NIssan had applied this technology(ITB) on Pulsar GGTIR (SR20DET one) and GTR,but it was unsucessful.Most of the GTR tuner remove it when over 800hp.

 

There are plenty of reasons... the simple way works fine till whatever power you want and costs $500-$750. 4 throttlebodies, a way to make the tps to read right, a way to wire all them together, etc, etc... not gonna be anywhere near $500 to say the least. On top of that, you are going to want to get very nice throttlebodies so that when they are open they barely rescrict the flow... the good way to do that is use an eccentric tube so when you open the throttle it opens the circle all the way with no restrictions. Much like the throttle on a gas powered rc car works.

 

Can't wait for the final product and results!

 

Why not use a design much like an exhaust header. Equal length runners leading to a throttle body located on the top center of the manifold? Kinda like my high speed rendering here that i made on my super computer

 

barrel throttles usually only work well at wot tho right... they don't exactly work well partially open.

i have a question. why do most intake manis have hte velocity stacks and carry a volume that scoops well under the stacks. i noticed that the magnus (prolly not well engineered) was one of the only inmanis that had the tank end right at the velocity stacks.

 

My guess is it has been something that has been copied from other intake manifolds like Hondas where space was an issue. Its much easier to make the runners longer by shoving them deeper into the plenum than it would be to make intricate bends. Bending sheetmetal tubes would become very difficult. Thats my guess.

And the barrel throttle I think if designed properly should be fine for part throttle. They use them on Indycars I believe which arent always at WOT. At any rate, doing anything with modifying the throttle body would be a pita and probably not worth it.

And as to why I didnt make the throttlebody in the center which would be preferable is because of the space issue. Think of your intake manifold and now try to put your throttlebody behind it. Now try to fit a 2.5" or 3" pipe coming out the back of it.... you would need to run the piping through the firewall to make it fit

 

This is the best topic ever! keep up the good work!!

 

Have you covered any more ground on the road to pruduction?

 

Well I made another version for DSMs. Specifically highly modified ones for cars up to Sheps (extremely large throttlebodies, very high revs and big turbos). I talked with my 3D printer so I am all set with everything. I just need to print up a few mock ones out of paper and make sure all the manifolds fit correctly before getting them casted. The DSM version may require some modifications... I dont have a stock DSM anymore but I dont believe there would be much in the way even if it was stock. The Evo version has VERY tight clearances. Specifically near the top of the alternator and the ABS unit.

I will most likely be needing to make some sort of a group buy for the Evo version to help cover the cost of the initial final production versions but Ill see how it goes. The DSM version I believe I have enough people that want them that I can afford to get those ones off right away.

I will post up pics of 3D renderings that look close to real once I am all set with everything. I should be able to post the pics up by Friday of both manifolds and probably post pics of the plastic 3D versions by early next week.

 

Good luck. Also, you're casting them? If in fact you move ahead with the project, is a sheet metal version possible? I know the design itself will yield the performance gains, but somehing is to be said of the exclusivity of a nice welded manifold.

 

It would be extremely difficult to get all the angles correct using sheetmetal but it could be done I suppose.

I will also probably talk with some locals here about getting it coated on the inside (And outside) to make it as smooth as possible. Not sure if that will pan out or not though. Powdercoating the outside is very easy for us to do so that could be an option if people want it.

One good thing about having it cast is the pressure it can take. It would live through any backfires and most likely even nitrous backfires. It also made it so we can put heatsinks on it in various places to help keep the intake temps down.

 

That sounds great. As long as it fits between the head and the firewall you should be fine with the DSM unit. Have you put much thought into pricing? I'm looking forward to seeing the unit

 

I think I look forward to these updates more than "nudie magazine day"! Seriously though TrinaBabe, congratulations on taking this project all the way. Let me know about pricing as this would be one of those save for a rainy day projects

 

I'm so jealous...I don't get to use the CFD at the windtunnel that I work at...it sucks...so for my projects to be flowed they are put on a back burner...quicker for me to build it and flowbench it at our engine lab...

 

how do you calculate plenum sizes?