TB Bypass Mod Question

shawnberry45 · 11-21-2020, 09:38 AM

What kind of caps is everyone using to cover the ports on the throttle body?
Does it need a clamp? Or just push them on and done?

Spooler · 11-21-2020, 12:37 PM

You need them up north in the cold otherwise your TB butterflies will freeze and hang. Not sure if you get any benefit from disconnecting them.

JARblue · 11-21-2020, 03:00 PM

The benefit from disconnecting them in hot weather climates is the throttle bodies aren't heated up by the coolant (thereby heating up the intake air) when the car is hot.

No need to cap them unless you're worried about some small bugs/critters taking up nest in the tubes. If you drive the car enough you won't have that problem.

shawnberry45 · 11-21-2020, 05:36 PM

Quote:

Originally Posted by JARblue

The benefit from disconnecting them in hot weather climates is the throttle bodies aren't heated up by the coolant (thereby heating up the intake air) when the car is hot.

No need to cap them unless you're worried about some small bugs/critters taking up nest in the tubes. If you drive the car enough you won't have that problem.

Perfect - it’s a garage car, never sees cold or snow
With my A2A Stillen setup these hoses really get in the way! TopGunz V1 is a very tight fit with the charge pipe and I think the TB bypass would help free up alittle space.

DrBacon · 11-21-2020, 06:03 PM

Quote:

Originally Posted by shawnberry45

What kind of caps is everyone using to cover the ports on the throttle body?
Does it need a clamp? Or just push them on and done?

Personally, I didn't cap the ports on the throttle bodies, just left them open. As for the coolant line output/input it's self instead of capping it and risking that blowing out from pressure some how I just looped the hose. I've driven the car in high 30s/low 40s with no issues, don't really plan on driving at freezing temperatures so can't speak for that.

ZoomZ · 05-24-2026, 12:23 PM

Does any one know the hose Inner diameter at the throttle bodies?

I'm thinking of just bending to a u-shape, some SS piping and creating some beads on the ends and clamping to the Inlet and outlet of those hoses.

Thus just circulating the coolant and having ability to revert back to oem if need be. Car is only summer driven.

I want get the proper SS pipe O/D.

Kzonts · Today, 11:39 AM

Quote:

Originally Posted by ZoomZ

Does any one know the hose Inner diameter at the throttle bodies?

I want get the proper SS pipe O/D.

This is what I found

The Nissan 370Z throttle body coolant lines require a 5/16-inch (approximately (8 mm) Inner Diameter (ID) hose.

This might work

http://https://www.amazon.com/TAISHER-Stainless-Fittings-Splicer-Fitting/dp/B0DKHT1KNJ

11-21-2020, 09:38 AM	#1 (permalink)
shawnberry45 Base Member Join Date: Jul 2012 Location: Chicago, IL Posts: 67 Drives: G37 Rep Power: 14	TB Bypass Mod Question What kind of caps is everyone using to cover the ports on the throttle body? Does it need a clamp? Or just push them on and done?

11-21-2020, 12:37 PM	#2 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 14,153 Drives: 2013 Nismo 370z Rep Power: 2684394	You need them up north in the cold otherwise your TB butterflies will freeze and hang. Not sure if you get any benefit from disconnecting them. Optimiser likes this.

11-21-2020, 03:00 PM	#3 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 45 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684442	The benefit from disconnecting them in hot weather climates is the throttle bodies aren't heated up by the coolant (thereby heating up the intake air) when the car is hot. No need to cap them unless you're worried about some small bugs/critters taking up nest in the tubes. If you drive the car enough you won't have that problem. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

05-24-2026, 12:23 PM	#6 (permalink)
ZoomZ Track Member Join Date: Jan 2017 Location: Vancouver, BC Posts: 808 Drives: 17' 370Z Nismo Rep Power: 40657	Does any one know the hose Inner diameter at the throttle bodies? I'm thinking of just bending to a u-shape, some SS piping and creating some beads on the ends and clamping to the Inlet and outlet of those hoses. Thus just circulating the coolant and having ability to revert back to oem if need be. Car is only summer driven. I want get the proper SS pipe O/D. __________________ “Action without vision is a nightmare.”

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