VQ individual throttle bodies

I would say it's something only to be done after you've done every other possible mod. It's expensive and can be problematic. Ask Z1 maybe? I'm pretty sure I saw on the 350Z forums that they tried that and ended up going back to a Cosworth plenum or something.

Usually, I see it more often on naturally aspirated motors. That's after they've done everything else possible. If you're planning on boosting in the future, ITB's may not be the way to go.
 
shadow191 said:
I would say it's something only to be done after you've done every other possible mod. It's expensive and can be problematic. Ask Z1 maybe? I'm pretty sure I saw on the 350Z forums that they tried that and ended up going back to a Cosworth plenum or something.

Usually, I see it more often on naturally aspirated motors. That's after they've done everything else possible. If you're planning on boosting in the future, ITB's may not be the way to go.
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I don't think I've EVER seen ITB done on a car with FI.
 
Not sure I understand what I am looking at. Can you explain what the trumpet tubes are and how the airbox plays into it? Guess I'm just not getting how it works. I only see three throttle bodies, but are there supposed to be six?
 
The trumpet tubes are more appropriately referred to as velocity stacks. They work by creating a wide smooth transition for air to enter and speed up. This helps to cram more air into the cylinders on the intake stroke. It appears that they have created a velocity stack option and an air plenum option with ITBs.
 
So the velocity stacks are not filtered? Or does that airbox actually go over the trumpet tubes and provide only filtered air? It just doesn't look like the same design inside the airbox as on the other side. Do you cover each side with an airbox?
 
jumbosrule said:
So the velocity stacks are not filtered? Or does that airbox actually go over the trumpet tubes and provide only filtered air? It just doesn't look like the same design inside the airbox as on the other side. Do you cover each side with an airbox?
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The two sides are different designs. Left one is an open ITB setup w/o any filtering. Right one has an airbox on top that closes down. You can then use a filter on the front inlet. If you go with a boxed design, there'll be two airboxes.

The ITBs ditches the upper plenum altogether and replaces with those trumpets which work as extensions to the runners. For best results, I believe work has to be done on the heads & lower runners as well. As far as I know, these are rarely used and are not regular, trouble-free mods.
 
Thanks, Ege - it makes much more sense these are two different designs. It looks as if the airbox design ditches the trumpets for a different shaped velocity stack. But in the case of the trumpets, there is no filter?

I was sort of wondering if the throttle bodies could be deleted, and just extend the runners to the tubes in the airbox. There would now be two airboxes and two filters with two throttle bodies - one on each airbox inlet. It would be a new dual intake upper plenum.

Since it requires mods to the heads & runners - totally not worth it. It would be a really expensive experiment that wouldn't yield much in the way of gains, I'm guessing. But it could be the doorway to the new DUAL SUPERCHARGER!!! lol.
 
the dual air box design is cool , very similar to the HR motor ....

maybe 4 TB would be better lol

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jumbosrule said:
Thanks, Ege - it makes much more sense these are two different designs. It looks as if the airbox design ditches the trumpets for a different shaped velocity stack. But in the case of the trumpets, there is no filter?

I was sort of wondering if the throttle bodies could be deleted, and just extend the runners to the tubes in the airbox. There would now be two airboxes and two filters with two throttle bodies - one on each airbox inlet. It would be a new dual intake upper plenum.

Since it requires mods to the heads & runners - totally not worth it. It would be a really expensive experiment that wouldn't yield much in the way of gains, I'm guessing. But it could be the doorway to the new DUAL SUPERCHARGER!!! lol.
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You can't delete the throttle bodies otherwise you wouldn't be able to modulate the throttle and airflow.

ITB are typically done on NA highly built motors. They sound absolutely amazing and typically produce large power gains. The problem is, it is much more costly to build a high horsepower naturally-aspirated motor than it is to build a high horsepower FI motor. You'll typically polish and hone everything within the motor to increase the redline as well.

From the ITB motors i've seen, most do not use air filters. Again, these are typically dedicated track cars which don't see many miles on the road.
 
cambo said:
You can't delete the throttle bodies otherwise you wouldn't be able to modulate the throttle and airflow.
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If you read through his post he didn't mean to say delete them. It did come across as if he wanted a throttle-body-less design, which IS possible and IS done btw, but he mentions changing it from 6 throttle bodies (ITB) to just a dual throttle body setup like the HR motors.

The ability to run without a single throttle body is the one that amazes me. Nissan's VVEL can control the amount of air let in by varying the intake valve lift. That's insanely impressive... I believe they only include the traditional throttle body for vehicle inspection criteria or some bull crap? All I know is they don't need to have a throttle body.
 
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