Dual Throttle Bodies

[NVA-AV6]

Well, here are some pics of the next mani being made for this. Since I have to go up to get the extra plenum volume I need I decided to make a die set so I can press form some 2" tubing with horn ends to extend the runner legnth by a additional 1.75", figured might as well add some low tourqe to offset the additional flow for high end HP. So far the bottoms are formed and tacked together next to go after the top amnd sides, then the ends and connections for the TBs.









More to come as the mani takes shape.

[Rich01]

Holy crap That thing is turning into a beast.

Question, would you run a SC with this?

[NVA-AV6]

And some more update pics, unfortunatly probly wont get much time to work on this tomorrow.

[NVA-AV6]

Holy crap That thing is turning into a beast.

Question, would you run a SC with this?

No, the cost/benifit is not there with a SC, only na.

[timot_one]

What did you use to calculate the runner length/diameter and the plenum volume?  I've been wanting to learn more about intake manifold design to hopefully find something to replace the horrible manifold design that came with my M62 kit.

[NVA-AV6]

Alot of Gemoetry to figure out volume. Runner legnth is pretty stright forward mesuring.  As far as diameter of runners it is looking at the combined intake valve diameter and NOT going larger than that, you want velocity in the the runner, this also helps to atomize/mix the fuel. As far as plenum volume I am simply expecting that honda has done a pretty good job engineering and doubeling the volume since I am doubling the capable air flow.

[Accord Euro-R]

Pardon the potential nOOb-ness of this question as I am nowhere near the expert level on engines, but could you leave the entire thing simply looking like that?  Some of the 4-cyl cars I see at car shows look similar to that and have those rounded bezels coming out of each cyl for their air intake (see example below).  Obviously throw some screens/filters on but could it be done?  Looks nice IMO but just wondering...



Anywayz, back OT...still looks like an amazing project and cannot wait to see the final results.

[Icebox]

those cars you see at the shows have individual throttle bodies. the photo of pauls is just the manifold with no throttle bodies. i believe paul is trying to accomplish something similiar to itb's.  i think it would be very difficult to accomplish itb's on a v6.

[Rushzer0]

I think the new skylines have ITBS they are just covered by a plenum, there are also a few BMW's

[mschumacher]

I will be installing ITBs on my V6 once the manual trans swap is done. The mounting flange is really easy to do, which was the biggest problem for me on my Honda D series motors which had too much going on with the flange.

I will need a standalone ECU, so I will run either a Megasquirt or a Haltech ECU, depending on the funds available then.

Those velocity stacks you are talking about can be done on plenum single-TB style manifolds too, but they will be hidden unless you make a rice/baller manifold out of thick plexiglass lol.


With the Skylines, it is more difficult since they are turbocharged and need a proper plenum that won't explode/leak under boost lol.


It is all doable, just depends on how much money you want to spend and how much downtime you are ready for.

[NVA-AV6]

New manifold is done and results are promising, map readings look much better and I do not feel the low end tourqe loss. Fitment is much better, clearing the EGR valve. Even base idle is much better. More time on the road coming....


 Sorry about the video quality but it is with a cheaper camera and I had to do double duty driving and operating.

Rolling from the shoulder into traffic.


Rolling.


Dead stop to top of first. Love the puff as the throttles open up.


These are on a stock engine/ecu/exhaust(cored pre-cats)/AT.

[HEcreated487]

Wow, zero to 60 in 6-7 secs, for stock engine... seems good.  Love the sound.

[NVA-AV6]

Honda and others show an average 7.80sec 0-60, that was in the 6-7 sec range and was not full out.

[3.Slow6MT]

Come on...we know this mod is going to be great but a difference of 1 full second 0-60? That'd be a ridiculous gain and totally unfeasible for such a mod. The AT does 0-60 in the upper 6 second range stock. If this manifold decreased the 0-60 time by 0.2 seconds, that'd be a great and noticeable gain. Obviously that would mean the 0-100 time would be quicker by more than 0.2 seconds, resulting in a much faster 1/4 mile time as well. You can't expect this to decrease the 0-60 time by a second though lol. That'd translate to easily over a second in the 1/4, which is equivalent to a 100+hp gain.

[3.Slow6MT]

If I didn't just buy the 3.7 TL intake manifold/throttle body I'd be all over this as well.