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 22 gram Dr Pulley Sliders - performance figures

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gavinfdavies
Maxi-Scooter Rider
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Number of posts : 104
Location : Newport, South Wales, UK
Points : 315
Registration date : 2017-10-20

PostSubject: 22 gram Dr Pulley Sliders - performance figures   Thu Apr 12, 2018 2:37 pm

Having had the sliders in for a while now, I thought I'd summarised my findings and collate all my measurements into one thread. It took me a while to located my original posts hidden amongst other threads.

Ok, results of the speed trials are in, this time based on two-way averages conducted due up-wind and due down-wind, since it was a very windy day today. To give you an idea how windy, the 0-90mph time was 13.95 seconds downwind, but 21.2 seconds up wind! Shocked Note: the original times were only one-way, but I would add that it was a calm evening and there was little if any wind. Another point to note is that my original 0-50/60/70/80 speed rolls were done from a 'drag' start where I bought the rpms up to about 3,000 before releasing the brakes. The 22g slider run was done in a hurry due to traffic approaching, and I didn't have time to faff trying to bring the revs up etc.

Test type:----- Stock 28g rollers: -------- 22g Dr Pulleys:

40-80mph----------------8.60s--------------------8.77s

00-50mph----------------5.15s--------------------4.93s
....-60mph--------------6.93s--------------------6.78s
....-70mph--------------9.44s--------------------9.03s
....-80mph--------------12.22s-------------------12.13s
....-90mph--------------15.79s-------------------17.57s

Speed & rpm figures for cruising:

Speed:----------Stock----------22g Dr Pulleys
40mph------------------------------3,800
50mph------------------------------4,300
60mph------------------------------4,700
70mph------------------------------5,200
80mph------------------------------5,800
90mph------------------------------6,500

DOES ANY ONE HAVE A FULL SET OF STOCK VALUES?
If you pass them on, I'd like to edit them into the chart, thanks.


Summary:
With hindsight I should have liked to have done some more testing for lower speed acceleration (0-30 and 0-40 for example) as here the bike really does seem to jump forwards. At lower speeds the 22g slider do give a slight improvements (approximately 5m lead at 50-60mph speeds) over the stock rollers, even with the original figures having been taking from a 'drag' start. At higher speeds the acceleration times are actually slightly worse. This is particularly noticeable with the important 40-80mph roll on which is a good simulation of a typical overtaking manoeuvre. This may be partly due to the climatic conditions today playing with the figures despite me doing a two-way average.

I suspect though it's more to do with the way that the rollers are designed to function. Maximum initial acceleration but with reduced cruising rpms. That changeover seems to happen around 70mph, which for me is ideal. they do seem a fair bit more eager at sub-60mph speeds, and the reduction in cruise rpms should be good at higher speeds. I'm surprised how 'practical' the transformation is considering these are such light 22g sliders compared to stock 28g rollers. Going to 22g rollers would have been much more compromising in the real world I feel. Overall, I'm very pleased.
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bikehiker
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PostSubject: Re: 22 gram Dr Pulley Sliders - performance figures   Thu Apr 12, 2018 3:01 pm

Good info. Those 22g sliders seem to give the better of both situations: Initial acceleration and tall gear high speeds for economy and reduced engine wear at highway cruising.
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gavinfdavies
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PostSubject: Re: 22 gram Dr Pulley Sliders - performance figures   Thu Apr 12, 2018 4:32 pm

yeah, but I've got a dip in revs as you accelerate hard through 5,000rpm and about 50mph. The revs drop a little and you loose urgency for a few moments. Stands out when the bike normally accelerates like a cat with a rocket up its arse.
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Flyingpanman
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PostSubject: Re: 22 gram Dr Pulley Sliders - performance figures   Thu Apr 12, 2018 4:50 pm

I have a set of 25g sliders as recommended by the Dr Pulley web site. There is some improvement in acceleration and cruising rpm's and I'm happy with my purchase.

Asking for a set of stock values is of no real use as there are still factors that will affect things. For example, the rider's weight, the windscreen in use, and even such things as a top box and altitude from sea level.

Are your speeds from the Honda speedometer? They will be over-reading probably.

All in all, only a "before and after" of the one machine and rider is a reasonable indication of any gains.
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Mech 1 twa
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PostSubject: Re: 22 gram Dr Pulley Sliders - performance figures   Thu Apr 12, 2018 7:36 pm

Very good info.

I ride with a GPS and speedo is very accurate 1 mph faster than GPS speed. I'd say speedo is almost true speed.

26 G sliders working for me. Rocket ---NO but fast enough to be fun.
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Easyrider
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PostSubject: Re: 22 gram Dr Pulley Sliders - performance figures   Fri Apr 13, 2018 2:30 am

gavinfdavies wrote:
yeah, but I've got a dip in revs as you accelerate hard through 5,000rpm and about 50mph. The revs drop a little and you loose urgency for a few moments. Stands out when the bike normally accelerates like a cat with a rocket up its arse.

Gavin,
Is your Swing running lean on acceleration like mine did with K&N air filter?
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gavinfdavies
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PostSubject: Re: 22 gram Dr Pulley Sliders - performance figures   Fri Apr 13, 2018 11:38 am

I don't think so. The bike still did this between the 22g sliders and fitting the new exhaust. It feels more like the transmission is shift into high gear!

For example, with wide open throttle she accelerates at about 5,500-6000 rpm, but then around 50mph the revs drop to about 4,500 before rising again but now linearly with speed and this continues to full speed. During the rev drop the bike does still keep accelerating, but no as well due to the drop out of the power band as it were.

You can see the big dip in power on my dyno chart I had made before I fitted the exhaust.

I wonder if it's to do with the shape of the sliders? They're marketed as having two different ratios due to the funny shape - one for high acceleration, one for low-rev cruising. I wonder if this is the transition? I might buy a set of cheap round 22g rollers and see if the problem disappears.

Will wait until I've finished the engine work though.
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Mech 1 twa
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PostSubject: Re: 22 gram Dr Pulley Sliders - performance figures   Fri Apr 13, 2018 7:44 pm

There are 2 different things happening at the same time. Front pulley is contracting making it larger, rear pulley is spreading apart belt is riding lower. That's most likely why RPMs dip. at 50mph.
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