Greetings!

My problem here in Slovenia is that there is no one to ask for any advice, because there ain’t no cars like these here and if they are, they are stock... So I turn to you with this question:

I’ve decided to install a nitrous system kit. I’ve looked over a few catalogs and found a suitable kit for my car from NX. It’s called NX Holley Gemini Twin stage 6 (50-300HP). In case anything should not be suitable, I wrote an email to NX asking if this kit is suitable. The answer was this:

"With a high-end plate system, a competition-style, single-plane, square-flange intake like an Edelbrock Victor, Holley Strip Dominator, or Dart is recommended. A dual-plane's two different plenum floor heights, center divider, and unequal runner lengths makes it difficult if not impossible to achieve optimum spray pattern distribution, particularly at over-200hp power-levels. You need to be able to see all eight ports with the bars for optimum
distribution"

It looks like I’ll have to replace my intake manifold. When I reviewed some data regarding single plane manifolds I noticed that most of them have operating range at 3500rpm and above. The problem is that my engine is designed to work between 1800 and 6000rpm. I need to know how will my engine go along with such manifold and how will it behave under 3500rpm? I like Edelbrock Victor Jr. series or Edelbrock Super Victor series the most.

I also found 2 models from Weiand that have lower range powerband (Weiand 7532 -> 2.800 - 7200 RPM and Weiand X-Celerator 7546 -> 1500-6000 RPM).

Which single plane intake manifold do you recommend for my engine configuration?


My engine configuration is as follows:

Engine:

Chevy SB 383 stroker, Edelbrock RPM AirGap dual plane intake manifold, Dart Iron Eagle Heads with int:2.02 exh:1.60, roller rockers 1.5:1 ratio, carb Mighty Demon 825, Cam: CompCams Extreme Energy XE274H (duration @050: in:230, ex:236, lift in:.490, ex:.490), full length Hooker Headers, HEI ignition, forget pistons, forget crank, forget connection rods...

Tranny: TH-350 with TCI Master Racing Overhaul kit, B&M transpak shift and Adjustable Transmission Modulator Valve, B&M Holeshot 2400 Torque Converter

Rear end: GM 10 bolt, 3.23 gear ratio, Auburn gear Pro series LSD


Looking forward to your kind answers and thank you for your time...


_BANDIT_

 

Use a Weiand Team-G. There are multiple versions. You want the WND-7530 in the Summit catalog. The 7532 you mentioned is actually a different version.

http://store.summitracing.com/partdetail.asp?part=WND%2D7530&N=115&autoview=sku]WND-7530


The nitrous plate you will be using will act as the spacer Weiand suggest for use with an auto tranny.

The manifoild also has bosses for direct port if you ever want to use that option.

And don't be fooled by the 2800rpm statement. The Team-G makes great low end power. It's like it doesn't know it's a single plane.


BTW, that's based on both personal experience and dyno testing that I've seen.

 

Thank you for your kind advice. Now I can't decide wheather to go to a single plane and plate Nitrous system OR to buy a Direct port nitrous and use my current intake.
This direct port is concerning me a bit, because there is quite a lot of different bolts&cables and stuff around the carb and there's also a lot of work with changing injectors. I also think that this may upper the risk of malfunction, because It's hard to see if all the injectors are working properly. If one fails it can lead to a cylinder damage...

What do you suggest?

_BANDIT_

 

\
I suggest that since the manifold gives you both options that you follow your original plan, get comfortable with it and IF YOU FEEL LIKE IT, add a direct setup later, making it a two-stage system.

 

LameRandomName,

Out of curiousity, how much machining is required to make the intake work.

Not trying to take over a thread or anything because I think both Bandit and I could use this info.

 

I assume you mean maching to make it fit a GenII block...?

Same as any other manifold conversion.

I don't know the details in terms of time, money or specifications; but I do know there have been a lot of threads on this subject.

 

Just spray the Performer RPM an watch your plugs closely for uneven fuel distribution. You shouldn't have ant trouble, I spay 250 on a RPM manifold over a 350cuin. in my Nova. It runs great!! The RPM is a fairly big dual plane an it will handle a lot more than other dual planes.