Sep 8, 2010 | 09:24 PM
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12A is a better motor for a Daily Driver or 24 hour racer due to lighter internals and lower fuel consumption, not to say it could not be boosted but there are so many 13B mods with a lot less work. Dyno tuning a turbo through a carb will default to rich, and getting set perfectly is about as hard as swapping in a harness and complete TII setup IMHO. If you are planning a drag/track car build whatever you want but on the street the top end power is less useful than a stable idle and usable mid-range.
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Old Sep 8, 2010 | 11:37 PM
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What are you asking? If it's possible to do a streetported blow-through motor? Of course it is. I'm daily-driving one.

Would it increase power? Duh. How much power? Depends on your boost and your turbo. (Sorry, I don't know crap about turbo sizing; that's still witchcraft to me. Ask the single turbo section.)

Don't know what a throttle body adapter is, unless you're talking about a carb hat.
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Old Sep 9, 2010 | 04:27 AM
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I'm asking would it be worth the money in power or should I just look for an engine swap?
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Old Sep 9, 2010 | 08:19 AM
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It would be a lot more work setting up a blow through 12AT, compared to swapping in a 13BT from a 2nd gen.
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Old Sep 9, 2010 | 10:24 AM
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From: https://www2.mazda.com/en/100th/
Originally Posted by scenesk8erjdh
I'm asking would it be worth the money in power or should I just look for an engine swap?
the 13bt is stock, you can build it to stock specs in the manual, toss it in and have fun from there.

blow thru is a lot of time spent getting things to fit/work together plus a lot of time tuning before you can just go drive it

i think its worth looking for a 13bt/cosmo/fd engine and call the blow thru plan B
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Old Sep 9, 2010 | 10:58 AM
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Yep. 13BT swap is the way to go. Might cost a little more, but there's way less work and frustration involved.
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Old Sep 9, 2010 | 11:39 AM
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How much would the fd turbo engine be and where could I get it for cheap?
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Old Sep 9, 2010 | 09:46 PM
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From what Ive erad, TII motors are cheaper and easier to swap than an FD motor. Motor mount from 12A can be adapted to TII, transmission from a 12A can also be adapted to TII if have read correctly.
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Old Sep 9, 2010 | 09:55 PM
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or do the work to the 12a the learning experience of carb tuning, and figuring things out is most of the fun if you have the patience that is...I have a stage 2 ported 12a, with holley intake setup, and a custom header i made thats dual exhaust that exits before the passenger side rear tire... its was a fun experience...i did these mods made a great improvement on my car, DLIDFIS, i had a 85 gsl with a 12a, so i took oil cooler system off a 82 i think, with a remote oil filter stand below my batt, and a block plate to get rid of the water-air oil cooler thing...a bigger radiator, etc....
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Old Sep 9, 2010 | 11:20 PM
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Originally Posted by 84 GSL
From what Ive erad, TII motors are cheaper and easier to swap than an FD motor. Motor mount from 12A can be adapted to TII, transmission from a 12A can also be adapted to TII if have read correctly.
In a first-gen, TII or REW blocks are equally easy. The only potential trouble with the REW is the stock twin turbos, but if you go single like you should, that doesn't matter. With either one, all that's needed to use an NA trans is an NA clutch/flywheel setup. If you want to use a stock flywheel, S4 TII motors would use the S4 NA flywheel, S5 TII or REW would use the S5 NA flywheel.
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