ok. heres the question. has anyone hooked up a 12a nitrous system? i've got a 12a race ported, clearanced rotors, high volume fuel pump, holley 600 set up, racing beat exhaust system, dlifs. looking into using the holley plate to shoot the nitrous. is that plate good for rotaries? i would think you need to shoot into the secondaries only at an even pace. does the plate shoot evenly across both of the intakes? or am i going to have to plumb into my own plate so it shoots evenly?
thanks

 

I have nitrous on my streetport 12a. I am using the NOS top shot module which injects nitrous and gas into the carb venturies. It works alright, and makes a good boost, but I would reccommend going to a nozzle in each of the secondary runners. This does require drilling your manifold, which the top shot does not, but I am going to convert to fogger nozzles. This ensures more consistent performance and makes sure all the nitrous and gas gets into the engine.
I am only running a 50 hp shot for now, but will upgrade to 75 soon when I can get some tuning done. Right now the setup is too rich.

 

I will let you know next week, just need to mount the bottle and run the line to it. This is currently on the 12A bridge with the Holley, but I am tempted to do a blow through and make it REAL nasty.

This will be my first experience with nitrous, I am not very optimistic about the result or how long the motor will last. We shall see.

 

cool. so are you useing the plate system?

 

just a question for you guys with the holley nitro plates. How thick is the actual plate? I want to make something similar for a webber but i dont know what sort of thickness i need. If i can make a plate easy and set the jets in it, ill go the whole 12a BP nitro.

Cheers
-James

 

The plate is pretty thin, maybe a little over half an inch. Much smaller than the spacers they sell, had to get different bolts to not run into the linkage on the carb after switching.

I can try to take a picture of it on Monday if you like.

 

Are you talking about your '80? I've gotta see that car some time.

 

I'm confused, how do you use a plate system when the rb holley intake has 4 separate runners? The plate injects the nitrous and gas in the center of the plate where there is material. Give us a hint or a pic of how that works.

 

NOS foggers in the intake manifold is a better choice for a rotary.

 

thats exactly what i was thinking. thats why i made this post is to see if anybody has used the plate before before i buy. so i wanna know how the plate injects. i've heard that it sprays at multiple angles. but will those angles be sufficiant? or should i just tap into the secondary intake manifold? think that would be more logical, yet more (precise) work. and if i screw up....... well, thats a good amount of money. but yeah, the 80 will be sweet with a shot of n2o!.

 

BUMP!



I need this question answerd ASAP.



--Alex

 

each runner will have one. this is what I installed on a RX-2.

 

So a universal Holley plate system will not work on a RB manifold? The jets must be tapped into the intake runners? If the later is true, how is the extra fuel delivered?


I really need to know, I'm about to click "buy it now" and don't wanna buy the wrong thing.


That is a beautifull setup btw wacky.

 

you have to use a distribution block. the kit usually comes with it. one for fuel and one for nos. to get a better idea, do a search on yahoo and you will find something like these. and if you wanna cheat, pm me.

 

For what it's worth, just run a twin wet fogger setup (one per rotor). NO need for a plate. The foggers are a lot better in my opinion. Although it does entail drilling and tapping the intake manifold. Contact NOS for jetting requirements based on fuel pressure.

I've ran NOS on many rotaries, and I only used fogger setups for proper metering.

Start w/ a 50 shot and tune it. Then move up to a 75 shot by re-jetting it. Depending on engine mods I'd say 100 shot is the largest that is safe w/o big engine mods.

Get some sort of ignition enhancement too, as it will really help out at higher rpms with the NOS.......trust me.

Good luck.


Keith

 

^Thanks,


My motor should be pretty stout (1k mi) and I was wanting a 100 shot.

I just liked the simplicity of the plate systems.

--Alex

 

I run a 150 shot into my 13B bridge-port, through a Nitrous Express Hitman plate system. The system works great. Very easy to install. Jetting can easily be changed within minutes to go 100-150-200 shot. The plate system is the only thing that I would recommend. I run my activation switch off of the secondary cam on the carb. The RB Holley 650 has to be at full throttle to activate.

 

what 1/4 mile times are you guys getting with a 12a on nitrous?

 

I had a Weber 48IDF on my 12abp. I ran one fogger nozzle in each runner and it ran pretty good. I had it jetted for a 100 shot with 20 degrees advance leading on the unit and no trailing spark at all (plugs in the housing, but no wires attatched). 91 octane mixed with 110 octane. It ran pretty strong, and was a strong kick in the pants. I am now in the process of switching over to a RB manifold with a Holley 600 double pumper and a NOS plate kit. I am porting the RB mani to have a plenum so it wont have a mixture problem when using the nitrous plate. The plate is a much simpler device, and I hope it makes tuning less of a pain. Plus, buying two jets to up the shot is much cheaper than buying 8 jets to up the shot.
Im sure they will both work, its all just on how you want to get the job done. I only ran the fogger with the Weber because they didnt make a plate for the Weber. When running a Holley, I dont know why your first choice wouldnt be to just run a simple plate kit.

 

You will be using their standard V8 Holley plate then?

Could you please explain what all you're going to have done to the manifold.




Thanks,

--Alex

 

If you are using a plate system this is what the top of your intake should look like http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW

 

Thank you, I can do that. to give it more room to mix ehh.............

 

I know this thread is a bit old but I wanted an update on the effects of long term NOS use on a 12a or a 13b.