individual throttle bodies?

[nightshift]

does anyone make individual throttle bodies for the KA24DE? and is there any advantage to this?

[SSS]

No one that i know of makes ITB's for the DE, however here's a set that was fabricated and installed on an E:If tuned correctly, they are a valuable asset on a NA motor.

[nightshift]

if they are so good how come I didnt find anything when I searched, surely someone would have asked about it before hand . .whats the basic concept behind them? obviosly more air . . but I guess how does it work

[Rownan]

if they are so good how come I didnt find anything when I searched, surely someone would have asked about it before hand . .whats the basic concept behind them? obviosly more air . . but I guess how does it work

Well look at the damned runners on the thing. To make power in an engine, what do you need? More air, that's right. So by streamlining the intake runners you are able to get better acceleration of air and a more even distribution of air into the cylinders.

It isn't talked about much because it isn't just a casual mod, you have to custom fabricate something like that. I have toyed with the idea of a custom intake manifold such as this, but certainly not that extreme. Mine would involve some type of collector on the end.

Timhttp://www.projectaspec.com

[nightshift]

It isn't talked about much because it isn't just a casual mod, you have to custom fabricate something like that. I have toyed with the idea of a custom intake manifold such as this, but certainly not that extreme. Mine would involve some type of collector on the end.

Timhttp://www.projectaspec.com

Well neither is that prototype engine a few post down but they are still talking about it . . .

[Jays90240SX]

Is it just me, or does he have 2 fuel rails there?

also, would there be a kit or something that would allow someone to fabricate this a little easier? You know, like a car with ITB's that you can chop off and adapt to the stock manifold?

[S13Ka24e]

SSS - what are you using for engine managment now that you no longer are using the MAF?

edit - you didn't say it was your car i just assumed, so if it is not your car do you know what he is running for engine managment?

[Dorifto-King]

With the 4 seperate throttle bodies, would that engine be able to rev higher, because of the increased air intake?

i think i remember reading another thread about this, and someone wrote that there was a company that apparently specialized in this. if i find it again i'll post a link to it for ya.

[TrunkMonkey]

i think i remember reading another thread about this, and someone wrote that there was a company that apparently specialized in this.

TWM Induction

the same ITBs used on the E pictured above can be used on the DE. it's easier to do on the E because there is already a manifold offered by nissan motorsports that the throttle bodies will mount to. you will have to fabricate one for the DE.

that car belongs to freshalloy member allmotorKA. if you do a search by username on that forum, most of your questions can be answered.

-demetrius

[SSS]

No, as demcj said, it's allmotorKA's car. I am looking into this setup for my KA24E. I assume a fuel computer would be all that's required in tems of management?

[Nif]

Having worked with engines that have ITB's for quite a while now I can say that they are quite good but not only for the reasons that most people assume.

Lets say that you have two nearly identical engines. The only difference is that one has a single throttle before the plenum (engine A), the other has ITB's just upstream the injestors (engine B). They are given the same runner length and cross section, same plenum shape and volume.

Engine A will have a bit smoother flow path in the runner where flow is more critical than anywhere else. This will allow it to have a slight edge on the top end. Engine B will have much better throttle response due to the greatly shortened distance to the valve head. Coincedently Engine B will see a little better fuel atomization due to the more turbulant air at the injector.

Many people think that with ITB's it the flow that is the advantage, thats not wholely true. It seems that most people who have installed ITB's on a single throttle car also went with a bit larger runner/throttle combo. The larger cross section along with the shortened throttle plate to intake valve distance allows you more high rpm flow (hp) and seemingly better throttle response. This tricks people into thinking that "ITB's flow better and make more power.

Having said that when I was looking a building my KA, ITB's were high on my list, if done properly on a motor intended for street to medium track duty the results could be quite pleasing. I'll shut up now thanks.

[Dorifto-King]

So "This Will Allow it to have a slight egde at the top end", does that mean it will rev higher?

[Nif]

No, the single throttle set-up in my example will have a upper end edge, but this is with eveything being otherwise the same. The main reason that people like Nissan, BMW, etc. have used ITB's on there higher performance engines is to increase throttle response. That being said a properly designed ITB set-up could be really nice on an all motor ka24de (or turbo motor).

[nightshift]

NIF that is the single most informative response Ive ever gotten on this board when I asked a question. Thanx

More Info please people. . . you can never have enough

Another Question I recently bought a Silvia Carboy book . . and noticed that Tomei makes ITBs for the RWD SR20DE the engine looks very similar to the KA24DE would these fit at all even if it might take some modification or not worth it?

[Kinesthesia]

"That being said a properly designed ITB set-up could be really nice on an all motor ka24de (or turbo motor)."

Just out of curiousity ? how could you use ITB's with a turbo motor ? I've never seen that done.

[Nif]

Give me a link with pictures. I never have seen an ITB set-up that I truly liked. Never did a whole lot of reaserch on it either as soon after I made the decision to get godzilla(but then I guess I did find an ITB that I liked). Think also about the GTiR but one thing I would suggest is getting "unattached throttles" as I think they would be a bit easier to adapt into a custom manifold.

[nightshift]

heres a link to the tomei site. . . the ones I saw were in a book and much bigger better pictures though

http://www.tomei-p.co.jp/_2003....html

[Nif]

"That being said a properly designed ITB set-up could be really nice on an all motor ka24de (or turbo motor)."

Just out of curiousity ? how could you use ITB's with a turbo motor ? I've never seen that done.

If you've seen a GTR motor you've seen a turbo motor with ITB's. I feel that n/a or turbo you should have a plenum before the throttles you should also have some velocity stacks much like the one's tomei uses. On our Sub-Zero manifolds for the rb's we have a design similar to tomei's.

[Jays90240SX]

The only thing would be to figure out a cost effective engine management.

Since you can't use the MAF no more.

Unless you have a plenum on top of the ITB's, then you can still use the MAF.

What do you guys think? I'm guessing going with something like SDS, Haltech, Electromotive would be a must for this?

[Nif]

Ah, the other thing that crossed my mind engine management. Why couldn't you take the coil on plug set up from the sr20 and adapt it to the ka. Seems to me that with a little machine work this could be a doable thing. Then something like a power fc would be easier to get. Also don't forget about the Microtec stand alone. Nice piece.

On the manifold side of things I would certainly have a plenum and the MAF even Indy cars use an air filter. This will also allow for a cooler intake air temp which will mean more power less chance for detonation and better fuel economy.

[Jays90240SX]

YEah, so we can use the stock electronics if we use a plenum, maybe just a re-tuned ECU from JWT, or get that Techtom chip. But if using the MAF still, that would work.

Wonder how just a ITB setup like that would cost!?