Fuel economy?
For our normal applications, aluminum drive shafts would reduce the load needed to make each revolution. Less load, means engine doesnt work as hard to make the car go. Sorry, brain dead at the moment.
Carbon Fiber drive shafts... another story. Hear bad things about them. But the 350Z and G35 uses carbon fiber shafts and they work fine. Depends on who you get your CF shafts from.
Carbon Fiber drive shafts... another story. Hear bad things about them. But the 350Z and G35 uses carbon fiber shafts and they work fine. Depends on who you get your CF shafts from.
poor driving habits such as excessive acceleration and braking will reduce your mpg. as will stop and go city driving.
Last edited by jramosthe1st!; Jun 12, 2007 at 06:00 PM.
Never heard of the O2 sensor bypass mind explaining? I've worked on Nissan KA24de OBD2's for a while and never heard of a bypass, that actually works. Don't know how your passing without throwing code either or running rich since the second sensor diagnosis the byproducts that are converted after the CAT.
The design of OBD2 was to make every part of the engine fail safe so that if something was to fail it could be fixed immediately without damaging the environment. The second O2 sensor was really designed for when the CAT was to fail, or in your case for people like you that extrude and hollow out the CAT. There is no way around it that is how it was designed and there is no such thing as the O2 sensor bypass.
BTW I know what your about to say next. This is the biggest scam on ebay right now..
http://cgi.ebay.com/ebaymotors/Oxyge...QQcmdZViewItem
What you can use is an actual simulator and they vary on sensor and car type and run anywhere from $30.00 to $100.00. There not cheap.
http://webstore.o2simulator.com/inde...&ProdID=5&HS=1
Just to make a note: the simulators are for off road use and the simulation may affect and vary from car to car making some engines run richer than others. There is no guarantee and they don't function as well as the actual sensor since they don't pick up the actual signal that is produced from the sensor.
Since the topic is about fuel economy here it is in a nutshell!!!!
Gutting out your CAT converter will also decrease gas mileage. The EGR BPT system was designed to pull gasses from the exhaust system into the intake manifold system to decrease NOX, and inlet air, in return this shrinks injector pulse width which overall conserves fuel. This effect can only happen with back pressure that happens through the catylitic conversion process. With out the back pressure of the CAT there is little to few gasses bypassing through the intake system so infact you decrease your fuel economy either way.
I always recommend high flow cats.They are safe for the environment as well as free up HP, and conserving fuel economy.
If your turbo charged thats an entirely different format where the restriction of the CAT decreases power output, but for natural aspiration it is an incentive to use when you want fuel economy and power.
Last edited by BigVinnie; Jun 12, 2007 at 12:24 PM.
Now what I am about to say isn't to attack you in any viscous way, I am just here to bring about truth and factual information.
Never heard of the O2 sensor bypass mind explaining? I've worked on Nissan KA24de OBD2's for a while and never heard of a bypass, that actually works. Don't know how your passing without throwing code either or running rich since the second sensor diagnosis the byproducts that are converted after the CAT.
The design of OBD2 was to make every part of the engine fail safe so that if something was to fail it could be fixed immediately without damaging the environment. The second O2 sensor was really designed for when the CAT was to fail, or in your case for people like you that extrude and hollow out the CAT. There is no way around it that is how it was designed and there is no such thing as the O2 sensor bypass.
BTW I know what your about to say next. This is the biggest scam on ebay right now..
http://cgi.ebay.com/ebaymotors/Oxyge...QQcmdZViewItem
What you can use is an actual simulator and they vary on sensor and car type and run anywhere from $30.00 to $100.00. There not cheap.
http://webstore.o2simulator.com/inde...&ProdID=5&HS=1
Just to make a note: the simulators are for off road use and the simulation may affect and vary from car to car making some engines run richer than others. There is no guarantee and they don't function as well as the actual sensor since they don't pick up the actual signal that is produced from the sensor.
Since the topic is about fuel economy here it is in a nutshell!!!!
Gutting out your CAT converter will also decrease gas mileage. The EGR BPT system was designed to pull gasses from the exhaust system into the intake manifold system to decrease NOX, and inlet air, in return this shrinks injector pulse width which overall conserves fuel. This effect can only happen with back pressure that happens through the catylitic conversion process. With out the back pressure of the CAT there is little to few gasses bypassing through the intake system so infact you decrease your fuel economy either way.
I always recommend high flow cats.They are safe for the environment as well as free up HP, and conserving fuel economy.
If your turbo charged thats an entirely different format where the restriction of the CAT decreases power output, but for natural aspiration it is an incentive to use when you want fuel economy and power.
Never heard of the O2 sensor bypass mind explaining? I've worked on Nissan KA24de OBD2's for a while and never heard of a bypass, that actually works. Don't know how your passing without throwing code either or running rich since the second sensor diagnosis the byproducts that are converted after the CAT.
The design of OBD2 was to make every part of the engine fail safe so that if something was to fail it could be fixed immediately without damaging the environment. The second O2 sensor was really designed for when the CAT was to fail, or in your case for people like you that extrude and hollow out the CAT. There is no way around it that is how it was designed and there is no such thing as the O2 sensor bypass.
BTW I know what your about to say next. This is the biggest scam on ebay right now..
http://cgi.ebay.com/ebaymotors/Oxyge...QQcmdZViewItem
What you can use is an actual simulator and they vary on sensor and car type and run anywhere from $30.00 to $100.00. There not cheap.
http://webstore.o2simulator.com/inde...&ProdID=5&HS=1
Just to make a note: the simulators are for off road use and the simulation may affect and vary from car to car making some engines run richer than others. There is no guarantee and they don't function as well as the actual sensor since they don't pick up the actual signal that is produced from the sensor.
Since the topic is about fuel economy here it is in a nutshell!!!!
Gutting out your CAT converter will also decrease gas mileage. The EGR BPT system was designed to pull gasses from the exhaust system into the intake manifold system to decrease NOX, and inlet air, in return this shrinks injector pulse width which overall conserves fuel. This effect can only happen with back pressure that happens through the catylitic conversion process. With out the back pressure of the CAT there is little to few gasses bypassing through the intake system so infact you decrease your fuel economy either way.
I always recommend high flow cats.They are safe for the environment as well as free up HP, and conserving fuel economy.
If your turbo charged thats an entirely different format where the restriction of the CAT decreases power output, but for natural aspiration it is an incentive to use when you want fuel economy and power.
Time for me to go outside and kick the rock around the yard again........
There is a book by HAYNES on engine management/OBD2 systems it is very interesting and many people should read it. It will give you answers as to why O2 sensor bypass is mumbo jumbo.
Heres what the book looks like you can get it for under $20.00.
Last edited by BigVinnie; Jun 12, 2007 at 05:40 PM.
Registered User
Joined: Jul 2006
Posts: 7
well i do understand what your saying and i didnt feel like you were attacking me in anyway. im probobly am running rich, although i am happy with the 23-24 i now get .since i was getting 17-20 for a while, im sure the other part of my problem is the fact im running 4.4:1 vlsd, and 205/50/16 instead of the 205/55/16 stock,
how ever i should have said tricked the ecu not bypass the o2 sensor, and the way i do that is something i learned from my qr25de days, its the double sparkplug non fouler, drill out one 1/2" for the o2 sensor to fit directly into and just leave the other alone, put both into the bung and your set, it just pulls the o2 out of enough that the ecu thinks there is a cat there and wont throw the code $2-5 bucks worth of parts no ebay bs
how ever i should have said tricked the ecu not bypass the o2 sensor, and the way i do that is something i learned from my qr25de days, its the double sparkplug non fouler, drill out one 1/2" for the o2 sensor to fit directly into and just leave the other alone, put both into the bung and your set, it just pulls the o2 out of enough that the ecu thinks there is a cat there and wont throw the code $2-5 bucks worth of parts no ebay bs
how ever i should have said tricked the ecu not bypass the o2 sensor, and the way i do that is something i learned from my qr25de days, its the double sparkplug non fouler, drill out one 1/2" for the o2 sensor to fit directly into and just leave the other alone, put both into the bung and your set, it just pulls the o2 out of enough that the ecu thinks there is a cat there and wont throw the code $2-5 bucks worth of parts no ebay bs
Anyways to the point, I can't preach that kind of information. All I can do is be direct with the information that is practical, and reliable. Every time some one installs an OBD1 HOTshot, OBX, or DC sports header on there OBD2 engine I have to explain in depth that they need an OBD1 cat and to transplant a bung 2" after the CAT for the second O2 sensor.This has become a routine for me. I try to keep information as practical as possible so it is easy for people to work around and it has structure to build off of.
averaging 20.8 mpg with the heavy 350Z rims. Time to really save up more for lighter rims. But as of this month, Im dead broke due to smog and reg fees and all my other stupid bills...
Thread
Thread Starter
Forum
Replies
Last Post
Black97240sx
For Sale - Wanting To Buy (WTB) Or Trade (WTT)
6
Feb 20, 2002 09:10 PM
