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Old 04-05-2012, 12:25 AM   #21 (permalink)
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Now im assuming you mean that you got better mileage with the around 2,000rpm shifting point correct? I get mid to upper 30's on the freeway driving at a steady 60mph in cruise control. Im going to try and shift as low as possible from now on and see how that works. I've been shifting close to 2.5k when I drive so im going to lower that more and see what happens.

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Old 04-05-2012, 01:19 AM   #22 (permalink)
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I didn't actually see a noticeable difference one way or another but this could be where our motors differ. You're may be right for your car, but I'm not so sure. Most motors are most efficient a little below peak torque, but the torque "curve" on your motor looks more like a line, in part thanks to VTEC.

On my motor, peak torque occurs at something like 5200rpm, so friction aside, I'd be best off shifting in the upper 4000's. I think friction increases with the square of the speed though so at some point it outweighs my efficiency gains with rev'ing higher to get closer to peak torque.

Brake Specific Fuel Consumption (BSFC) Maps - EcoModder

^ Your BSFC is probably something between the Saturn DOHC's and the Toyota 1ZZ-FE. The Saturn is most efficient around 2500rpm and the Toyota, at 3000, so ideally you'll be accelerating with the pedal down around (or just before) the point where pushing it farther doesn't give significantly more power, and trying to keep the motor in that range.

EDIT: What instrumentation do you have?

Last edited by Ecky; 04-05-2012 at 01:34 AM..
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Old 04-05-2012, 03:17 AM   #23 (permalink)
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I dont have any intruments installed. I would consider scangauge but not OBDII and I don't want to go in and install MPGUINO. That is why im trying to find someone with a similar car as mine who has the above so that its more accurate but haven't had much luck yet.
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Old 04-05-2012, 08:29 AM   #24 (permalink)
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I found my MPGuino had a larger effect on my driving than any amount of reading, the instant feedback is really useful. I was getting frustrated at how I could practice what I thought to be good driving habits and it only improved my tank average by 1-2mpg, but I'm now able to regularly 8 to 15mpg better. I highly recommend you reconsider it.
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Old 04-11-2012, 02:21 PM   #25 (permalink)
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I wonder how your car would do with a civic motor in it . they swap in with minor modification
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Old 04-12-2012, 02:32 AM   #26 (permalink)
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Im not looking to swap it in with a weaker motor. I like the VTEC and the sportiness of everything else the car has, hoping that with the lower shift points I can get a change in MPG's. Need to find a bigger piece of plastic to cover the radiator but haven't had much luck in finding anything like it.
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Old 04-12-2012, 04:24 AM   #27 (permalink)
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You have a manual. Get the acceleration in the ballpark and just coast in neutral a lot. Hypermiling is all about the tail end, whether it be managing rear airflow or making the best of every drop of gas invested. Drive Without Brakes when possible.
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Old 04-12-2012, 10:22 AM   #28 (permalink)
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I was going to post what Sven said. You're reasonably close on the acceleration part. Now you need to work on the tail end. If your brakes failed, how would you handle the upcoming intersection? Start slowing down very early so you arrive at a low speed. We call it DWB - driving without brakes.

You can use a vacuum gauge for measuring load. You want to accelerate at 12-13 psi MAP. With a Scangauge I can watch both the Load gauge and MAP side by side and 12.5 is about 85% load.
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Old 04-13-2012, 03:54 AM   #29 (permalink)
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I know all the techniques, that isn't really the area I need help in. Need someone with the same car as me to gimmie some solid RPM numbers with seconds between shifts and things like that. Some of which has already been given but not concretely.
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Old 04-13-2012, 09:39 AM   #30 (permalink)
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My shifting target is based on where I land in the next gear. Whatever shift point puts you at about 1500 rpm after the shift is good. The spacing between gears varies so it depends on which gears you're shifting between.

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