1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

12a turbo questions

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Old Dec 28, 2010 | 07:28 PM
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12a turbo questions

Ok I have been outta the rx7 game for a while and went to building Honda's (yea yea) but I want to get back in to the rx7 game cause it is my favorite motor or motors...well I have searched for hours and still unsure bout somethings....which is better for a turbo setup on the 12a drawback or blowthrough? Next I know I want to go bridgeported and something like a 48ida...also with this will or can I use a fuel management system...one more thing is there turbo kits that can be bought or do I just piece them together and fab the innercooler piping...
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Old Dec 28, 2010 | 07:39 PM
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And I'm lookin to be somewhere in the 250whp range..
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Old Dec 28, 2010 | 07:42 PM
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Check mine out the video is in the signature. its turbo and bridge ported
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Old Dec 28, 2010 | 08:07 PM
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For just 250whp I don't think a bridgeport is what you want. A streetport will just about any turbo will get you there. A BNR upgraded TII turbo and a streetport will get you 250-350, same port with a bigger turbo can get closer to 500 or more. All the porting terms are just general shapes, the actual size of the port can be VERY different between two "streetports"

Blowthrough is much better than drawthrough, use fuel injection if you can afford it.

There are some old kits floating around, but most likely you'll need to piece together your own kit.
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Old Dec 28, 2010 | 08:12 PM
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Originally Posted by coldy13
For just 250whp I don't think a bridgeport is what you want. A streetport will just about any turbo will get you there. A BNR upgraded TII turbo and a streetport will get you 250-350, same port with a bigger turbo can get closer to 500 or more. All the porting terms are just general shapes, the actual size of the port can be VERY different between two "streetports"

Blowthrough is much better than drawthrough, use fuel injection if you can afford it.

There are some old kits floating around, but most likely you'll need to piece together your own kit.
Ok...now that u mention it me and my building buddy was looking to get a big street port...and he did mention going fuel injected....but how do we go about the conversion...and what's the estimate price u think on making it fuel injected...
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Old Dec 28, 2010 | 08:21 PM
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You can start of getting a 12A-T motor set for a great price if you want 12a and turbo
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Old Dec 28, 2010 | 09:47 PM
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From reading the 12a-t motors really don't see much gain from boosting...or am I misunderstanding something...
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Old Dec 29, 2010 | 09:33 AM
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12at motors have lower compression rotors
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Old Dec 29, 2010 | 10:41 AM
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UGHHHH! This question must come up 1,000,000,000,000,000,000,000 times a day. Look in the archives, there is a thread by Manny (MoreMazda) that walks you through step by step of setting up a blowthrough set-up on a 12a. I can tell from your original post that you deffinitely have NOT searched. Because if you had all of these rudimentary questions would have already been answered. Hell I just posted in another thread a week ago why a street driven turbo car won't benefit from a bridgeport.

Don't take this the wrong way, but this is coming from a guy that is smack dab in the middle of a 12a blowthrough conversion. There is WAY MORE that enough information already posted to get you started, and just to put it in perspective for you; I've been planning and educating myself about this project for the last 3 years. You need to have a good solid understanding of what you're doing before you ever start tearing anything apart. Learn how to rebuild your motor, learn how to do your own porting, learn to tune a carb because all of these are necessary components to a well running turbo motor.

Again, nothing personal, but every joker comes on this board and thinks they can turbo there 12a for $500 and make 250-300 hp. Then, undoubtedly, they ask the same questions....... "How do I turbo my 12a?" "How do I fuel inject my carb?" "What kinda PCM do I need to get for my Weber carb?"

As you can understand it gets a little tiring. Here's the straight truth on a 12a turbo set-up.

1. Whatever you think it's going to cost... take that magic number in your head and TRIPLE it. Then you'll be close.
2. Take the time you think it's going to take to complete the project and DOUBLE it.
3. Finally, when you think you'v read everything there is to turboing your 12a, and you feel confident you know everything...... read everything again.

Ok.... I'm getting of my soapbox now. Carry on...
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Old Dec 29, 2010 | 11:21 AM
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From: queens n.y.
,,,,search man search
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Old Dec 29, 2010 | 02:17 PM
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Originally Posted by 81WideMariah
UGHHHH! This question must come up 1,000,000,000,000,000,000,000 times a day. Look in the archives

Because if you had all of these rudimentary questions would have already been answered.

Again, nothing personal, but every joker comes on this board and thinks they can turbo there 12a for $500 and make 250-300 hp. Then, undoubtedly, they ask the same questions....... "How do I turbo my 12a?" "How do I fuel inject my carb?" "What kinda PCM do I need to get for my Weber carb?"

As you can understand it gets a little tiring.

1. Whatever you think it's going to cost... take that magic number in your head and TRIPLE it. Then you'll be close.
2. Take the time you think it's going to take to complete the project and DOUBLE it.
3. Finally, when you think you'v read everything there is to turboing your 12a, and you feel confident you know everything...... read everything again.

Ok.... I'm getting of my soapbox now. Carry on...
Wow, "Get out of my head!!!!" You said everything I always
"want" to say, yet I show restraint (because I am a moderator).

Kudos!! - well said.
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Old Dec 29, 2010 | 02:54 PM
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Originally Posted by 81WideMariah
UGHHHH! This question must come up 1,000,000,000,000,000,000,000 times a day. Look in the archives, there is a thread by Manny (MoreMazda) that walks you through step by step of setting up a blowthrough set-up on a 12a. I can tell from your original post that you deffinitely have NOT searched. Because if you had all of these rudimentary questions would have already been answered. Hell I just posted in another thread a week ago why a street driven turbo car won't benefit from a bridgeport.

Don't take this the wrong way, but this is coming from a guy that is smack dab in the middle of a 12a blowthrough conversion. There is WAY MORE that enough information already posted to get you started, and just to put it in perspective for you; I've been planning and educating myself about this project for the last 3 years. You need to have a good solid understanding of what you're doing before you ever start tearing anything apart. Learn how to rebuild your motor, learn how to do your own porting, learn to tune a carb because all of these are necessary components to a well running turbo motor.

Again, nothing personal, but every joker comes on this board and thinks they can turbo there 12a for $500 and make 250-300 hp. Then, undoubtedly, they ask the same questions....... "How do I turbo my 12a?" "How do I fuel inject my carb?" "What kinda PCM do I need to get for my Weber carb?"

As you can understand it gets a little tiring. Here's the straight truth on a 12a turbo set-up.

1. Whatever you think it's going to cost... take that magic number in your head and TRIPLE it. Then you'll be close.
2. Take the time you think it's going to take to complete the project and DOUBLE it.
3. Finally, when you think you'v read everything there is to turboing your 12a, and you feel confident you know everything...... read everything again.

Ok.... I'm getting of my soapbox now. Carry on...
Ok I am very knowledgeable about building turbo cars...and this is not my first rx7 build either so I know it's not gonna cost 500 to turbo...my thing is I wanna make enough power to have an 11-10sec 7....so I only ask the questions to get a direct answer instead of going through hours of threads to find the answer...and as long as it took u to write that message u coulda been a nice dude and put a couple links to answer my questions...
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Old Dec 29, 2010 | 03:42 PM
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From: Fort Stewart, GA
Originally Posted by Acrite3404
Ok I am very knowledgeable about building turbo cars...and this is not my first rx7 build either so I know it's not gonna cost 500 to turbo...my thing is I wanna make enough power to have an 11-10sec 7....so I only ask the questions to get a direct answer instead of going through hours of threads to find the answer...and as long as it took u to write that message u coulda been a nice dude and put a couple links to answer my questions...

i have spent more than 6 k in my 12a turbo.

BB T72 TURBONETICS TURBO
MICROTECH ECU
INTECOOLER
EXHAUST MANIFOLD MADE BY GATO PERFORMANCE
THROTTLE BODY
4 INJECTORS
LOW COMPRESSION ROTORS
ENGINE REBUILD AND PINNED
FUEL PUMP AND REGULATOR
RB INTAKE

ETC ETC ETC
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Old Dec 29, 2010 | 04:15 PM
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Originally Posted by boriquaguerrero
i have spent more than 6 k in my 12a turbo.

BB T72 TURBONETICS TURBO
MICROTECH ECU
INTECOOLER
EXHAUST MANIFOLD MADE BY GATO PERFORMANCE
THROTTLE BODY
4 INJECTORS
LOW COMPRESSION ROTORS
ENGINE REBUILD AND PINNED
FUEL PUMP AND REGULATOR
RB INTAKE

ETC ETC ETC
That included the labor too rite??
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Old Dec 29, 2010 | 04:37 PM
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The motor pinning and low compression rotors aren't cheap. I think if you plan on running over 300hp you need studs or pins, I think people have made closer to 400 without them, but that's pushing it and asking for cracked plates. Pinning every tesnion rod hole isn't necessary, 5 is good, I've heard 2-3 is all you really need.

For 250rwhp you don't need them, but if you want to run 10-11's 250hp won't get you there without serious weight reduction.
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Old Dec 29, 2010 | 04:39 PM
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From: Fort Stewart, GA
Originally Posted by Acrite3404
That included the labor too rite??
yes labor include it
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Old Dec 29, 2010 | 05:08 PM
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Originally Posted by Acrite3404
Ok I am very knowledgeable about building turbo cars...and this is not my first rx7 build either


Originally Posted by Acrite3404
so I know it's not gonna cost 500 to turbo...my thing is I wanna make enough power to have an 11-10sec 7.
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Old Dec 29, 2010 | 05:22 PM
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^ I agree!
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Old Dec 29, 2010 | 06:15 PM
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Originally Posted by Directfreak




I don't have to lie to u sack lovers....I know what I have built.....so if u are not in here to help answer a couple questions...stay out....thanks...
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Old Dec 29, 2010 | 06:43 PM
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You should know, DirectFreak has got an awesome turbo setup....and if you're ever looking for quality advise....he's one of the 10 or 15 guys on this forum that you should ALWAYS listen to.
If you're looking for free advise....might not want to alienate that dude.... but you're a big boy....do what you want.
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Old Dec 29, 2010 | 07:03 PM
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Originally Posted by Directfreak





Like Pat said.... Alex (Directfreak) is one of the pioneers of turbo swaps and has one of the nastiest FD swapped FB's you'll find anywhere. The point is this... you're not even willing to put in the work to find the info that you need, how in the hell are you going finish a turbo build???

The questions you are asking showcase your level of in-experience. This may not be your first turbo car build.... but you're leaving the land of $400 ebay turbo kits for D16's. Rotaries are expensive.... they are unforgiving of ignorance.... and they WILL bite you in the *** if you lack experience.

You may not like what I'm saying, BUT I might just save you a few thousand dollars and a few months of your time. That, AND we real rotorheads won't have another wannabe boy-racer standing over in Honda-land spouting off about how rotaries are un-reliable and they blow up if you look at them weird.

In life you either do the work or pay someone else to do it for you..... you're just looking for a handout, and this isn't the place to get spoon fed.

Hit up the FAQ's/Archives and start reading..... or shell out the cash and take it somewhere to get it done.

I'M OUT!
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Old Dec 30, 2010 | 03:15 PM
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Originally Posted by 81WideMariah
Like Pat said.... Alex (Directfreak) is one of the pioneers of turbo swaps and has one of the nastiest FD swapped FB's you'll find anywhere. The point is this... you're not even willing to put in the work to find the info that you need, how in the hell are you going finish a turbo build???

The questions you are asking showcase your level of in-experience. This may not be your first turbo car build.... but you're leaving the land of $400 ebay turbo kits for D16's. Rotaries are expensive.... they are unforgiving of ignorance.... and they WILL bite you in the *** if you lack experience.

You may not like what I'm saying, BUT I might just save you a few thousand dollars and a few months of your time. That, AND we real rotorheads won't have another wannabe boy-racer standing over in Honda-land spouting off about how rotaries are un-reliable and they blow up if you look at them weird.

In life you either do the work or pay someone else to do it for you..... you're just looking for a handout, and this isn't the place to get spoon fed.

Hit up the FAQ's/Archives and start reading..... or shell out the cash and take it somewhere to get it done.

I'M OUT!
Ok I'm tired of the disrespectlike I said in the first post these are my favorite motors and my very first car was a 82 gsl that me and a friend built na...so do disrespect me wit that me talkin **** about rotory motors....and yes I am takin this personal...I asked the questions cause I wa on my phone for 3hrs reading info and wanted to make sure I got the rite answers...and yea he may know his **** bout building a 12a turbo...so just cause he does doesn't mean I gotta kiss his ***...and second sorry I don't build bullshit eBay cars...my Honda build cost me 9k min....so u can step off wit that single cam eBay.....


That rite there alone is about 7500 worth of build...so like I said I am no rookie in the turbo game period...it's all pretty much the same concept wit a tweak here and there...all I was lookin for was a direct answer not to be told to search...all the **** talkin you guys are doing coulda been time used to either help me wit some links or answered the questions....
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Old Dec 30, 2010 | 03:41 PM
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dude to take it personal is never going to end well.

Heard the phrase when in rome do as the romans do?

Must of the folks hear prefer the search option, I can apprecaite there is tons of info to digest and sometimes it seems like the info conflicts from one thread to another and kind of generating more questions then you started with. But bottom line either your going to go down a proven path (using someone elses setup) or starting from scratch. Me personally I'd prefer dialog to help me understand something if I have a question.

Do you attend any local rotary meets? Where else would you find a guy/gal more willing to talk about their setup

To get insulted and start shooting stuff back will most likely result in not getting any answers, granted costs of a project will never be the same for reasons such as what someone can do themselves versus paying someone else and where they may be able to source needed parts

Mind you I am not "one of the guys" just expressing my point of view. My money is on it will get the same response as when talk to the kids and wife lol

bottom line good luck with the build!
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Old Dec 30, 2010 | 03:57 PM
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looks unfinished ...... has it ran yet?
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Old Dec 30, 2010 | 03:57 PM
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Originally Posted by 13x
dude to take it personal is never going to end well.

Heard the phrase when in rome do as the romans do?

Must of the folks hear prefer the search option, I can apprecaite there is tons of info to digest and sometimes it seems like the info conflicts from one thread to another and kind of generating more questions then you started with. But bottom line either your going to go down a proven path (using someone elses setup) or starting from scratch. Me personally I'd prefer dialog to help me understand something if I have a question.

Do you attend any local rotary meets? Where else would you find a guy/gal more willing to talk about their setup

To get insulted and start shooting stuff back will most likely result in not getting any answers, granted costs of a project will never be the same for reasons such as what someone can do themselves versus paying someone else and where they may be able to source needed parts

Mind you I am not "one of the guys" just expressing my point of view. My money is on it will get the same response as when talk to the kids and wife lol

bottom line good luck with the build!
No I haven't attended any meets I just moved back to cali from indiana from school...so no I haven't...and yea I'm taking it personal because to talk **** when I'm asking a question is unneccessary...simply coulda been try to search....not we don't build 400 eBay turbo cars...that's disrespecting me and building...
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