I'm not as interested in the get-HP-quick do-dads, but I'm curious about the front bar. Manik? Or have you found something else that will fit on the 'X?chris.soto said:
I'm not as interested in the get-HP-quick do-dads, but I'm curious about the front bar. Manik? Or have you found something else that will fit on the 'X?chris.soto said:Note:
My photos will include the elusive Front Bar and Tail Light Guards.
chris.soto said:Note:
I
Gas mileage increase of 4+MPG
See the above links for testimonials. I expect at least 2 MPG from the filter and oil.
Too funny Worm! I about laughed Diet Pepsi right out my nose! Thanks for making my night.TheWorm said:Ard speaks the truth. Validation was posted on the Lexus board. Here's the link: http://www.angelfire.com/ny5/ricerroni/roni.html
This is not technically correct. The oxygen sensor measures oxygen levels in the EXHAUST gases, and the ECU will take this reading and makes adjustments to the A/F ratio to achieve the proper exhaust gas oxygen reading. The A/F ratio is a variable that's changed dynamically by the ECU - it's not set at a pre-programmed point - it's constantly changing due to a variety of factors. An airfilter can, in fact, have a significant effect on gas mileage. To imagine this, reverse your example (instead of no airfilter, imagine a highly restrictive or clogged airfilter). Not only would performance suffer, but mileage too.mogur said:No offense intended, but you are living in a dream world if you actually believe all this. Just to focus on one point for example, on a modern engine an air filter will have absolutely no effect on gas mileage. None, zippo, zilch. This is because the computer constantly reads the A/F ratio via the oxygen sensor and adjusts it accordingly to keep it at the preprogrammed point. You could run with no air filter and this would not change the A/F ratio and thus would also not change the fuel mileage. A K&N might or might not buy you a very small horsepower gain but it will do nothing for mileage. Synthetic oil (I run it in all my cars - Mobile 1) will buy you a very small mileage and horsepower increase but it is nowhere as dramatic as the numbers you suggest.
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golfski said:
This is not technically correct. The oxygen sensor measures oxygen levels in the EXHAUST gases, and the ECU will take this reading and makes adjustments to the A/F ratio to achieve the proper exhaust gas oxygen reading. The A/F ratio is a variable that's changed dynamically by the ECU - it's not set at a pre-programmed point - it's constantly changing due to a variety of factors. An airfilter can, in fact, have a significant effect on gas mileage. To imagine this, reverse your example (instead of no airfilter, imagine a highly restrictive or clogged airfilter). Not only would performance suffer, but mileage too.
I posted my doubts about significant MDX HP gains, from a K&N filter alone, in another thread. However, there are applications where a K&N filter alone WILL help to make noticeable power gains - I just don't think the MDX is one of them....
rkrans said:This is my take on K&N. A K&N filter - assuming it offers less air resistance than stock - will improve power or gas mileage the same way a pair of headers would . . . BUT not at WOT.
Imagine sucking a milkshake through a small and large straw. The large straw offers less resistance and is easier for you to suck the same fluid through - your body's diaphram does not need to exert as much force as through the smaller straw.
rkrans
I think the confusion arises because of the terminology. The A/F is, after all, a ratio. Therefore, even if this ratio is kept constant, the variation on the A and the F (in absolute terms) has a direct gas mileage effect. The principal of a freer intake system (eg - a K&N filter), is to allow the A of the A/F ratio to be higher for a given throttle position, with the following expected result: More A which means more F, which generally means more power (for a given throttle position). That's the principal, at least. For the MDX, I'm of the opinion that the intake is fairly well tuned out of the box, therefore, a simple mod like replacing the air filter will have minimal effects.mogur said:The oxygen sensor measures the a/f ratio by varying a voltage tightly around the ideal a/f rato of 14.7 to 1. (This is called the styrichometric ratio.) The computer reads this voltage to maintain the A/f ratio at 14.7 to 1. The only exception is at WOT when it is allowed to go open-circuit and exceed the richness dictated by the sensor. No matter what you do in the intake circuit the oxygen sensor and ECU will maintain the same ratio. Thus, it has no effect on gas mileage as there is a direct and unalterable ratio between A/F ratio on the intake side and the oxygen level on the exhaust side.
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Tom