5th Generation Maxima (2000-2003) Learn more about the 5th Generation Maxima, including the VQ30DE-K and VQ35DE engines.

throttle body coolant bypass

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Old Dec 20, 2006 | 03:52 PM
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absoundlab
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throttle body coolant bypass

I searched around on board tracker and was unable to find a write up for the 5th gen on doing this mod.

There is a line going in one side of the TB and then there is another line coming out of the TB. Do I just remove both of them from the TB and connect them together? If so what do I do about the the open pipes on the TB now? Do I just cap them off?
Old Dec 20, 2006 | 08:28 PM
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absoundlab
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anyone?.....
Old Dec 20, 2006 | 09:20 PM
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You don't have to cap off the TB. Why are you deleting the TB heat? You CAN have TB icing in Georgia........ and the amount of heat added to the intake air by the coolant flowing through the TB doesn't amount to a hill of beans.
Old Dec 20, 2006 | 10:38 PM
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absoundlab
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im no longer in ga
Old Dec 20, 2006 | 10:45 PM
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splice the two hoses together, don;t worry about capping the pipes off
Old Dec 20, 2006 | 11:20 PM
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Didnt know anyone in the maxima community did this. I know its common to do on a bunch of other engines though.
Old Dec 21, 2006 | 07:47 AM
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absoundlab
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by any change does anyone have a write up on this?
Old Dec 21, 2006 | 03:08 PM
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i know people who did this to my old engine... ka24de it is absolutely pointless. you are better off spending the money on 3 gallons of coolant and a thermostat and doing that instead. it changes the temperature only a few degrees.
Old Dec 21, 2006 | 05:43 PM
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I have had this done for months and months, down to single digit (*F) temps and it's still fine.
Old Dec 21, 2006 | 08:01 PM
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TB icing is unlikely at single digit temps because there usually is not enough moisture in the air. It usually occurs between about 34 to maybe 40 deg. F. and some humidity.
Old Dec 22, 2006 | 07:14 AM
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This past week we had a massive winter storm, blizzard like conditions, temps in the mid 20's with 100% humidity.
Old Dec 23, 2006 | 03:34 PM
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Originally Posted by NmexMAX
I have had this done for months and months, down to single digit (*F) temps and it's still fine.

Same here.
Old Dec 24, 2006 | 03:37 AM
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absoundlab
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so being is fla and south ga should I do it or not?

is it going to harm anything?

am I going to gain anything?
Old Dec 24, 2006 | 03:17 PM
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We just told you, so if you can read then....
Old Dec 24, 2006 | 04:29 PM
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absoundlab
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none of my questions were answered so far
Old Dec 24, 2006 | 05:05 PM
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http://cgi.ebay.ca/93-06-Nissan-Alti...QQcmdZViewItem

looking at the picture shuls answer all questions....
Old Dec 24, 2006 | 05:08 PM
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I connected them together with a straight through 'adapter'. Left the lines 'open'.

If it wont freeze in temps in the 20's w/ 100% humidity after sitting for over 8 hours, you wont have a problem in S FL.
Old Dec 24, 2006 | 05:27 PM
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absoundlab
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alright thank you for the info also what do you think the gains are>?
Old Dec 24, 2006 | 05:39 PM
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None if any.
Old Dec 24, 2006 | 06:51 PM
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absoundlab
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so then why should i do it?
Old Dec 29, 2006 | 04:30 AM
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http://forums.maxima.org/showthread.php?t=225507
Start at post #7 or so.
Old Dec 29, 2006 | 07:01 AM
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Originally Posted by absoundlab
so then why should i do it?
Because you keep asking about it. See what it does for you.
Old Jan 15, 2007 | 11:52 PM
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Sorry to dig up this thread guys, what exactly do you cap off the coolant lines with?

is it 1/4" inner and 1/2" outter diameter?

I want to know this before I hit up the auto parts store. Thanks!
Old Jan 16, 2007 | 07:10 AM
  #24  
absoundlab
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I used a 1/2 inch connector
Old Jan 16, 2007 | 07:55 AM
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Thanks for the info so far, but does anyone have a picture of the 2 lines that need to be "spliced" together? Where did you guys find the adapter to connect the lines together?
Old Jan 16, 2007 | 08:01 AM
  #26  
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Originally Posted by 03BlkSETE
Same here.

I just did my throttle body bypass about 3 weeks ago.....

but I didnt do any splicing or use any connectors, though...I just ran a 5/16 hose from one end to the other, clamped them off, and capped off the TB

Fairly easy mod, although the clamps are a pain in the *** to get to, if you are impatient, like me...


Good mod for very little money, IMO!


Old Jan 17, 2007 | 08:42 PM
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absoundlab
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Old Jan 18, 2007 | 06:32 PM
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thanks boys. I got it to work.

I took out the whole MF'in module (EGR + Coolant) that attaches to the block.
Old Jan 19, 2007 | 09:43 AM
  #29  
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Originally Posted by absoundlab
I searched around on board tracker and was unable to find a write up for the 5th gen on doing this mod.

There is a line going in one side of the TB and then there is another line coming out of the TB. Do I just remove both of them from the TB and connect them together? If so what do I do about the the open pipes on the TB now? Do I just cap them off?
Why do it, waist of time and money. No performance gains. And even is you did gain 1-2 hp you qouldn't even notice it. A tail wind would give you more noticed performance.
Old Jan 19, 2007 | 03:16 PM
  #30  
absoundlab
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how is it a waste of money? If you are that cheap so be it but to do this mod it will cost you $2.13 so if you cant afford it let me know and I will send you the money. And it took me all of 5 mins to do.
Old Jan 19, 2007 | 03:48 PM
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I think i read in the 4th gen stickies something about where doing this has negative effects on the TB as far as it sticking or something... I plan on doing this on nights when i go out to the track and nights when i go out for fun
Old Jan 19, 2007 | 03:49 PM
  #32  
absoundlab
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It something you just do and leave it. It will get to be too much of a pain in the a$$ to do it and then undo it all the time.
Old Feb 4, 2007 | 12:52 PM
  #33  
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Just wondering.. what is the point of this mod? If it doesn't cool the air significantly enough to notice, and there isn't really any other reason to do it, why risk even the slightest possibility of TB freezing?
Old Feb 4, 2007 | 03:35 PM
  #34  
absoundlab
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if you live in the south where it is hot its like why not do it
Old Feb 4, 2007 | 05:46 PM
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Originally Posted by absoundlab
if you live in the south where it is hot its like why not do it
Got it. Sounds fair. I just don't think ill do it since i live in minnesota. There are always a few weeks like this one where it actually doesnt really get above zero... at all. i know it usually happens around 32 but just dont wanna risk it. cool mod though
Old Feb 4, 2007 | 05:53 PM
  #36  
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FYI All 5.0 gen owners. Don't disconnect the EGR/TB coolant module. Your car cannot go over 3000 rpm without it...

Don't ask how i know.
Old Feb 4, 2007 | 06:07 PM
  #37  
absoundlab
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Originally Posted by MaxBoost925
FYI All 5.0 gen owners. Don't disconnect the EGR/TB coolant module. Your car cannot go over 3000 rpm without it...

Don't ask how i know.

this information isnt true. i've done the mod on my car and it is fine. please do no post false information. this may have happened to your car but this doesnt mean it will happen to EVERY 5th gen
Old Feb 4, 2007 | 06:24 PM
  #38  
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Originally Posted by absoundlab
this information isnt true. i've done the mod on my car and it is fine. please do no post false information. this may have happened to your car but this doesnt mean it will happen to EVERY 5th gen

um. who has more experience on this forum cousin?

i disconnected mine as well as my secondary o2 sensors.

the EGR module was the culprit for not going above 3000rpm.
Old Feb 4, 2007 | 07:44 PM
  #39  
absoundlab
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Originally Posted by MaxBoost925
um. who has more experience on this forum cousin?

i disconnected mine as well as my secondary o2 sensors.

the EGR module was the culprit for not going above 3000rpm.

umm I would say I do.

im sorry you don't know what you are doing.
Old Feb 5, 2007 | 09:43 AM
  #40  
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Originally Posted by IloveVQ
Just wondering.. what is the point of this mod? If it doesn't cool the air significantly enough to notice, and there isn't really any other reason to do it, why risk even the slightest possibility of TB freezing?
Didn't you see? +8 HP!!! according to some guy on ebay, since it is on ebay it must be true! Yet another example of how Nissan is screwing us on the HP numbers! Hahaha. (Read with extreme sarcasm).
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