bad 83

iTrader: (3)

Did any of you guys look at my build thread? I ran my stockport 12a Blowthrough at 12psi for 2 1/2 years. Once you start getting around the 300 rwhp mark, you will start splitting rear irons. I'll through this one in here too.

http://www.youtube.com/watch?v=8LnqZVvQWmo


YOU DECIDE

Twilightoptics

iTrader: (1)

Bad 83-

Did you still utilize some sort of vacuum advance for cruise timing for milage purposes?

What kind of milage did you knock off when driving conservatively with timing back down as such?

Thanks
-P

wwest2@stallions.abac.edu

not trying to be a problem here but how much money would this really save and will the nikki get close to the same performance as an aftermarket carb?

PercentSevenC

Well, considering a Holley will run you at least $250 and the manifold is nearly $300... plus then you still have to boost prep and tune the Holley anyway. That's over $500 saved right there. Weber setups are even more expensive.

When you're shoving compressed air through the carb, the nominal flow rate tends to not matter as much since you can cover for any deficiencies by just upping the boost.

tasty danish

iTrader: (5)

And even without boost, some have shown that with some mods (sterling, specifically) the nikki is absolutely as capable as some aftermarket carbs.

aragami78

iTrader: (3)

You suck bad 83 lol, I wish I had to make that decision every mornin.My names Randy not new to turbos just to turbo carb setups and had a quick question. Wondering if just any turbo will work or do the turbo II ones hold up to the exhaust better? Thinking about turboing my 12a, I have a few volvo turbos laying around, will one of these work? These are good for 10 psi, 7 with factory wg.

Verneuil

i think one of those will work. Heat really isnt a issue for turbos unless you no oil or water cooling them. depending how they are made they are both or oil cooled. now what about that? MAHAHAH FD3S stock twins. Slowly in the process of puttin those on my 12A FB. Little more work than i thought at first. But going Fuel Injection to make it work better. The ECU can possibly contorle the Trubos if i set it up right.

aragami78

iTrader: (3)

Thanks for the info Verneuil, dont know for sure yet If im going to turbo it, not really looking for any big numbers just want a nice factory like low boost setup. Didnt jdm 1st gens have a 12a carb turbo? Ill have to search around and find stuff on it but maybe I can just copy that setup.

Verneuil

They wernt carb. They had a simpe TBI fuel injection and they where a 6 port motor. This forum has a lot of info. A lot. If you browse around u will find anything and everything you wanna know, Or do, Or want to do to ur 7

PercentSevenC

No, there were 6-port 12As and there were 12A turbos. The 12A turbos were 4-port and EFI, the 6-ports were NA and had carbs.

81WideMariah

iTrader: (8)

Those turbos look a little to small on the turbine size.... Remember that rotaries have an extraordinary amount of exhaust flow when compared to a piston engine. Ideally you need something around a .96 AR turbine housing to prevent back pressure.

bad 83

iTrader: (3)

^^^^Not true. The stock TII turbos run a .89 AR. I run the S4 hot side on all my hybrid turbos. Here's the latest hybrid that I am putting together for my FB. It's a GT35R with a .70 AR cold side.



Current turbo TO4E on the right. The new GT35R on the left.





Mmmm. Tasty.

bad 83

iTrader: (3)

Here's some motivation for ya. The third car in the video is a bridgeport 12A, GT35R turbo, Mikuni 45 sidedraft.

http://www.youtube.com/watch?v=9Aj0kRIxxco

http://www.youtube.com/watch?v=6LCKGZEfk-E

Verneuil

Hope ur jokin around. If not ya got ur info way wrong lolz

Jeff20B

iTrader: (13)

Verneuil, how much do you really know about the 12A models that didn't make it to this country in a US-spec car? Just curious.

PercentSevenC

Sure, whatever you say.

aragami78

iTrader: (3)

Ok now im a bit confused lol, but its a good thing, makes me read up more on stuff myself which makes the info stick in my head. It is a rather small turbo, I beleive 48-54 like I said there only good for 10 psi which was perfect for stockish civics. So would yall say to just go grab myself one off a turbo II and rebuild it? Trying to get rid of all my civic crap and if these are going to have me at full boost to soon then ill just sell these to so I can beef up the FB funds lol. Thanks for the info guys.

Verneuil

Just from what I have gathered from this forum. The 12AT where TBI with 6 Ports. US where the 4 Port for the FB. If thats not right then do correct me.

81WideMariah

iTrader: (8)

Those turbos will be too small... you need to remember that rotaries operate similar to a 2 stroke they are constantly on a powerstroke. So even though the displacement of a 12a is only around 1.2 liters it is actually moving the same amount of airflow as an engine nearly triple it's size, which would be around 3.6L. Which is the same as a decent sized 6 cylinder. Add boost to the equation, which increases your volumetric efficiency, and all of a sudden you're flowing airflow numbers that are treading deep into V8 territory. That is why you need a large turbine housing, if the turbine housing is undersized then you will be choking the engine and cooking your turbo with back pressure, both of these would be a bad thing. To put it in perspective for you, a very popular upgrade for alot of the FC and FD guys is to run big Holset HX40 and HX45 turbos that come stock on Dodge Cummins diesel engines. Diesel engines will often see boost pressures as high 30 to 40 pounds, some even higher than that. While these turbos are definitely overkill for even a fairly well ported 12a it should give you an idea of what type of exhaust flow these engines are capable of. Long story short, look for a new turbo. You can find T2 turbos all day long for around $150, so there's really no reason to try to make one of those work.

aragami78

iTrader: (3)

Thank you 81WideMariah, that was exactly what I was needing to know, been reading up on it since I got all these diff answers. Will look for a turbo II down the line, need to have fun with it before I turbo it lol as well as go thru and replace all the hoses (80% done), and rebuild carb and omp new w.pump. So wont be anytime to soon, but this thing does feel kinda like a turbo would really wake it up. Again thanks for the spoon feeding 81WideMariah still learning my rotary ins and outs lol, had her almost 3 weeks sofar and loving it, later guys.

81WideMariah

iTrader: (8)

^^^ glad to hear you're enjoying the car.... keep reading, there is an incredible amount of knowledge on this forum, just don't take everything you hear from everyone as gospel.

Jeff20B

iTrader: (13)

https://www.rx7club.com/album.php?al...ictureid=12271