What's up with a 12A turbo???
10-24-04, 02:31 AM
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Driveline Killer
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What's up with a 12A turbo???
Well I blew the motor up on my 1984 GSL.
It only has 91,000 original miles on it and the motor, sadly enough, only had about 50k on a rebuild that was 3 or so years old.
I was going to throw in a 13b gsl-SE motor with a carb and call it a day when I realized that I kew someone that has a 12a Turbo sitting around. It's a stock JDM 12aT motor. Now we don't know to much about these motors other than they make a rated 165 horsepower at 6,500 rpm but, what is the torque rating. I was thinking of running it on a GSL-SE computer with a profec B boost controller.
Let me know if anyone in here has used this motor before. How is it and such?
It only has 91,000 original miles on it and the motor, sadly enough, only had about 50k on a rebuild that was 3 or so years old.
I was going to throw in a 13b gsl-SE motor with a carb and call it a day when I realized that I kew someone that has a 12a Turbo sitting around. It's a stock JDM 12aT motor. Now we don't know to much about these motors other than they make a rated 165 horsepower at 6,500 rpm but, what is the torque rating. I was thinking of running it on a GSL-SE computer with a profec B boost controller.
Let me know if anyone in here has used this motor before. How is it and such?
10-24-04, 03:37 AM
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Haven't got any hands on experience (they weren't sold in Europe, and not many engines have been imported either) but learn a bit more here:
http://www.hitman.hm/12AT-hints.htm
http://www.hitman.hm/12AT-hints.htm
10-24-04, 03:24 PM
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Driveline Killer
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Originally Posted by FB II
worthless, tiny *** ports. get you a good stock 12a and add a turbo to it. you'll make alot more power. 
10-24-04, 03:34 PM
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Originally Posted by TurboIIGuy
Well I was thinking of doing a rebuild on it an in the process swapping out the center steel and outer steels for those from a turboII motor, instead of doing a port job that is.
Not possible. A 12AT is an early style engine. 86-up engines had the side seals relocated. Pre 86 and 86 up housing parts can't be mixed.
But you can always port the 12AT.
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07-02-05, 06:34 PM
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Originally Posted by rotary emotions
Not possible. A 12AT is an early style engine. 86-up engines had the side seals relocated. Pre 86 and 86 up housing parts can't be mixed.
But you can always port the 12AT.
But you can always port the 12AT.
How about swapping the steel end plates with those from a 13b 4 port rotary truck.
I just got my hands on some....
07-02-05, 07:40 PM
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Originally Posted by TurboIIGuy
12A efi turbo motor
Now we don't know to much about these motors other than they make a rated 165 horsepower at 6,500 rpm but, what is the torque rating. I was thinking of running it on a GSL-SE computer with a profec B boost controller.
Let me know if anyone in here has used this motor before. How is it and such?
Now we don't know to much about these motors other than they make a rated 165 horsepower at 6,500 rpm but, what is the torque rating. I was thinking of running it on a GSL-SE computer with a profec B boost controller.
Let me know if anyone in here has used this motor before. How is it and such?
I have one in my 1985 and it's a great motor. Mine is slightly modified to produce about 215rwhp with good low down power and torque.
This is what I have done.
1. install a large front mounted intercooler.
2. keep the 12 AT dizzi and fit a fuel only Microtech ecu.
3. add a BOV, upgraded fuel system including surge tank.
4. efficient 2 1/2 inch exhaust system.
5. add a front mounted oilcooler, the hitachi turbo is oil cooled so this is advisable.
The car is my daily driver so I was only looking at around 200rwhp. on 12psi boost. The FMIC makes that safe. Top speed is 145mph after which the front end floats, with a 12.5 second 1/4 mile. Fuel consumption is 20mpg in the city, 28mpg highway.
At this level the stock ports and turbo are adequate. If you want a competition car with 300rwhp I would suggest adding two more injectors, upgrade the turbo and street port.
Most of the 12AT imports came from the early Cosmo, the majority being automatic. In which case you will need a light steel flywheel. It may also have the early 18-BM turbo.
07-03-05, 05:45 PM
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Originally Posted by TurboIIGuy
How about swapping the steel end plates with those from a 13b 4 port rotary truck.
I just got my hands on some....
I just got my hands on some....
Interestingly, all the engine builders here I've talked to highly recommend not using the n/a rotors if going for any sort of decent power levels and reliability.
07-04-05, 12:56 AM
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Originally Posted by REVHED
That will work. I'm in the process of building a 12A Turbo and I'm using the plates from a Series 2 12A. With a large extend port of course. Interestingly, all the engine builders here I've talked to highly recommend not using the n/a rotors if going for any sort of decent power levels and reliability.
Interestingly, all the engine builders here I've talked to highly recommend not using the n/a rotors if going for any sort of decent power levels and reliability.Most of the 13bT motors I have put together in the past have gotten a set of N/A rotors in them also.
You don't need to boost high.
We usualy set up a T2 block with N/a rotors to run at 9 psi of boost.
One of my buddys is driving around on 12 pounds with no problems on a t4 turbo with a FMIC. It gives you much better low end power for streetability.
I know a few shops that preffer to do this.
Bullet racing that used to be up in Northen Cali. i believe it was had a shop recipe.
It was a very particular street port with exhaust porting and they were pulling 300+RWHp on average from N/A rotors on 8 psi. I think they were using the 60-1 Turbo size.
So I don't really understand this whole thing about reliability not being possible with N/A rotors....
07-04-05, 01:45 AM
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Originally Posted by PaulFitzwarryne
I have one in my 1985 and it's a great motor. Mine is slightly modified to produce about 215rwhp with good low down power and torque.
The car is my daily driver so I was only looking at around 200rwhp. on 12psi boost. The FMIC makes that safe. Top speed is 145mph after which the front end floats, with a 12.5 second 1/4 mile. Fuel consumption is 20mpg in the city, 28mpg highway.
The car is my daily driver so I was only looking at around 200rwhp. on 12psi boost. The FMIC makes that safe. Top speed is 145mph after which the front end floats, with a 12.5 second 1/4 mile. Fuel consumption is 20mpg in the city, 28mpg highway.
Mid 12Sec qtr miles and 28 MPG hwy sound very nice.
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