300ZX (Z32) Performance / Technical Discussions related to Turbo charging, Supercharging, Engine, ECU, exhaust, and etc. performance enhancements and Techical related.

Boost Control Question.

Old 08-15-2005, 02:04 PM
  #1  
Bred To Kill Them All
Thread Starter
 
Join Date: Aug 2005
Posts: 42
Boost Control Question.

Would using a boost controller at two settings... improve fuel economy @ the lower boost setting? If so... what woudl the lowest recommended boost be for a 90 TT? and then just up the boost when you want to race...

Theoretically and Applicationally speaking of course... any experiences in this field would be nice too... so tell me your stories.
ArmyZ is offline  
Old 08-16-2005, 11:22 AM
  #2  
Bred To Kill Them All
Thread Starter
 
Join Date: Aug 2005
Posts: 42
Anyone? ...
ArmyZ is offline  
Old 08-16-2005, 12:04 PM
  #3  
Jack Of All Trades
 
CanyonCarver's Avatar
 
Join Date: Jun 2004
Location: Acton, California
Posts: 2,296
Since increasing boost in your engine increases the thermal efficeincy, you should get better gas mileage out of it when running increased boost as long as you keep your foot out of it and drive around like a little ol lady.

Meaning, if you drive a certain way at low/no boost to try and get good gas mileage, and then crank up the boost and drive the same way, you'll get better gas mileage.

I know what I mean, do you?
CanyonCarver is offline  
Old 08-16-2005, 06:09 PM
  #4  
Bred To Kill Them All
Thread Starter
 
Join Date: Aug 2005
Posts: 42
Can you elaborate on that a little? or point me towards and article taht does?
ArmyZ is offline  
Old 08-16-2005, 07:50 PM
  #5  
Jack Of All Trades
 
CanyonCarver's Avatar
 
Join Date: Jun 2004
Location: Acton, California
Posts: 2,296
Originally Posted by ArmyZ
Can you elaborate on that a little? or point me towards and article taht does?
Do a google search on thermal, volumetric, and mechanical efficiency. I don't have hard core written proof, but I would consider the following to be fact:

Take an internal combustion engine that operates at 100% efficiency. Add 14.7 parts of air and one part of fuel, compress it and ignite it. That one explosion will propel you a little ways down the road.

Now take an equivalent engine that operates at 120% efficiency (this comes from higher boost). Perform the same process as above with the same amount of fuel and air. You will then travel approximately 20% farther down the road.


Last edited by CanyonCarver; 08-16-2005 at 07:53 PM.
CanyonCarver is offline  
Old 08-16-2005, 09:00 PM
  #6  
Administrative Brown Guy
 
Riz Z Speed's Avatar
 
Join Date: Jun 2003
Location: Ontario, Canada
Posts: 5,406
Originally Posted by CanyonCarver
Take an internal combustion engine that operates at 100% efficiency.
Yes, Please.

I think everyone in the world would be interested in a 100% or a 120% internal combustion engine. Not only would it not waste any gasoline, at 120% it would actually produce it!!
Riz Z Speed is offline  
Old 08-17-2005, 05:57 AM
  #7  
Jack Of All Trades
 
CanyonCarver's Avatar
 
Join Date: Jun 2004
Location: Acton, California
Posts: 2,296
Originally Posted by Riz Z Speed
Yes, Please.

I think everyone in the world would be interested in a 100% or a 120% internal combustion engine. Not only would it not waste any gasoline, at 120% it would actually produce it!!
LOL............. Do a google search on thermal, volumetric, and mechanical efficiency.

Turbocharging / Supercharging gets you over 100%

http://www.auto-ware.com/combust_bytes/eng_sci.htm
http://www.epi-eng.com/ET-VolEff.htm
http://www.epi-eng.com/ET-ThermlEff.htm
http://en.wikipedia.org/wiki/Volumetric_efficiency


EDIT: I got it....... , I'm talking thermal and volumetric.

Last edited by CanyonCarver; 08-17-2005 at 06:04 AM.
CanyonCarver is offline  
Old 08-17-2005, 12:53 PM
  #8  
Bred To Kill Them All
Thread Starter
 
Join Date: Aug 2005
Posts: 42
LoL Riz... tha'ts exactly what i was thinking. All those days in physics and engineering classes... and here i was thinking my education just went out the window. I could have sworn we learned about the fact that an engine(or anything mechanical) will never operate at 100% efficiency... because of the quotient of friction.

Now only if i can get my TT engine to not produce friction.
ArmyZ is offline  
Old 08-17-2005, 09:56 PM
  #9  
The Cake Is A Lie!
 
entropy31's Avatar
 
Join Date: May 2003
Location: WA
Posts: 5,690
i think CC was just using 100% as a nice easy base 10 reference number, not claiming that an engine could actually reach 100% efficiency, but thamn that would be nice.
entropy31 is offline  
Old 08-18-2005, 06:01 AM
  #10  
Jack Of All Trades
 
CanyonCarver's Avatar
 
Join Date: Jun 2004
Location: Acton, California
Posts: 2,296
My THAMN anologies, always getting me in trouble !!!!!!!

To answer ArmyZ's question, he'll get better gas mileage by increasing his boost, not decreasing it. Increasing boost increase volumetric and thermal efficeincy which gives you more bang for the one-part of fuel injected. Oh yeah, I should qualify that with the ASSumption that you're maintaining a 14.7:1 AFR.
CanyonCarver is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bearcat
300ZX (Z32) Performance / Technical
2
05-02-2013 01:23 PM
datsun280zxt
280ZX (S130) Forums
7
01-17-2011 09:49 PM
BlackCrow
350Z Forced Induction
0
07-21-2006 10:08 PM
BlackCrow
350Z Forced Induction
4
07-10-2006 11:33 AM
Lynxbat
Wanted (WTB / WTT)
0
02-06-2004 08:42 AM


Thread Tools
Search this Thread
Quick Reply: Boost Control Question.


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.