Dr Pulley 20x12 14GR

[TANWare]

I am 240+ LBS of a rider and I get usually just shy of 90 MPH. I have seen 90+ but that is not sustained as on an upgrade I will loose that. All I can say is faster than I ever want to go on a scooter.

[Cortez]

Oh well then I guess it's normal, especially if you can't reach 8000 either, I figured the extended
gearing at the top end would not be extreme enough to cut down the top speed, but I guess 13gr
or 13.5gr is needed to get that 5mph that's missing, but I don't want more revs below 55mph so
I'll just stick with 14gr.

The acceleration at 6500-6600 WOT seems like it should have been there in the first place.

I'm now rather sure that 15gr sliders wouldn't work all that well, and the bike would probably hit a
wall at something like 80mph @ 6500 rpm.

I wonder what a taller windscreen will do (got it on order), and I'm looking for cheap hand guards too,
if the windscreen doesn't reflect enough air from the hands (and it should).

[TANWare]

The air resistance at that speed probably holds us back, the 15GR would definately help if there is a tail wind. The 15GR would also help MPG a bit but I am not sure how much or if it would make up for the loss in the extra umph we get. t would definately lower RPM's all around but this can be more personal taste as the 14GR's seem to get us right on the pipe and optimal RPM range.

My personal choice is to leagve the bike at its most efficient rather than the better MPG. If it were a real torque monger the story may be different but alas it isn't. Again though for a single 300cc bike it does quite well...............

[Cortez]

The air resistance at that speed probably holds us back, the 15GR would definately help if there is a tail wind. The 15GR would also help MPG a bit but I am not sure how much or if it would make up for the loss in the extra umph we get. t would definately lower RPM's all around but this can be more personal taste as the 14GR's seem to get us right on the pipe and optimal RPM range.

My personal choice is to leagve the bike at its most efficient rather than the better MPG. If it were a real torque monger the story may be different but alas it isn't. Again though for a single 300cc bike it does quite well...............

Yeah, I keep telling myself that it just 300cc, and then it's performance with 14gr is really amazing.
I keep comparing it to 500cc scoots that I tried and tend to forget that there's some extra hp there,
but more importantly - more torque.

I think that 15gr sliders would make the top speed even lower.
If the bike can't rev over 7600rpms at 86-87mph now, I think we'd be lucky if it even reached
87mph with 15gr sliders, but I guess if it would, it would be at ~300 revs less then now, saving
fuel again.

Long story short, I'm sticking with 14gr, I might even consider ordering specially made 13.5gr, but
14gr seems perfect, hitting just over max torque spot (6600-6700) at WOT, and 75mph at 6500
(7000 with stock rollers) is also perfect.

Can we mix the sliders?
I know they can make the 13.5 on special order, but we could mix up 13gr and 14gr..
I guess that would equal some 200 revs more from 0 to top speed, which could result in a
higher top speed too.

[TANWare]

if you use 13 and 14 stagered to ballance it out you can mix them but you are better off with proper sliders as the primary load is on the 14's when you stager them. I do like the lower rev's and this would be the reason for 15GR's. I doubt we can get muck more top end. As mentioned we just do not have the torque.

With a true transmission with clutch and gears there would be less loss and the direct conection allowing both better accelleration and more top end. The problems then arise with ease of use etc. 

[Cortez]

I just spoke with a local rider who has 13gr sliders.

He knows nothing about the revs (says he never looked at the thing once), but
swears his scoot wiil do 96-97mph indicated.

And I've seen 96mph on a test scoot with half-worn stock weights, but it was running at 8600.
That's why I figured we should get AT LEAST 92-93mph.

[zombie]

You can take the cores out of your rollers/sliders to use otherwise useless parts. Knock them out, and put them in whatever. You can also fill your light rollers/sliders with solder or epoxy, and drill out the excess to get the weight you need. Rough up the barrels with 80 grit paper first.

[modmaster]

This question is for Tanware or Cortez. I sent an email to Paul Wu at Union Materials, the maker of DRPulley sliders. He said that the stock size of rollers for the GTi300 are 23x18. How can this be? On your threads in the Downtown 300 forum you say that you use 20x12 size sliders at 14gr weight. Are the rollers that much different in size or is he wrong. I'm a bit confused. I already ordered a set of 20x12x15gr for my 300GTi. Can you clarify this for me? Do I have the right size sliders?

modmaster

[juanpauk]

Hi modmaster,

The People Gti is knows as Shadow in Asia so this might have led to confusion, as you can see in this link they use the 20x12 rollers and also you can find a lot of information about the experience with 14grams and 15grams

http://translate.googleusercontent.com/translate_c?hl=en&prev=/search%3Fq%3D%2522people%2B300%2522%2Bgti%2B%252B%2Bdr%2Bpulley%26hl%3Den%26biw%3D1280%26bih%3D855%26prmd%3Dimvns&rurl=translate.google.co.uk&sl=de&u=http://zzip.de/forum/viewtopic.php%3Ft%3D7862%26sid%3Db49e579e595ecc34c795996687c45456&usg=ALkJrhiqdve9zzLMm6n03QILJNSXg-dxmw

Hope it helps

And the list of rollers by model:
http://www.drpulley.info/drpulley_docs/Typenliste.pdf

[Cortez]

This question is for Tanware or Cortez. I sent an email to Paul Wu at Union Materials, the maker of DRPulley sliders. He said that the stock size of rollers for the GTi300 are 23x18. How can this be? On your threads in the Downtown 300 forum you say that you use 20x12 size sliders at 14gr weight. Are the rollers that much different in size or is he wrong. I'm a bit confused. I already ordered a set of 20x12x15gr for my 300GTi. Can you clarify this for me? Do I have the right size sliders?

modmaster

Relax, you ordered the correct size.

[modmaster]

Thanks for getting back to me. WHEW! Will let you know how they work after I get a chance to install them.

modmaster

[racewalker]

Let me know how they work for you. I have 14g in my DT300I and I am not happy with them. I have lost top end and gas mileage as well. I am not sure if I am going to put in 15g or go back to the rollers.

[Cortez]

Let me know how they work for you. I have 14g in my DT300I and I am not happy with them. I have lost top end and gas mileage as well. I am not sure if I am going to put in 15g or go back to the rollers.

The DT300 has a different variator, so 15gr in the People is more or less similar to 14gr in the DT.

My top speed remained the same, or -1-2mph, and not that I'd use that speed since it was over 8000 revs
with the stock weights and that can't be healthy. You'd probably loose even more with 15gr.

And fuel consumption on mine has been fantastic, but a bit better then on yours.
Looking at your fuelly, if you have that kind of MPG figures on 90% open roads (and if it's above 60mph), you'd
have even worse with stock weights because the bike would rev more.

[racewalker]

If you look at my fully from last year you will see what I am talking about. Last year with the rollers in I could start out passing a car at about 60 mph and be doing 85mph when I got in front of him. Couple of days ago I passed a car doing about 60 mph and even after I was past him I still wasn't at 75mph. I am doing a trip tomorrow with it, if it is not better I will put the rollers back in on Monday. I don't care if it is running 8500 wot. My other scooter ran wot all the time on the hi way with no problem. It still runs like new with over 30000 k.

[Cortez]

At 60mph the stock roller bike will accelerate using torque/power available at around 5600rpms and it'll get better after
6000 and 65mph, but by the time it reaches 65, mine will be at over 70 with the 14gr pulleys.

I've done a lot of research on this, made a couple of videos of before and after and especially acceleration at speeds
between 50 and 60mph is better with the sliders. I'd even like 13gr for the WOT acceleration better, but.. it would mess
with the cruising revs at under 50mph too much.