Acceleration mini-experiment

[SVOboy]

http://crxmpg.com/accelmpg.html

Here's mine, *shrug*

[diamondlarry]

I think there is something to the medium-heavy acceleration being better. If you take a look at my gaslog you'll notice a pretty steep increase a few tanks back. It corresponds to my change in acceleration technique. I used to accelerate in each gear to 1500 rpm's at a throttle setting of ~15 according to the SG. At the point where my FE took a leap up was when I switched to accelerating to 2000-2500 rpm's at a load of ~70-75% according to the SG. The TPS reads significantly higher with this technique. I should also note that I usually kill the engine and coast as far as possible once I reach my top/target speed.

[kps]

Originally Posted by SVOboy

http://crxmpg.com/accelmpg.html

Here's mine, *shrug*

Yes, this test, via the Throttle Position During Acceleration and its effect on FE thread, is what made me want to try this myself. In my case, though, I wanted to try it without involving any hypermiling techniques.

Originally Posted by Bill in Houston

Mmm-hmm. I think that this is the key. Accelerating as quickly as you can w/o making the ECU put you in open-loop or in a richened state.

I suspect you are right; the car does go open loop under full throttle, but acceleration (by 'feel', anyway) does not change very much between heavy and full throttle. Given that, and that I expected from others' tests that rapid acceleration to be more efficient, I decided to use WOT to (presumably) put rapid acceleration in a worse light, i.e. to see whether it's more efficient even if the driver is not careful with the throttle.

I think the next test I'd like to do is between WOT and rapid closed-loop acceleration, provided I can manage the latter reasonably reliably, e.g. with a mechanical stop under the accelerator.