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Epic red turbo 12a build

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Old May 6, 2026 | 09:05 PM
  #126  
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Got an afr gauge, no guessing anytime soon
Got an afr gauge, no guessing anytime soon
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Old May 7, 2026 | 03:48 PM
  #127  
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I installed the steering collum. I turned the wheels all the way one way and put the steering wheel rack gear all the way out then straightened the wheel. But now my steering wheel goes almost a full turn either direction before the wheels move, and the steering wheel moves in and out. Is there an adjustment for this. Or maybe the bearing fell out. It was fine before and I didn't move the big jam nut on the shaft. Any ideas?
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Old May 7, 2026 | 03:56 PM
  #128  
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Nvm
It was the bearing
It was the bearing
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Old May 7, 2026 | 07:24 PM
  #129  
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Originally Posted by Badfighterpilot
I was planning on making a turbo style exhaust and just atatching it to the stock manifold and downpipe, what do you mean by whirly. ive only tuned an edelbrock, where is there a good thread to learn about how a nikki works.
I suppose I could spend the money on the disassembled rb header sincd its not too expensive.

Whirly AKA turbo.


Edelbrock's are easy to tune, all you need is a vacuum gauge (TBH all you need in the automotive industry is a vacuum gauge). Nikki isn't so hard but its a bit more involved, and that wideband you got there will help a lot. Edelbrock carbs use vacuum to determine transition were nikkis use air passage. Under WOT fuel jets combine with emulsion tubes dictate fuel delivery.




Took me a while to find it.

hogged out vs boost prepped (Nikki) - RX7Club.com - Mazda RX7 Forum

Gobbs of info in that thread. I'll do a quick re-read of it to make sure but I think thats the thread you should be after.
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Old May 7, 2026 | 07:32 PM
  #130  
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Originally Posted by Qingdao
Whirly AKA turbo.


Edelbrock's are easy to tune, all you need is a vacuum gauge (TBH all you need in the automotive industry is a vacuum gauge). Nikki isn't so hard but its a bit more involved, and that wideband you got there will help a lot. Edelbrock carbs use vacuum to determine transition were nikkis use air passage. Under WOT fuel jets combine with emulsion tubes dictate fuel delivery.




Took me a while to find it.

hogged out vs boost prepped (Nikki) - RX7Club.com - Mazda RX7 Forum

Gobbs of info in that thread. I'll do a quick re-read of it to make sure but I think thats the thread you should be after.
I guess that awnsers your question

Last edited by Badfighterpilot; May 7, 2026 at 07:37 PM.
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Old May 7, 2026 | 07:45 PM
  #131  
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Would i just follow His sticky thread or are there any things that are different to Na because from a quick overview it looked like he was talking about only boosted engines
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Old May 7, 2026 | 07:51 PM
  #132  
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Oh, and I ordered exhaust pipe so probably only driving it once if that.
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Old May 7, 2026 | 11:31 PM
  #133  
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I think I'll just leave the carb stock, and freshen it up. No point putting a bunch of time when it won't last long
edit: the turbo should be this fall/winter when the weather gets bad.

Last edited by Badfighterpilot; May 7, 2026 at 11:35 PM.
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Old May 8, 2026 | 12:40 PM
  #134  
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Getting dash ready for paint
Getting dash ready for paint
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Old May 8, 2026 | 08:25 PM
  #135  
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Is this the vent valve im supposed to delete

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Old May 8, 2026 | 08:41 PM
  #136  
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Originally Posted by Badfighterpilot
I think I'll just leave the carb stock, and freshen it up. No point putting a bunch of time when it won't last long
edit: the turbo should be this fall/winter when the weather gets bad.
The car should drive fine with an undersized carb. The carb is only going to deliver the air/fuel it can. The engine is just capable of sucking more air/fuel than it can handle.

For what its worth the major problem most people run into with carbs is going too big. I want to believe thats why carbs get such a bad wrap. "I put a 1050cfm carb on my SBC 350... now it doesn't run well. Must be carburation is bad"


You can strip a whole lot off of the nikki. That vent valve doesn't look useful for your purposes. I don't think your vacuum system is going to work properly even if it was all functional. You did bridge port the engine so vacuum is not your friend.


I would definitely recommend switching the carb over to mechanical secondaries. While the vacuum operated secondaries are very good. It takes some vacuum signal that I don't think you're gonna get with your engine. Just when you go to drive it wait until you hit 3 or 4 k RPMs before opening the secondaries up.
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Old May 8, 2026 | 08:48 PM
  #137  
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Originally Posted by Badfighterpilot
Is this the vent valve im supposed to delete
Originally Posted by Qingdao
The car should drive fine with an undersized carb. The carb is only going to deliver the air/fuel it can. The engine is just capable of sucking more air/fuel than it can handle.

For what its worth the major problem most people run into with carbs is going too big. I want to believe thats why carbs get such a bad wrap. "I put a 1050cfm carb on my SBC 350... now it doesn't run well. Must be carburation is bad"


You can strip a whole lot off of the nikki. That vent valve doesn't look useful for your purposes. I don't think your vacuum system is going to work properly even if it was all functional. You did bridge port the engine so vacuum is not your friend.


I would definitely recommend switching the carb over to mechanical secondaries. While the vacuum operated secondaries are very good. It takes some vacuum signal that I don't think you're gonna get with your engine. Just when you go to drive it wait until you hit 3 or 4 k RPMs before opening the secondaries up.
Good to know. Thats the only part left on my carb. Would i be able to remove the secondaries vacuum can with mechanicals
i made this hog. Yes the welds are bad but it was a quick and dirty fluxcore situation. Im going to tig the rest of it.

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Old May 9, 2026 | 11:09 PM
  #138  
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Hey. My carb is absolutely blasting fuel everywhere and it comes out the vent. even if i set it at less than 1 psi at the gauge. Is it probably the float level? I didn't check it when I rebuilt it, I figured it was factory.
also it does it less on rearward side of the carb.
I used the stock needles and seats

Last edited by Badfighterpilot; May 9, 2026 at 11:34 PM.
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Old May 10, 2026 | 06:02 PM
  #139  
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The floats were set at like 12mm so I fixed that no more leaking
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Old May 10, 2026 | 09:02 PM
  #140  
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Got it running pretty decent. I think the idle is lean, pretty eye watering. Leaking water everywhere even with the new gaskets. Also the engine bay is getting pretty ugly I'll have to finger something out that isnt very expensive.
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Old May 11, 2026 | 04:28 PM
  #141  
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Originally Posted by Badfighterpilot
Good to know. Thats the only part left on my carb. Would i be able to remove the secondaries vacuum can with mechanicals
i made this hog. Yes the welds are bad but it was a quick and dirty fluxcore situation. Im going to tig the rest of it.
Just wire (or weld) the little secondary shaft arm to the primary. I don't know how to word that, but if you look at the side of the carb it should be obvious.


My guy is that gonna dump strait off the header?!? You are a mad man, and soon a deaf man.

Or are you plumbing that into a full exhaust?
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Old May 11, 2026 | 05:17 PM
  #142  
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Originally Posted by Qingdao
Just wire (or weld) the little secondary shaft arm to the primary. I don't know how to word that, but if you look at the side of the carb it should be obvious.


My guy is that gonna dump strait off the header?!? You are a mad man, and soon a deaf man.

Or are you plumbing that into a full exhaust?
haha yeah she's louder than a header dump v8 with that exhaust port. Im putting a full exhaust, but it will be straight pipes till I decide on a muffler. Probably racing beat presilencer they sound pretty good
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Old May 11, 2026 | 11:04 PM
  #143  
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Got the brakes bleed, and steering installed. All the wiring is very confusing . My coolant temp isnt working, but i think the sensor isnt grounding because of thread tape? And my steering wheel won't go on so I have to figure that out. Also my steering box is very noisy, does it need adjusted?
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Old May 12, 2026 | 02:06 PM
  #144  
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I just seen jdl has a 12a lower intake for fuel injection. I think ill probably go with that.
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Old May 13, 2026 | 01:11 PM
  #145  
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The dash turned out really good


edit: i found in my parts stash a full bolt in power window setup, and a few pieces i need, so i should have a full interior except big piece that surrounds the radio and shifter
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Old May 13, 2026 | 03:31 PM
  #146  
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That looks great.

You should check in the forum for the other parts, surround for the shifter and the upper panel, there was some effort to 3D print.

Edit: here you go

https://www.rx7club.com/1st-generation-specific-1979-1985-18/fb-complete-center-console-scan-3dp-1172266/

Last edited by Toruki; May 13, 2026 at 03:33 PM.
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Old May 13, 2026 | 10:30 PM
  #147  
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Did you paint your dash too?
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Old May 14, 2026 | 01:58 PM
  #148  
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Originally Posted by Banzai
Did you paint your dash too?
yes its SEM color coat from a spray gun
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