Most threads dealing with setting up a blow thru system on a 12a use a side draft carb such as a Weber DCOE. Has anyone experience of setting up a system using a Nikki or Weber 48IDA

 

I want to know, too...I've got two turbos off of a 300ZX that need a home...

 

Place them in the garbage. Or E'bay em. You already know they are too small.

 

I have a turbocharged 12a with a Nikki. I had the work done by rotaryshack.com he did an excellent job. He had to pull a bunch of **** off like the decelration controls......and jbweld most everything... I'll get some pics up here soon

T.J.

 

Please tell me he didn't say JBweld...

 

You have something against JB Weld Mar3?

~T.J.

 

What's wrong with JB weld?

T.J.

 

Will the Nikki support a bridgeport?

 

I have an IDF, which is like an IDA but smaller.

To my knowledge I do not know anyone that blows through an IDA or sells a kit for one.

 

Stock, no way in hell. It will only flow enough for 145hp.

Modded, I don't know. I know it can be made to flow enough for a large streetport, depending on how much work is done to it.

 

dude, just get rid of the nikki if you are going to go turbo.

 

680rwhp12a- well now 726hp I think. He is using a modified Nikki carb. I have no clue how he gets that much hp.

T.J.

 

A modified Nikki will support a NA system to about 220hp. A good bridgeport should put out more so its normal to upgrade to somethind with the same flow capacity as a Weber 48 or 51.

The requirements for a turbo system are different and as yet I have no knowledge of using a Nikki, is there an airfow limitation or is it the design configuration which prevents designing an inlet system.

Most of the carb blow-thru set-ups I have seen have a swan neck manifold going over the top of the engine to a carb like a Weber DCOE or Delorttos. I would prefer a 4 barrel such as the Nikki.

 

4 barrel such as a nikki? why not get a holley. theres plenty of documentation on blow thru holley setups in the piston world so it shouldnt be too hard. thats what i am doing as soon as i get the rest of my car sorted out first. would like it to steer and stop and all before i make it ***** fast

 

Turbo with a Holley would be 100 times easier and more reliable for HP gain then a Nikki,

Buy a RB header flange, have someone to make you a turbo manifold with it and use the same flange on what turbo you plan on using,Most people around FL that ive seen charge $300-$400. for the Turbo custom manifold.

Get a FMIC and a Hat for the Carb,Turbonetics makes 2 of them,B&M makes one,K&N makes one,Some of these items are not on thier web sites you have to ask for them,

BUT im pretty sure what ever carb you use you woulod need it to be built to accept mass flow of forced air,Im not sure whats all involed I just know theres a guy like 45 mins from me thats one of the best in the bayarea he specialize in building carbs for rotaries.

Of course when you do all of this you would need higer PSI of fuel,i heard some peopel say the Holley blue ifs ok BUT my feeling is tring to get something like a universal inline Walbro,and a FPR that can handel the high pressures from a FI car.I wanted to run the Aeromotive pump ..its like $275. or $300. range

If you plan on running a Turbo dont waste yoru time on junk yard junk UNLESS its like a T60 or bigger,Even if you port out your engine alot of the T25 or T3 will be minumal gain but still around the 300 hp mark.

T60 around 600 hp ..

I found a company online that sells T61 for $695.

Im still debating on getting something like this for my 10AE or just hybriding the stock turbo so I dont have to buy a new manifold etc etc..

 

That's not how a professional shop is supposed to close holes, rethread or repair metal structures....go out and take a screwdriver and peck at it a little and you'll see why....it's meant for the hobbyist or the lazy..................................



And yes, I used to use the stuff...not anymore....

 

Bum......are you actually tring to tell me that a 300 ZX turbo cannot feed one rotor housing? I'm not talking sequential. I'm talking two turbos, one for each rotor independent of eachother...outputs of the turbos would be combined before the IC...I'm hurt you didn't pop a graphic on me this time around... ..........................bum

 

SoRRoW- thanks for the advice.

Regardless of which carb I use, the turbo will be a Garrett TO4E/60. enough boost for about 450rwhp, using a front mounted intercooler and a Bosch Fuel pump with upgraded lines.

The best write up on the forum on thissubject is by Moremazda under the thread title 12a Turbo Write Up.

My first turbo installation was 30 years ago using Webers on a Lotus 47, we learnt from expensive mistakes particularily on charge air temperatures!

The question is whether a Nikki carb set-up has limitations or problems including height clearance. A historical question is what carb would Mazda have used in 1982 for the 12at if they had not gone efi.

 

I say ditch the carb and go injection. Buy an adapter plate and use a TII intake manifold, or get an IDA manifold and an intake from Injection Perfection or someplace similar. Injection is where it's at dude.

 

sigh...He's asking about the Nikki for a reason, not to hear about other options....he knows there's other options, he's been around the block a few times, some of it racing....basically, no one on this Forum knows the answer, that's what it comes down to....where the heck is the psychopathic J-I-B when you need a good Nikki answer??

 

i think the nikki will work good, the bigest complaint i get is its hard to start and a bog when the secondaries first open... beware though its a tricky carb to blow through ,,,, you better have lots of bloe through experience to try it! its a tight fit to clear under the hood, you have to cut the hood inner support to clear or slot the engine mount to drop it down a little....

p/s all of Corky Bell's blow through kits used J-B weld with great success!!!! if you know how to use it it works great!!!

 

680rwhp- thanks that' s very useful information, I was worried whether the Nikki would clear the hood. The stutter on the secondaries is obviousy important especially if they are already mechanically linked as in most modified Nikkis.

Why I was interested was a historical question, if Mazda decided to turbo a 12a in 1982 without going to efi what carb would they have used, would it be a down draft Nikki or a side draft? At that stage Mazda had already spent 5 years trying to develop a reliable efi system and the production of the 12at was a technical gamble.

ST-13BT, I agree efi has advantages over a carb set-up but what I am looking at is the design and rebuilding of a 1982-85 12a high performance set-up. With modern knowledge and technology its possible to build a street 500rwhp engine, compared with this the factory race 12a in 1982 was only producing about 250rwhp. The potential of a rotary was far in advance of the availability of electronic components.

 

that stuffs holding half my radiator up! and;
stoped a leak in my oil cooler, for about a week..

 

Ok question, I want to incorporate the choke back into my 12at with Nikki. Any suggestions on how I would do this???

 

construct a plate and rod out of JBweld....