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.

 

Anyone? ...

 

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?

 

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.

 

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.

 

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.

 

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.

 

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.