fcdrifter13

Well in my efforts to learn more and more, and find out interesting things here is my new view on it.

Well knowing that a cosmo upper intake flows better than a FD and a stock S5. The basic design reminded me of a Venom Honda intake mani. The main difference being where the TB is located, honda on the front and the cosmo on the side. Now match this up to a S5 turbo LIM and I think the flow characteristics would be preety good.

I am not planning on doing this I just thought it would be kinda fun to discuss. Taking us away from the usual questions. I searched and didnt find anything on it.

From what information I have the Venom intake was mainly designed for turbo applicatons and the throttle bodies you could choose from, to me look like they would out flow the stock s5 TB. But these are just my views on this. Also this combo would let you use the honda rails and FI setup. And I think the rails that are factory outflow the mazda ones, and if not there are other rails that outflow the stock ones. This would also let us change out fuel injectors without pull off the UIM.

I am not trying to say that the honda products are better I am just saying it could open up some options for tuning. But hey this is just my thinking and we all know how that goes.

fcdrifter13

Pics of the different UMIs

Maybe this was a bad thought

Skiles2070

I had a similar idea, I think that I will end up doing something like that, but I need more reserch and money to do that, I think if I were to go stand alone engine mang. and supercharge it with a vortech or something along those lines it would be possible, I just hate the way that the stock curves up and over the block, I will make something better mark my words!!!

Aaron Cake

iTrader: (1)

OK. But how many people are actually outflowing the stock intake manifold in any case? I made mine not because of flow but because the NA intake was not designed for radical porting, to greatly simplify the intake tract and for the experience. Anyone who is making more power then the stock intake can handle (600+) is probably going to be fabbing their own.

Aaron Cake

iTrader: (1)

I think you'll have a hard time beating the stock intake when dealing with a stock or street port application.

Curves do not necessarily equal restriction. There was some decent discussion in my last project thread where I covered the complete assembly of my custom upper intake manifold and plenum.

Edit....https://www.rx7club.com/forum/showthread.php?t=498432

rotorforce

I agree with you on the intake design.. There are numerous high horsepower rotaries utilizing the stock manifolds. If it's adding additional injectors your looking for, (primary fuel rail + 4 injectors on the venom mani) simply welding injector bungs onto the UIM and adding an additional inj. controller would be suffice. Again very high HP applications.

I think retro fitting the venom manifold (if at all possible)comes down to wanting to make the engine bay look nicer more so than function.

iceblue

I hope this is on a turbo. Aaron fooled with his 98% because he was boosting. Fooling with the dynamically engineered plenum of the NA is asking for a huge problem! The NA system was designed as a pressure wave to accommodate exactly with the port timing of the motor. Changing this will completely affect the VE of the motor. This is not as concerned in boosted applications as the boost will quickly over come any loss in VE.

The S5 and s4 tb are identical inside.

EDIT: The actual flow characteristics are much worse on the venom system then the stock Mazda intakes. Look at the dynamic chamber and the ports. That’s a nasty huge 90deg bend there. And on a NA I explained why this would be really bad.

Increased size is not always a good thing.

iceblue

I could make that manifold in like 3hrs. I mean look at it thats high school shop class.

Aaron Cake

iTrader: (1)

I agree. The Venom manifold has a very poorly placed throttle body. There's a reason that Mazda and most aftermarket intakes place the throttle body in the center of the plenum.