Anyone thought of ITB's with 89-94 Maxima Dual TB's?

[RedPhoenix]

I went to the local Junkyard and saw the 89-94 Maximas have a dual TB setup. I grabbed one and currently its being cleaned... but I was thinking 4 of these for an ITB setup connected to the lower intake manifold?

I would think it would be pretty easy to adapt because of the position of the lower intake manifold. Its grouped in sets of 2 runners like the Maxima TB.

How would you adapt the TPS? Its a different style.

Thoughts?

 

[JustenGT8]

No point...lower manifold is the problem so will look cool and sound sweet but deliver bugger all gains for the effort.

Put these on your own short runner manifold with ported heads and cams and then you have a setup worth considering

 

[Cobber]

Something like this.

http://www.efihardware.com/products/1603/manifold-Toyota-4.0-Lexus

Just get the complete kit instead of old stuff.

 

[Jake Breyck]

matt you just gave me a product idea. youll love this. but youll need your car map ;-)

 

[stormtrooper]

Something like this.

http://www.efihardware.com/products/1603/manifold-Toyota-4.0-Lexus

Just get the complete kit instead of old stuff.

That's exactly what I'd do, new quality manifold, 4 weber or dellorto style throttle bodies, make up your own rectangle air filter housing assemby, fit a good quality air filter and drive the car!

 

[JustenGT8]

Something like this.

http://www.efihardware.com/products/1603/manifold-Toyota-4.0-Lexus

Just get the complete kit instead of old stuff.

That looks like it would be for the VVTi...just based on how steep the port angles look?

can anyone confirm?

 

[Cobber]

I just google this kind of stuff up it's better than lookong at porn all day.....?

 

[RedPhoenix]

Okay so you guys would recommend making a new lower intake manifold then becasue its so restrictive? I can basically get 3 more of the Maxima TB's for free, so I wouldnt be price effected.

Are you saying there wouldn't be any gains with I kept the stock LIM?

 

[JustenGT8]

Yup

keeping LIM = why bother

 

[Jake Breyck]

ya matt the lower manifold is the problem with our intakes. i can help you make a new lower manifold

 

[nz jailbar]

those TBs on custom lower intake ,headers and porting would be a good starting point to get some good power

 

[ihiryu]

This is going to sound horrible....

But OBX makes ITB's for our engines. The question is; who did they rip it off from?

 

[JustenGT8]

This is going to sound horrible....

But OBX makes ITB's for our engines. The question is; who did they rip it off from?

Do they actually have one though? Last attempt to find their setup resulted in nada....i think they just put it out there to gauge interest and if enough THEN they would have ripped off someone elses work

 

[RedPhoenix]

ya matt the lower manifold is the problem with our intakes. i can help you make a new lower manifold

Alright Jake, lets do it. We will talk soon.

 

[Spinall4]

I know that the ITB is the hotness for NA apps, has anyone done a ITB setup in a forced induction car? You could just have all of the itb's sticking straight up, then make a manifold that attaches to all of them. Is there no point beacuse the you don't need the extra flow on a FI motor?

 

[Zuffen]

Lots of work and no real gain except for trying to balance them.

 

[V8MX5]

Im currently fitting maxima throttles on my engine using the lower part of the manifold. Time in building this set up isnt a problem as im unemployed, so have about 9 hours each day to fill in time till the mrs comes home and already have 4 nissan throttles.
Question is, What exactly is wrong with the lower factory manifold ? Is is too restrictive ? Runners too long/short ?

Cheers

 

[gmacrae]

Im currently fitting maxima throttles on my engine using the lower part of the manifold. Time in building this set up isnt a problem as im unemployed, so have about 9 hours each day to fill in time till the mrs comes home and already have 4 nissan throttles.
Question is, What exactly is wrong with the lower factory manifold ? Is is too restrictive ? Runners too long/short ?

Cheers

From what i understand, the length is maybe hindering top end power a bit (though helping slightly down low), but the shape of the runners is the big issue. mismatched turns/kinks in the different runners and the fact they kinda flow sideways/horizontal at the head then the port kicks back downwards. The VVT intake is a work of art in comparison - i'd love to try and adapt one of those. I want to be able to compare runner/port spacing and shape.

From what i've seen on a number of projects, ITB's are a whole lotta effort for bugger all gain, and in many cases power is actually lost (definitely the case if you're using the stock lower manifold).

I liked GT8's short runner experiment (stock upper mani, short runner lower mani). If i cant adapt a VVT intake I'd like to give this a go.

That maxima twin throttle might be useful for a custom twin plenum design though if the throttles are big enough (say 50mm+ each)? You could seal the throttles from each other and have 1 per plenum/bank. Dunno if that would be worthwhile or if the engine is better to share its manifold plenum/vacuum between the banks?

 

[V8MX5]

I guess the main reason im doing a ITBs is for the sound and the looks. As long as the power stays the same I would happy. If power goes down then it may not be a good idea.
Would the power be less or more than the original standard 1UZ plenum/throttle combo ?
Take into account the engine will be ruinning an aftermarket ECU

 

[gmacrae]

I guess the main reason im doing a ITBs is for the sound and the looks. As long as the power stays the same I would happy. If power goes down then it may not be a good idea.
Would the power be less or more than the original standard 1UZ plenum/throttle combo ?
Take into account the engine will be ruinning an aftermarket ECU

If you're going to the trouble to make a custom intake with ITB's, you'd be much better off to start from scratch. New head flanges, with straight runners up to the ITB's.

Your aftermarket ECU will be running MAP sensor right? Take a small vacuum feed from each runner and run them all into a small chamber of some sort to take a clean MAP signal from.