MIKE-P-29

Can a turbo from a 88 13B T2 be made to work on a 12A? Or is this one of those things that would cost way too much to make it work?

moremazda

iTrader: (4)

Yes, just find a 12a turbo maifold. Are you FI or carbs?

MIKE-P-29

Right now its all parts, awaiting porting and such.

I think im gonna go with either a Weber or a modified Nikki? of course carb and a turbo is a no no right? Man I feel so stupid on this turbo biz.

Its just that I found one in great condition for $200, manifold and all

Felix Wankel

Get an 89+ turbo if you can find one. They are a lot better.

PaulFitzwarryne

You need a 12a manifold, and as Felx says it is best to have a 1989+ model turbo.

You will need to upgrade your fuel pump and possibly your modified Nikki to something with a higher cfm.

MIKE-P-28

iTrader: (1)

I need a 12A turbo manifold (Jspec right?) And its best to get a 89+ turbo... Also need big fuel pump, and something to supply more fuel so I dont go lean...Thanx, Im learning, sorry for stupid questions...

What other stuff am I gonna need to do it right? An FMIC? etc?

PaulFitzwarryne

Mike, which of your three RX7s are you converting? Are you porting, having a Turbo or adding a superchager? Are you doing it yourself by buying a rebuild kit or having it done by a tune shop? You have covered each situation in a series of different threads, so its quite difficult to give a meaning full professional response. The Forum is already full of general advice, that is why people like Pineapple Racing charge $50 an hour for detailed advice on improving a specific car.

There were several different 12a motors, each has to be dealt with seperately.

1. Adding a turbo to a 12a is simple, if you are rebuilding the motor with new seals there should be no problem for at least 50,000 miles. Tuning the engine is a different matter,

2. Remember the Jspec 12at was 4 port, lower combustion and had OIL INJECTION. Some of the early UK attempts to add turbos to stock new 12a engines ran into oil starvation problems besides manifold cracking.

3. Check which 12a you have got, is it the series with inefficient oil coolers? If so add a better oil cooler.

4. Are you going EFI? The 12at gained its performance in part like the 13b gsl-se from switching to EFI. As stated elsewnereto you, modifying to EFI is expensive but you could sell your existing modified set-up.

5. I fully support your decision, stated elsewhere, to simply drop in a 13bt, that will leave you with a dismantled 13a motor and secondhand turbo you can sell to pay for the conversion.

6. If you want to keep to the 12a, and have the cash after selling one of the three cars, simply import a 12at long motor drop that in.

7. Buy a 12at gearbox if you have the cash as it is stronger than what you have now.

8. Have a custom intercooler fitted, the air temperature in Japan is gwnerally lower than the US especially in Kentucky. Have a look at the Mazdaracing site.

9. Buy a new clutch to street/race specs from someone like Mazdatrix.

!0. If all else fails or you want to minimise your own work or question asking go to any good rotary engine builder, deposit $10,000, and come back a month later and turn the key! It will be a lovely sound.

MIKE-P-28

iTrader: (1)

Ok, Paul and guys...

The car im doing this on is a 1985 Rx-7 GSL orginally equiped with a 12A... The other 2 cars Im gonna leave bone stock. The vert is too damn heavy for any performance mods. The 80 is way too rusted for any amount of money to be spent on it

Im just trying to see what path im gonna take before I get there.....I like to TAOTALLY have everything planned with minimal hassle when I get there...

The first series of questions determined what porting i was gonna do etc. Now I got that figured out Thanks to you guys...

The porting will be done by a shop, the rest of the rebuild will be done by me. I have done a few other rotary rebuilds so I know what to expect there...

Ok now that we got all that, what Im kinda pondering is can a turbo be fitted rather more reasonably in price than a supercharger. Cuz turbos are PLENTIFUL everywhere and rather cheap used..

Here are my options as I see them...

1) Use my current or soon to be current 12A streetported and an later model turbo.. this will cause 2 problems -1) getting a EFI unit that will work and reasonably priced 2) will cause problems down the road. (Seems be the cheapiest of all)

2) Just have a 13bt rebuilt and streetported and use it.. The probs with this will be getting the factory efi etc to work in it and finding the parts. (Seems to be the most time consuming and biggest hassle or course seems to be maybe cheap and good outcome)

3) Use my current 12A streetported with a supercharger which seems to be the easiest solution.. I just wanted to try to find a way to get adequate power and not spend a total fortune...(Seems to be almost expensive as option 2, and dont know if I'll get a ton of power outta it)

IM REALLY sorry guys for seeming like a yo yo, but I got the first part figured out now

Lastly a little background on me, Im a car audio installer for 12 years, wiring is NOT a problem as long as I have appropriate diagrams and etc. I can do body work and paint cars. This turbo biz has totally got me screwed, I just dont wanna spend a ton of money and realize I have made a BIG MISTAKE.

Cheers mate, I think I know what I need to do now...

PaulFitzwarryne

Mike, thanks we have got the question sorted out. In my area of work we often have more difficulty in getting the question right, than providing the answer.

I fully support the idea of planning everything out, not that my plans always work. Under the house are numerous boxes filled with parts that did not fit or did not live up to the claims in the advertisement.

As you will end up with a rebuilt 12a, and have a seconnd turbo, go down that track using the appropriate carb such as a Weber. Several firms can supply the necessary manifolds and gaskets. I would suggest a better oilcooler is fitted as with the turbo oil temperature and flow is important. In your plans add a good fuel pump and MSD ignition

It will not be the optimum, but you will end up with a cheap solution to achieve 200-250hp.

Good luck.

MIKE-P-28

iTrader: (1)

I didnt say that was the solution i was going with, but you already knew. I'll let you guys know how it works out, cuz the 12A, carb and 2nd hand turbo is where im headed... I see I need to get rid of that poor excuse for an oil cooler Mazda called proper. Direct fire ignition was a given turbo or not, and definatly a step up fuel pump, and carb...

I'll let everyone know how it works

Rotor13B

someone that has done this before needs to step up to these kind of questions. I know it's copying, but i also think that is the purest form of flattery...(*_*)

Rotor13B

MIKE-P-28

iTrader: (1)

Thanks for the support. I know when I get into doing this I have gonna have more questions....