P&G question for suzuki clone drivers.
Over the weekend I installed my injector kill switch. Now I'm ready to try some serious P&G. What is a good technique for these cars? I want to stay around 40 mph most of the time. This is how I did it on the rural part of my commute this morning; I start a ICE off glide at 45 mph and bump start around 35 mph then pulse up to 45 again using 1/2 throttle in 5th gear. If there are hills I try to time the glide with a down slope in elevation and usually pulse up the next hill. Is this optimal for the average speed I want to maintain? Any tips would be welcome. How are you doing your P&G Peakster, it seems to be working well for you?
|
I'd like to hear Peakster's feedback too - particularly whether he's using the same gears & speeds that he originally tried.
I think I recommended he go to one lower gear for the speed he was pulsing to get the RPM up a little bit (closer to where I think the car's best BSFC area is, and to reduce the pulse length). It's been so long since I drove the "stock" gearing, I can't remember whether a 5th gear 35-45 pulse is ideal. |
Most of my 'P&G' is on city streets where the speed limits are usually 50km/h (~30mph), so it's kind of between true non-stop P&G and CODFISH since I still have to accelerate from a complete stop at traffic lights.
I usually pulse in 4th gear at speeds from 25-45mph as the car acclerates better and requires less time of the ICE being on. With my car's gearing and engine, I'd say that 5th gear is too high of a gear for my liking when pulsing from 30-40 mph: the engine feels too laboured. 5th is more suited for 40-55 mph pulsing because the rpms are higher at those speeds. For example: when pulsing firmly in 5th gear, my SG reads around 28-30mpg, while in 4th gear it's ~22 mpg (while I believe 3rd gear is too low at ~16 mpg). Even though there's 6-8 mpg less while pulsing in 4th compared to 5th, I find that the duration with the ICE on is cut in half if I use 4th instead of 5th. Try doing the P&G in 4th instead of 5th and see how it turns out. 2300-3000 rpms seems to be the sweet spot during the burn, with my car at least. My last tank was still with P&G, but I was excessively hitting 5000-6000 rpms during the first half of the tank in 2nd gear and it still turned out higher than 60 mpg. Yet more evidence that P&G works. Yes MetroMPG: I'm a convert! :o |
Thanks guys.
Quote:
|
If you want, you can calculate your RPM at any speed/gear using the calculator on this page:
https://wildcatent.freeyellow.com/zookmods/calc.htm ... and the gearing/F.D. info for your car found about half way down this page: https://metrompg.com/posts/tranny-swap.htm --- Peakster pretty much confirmed what I was expecting, which is you'd probably be better off using 4th between 35/45 mph with an aggressive pulse- at least 1/2 throttle. I usually go by ear - I try to at least push to the point where I start to hear induction noise/growl. Not scientific, but works well for me. Hearing induction sounds tells me I'm opening up the butterfly enough to be reducing vacuum for the burn. |
Quote:
Quote:
|
looks like @ 35 mph 4th gear turns the ICE @ 2031 rpm and 45 mph = 2611 rpms. In 5th 35 mph= 1682 rpms and 2162 @ 45. So 4th looks much better.
|
Definitely. I'm so lazy, I didn't plug the figures in to figure that out for myself. Glad you reported back.
...waits for jwxr7's next fill up report.... |
Tried 4th gear pulses going home yesterday. It seemed to work well at keeping the pulses shorter. It was much easier with the kill switch too:thumbup: .
I have some more questions :) . There are times when I am ready to pulse back up to speed, but I know that conditions won't be good for a glide right away (Like with an approaching long hill). What should I do? Should I pulse up to speed quickly in 4th then just cruise at speed in 5th until I can glide again, accelerate to speed slowly in 5th, or other? Also, should I glide at all if it will be a shorter glide? thanks, with your help I may hit 70mpg soon :cool: . |
I avoid hard pulses when I cannot anticipate a decent glide (2-3 times farther than pulse). If you are speaking of level ground approaching a hill I would suggest you do whatever you have done before for now.
Till you get used to it, I would only suggest P&G if you know you can get a +compensating glide. Keep up the good work. |
All times are GMT -8. The time now is 10:34 PM. |
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.