Nissan 370Z Forum  

A Couple of rare mods would like your opinions with.

Originally Posted by AngelSoulll For the crank vent system, my only concern is the possibility of the water meth mix going to the crankcase from the small tube going from

Go Back   Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain


Like Tree6Likes

 
 
LinkBack Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 12-28-2015, 12:27 AM   #12 (permalink)
A True Z Fanatic
 
Jordo!'s Avatar
 
Join Date: May 2010
Location: nirvana
Posts: 6,394
Drives: 2023 NATM
Rep Power: 419
Jordo! has a reputation beyond reputeJordo! has a reputation beyond reputeJordo! has a reputation beyond reputeJordo! has a reputation beyond reputeJordo! has a reputation beyond reputeJordo! has a reputation beyond reputeJordo! has a reputation beyond reputeJordo! has a reputation beyond reputeJordo! has a reputation beyond reputeJordo! has a reputation beyond reputeJordo! has a reputation beyond repute
Default

Quote:
Originally Posted by AngelSoulll View Post
For the crank vent system, my only concern is the possibility of the water meth mix going to the crankcase from the small tube going from the intake piping to the valve cover. As you may know that when the car is idling or throttle is partially pressed, that little tube acts as a fresh air feed to the crankcase to make up for the vacuum made by the intake manifold. When in WOT, the same port acts as a vent due to the low vacuum in the manifold cannot vent out the pressure inside the crankcase. So the flow of the fresh air going to the throttle body helps pulling the vented gasses coming from the valve cover though that tube.

Please correct me if I'm wrong. Just need to make sure if I'm on the right track here.
It won't spray at idle and you shouldn't need it at part throttle. Check valves on each WI injector will prevent it being pulled under vacuum.

Think of them as an extra set of fuel injectors -- except it would be a mix of water and alcohol. Also, you will want injectors that atomize the mix as much as possible -- even fuel can cause wetting and pool inside the IM if the atomization is poor (and especially when running cold).

But, this is my whole point: If you need WI at 0 boost (i.e., atmospheric pressure) and part throttle/low load, but NOT under high load, WOT or near-WOT, you should play with the existing tune first and not invest the money, time and effort in adding an entire secondary fueling/cooling system...

Moreover, high humidity will actually quench det -- it's water, highly atomized, and it displaces air... high pressure, high oxygen, high heat (which also increases pressure) are the potential problems -- but if you are knocking at part throttle and not at WOT, its a weird tuning foible that can be addressed with your existing tuning software.

I'm telling you, the problem is either the tune (and if so, likely a problem on throttle tip-in, due either to too much spark advance, less than ideal valve timing or overlap, or a lean condition, causing a miss) or you aren't knocking.

Datalog, see what is happening, under what conditions and where and use that as your guide.
AngelSoulll likes this.
__________________
Enjoy it. Destroy it.

Last edited by Jordo!; 12-28-2015 at 12:30 AM.
Jordo! is offline   Reply With Quote
 

Bookmarks


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
A couple Porsche GT3's, a couple BMW M's and a Nismo 350z walk into a bar... 6/8/13 HKYStormFront Photography 9 06-13-2013 08:13 PM
Opinions On Future Mods?? MrZ Nissan 370Z General Discussions 24 01-11-2012 08:54 AM
Opinions welcome on mods... RandyD Nissan 370Z Roadster (Convertible) 13 08-05-2011 10:22 AM


All times are GMT -5. The time now is 06:05 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2