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Old 01-22-2012, 04:19 PM   #21 (permalink)
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I wonder if 90% load works out to about the same percentage of atmospheric pressure reading on a vacuum gauge. Highest regards to you Sentra for the dedication to precision in measuring the optimal P&G load levels. It convinces me that I am probably not accelerating quite aggressively enough.

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Old 01-22-2012, 04:30 PM   #22 (permalink)
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I also wonder at what point in load you hit WOT enrichment, since the MPG is increasing significantly as the load increases? Could you improve the MPG by pushing it to 95% load?

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Old 01-22-2012, 06:55 PM   #23 (permalink)
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IIRC, 98% and 99% engine load acceleration still stayed in closed loop. I did test a 95% load pulse later. It used slightly more fuel, but didn't shorten acceleration time or distance.
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Old 01-23-2012, 06:57 AM   #24 (permalink)
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Too many other distrations

Quote:
Originally Posted by SentraSE-R View Post
It doesn't matter for my tests, since I used the same stretch of road going the same direction, on the same day. And while we know the engine load will be higher, and pulse times will be longer on an incline (and load will be lower/pulse times shorter on a decline), there's no reason to expect the relative fuel consumption at each load to differ.

Yes, fastegg. I think it's ground breaking, too. I guess it's too technical, or too much work, or too expensive. I'm somewhat disappointed in the lack of interest/lack of comments returned on such breakthrough knowledge.
Yeah me too.. I mean literaly every day there's another device that makes my job easier... As i said, i built and road raced motorcycles for 25 years and all our tuning was guesstimates, 1,000's of plug chops, seat of your pants asking someone else or luck.... or hope !!!!
Now we have a choice of SG2, UG, DashDyno, OT-2, ScanXL Pro, Superchips (flash tuners), and another one i found today the 'inTune' touch screen tuning device. (check out this site, tunertools.com its got heaps of new tech) and about a dozen other sites.. and i find it just so bloody fascinating and happy that there are guys out there, all over the world sitting down working out how to make this stuff work, make it cheap, make it compatible with my car (and everyone elses), make it easy to use, make it realiable... and updatable... all that !!!!!! I reckon its f**ken unreal !!!
The only problem ive got now is deciding which one to get. I like the DashDyno, as it works out HP and torque, its got a GPS for gods sake to calculate the terain your driving on and accurate speedo, ports for O2 sensors and EGT... (go and have a look at its key features at the Autarra site
auterraweb.com/dashdyno.html ... Right now what i really want is super fine fuel consumtion figures... I need a tool that can tell me if i change tire pressures it can tell me, and by how much..... even only a few short years ago, a device that could do this was not even dreamt up yet, and yet here we are, the UG and SG2 might and how cheap are they ??? ... ... ... ... puts a big smile on my face...
I hope i'm not writing too much ?.... A few months back i bought an Autel MS509 code reader/scanner thingy... $70 'cause my girlfriends Peugeot 307 had a DTC light on... its been on for years, weve been charged $75 twice during servicing to turn the light off but it kept coming on so i bought a cheap scanner so I could turn the light off...and it said 'vehicle speed sensor' fault... there is a speed sensor on each wheel but it wouldnt tell me which one, the local Peugeot dealer wouldn't tell me how to check it.... they wouldn't help me one iota...
they just said "bring it in and we'll work on it" GRRRRRRRR (( so i'll leave the light on.. its not effecting anything.... Now, an unexpected find was on live view it tells me i can only get TP 85% max...(throttle position will only get to 85%...its fly-by-wire so, i wouldn't know what to look at... this would explain why its sooooo slow on hills.... I walked down to my friendly local Peugeot dealer and asked if they'd come accross this and all i recieved was the backs of their heads.... GRRRRRR (( Now to put that in perspective, ive rung my local Lexus dealer services dept and they couldn't be helpfull enough... They faxed me pages out of the workshop manual.... talked at length about servicing issues and i asked them if they'd have any idea if i could fit paddle shifters.. He said "leave it with me"... 2 days later he rang me back, he had asked some Lexus electrical guru and told me "no problem" blah-blah-blah... faxed me electrical pages out of the Lexus book with surgestions about the several ways to go about it.... "If you have anything you think we could help you with, call us" Its the black and white difference between 2 cultures....
I'd better stop writing.... i can't remember why i started !
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Old 01-23-2012, 08:06 AM   #25 (permalink)
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I'm somewhat disappointed in the lack of interest/lack of comments returned on such breakthrough knowledge.

I'd read it when you posted it, so forgive my not hitting the thanks button then. I was waiting to buy one of these gauges so as to have some references for the thread in order to comment. You're right about cheap and available, it is surprising to be around it all. I'm less than ten years removed from my last car with points ignition (and the first with a computer aboard).
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Old 01-23-2012, 08:30 AM   #26 (permalink)
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Great data. Thanks.
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Old 09-06-2012, 03:15 PM   #27 (permalink)
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I cannot imagine that there are many people that think that 90% WoT would give you the best fuel economy. I know that we have some lights that I can only make at ten miles over the speed limit, or at least I assume so, because I do not drive that fast!

Maybe I can do this instead.

Floor it! You will save money!
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Old 09-06-2012, 03:38 PM   #28 (permalink)
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Not necessarily 90% throttle but 90% load which may only be 50% throttle at the low rpm of best BSFC just below the first torque peak. Try for 1.5 inches of vacuum.
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It is still counter intuitive to everything we have been taught. But you have to know how to coast after each "rocket burn".
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Old 09-08-2012, 07:34 PM   #29 (permalink)
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I will just go back to accelerating slowly. Someday I will purchase a gauge. I doubt this forum has any active users that would tell me not to purchase one and I imagine that many of you would tell me that it would pay for itself quickly, but at least the short-term gain is to not buy one.
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Old 09-14-2012, 04:51 PM   #30 (permalink)
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Quote:
Originally Posted by SentraSE-R View Post
...

Yes, fastegg. I think it's ground breaking, too. I guess it's too technical, or too much work, or too expensive. I'm somewhat disappointed in the lack of interest/lack of comments returned on such breakthrough knowledge.
What is the motivation for your test:
  • Never found a BSFC map for your engine (I'm guessing, I can't find BSFC maps for my engines...)?
  • Wanted to check a BSFC map against real-world?

Also, for data logging, one could simply video the session and manually extract the data from the video to a spreadsheet, if you wanted to avoid buying as much equipment (er, depending on what equipment you already have). MPGuino could do the same job in that regard. I have a smartphone armband I can use to video my dash (in addition to its real purpose, video of traffic on bike rides, just in case).

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