12ATURBO or 13bturbo
 

so im debating on what engine to get.. i know 13t can put out way more power much easier.. or so iv been told.. i do not intend to custome make the turbo for the 12A .. the engine i seen for sale is the actiuall 12At from jap.... but iv heard the 12A is waay more reliable.. and puts out a cleaner tone on the exhaust.. iuno... :shocking: help

youve got alot of misconceptions. a 12a can make almost as much as a 13b, with similar mods. as far as reliability, if your keeping them stock, i would say the 13b, seen as how so many more where produced. the 13b also has a larger aftermarket, but i think overall a 12at would cost less to build. and as far as the exhaust note, that all depends on turbo, mufflers, wastegate.

12A turbo.

Leave 2mm apex seals for those 2nd gen suckers.

lol, i forgot about that!!

I am always torn between the 3 myself, the factory 12at, making your own 12at or the S5 13B, I can never make up my mind. Right now I think I am leaning twords the do it yourself 12at or a supercharged 12a. mmm... 12asc

I personally say it will be near impossible to find a jdm 12at, and if you don't want to custom fab all the parts for a 12a turbo then go with the 13bt.

I've got a JDM 12AT rebuilt by www.PineappleRacing.com

http://www.corksport.com/store/categ...c_engines.html also has them listed for sale.

Mine's still in the break-in period awating tuning. Looking good so far. I can't compare it to a 13BT though because I've never driven one.

For the same modification a 13BT makes 8% more power than the 12AT. The difference stock of 24% [182hp v 147hp] was due to a more aggressive turbo set-up, sports car as against fast sedan with lowdown power.

To rebuild and modify a 12AT is more expensive than a 13BT, you will need an intercooler, an aftermarket ecu, and upgraded turbo. For equivalent modified power, installing four injectors[800 and 550cc], and larger ports are esssential. If you are dropping the 12AT into a late FB then I suggest a new oil cooler and SA style radiator.

I agree there is no difference in noise, the main factor is muffler design.

^Which engine came out of a fast sedan? If memory does me justice both the 13B and 12At come out of Rx-7s. And saying with similar modifications they make a 8% differance in power is making a lot of assumptions. Also how does the 12At make up 16% of power when modified?

The 12AT first came out as options for the Cosmo and Luce.The Cosmo sedan was then the fastest Japanese production car. The 82 RX-7 still only came with the 12A 6p with about 114hp. When sales of the RX-7 slumped in Japan, the 12AT engine was made on option on the 1984 model RX-7 GT, GT-X and SE Limited models. The 85 model Limited Version was the only RX-7 model which only came out with the 12AT. All Rx-7s came out with the later second series 12ATengine with a slightly different Hitachi turbo and around 4hp more.

The Cosmo and Luce also were available with the 13B years before the RX-7 got it with the GSL-SE. The 13B was variously upgraded, finally becoming available as the 13BT. While it was available in the Cosmo[which finally in 92 also used the 20B in its top model], the FC was the prime target for the 13BT engine as the new faster Skyline had killed Cosmo sales. The FC needed the extra power as it had become a heavy 944 look-a-like. The 13BT in its final 93 REW format had different twin turbo set-ups for the FD and Cosmo.

A 12AT can be modified in the same way as a 13BT. While still retaining streetability, the engine can be modified up to 400rwhp.The route is FMIC, porting,increased boost, larger turbo, digital ecu, 4 injectors[800cc and 550cc are just adequate], upgraded header and exhaust upgrades, performance fuel system. My daily driver is primarily bolt-on moded and gives 224rwhp at 12psi. My wife's 85 SE-Ltd spec fast shopping cart will be more powerful at 300rwhp with enlarged ports and 4 injectors.