Or you could bet me yours...

I'm looking for a 2006 Silverstone. See my WTB ad in the Cars for Sale forum.

-b

 

Round trip it is then. However I unfortunately can not do video as I do not have a camera. I guess you don't trust me enough? That's fine, I have nothing to gain from this anyway. I will do the test anyway this weekend and post the results and let them fall under all the useless testing everyone has already done.

By the way, for those of you who still don't believe that ap1's are extremely rich in lower rpm do some searching on the threads. Ap1s tend to run as rich as 10/1 and lean out towards 14/1 just before vtec, which makes a huge difference in power and amount of fuel used. Also just look back through this post, just about everyone who said they've experienced this has an ap1, and those who said the opposite have ap2s.

 

so there's no hope for us with ap2?

 

Video is just good practice. Whether or not I doubt you, there is always someone that will. Without a good record you just become another piece of anecdotal evidence.

There's little room for error in your test. The difference in 1 mpg is only going to be about .1 gal over 60 miles. I'm curious if just filling up at the pump is going to be accurate enough.

I'm not sure what your trying to prove really. If you really believe the fuel map is that big of a contributor then downshift to 5th. The RPM in 5th gear at 60mph is going to be almost exactly the same as it is in 6th at 70mph.

Whether the efficiency gain due to lean mixture offsets the drag increase is immaterial. The shift lever will fix it for you.

-b

 

i think that 55-65 is best. wasnt the speed limit set at 55 back in the days due to gas shortage, and it was tested that 55 mph was the optimal crusing speed for maximum MPG for most cars?

 

bvan, that is exactly what I am trying to prove. The reason why this whole claim came to be in the first place was from people who would cruise in 6th gear at different speeds. So while the title of this thread is slightly misleading since faster= better mpg is both true and false (for all cars since going 2mph will take as much fuel as 4mph), the primary idea is that going 65 vs 75 can make a difference in fuel consumption in early ap1s.

If anyone has the map for a/f ratio for an early ap1 that they could post up again (the one that was previously posted is no longer up) you will see how it is possible. With a very low torque, high output motor such as ours, dumping huge amounts of extra fuel doesn't only waste the excess fuel, but actually robs the engine of power. When the mixture gets closer to 14/1 not only is it not throwing away the extra fuel, but it is also making more hp&tq per unit of fuel.

i2ichal2d while that may be true (and I have heard that as well), you must take into consideration the fact that the cars of the time were less aerodynamic and the engine were more efficient at very low rpms and were geared to take advantage of that. Cars today are geared to run more efficiently at higher speeds now.

 

AssassinJN,

You're not really arguing with me then. Lets look at a couple of my earlier posts:
and
The original topic was comparing 60mph to 85-90mph. I think that's bullshit, as should anyone with an ounce of sense. Everyone whose been arguing with me seemingly hasn't read the thread. If they had, they probably wouldn't be arguing. I'm pretty much saying the sky is blue and grass is green.

-b

 

I am not trying to argue with you, and agree with those quotes. What I have been trying to say is that all though the speeds are exaggerated, it has been proven by numerous ap1 owners that when cruising in 6th gear on a highway, you CAN actually achieve a higher mpg by doing higher speeds. While 55 compared to 85 may fail this trial, a closer speed such as 65 and 80 has proven for more than just a handful of people to consistently give better gas mileage. As I have maintained the whole time, on most cars this kind of idea should be considered bs, however early ap1s run EXTREMELY rich, enough so that the different in power vs fuel injected into the engine has a greater effect on the car then drag.

Please keep in mind this is far from the first time that this topic has come up and my original reply was to inform everyone commenting on the physics of why it can't be true, that in fact it is true for a handful of us and the reason has to do with the fuel map overcoming aerodynamics. This was also true for my last car, a '97 Prelude SH, which I had run a similar test by cruising at 55mph 1-hour each way to and from work for a week, then cruising at 70 the next week. I had seen an average increase of 3mpg the second week with the lowest mph being equal to the highest when doing 55.

And dyhppy, sorry for not answering you sooner but no ap2's will not see any benefit of driving faster, and even later ap1s will not see much if any improvement as honda leaned out the fuel ratio sometime in late '02 or early '03 models.

 

...or get higher mpg still by just downshifting to keep the rpm in the most efficient range.

Perhaps that would be the better experiment. Same speed, different RPM's. More variables are held constant.

-b

 

Guys, guys, guys:

Sometimes I think s2k owners will argue about anything automotive!

All I know is this. When I bought my s2k back in '01, I wanted what was defined as a high performance car in those days, but was fearful of poor gas mileage the way I actually drive.

I don't care why, or who believes me, but I DO get around 30 mph at 100 or so. And my in-town mileage improves with shifts at 5K rpm or so, and by driving at a higher rpm in a lower gear. And I am delighted. Hell, I doubt that a Prius could get 30 mpg on the highway at 100 mph!

On a related topic brought up above, in 1974 the 55 mph speed limit was mandated to reduce fuel consumption. But they didn't have cars back then that got 30 mpg at 100! What I was driving back then got mileage in the simgle digits, no matter how I "granny" drove it. I bought a 4 cyl import, and was lucky to get 18 mpg, no matter how conservatively I drove. Thanks God we've got better cars now. And that I seem to have one of the best of them.