Upgraded throttle body

[fake ben taylor]

The plenum opening being 70mm isnt a problem really as it doesnt have a butterfly in it acting as a restriction and turbulating the air.

 

Tricky youre correct except at WOT where you dont want resteictions and as little vacuum as possible as youre not metering tje air to control rpm

 

Should have a sample plate soon, assuming it fits then the kit will be ready but Ive been thinking that it might be better to also develop a larger diameter intake pipe and MAF housing as to see the best gains requires it all as a package. This unfortunately would have to have a remap when fitted to recalibrate the maf.

[Snjur]

Also wanted to ask same question like Tricky. This TB would have much more snese on after market plenum which has a larger diammeter than stock. Like this again you have a backpresure coming 75mm to 70mm

 

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[fake ben taylor]

I can get the calcs done if you like but a 70mm open hole flows a lot more than a the throttle body will with the throttle plate and shaft through the middle

 

Edit: also the adapter plate is tapered to ensure a smooth transition and thisbwill srrve to accelerate the air slightly increasing velocity and lwading to a better fill of the plenum in the same way tapered trumpets and throttle bodies do.

 

Edited January 26, 2016 by fake ben taylor

[davey_83]

so seems like a good buy then as per the independent YouTube butt dyno review................

[RobPhoboS]

There are a few threads on this kind of stuff on the my350z site for ex:

 

http://my350z.com/forum/na-builds/601891-upper-plenum-project-75mm-maxima-tb.html

 

http://my350z.com/forum/na-builds/578133-87mm-tb-project.html

 

 

Will keep an eye on this

[Pritchard]

I see no mention of the dyno testing done in the US with the upper plenum removed during a dyno run, and the clear gains had when a bloke took it off. they found 25bhp!

Next for research, have a look at dyno results of the same car when they added a 90mm TB with a custom inlet manifold by Carbotron.

 

and as per Mark's graph, look at that vacuum!

there is power to be made in the inlet track. you just need to decide where you want to start looking for it.

[BobbyZ]

Does the HR also suffer from the same restrictions in the plenum?

[Luke350]

Don't think so Bobby. Can somebody confirm?

 

 

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[Tricky-Ricky]

The very fact that the HR sports two throttle body's would indicate to me that Nissan have at least designed the plenum to flow enough to actually Need the two throttles.

[fake ben taylor]

What he said ^^^^

 

The hr has two throttle bodies to reduce exactly this restriction the de suffers from

[Jay M1988]

Any update on this Ben?

[fake ben taylor]

Whoops missed this. Not yet, cad drawing was all wrong and been crazy busy at work to take it elsewhere

[djtimo]

Im still interested in this ben, Bigger TB will surely help on a boosted motor.

[fake ben taylor]

Oh for sure as we've discussed on whatsapp, theres no reason really for anyone to not go for bigger tb. I'll try get my spare plenum and the rb to a machinist

[Stan350Z]

So it’s been a couple of years since the last post on this thrread I was wondering if this had gone anywhere? I’m very interested with a larger TB to combine with 06+ air box/filter*/plenum spacer*/mrev2/hfc*/cat-back*/remap* (*already installed). I’m looking at importing the NWP but a domestic option would be very interesting.

 

Does anyone know whether Ben managed to finalise a design?

[StevoD]

26 minutes ago, Stan350Z said:

So it’s been a couple of years since the last post on this thrread I was wondering if this had gone anywhere? I’m very interested with a larger TB to combine with 06+ air box/filter*/plenum spacer*/mrev2/hfc*/cat-back*/remap* (*already installed). I’m looking at importing the NWP but a domestic option would be very interesting.

 

Does anyone know whether Ben managed to finalise a design?

After having my nwp and having it mapped it wasn' worth it 

 

It should be the last thing you do after long tube headers and everything else tbh

[Stan350Z]

That’s great info thanks, I’ll move the TB to a later stage of the plan in that case. Reckon given my current bolt ons it’s worth doing another remap after mrev2, velocity stack? The last remap with existing bolt ons got 312bhp at the fly.

[Jetpilot]

I have had experiences of larger throttle bodies in a couple of cars and neither particularly good, great for a few more hp, but in both experiences part throttle they were horrible, great if you are on a drag strip though. Unless you want to spend an absolute fortune on dyno time getting the mapping just right, i really wouldnt bother, all depends what you use the car for i guess.

[Ekona]

You would go quicker by having a good poo before every drive than you would by changing the throttle body. 

[Jake.Lowther]

Isn't the standard throttle body 3" so surely without increasing the intake pipe you're still restricting it to 3"?

[davey_83]

Yes but no. The throttle butterfly itself causes a restriction even at wide open throttle, so a larger throttle body can help offset the restriction. Allowing for more air to pass either side of the butterfly, aside from the slightly larger TB itself.