Toyota MR2 Message Board - View Single Post

Jackstand Queen · 03-14-2009, 12:51 PM

The SC14 is cheaper and easier to find. Some Jspec importers have them laying around like Makoto Motors in Kalifornia.

The 14 is a very poor fit in the Mk I engine bay. You have to grind and cut the intake manifold, and J-pipe. to make it fit. You have to have an SC12 oil resavoir end piece to put on the 14. You have to have the inlet and outlet pieces cut and welded together with pieces of both 12's and 14's coming together. Or you could totally fab customized pieces from scratch. You need to cut off the bottom SC mounts and relocate them to match the SC12. This is about the hardest and most critical fab job. Too high, too low, too far forward or backward, too close to the block, too far and it won't work. You'll need a new SC belt too most likely. You'll have to dissassemble both 12 and 14 clutch pulleys and move the portions of the 12 stuff over to the 14.

Also the ABV will interfere with the 14. It will need to be modified to fit a whole lot closer to the Jpipe to fit. Or better yet, use a Bosch ABV. The Jpipe mounting holes will need to be reemed out to allow it to bolt on cocked at an angle.

You will need to fab in custom made upper mount braces that go to the intake manifold.

The stock ECU runs the 14 fine. I recommend either higher pressure fuel pump, or 10 to 20 % larger injectors . . . but not both.

Overall its a buttload of work. To me it makes more sense to put in an SC14 rather than spin an SC12 faster with oversized main pulleys. With my N.A. throttle body mod I reckon, I'll get 13 or 14 PSI. I was getting 12 with the SC Throttle body. I could always get 10 PSI instantly above 2000 RPM.

Overall I can't highly recommend this modification. Its a lot of work, with lots of pitfalls. Cost wise, the welding and ABV replacement drive up the cost. And you can increase an SC12's boost with oversized pulleys.

However, pristine, low mileage SC12's are mythical beasts. Parts to rebuild SC12's not available as far as I know. New SC12's from the yota Dealer were 2 grand, last time I checked. And perhaps not available even at that price.

Viewpoints and opinions differing with this post are encouraged. I'd like to know if I got some of my facts wrong.

03-14-2009, 12:51 PM	#2 (permalink)
Jackstand Queen Cage Fighter Join Date: May 2008 Posts: 677 Thanks: 52 Thanked 56 Times in 53 Posts iTrader Rating: (1/100% )	The SC14 is cheaper and easier to find. Some Jspec importers have them laying around like Makoto Motors in Kalifornia. The 14 is a very poor fit in the Mk I engine bay. You have to grind and cut the intake manifold, and J-pipe. to make it fit. You have to have an SC12 oil resavoir end piece to put on the 14. You have to have the inlet and outlet pieces cut and welded together with pieces of both 12's and 14's coming together. Or you could totally fab customized pieces from scratch. You need to cut off the bottom SC mounts and relocate them to match the SC12. This is about the hardest and most critical fab job. Too high, too low, too far forward or backward, too close to the block, too far and it won't work. You'll need a new SC belt too most likely. You'll have to dissassemble both 12 and 14 clutch pulleys and move the portions of the 12 stuff over to the 14. Also the ABV will interfere with the 14. It will need to be modified to fit a whole lot closer to the Jpipe to fit. Or better yet, use a Bosch ABV. The Jpipe mounting holes will need to be reemed out to allow it to bolt on cocked at an angle. You will need to fab in custom made upper mount braces that go to the intake manifold. The stock ECU runs the 14 fine. I recommend either higher pressure fuel pump, or 10 to 20 % larger injectors . . . but not both. Overall its a buttload of work. To me it makes more sense to put in an SC14 rather than spin an SC12 faster with oversized main pulleys. With my N.A. throttle body mod I reckon, I'll get 13 or 14 PSI. I was getting 12 with the SC Throttle body. I could always get 10 PSI instantly above 2000 RPM. Overall I can't highly recommend this modification. Its a lot of work, with lots of pitfalls. Cost wise, the welding and ABV replacement drive up the cost. And you can increase an SC12's boost with oversized pulleys. However, pristine, low mileage SC12's are mythical beasts. Parts to rebuild SC12's not available as far as I know. New SC12's from the yota Dealer were 2 grand, last time I checked. And perhaps not available even at that price. Viewpoints and opinions differing with this post are encouraged. I'd like to know if I got some of my facts wrong. Last edited by Jackstand Queen; 03-14-2009 at 10:33 PM.