Will a Turbo System Make Give my Z better Gas Mileage?
With my TN kit driving normal with occasional blasts I went from about 25mpgto avergaing 19mph or so. When I do nothing but rag my car-especially now with my new set-up 10mpg is what Im getting. I burned slightly more than 1/4 tank of gas in 30 minutes of flogging it
Originally Posted by USN HM 350Z
man you will get like 40+ mpg with twin turbo's
have a good day
have a good day
This is the gheyest thread today, would all the fanbois please STFU...JVAN get in here man..
Originally Posted by Minda
Guys, am I right in assuming that Supercharger would be much thirstier than Turbo?
geez im gonna shoot myself in the head, whats up with e-tard questions, you trying to make me kill myself huh...fanboi
Originally Posted by Chris Macellaro
Hello!
You are speaking about a very small amount of degradation of Volumetric Efficiency with the pressure ratio drop across the engine due to a possible restriction that the turbo off boost may or may not cause. In my experience I have found only on very restrictive and inefficient set-ups have a very negligible drop in VE due to the turbo inlet posing a restriction. With most of the current systems out for these cars this is not a problem and I would not worry about this issue my friend.
This is the reason for closed loop to trim pulse width. Although using a large injector such as the 750 cc/min you have stated on a completely stock ECU would be far out of the realm of closed loop correction. Most piggy-back and Standalone ECU's on the market allow for trimming and scaling injectors and pulse width. Again with a proper system/injector selection/tuning you can have similar fuel mileage as the factory realized. As long as other major modifications that effect VE have not been made. The average bolt on turbo kit if tuned properly will not affect economy as said above.
Cruise Horse Power is again negligibly changed. In my experience most vehicles need very little power to actually run down the road once up to speed. Steady state most modern vehicles fall into the 15 -50 hp range needed to maintain speed steady state.
All due respect to Mr. Bell and no disrespect meant. Mr. Bell's book has some good theories and practical equations. In my line of work and business I am afforded the opportunity to test tuning theories and mathematical equations on actual working examples of these situation/engines. I have been fortunate to be able to apply what I have heard and learned from others and have been able to find what works.
Have a great day sir.
Chris Macellaro
You are speaking about a very small amount of degradation of Volumetric Efficiency with the pressure ratio drop across the engine due to a possible restriction that the turbo off boost may or may not cause. In my experience I have found only on very restrictive and inefficient set-ups have a very negligible drop in VE due to the turbo inlet posing a restriction. With most of the current systems out for these cars this is not a problem and I would not worry about this issue my friend.
This is the reason for closed loop to trim pulse width. Although using a large injector such as the 750 cc/min you have stated on a completely stock ECU would be far out of the realm of closed loop correction. Most piggy-back and Standalone ECU's on the market allow for trimming and scaling injectors and pulse width. Again with a proper system/injector selection/tuning you can have similar fuel mileage as the factory realized. As long as other major modifications that effect VE have not been made. The average bolt on turbo kit if tuned properly will not affect economy as said above.
Cruise Horse Power is again negligibly changed. In my experience most vehicles need very little power to actually run down the road once up to speed. Steady state most modern vehicles fall into the 15 -50 hp range needed to maintain speed steady state.
All due respect to Mr. Bell and no disrespect meant. Mr. Bell's book has some good theories and practical equations. In my line of work and business I am afforded the opportunity to test tuning theories and mathematical equations on actual working examples of these situation/engines. I have been fortunate to be able to apply what I have heard and learned from others and have been able to find what works.
Have a great day sir.
Chris Macellaro
As far as closed loop and pulse width, the fact is a larger injector cannot physically match the efficiency of a smaller one for lower duty cycles. The larger the injector, the less efficient it becomes with smaller and smaller amounts of fuel being metered. Whatever you do, alter fuel pressure and such, the same can be done to a smaller injector for a more precise metering of fuel. The reverse is also true for larger batches of fuel. Hence the need to upgrade injectors to avoid putting the stock ones outside their duty cycle. The larger injector will be more efficient than a smaller one at the limit of its ability. Of course, when you are cruising around off boost, its the smaller side of the cycle we are concerned with and hence the efficiency edge goes to the smaller injector. But I'm sure you already know this as you said, with proper matching and tuning, it can be similiar. Similiar is right, but not the same.
Now, maybe we are talking different points here. Maybe there is enough slop in the stock tuning to allow someone such as yourself to tune a larger injector equipped engine to match the stock metering of fuel, and perform enough mind blowing headwork and timing adjustment to still maintain the stock VE off boost at the same given rpm needed to maintain that speed. But I doubt it. That whole turbo thing in the way sure does play a ***** on resonance and scavenging effect.
Will
Yeah right, if you have a turbo in there you know you're going to be driving like a bat out of hell, so it'll kill your gas mileage. But if you have a Z with FI then who cares about gas mileage?
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From: gaithersburg
Gas
Originally Posted by dTor
If you're serious, then there is something very wrong with your car. I don't get less than 16 mpg in all city driving, using my gas pedal like an on/off switch...
...and that's with my mods!
...and that's with my mods!
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