Nissan 370Z Forum  

Nissan 370Z: Eliminating hot coolant heater hoses on both throttle bodies

Disclaimer: The DYI (Do it yourself ) below is only to share what I have been doing for the 370Z and Infiniti G37 cars. If you are lacked of automotive

Go Back   Nissan 370Z Forum > Tech Area > DIY Section (Do-It-Yourself)

Like Tree2Likes

Reply
 
LinkBack Thread Tools Display Modes
Old 06-06-2012, 01:51 AM   #1 (permalink)
Base Member
 
Join Date: May 2012
Location: San Jose, Ca.
Posts: 22
Drives: 2010 Nissan 370Z 6MT
Rep Power: 7
VQ37VHR-K28 will become famous soon enough
Default Nissan 370Z: Eliminating hot coolant heater hoses on both throttle bodies

Disclaimer:

The DYI (Do it yourself ) below is only to share what I have been doing for the 370Z and Infiniti G37 cars. If you are lacked of automotive knowledge or experience, please DO NOT perform this task yourself.
I shall assume NO responsibilities, whatsoever, for any consequential damage to you and/or your vehicle in this case.
The 370Z in general, depending on what you do to it, is NOT a simple vehicle to work on. If one thing goes wrong, many more can follow since the car has very tight tolerance and very low margin for error. So, take care and be very careful.

This is a DYI for eliminating the throttles heater hoses for the VQ37VHR motor for your 370Z and Infiniti G37. I recommend removing these hoses ONLY for the folks that are living in the geographical region where the ambient temperature does not come below 30F (-2C). Otherwise, leave them on in order to prevent
possible throttles icing during freezing temperatures.
For the enthusiasts that live in the tropical regions, this heated throttle motors and chambers design not only clogs the engine compartment with hoses, but will DEFINITELY reduce engine performance dues to hot air temperature, especially for supercharged and turbocharged folks. By eliminating these hoses,
the system will NOT activate a CEL because this heat elimination occurs after the air temp sensors, and nothing is being monitor after that. Cooler air will DEFINITELY helps engine performance and prevents knocking.

So here are the basic steps:

First : Disconnect your battery before starting anything. One mistake could cost you the IPDM controller, which can be throat cutting expensive

Please refer to the factory cooling hoses diagram below and study this picture very carefully. I will be referring the 4 throttle coolant hoses by their respective numbers.

LEFT SIDE = DRIVER
RIGHT SIDE = PASSENGER


Pictures below show the original factory set up for the left and right throttles. Here you have burning hot coolant running through both the throttles and heating up the intake air considerably. The hood temp of the VQ37VHR is very high to begin
with due to the wonderful VVEL design and unfortunately, a very flimsy thin cooling radiator.

For the LEFT throttle, the hoses are #15 and #16. For the RIGHT throttle, the hoses are #6 and #7.



For both the LEFT and RIGHT side throttles:

Remove hoses #15 and #16, #6 and #7 from the both throttles' end.



For the LEFT side throttle:

1) COMPLETELY remove hose #15 out of the car. Discard this hose.
2) Connect hose #16 to the metal coolant pipe shown below.
3)) Plug both the throttle nipple openings with high quality rubber plugs.
4) BE SURE that hose #16 does not rub against anything. If it does, you have to put rubber sleeve on the hose.
5) Done for this side.


For the RIGHT side throttle:

1) COMPLETELY remove hose #7 out of the car. Discard this hose.
2) Now you only have hose #6 as shown below.



3) Cut this hose #6 around the place shown below, just between the 2 sleeves



4) After the cut, this is how hose #6 looks like



5) Custom fabricate a preformed hose, around 4 inch long as shown below. Also, custom make a sleeve around 2 inch long to go over the hose . Use a barb fitting and install on one side of the hose as shown:



6) Connect the other side of the barb fitting of this hose to the cut end of hose #6 shown above



7) Connect the the loose end of the custom hose ( Marked X ) to the metal pipe ( Marked X ) as shown in the photo below.



8) Finally, the hose #6 should look like this. BE SURE to adjust the sleeve to where the hose rubs against the harness below.
9) Put high quality rubber plugs on the throttle nipple openings.



9) You are TOTALLY done.

10) Start up the car and check for leak.
11) Drive the car, hard and fast..... and check for leak again.
12) Periodically inspect to be sure that there is absolutely no leak !!!
13) Have fun with cooler air intake....

You engine compartment will be less clogged from now on. It will be easier to get to your spark plugs and coils. Most importantly, you shall have colder intake air for sure.




VQ37VHR-K28 is offline   Reply With Quote
Old 06-09-2012, 12:39 PM   #2 (permalink)
Base Member
 
Join Date: Sep 2011
Location: FL
Posts: 11
Drives: Blue 370z
Rep Power: 7
JDMz is on a distinguished road
Default

Which ones are the supply hoses to the return hoses. The reason why I ask is because I'm thinking of doing this mod with a 2 way solenoid valve so you can bypass or have normal config. thanks
JDMz is offline   Reply With Quote
Old 06-09-2012, 01:22 PM   #3 (permalink)
Enthusiast Member
 
Join Date: Apr 2010
Location: Las Vegas Nevada
Posts: 299
Drives: 09 370Z yellow,auto
Rep Power: 9
2004YZFR1 is on a distinguished road
Default

Nice detailed write up! I did the same type of job to my old CBR 600F3 race bike. It helps.
__________________
K & N Filters | HPS silicone air intakes| Fast Intentions CBE with 18" resonators |
2004YZFR1 is offline   Reply With Quote
Old 06-09-2012, 02:16 PM   #4 (permalink)
Base Member
 
Join Date: Apr 2012
Location: Mathews, AL
Posts: 68
Drives: 2012 370Z Base SP M6
Rep Power: 7
vjarnot is on a distinguished road
Default

Quote:
Originally Posted by JDMz View Post
Which ones are the supply hoses to the return hoses. The reason why I ask is because I'm thinking of doing this mod with a 2 way solenoid valve so you can bypass or have normal config. thanks
I'm no expert, but the hoses that remain must be the supply hoses, don't you think? Looks like he's just short-circuiting the supply to the return.
vjarnot is offline   Reply With Quote
Old 06-10-2012, 01:58 AM   #5 (permalink)
Base Member
 
Join Date: May 2012
Location: San Jose, Ca.
Posts: 22
Drives: 2010 Nissan 370Z 6MT
Rep Power: 7
VQ37VHR-K28 will become famous soon enough
Default

Quote:
Originally Posted by vjarnot View Post
I'm no expert, but the hoses that remain must be the supply hoses, don't you think? Looks like he's just short-circuiting the supply to the return.
It makes no difference which is the return or the supply hose in this case because : All I did was disconnecting the throttle connections completely and route the input hose to the output hose ( or other way around ). So this is in no way a disruption to the coolant flowing paths. Let me know if you ahve any more questions.
VQ37VHR-K28 is offline   Reply With Quote
Old 06-10-2012, 02:29 AM   #6 (permalink)
Base Member
 
Join Date: May 2012
Location: San Jose, Ca.
Posts: 22
Drives: 2010 Nissan 370Z 6MT
Rep Power: 7
VQ37VHR-K28 will become famous soon enough
Default

Thank you very much
VQ37VHR-K28 is offline   Reply With Quote
Old 06-10-2012, 02:30 AM   #7 (permalink)
Base Member
 
Join Date: May 2012
Location: San Jose, Ca.
Posts: 22
Drives: 2010 Nissan 370Z 6MT
Rep Power: 7
VQ37VHR-K28 will become famous soon enough
Default

Quote:
Originally Posted by 2004YZFR1 View Post
Nice detailed write up! I did the same type of job to my old CBR 600F3 race bike. It helps.
Thank you very much
VQ37VHR-K28 is offline   Reply With Quote
Old 07-30-2014, 07:14 AM   #8 (permalink)
A True Z Fanatic
 
carlitos_370z's Avatar
 
Join Date: Jul 2013
Location: Puerto Rico
Posts: 7,146
Drives: 13 Nissan 370Z SP M6
Rep Power: 4224
carlitos_370z has a reputation beyond reputecarlitos_370z has a reputation beyond reputecarlitos_370z has a reputation beyond reputecarlitos_370z has a reputation beyond reputecarlitos_370z has a reputation beyond reputecarlitos_370z has a reputation beyond reputecarlitos_370z has a reputation beyond reputecarlitos_370z has a reputation beyond reputecarlitos_370z has a reputation beyond reputecarlitos_370z has a reputation beyond reputecarlitos_370z has a reputation beyond repute
Default

the thread is old but im thinking on do it!!!
Juanpo likes this.
carlitos_370z is offline   Reply With Quote
Old 07-30-2014, 08:11 AM   #9 (permalink)
Rated Z
 
JARblue's Avatar
 
Join Date: Mar 2011
Location: Austin, TX
Age: 37
Posts: 27,004
Drives: 2011 370Z Sport MT
Rep Power: 631292
JARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond repute
Default

I took the opportunity very recently when I removed my throttle bodies for cleaning. I made it a lot simpler though and did not reconnect the hard line at the back of the engine. I took hose #6 and disconnected it from the passenger side TB, rotated it around, and connected it to where he reconnects hose #16 on the driver side. The FSM identifies this as E: Heater Pipe, where hose #5 was originally connected (cut off in the diagram). No extra parts required, except 2 extra plugs for the hard line behind the engine.
__________________

2011 370Z 6MT Sport Gun Metallic | R2C | FI | Z1 | RJM | TWM | EcuTek | ZSpeed | EVO-R | GT Mat | Custom Z Fog Light | Custom Z Start Button
JARblue is offline   Reply With Quote
Old 11-17-2014, 09:25 AM   #10 (permalink)
Base Member
 
Join Date: Sep 2014
Location: CA
Posts: 45
Drives: G37 Sedan
Rep Power: 4
conquistador is on a distinguished road
Default

Doesn't the TB get heat soaked anyway? After 15-20 minutes of driving EVERYTHING is heat soaked...
conquistador is offline   Reply With Quote
Old 08-07-2015, 12:55 AM   #11 (permalink)
Premium Member Bitches
 
DEpointfive0's Avatar
 
Join Date: Jan 2012
Location: SoCal
Posts: 14,826
Drives: a lot
Rep Power: 17145
DEpointfive0 has a reputation beyond reputeDEpointfive0 has a reputation beyond reputeDEpointfive0 has a reputation beyond reputeDEpointfive0 has a reputation beyond reputeDEpointfive0 has a reputation beyond reputeDEpointfive0 has a reputation beyond reputeDEpointfive0 has a reputation beyond reputeDEpointfive0 has a reputation beyond reputeDEpointfive0 has a reputation beyond reputeDEpointfive0 has a reputation beyond reputeDEpointfive0 has a reputation beyond repute
Default

This write up is better than the others
JARblue likes this.
__________________
Do YOU want to know what/where I got my username from?
( Click to show/hide )
DEpointfive0 is offline   Reply With Quote
Old 08-07-2015, 01:34 AM   #12 (permalink)
Rated Z
 
JARblue's Avatar
 
Join Date: Mar 2011
Location: Austin, TX
Age: 37
Posts: 27,004
Drives: 2011 370Z Sport MT
Rep Power: 631292
JARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond repute
Default



This is the one that should be stickied. My only comment is I prefer forum hosted pics (either attached to post or linked from an album) for DIYs because links to 3rd party hosting are not guaranteed to still be active years down the road
__________________

2011 370Z 6MT Sport Gun Metallic | R2C | FI | Z1 | RJM | TWM | EcuTek | ZSpeed | EVO-R | GT Mat | Custom Z Fog Light | Custom Z Start Button
JARblue is offline   Reply With Quote
Old 08-07-2015, 02:01 AM   #13 (permalink)
Rated Z
 
JARblue's Avatar
 
Join Date: Mar 2011
Location: Austin, TX
Age: 37
Posts: 27,004
Drives: 2011 370Z Sport MT
Rep Power: 631292
JARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond repute
Default

Also an update on my Z. I noticed the rotated hose I used was rubbing a little bit. So I used some hi-temp felt gasket I had lying around as a protective barrier for the hose.
__________________

2011 370Z 6MT Sport Gun Metallic | R2C | FI | Z1 | RJM | TWM | EcuTek | ZSpeed | EVO-R | GT Mat | Custom Z Fog Light | Custom Z Start Button
JARblue is offline   Reply With Quote
Old 08-07-2015, 01:09 PM   #14 (permalink)
Enthusiast Member
 
Smashley's Avatar
 
Join Date: Aug 2013
Location: Maryland
Posts: 331
Drives: mt/sport/tour MB
Rep Power: 5
Smashley is on a distinguished road
Default

Anyone monitoring their intake temps close enough to notice a difference after doing this?
Smashley is offline   Reply With Quote
Old 09-03-2015, 12:09 PM   #15 (permalink)
Super Premium Member
 
RN SHARK's Avatar
 
Join Date: Jun 2011
Location: Wake Forest, NC
Age: 38
Posts: 535
Drives: 09 370Z, 14 SRT GC
Rep Power: 29
RN SHARK has a reputation beyond reputeRN SHARK has a reputation beyond reputeRN SHARK has a reputation beyond reputeRN SHARK has a reputation beyond reputeRN SHARK has a reputation beyond reputeRN SHARK has a reputation beyond reputeRN SHARK has a reputation beyond reputeRN SHARK has a reputation beyond reputeRN SHARK has a reputation beyond reputeRN SHARK has a reputation beyond reputeRN SHARK has a reputation beyond repute
Default

So I'm sitting here, doing this modification and was wondering if I'm introducing a bunch of air into the coolant system. Do I have to bleed the system after this??
__________________
___________
'09 T/S/Nav/6sp/Z1/RacingBrake/Carbotech/Nismo/SPL/Swift/SRP/Ichiba/Whiteline/F.I. LTH&CBE/UpRev/Stillen BCK/Ings+1/Motul/Wavetrac/RE-11
'14 Grand Cherokee SRT , '08 TL Type-S
RN SHARK is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Larger Throttle bodies...? TypeOne Intake/Exhaust 24 11-16-2015 12:42 PM
Ams inc. 370z/g37 silicon coolant hoses Wolf@AMS AMS Motorsports 0 03-06-2012 04:31 PM
High flow throttle bodies pokeyl Intake/Exhaust 11 12-16-2011 04:33 PM
Impul Throttle Bodies 370Ztune Engine & Drivetrain 6 05-25-2009 03:33 AM
Intake manifold / throttle bodies wstar Engine & Drivetrain 14 04-15-2009 10:55 AM


All times are GMT -5. The time now is 02:32 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2