blwfly

iTrader: (4)

seeing i cant pm you just start a thread im sur people woud be interested

1.the 12at on your site is it still for sale (i read a comment by you saying they were hard to come by)or was that a one off

2.is it the stock 12at or have you just modified a stock 12a to be turbo

3.if so list the parts you have added

3.i am asuming from the site they arent rebuilt

4what ponies does the motor put out

opps i gotta run ill have more questions im sure people would to

thanks for ya time robert
chris

FirebirdSlayer666

iTrader: (3)

Yeah these are some good questions. Would be some good info to have

680RWHP12A

im eating cheese right now, its lunch time... when im done ill get you the specs on the 12a t motors....
i currently dont have any in stock, but i think corksport has one..

Hades12

Rules say that you cant call someone out by name so you may find that this thread gets deleted.

Tranquil

iTrader: (1)

Oh come on now. That rule is not imposed whatsoever

I make threads with names in them all the time. If you look in the lounge it is commonplace as well.

I'd be interested in knowing that info as well, I'll be waiting Rob!

Unsupa

iTrader: (2)

stock 12at's were fuel injected by 2 800cc injectors and had about 160 flywheel hp. the turbo on the 12at was oil-cooled only, and no intercooler was in the setup.

PaulFitzwarryne

First its technically a 12A with a turbo, but 12AT is commonly used never 12at as there is no lower case in Japanese. The housing in fact only has the usual 12A casting.

Second the power is around 145hp, the 160 quoted is JIS. The official figure given at the Tokyo launch was an increase of 27% above stock, but that was for the normal 12A not the detuned version version exported to the USA.

There are very few 12AT engines around as only some 20% of the 3000 JDM RX7s sold when the option was available went turbo. Most 12ATs exported second hand come from the earlier Cosmo and do not come with the turbo manual gearbox.

Going with a two injector system was a Mazda design mistake corrected in 86, so the best solution is a rebuild with a 13BT center housing or a cheap way is into the inlet manifold.

PaulFitzwarryne

First its technically a 12A with a turbo, but 12AT is commonly used never 12at as there is no lower case in Japanese. The housing in fact only has the usual 12A casting.

Second the power is around 145hp, the 161-5 quoted is JIS. The official figure given at the Tokyo launch was an increase of 27% above stock, but that was for the normal 12A not the detuned version version exported to the USA.

There are very few 12AT engines around as only some 20% of the 3000 JDM RX7s sold when the option was available went turbo. Most 12ATs exported second hand are from the earlier Cosmo and do not come with the turbo manual gearbox. In addition to a US 12A you will have to fit a performance header and exhaust, high pressure fuel system and digital ecu.

Going with a two injector system was a Mazda design mistake corrected in 86, so the best solution is a rebuild with a 13BT center housing or a cheap way is 2 more injectors into the inlet manifold.

rotary emotions

how will you put a 13BT (=86+) center housing in a pre 86 engine (12, 13B, 10A...)??? In 86 (so on all FC engines and upwards) the seals between the housings were moved. The groove for them is either on the sideplates or rotor housings depending the year. So putting an engine together from parts mixed pre and after 86 makes you having no seal groove at all, or two facing eachother.

PaulFitzwarryne

This 12A-13B appoach was fully detailed by Hitman on his website including photographs of the engine components when I first researched upgrading options in 02.

His included the 12A with 13 B centreplate, 13B fuel rail and regulator, Injection Perfection Weber IDA style throttlebody, Haltech ecu and 4 x550 injectors. While this is a NA streetport application, it is also similar to 12AT applications on RX-2/3s who could not legally use 13BTs due to various restrictions.

EDIT apologies just realized you may have a point. The centreplates used might be from 13B not 13BT engines but I am not certain which efi 13B as all the applications I know about were not in the US with the gsl-se. I will try to find more details.

680RWHP12A

i was hoping you would reply... very well said!! i hate typing!!
however the 12a turbo motors did come with 2 fuel injectors, 720 cc to be exact and they are located in the intermediate housing(like the GSL-SE model) but with a intake port half the size of the GSL-SE's intake port...

680RWHP12A

i have seen people do this... its called a "Frankenstein engine" .. its where you fill the cooling seal groove with devcon to be able to mix and match any combonation of housings, but thats a whole new thread topic... it works too :0

blwfly

iTrader: (4)

wow PaulFitzwarryne you have some great information could some one point out the differences between a normal 12a(jappa) and the detuned 12a(usa) just curious

12hades its not like i was flaming or any miss use of his name comeon "relax guy" lol

robert i mean "680RWHP12A"

ok u dont have any in stock but there is possibilitys that you can get your hands on them im in no hurry just researching and understanding things that you have can get etc etc.i know u have a contact and a website but we all can benifet from information in a thread ilistrate questions etc

by meaning you can get your hands on them. do u have a distributor factory or import them or do you just have luck at times through buiseness or customers sorry if its a bit secret squiral just curious if its a pain in the but to get them as 1200 from what i understand is a bargian in ways.

i know you supply some parts to turbo a 12a but have you considered a kit of a sort
all that type made me forget the rest of my questions damn lol

hay to all
im currentley corrisponding emails with the 13b re dvd company from nz seeing im a kiwi there more than happy to work with me im only 20yrs old but im sure im fully capeiball of being a reseller or distributor with a little research and planning what kind of book,video,stores,yearly car shows are there avalible in the oregon- california areas any feedback would be great

edit:hehe mind some of the spelling
cheers
chris

Unsupa

iTrader: (2)

well... to try and make up for my lack of knowledge and 2 minutes of searchin before i posted earlier... i found this to be a good read.

http://cp_www.tripod.com/rotary/pg18.htm

and me and the shift button don't get along too well, that's why there were no caps..

blwfly

iTrader: (4)

thanks ill have a gander through

PaulFitzwarryne

Unsupa- a good post, it's one of my English language sources of information on the 12AT. The estimate of performance increase with higher boost and a FMIC is relatively accurate based on experience with my 85 12AT. But you need a good exhaust system, upgraded fuel supply and digital ecu to achieve it.

There is conflicting info on the injectors, some like Robert say they are 720cc others 800cc. All the RX-7 engines had the later turbo so it might be the early version fitted to the Cosmo and Luce used smaller injectors. My problem is none of the technical manuals were translated from Japanese, and while the press releases are readable, workshop manuals are a different matter and are beyond the capability of the average interpreter never mind my skills.

'Thousands made' is a bit misleading, it was around 3,000 according to one factory source. When the great mass of 12AT cars were scrapped after a very few years in typical Japanese fashion, quite a few of the engines were exported to Aussie and New Zealand as often fitting a 13BT to replace a 12A was illegal. Thus, the price for the occasional 12AT that now comes on the market is higher than for the later 13BT.

In Japan there was a period of butchering 12AT cars them into ricers. But now the remaining cars are collectors' items with more time spent polishing than driving.

As blwfly will tell you, NZ is now the retirement home for secondhand JDM cars including a few genuine 12AT cars with the Cosmo being prefered over the RX-7.

blwfly

iTrader: (4)

hmm once again great info this has brightin my hirizon for a 12a /added tubo now understanding now there was so little made and hard to come by

and yes nz had a great relationship with japan impoting any kind of car till 96 when saftey standards came into role and you couldnt get the older cars form 96 below i belive?
due to reinforcment doors and air bags kinda usless info but anyway

BOOSTD 7

Hey guys, Robert now has his own subforum for Rotaryshack ... check it out here.

https://www.rx7club.com/rotaryshack-164/

Oh, and he can get and send PM's now too

jayroc

[QUOTE=PaulFitzwarryne]First its technically a 12A with a turbo, but 12AT is commonly used never 12at as there is no lower case in Japanese.
QUOTE]

And there is no upper case in Japanese either. :P I don't think it matters, it's like saying v8 vs V8 or V-8...