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nutty boy Sargeant
Joined: 16 May 2007 Posts: 66 Location: cardiff
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Posted: Wed May 30, 2007 5:04 am Post subject: |
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I had a scop on my gt 200 was getting louder by the day had it repacked and no difference got a pm on my gts250 and thats loud but the down pipe is a right pain the arse to try to get off because of the welds |
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shovell troop
Joined: 30 May 2007 Posts: 33 Location: cambs
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Posted: Wed May 30, 2007 5:58 pm Post subject: why does my gts judder |
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why does my gts judder and the pm pipe back fire when the scooter goes over 90mph when the standard exhaust was on it run fine at 95mph apart from the exhaust the rest of the scoo is untouched |
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CheekyThomas Guvernor
Joined: 18 May 2007 Posts: 1374
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Posted: Wed May 30, 2007 6:03 pm Post subject: |
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Changing the exhaust has altered the fueling, and it sounds to be needing a little tweaking in the higher rpms. |
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Outlaw Inspector
Joined: 16 May 2007 Posts: 452 Location: Sitting at the Rugby Club Bar
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Posted: Wed May 30, 2007 6:51 pm Post subject: |
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Had my Scorpian fitted since last August when i bought the scoot and have had no problems up to date ,know i've said that watch the bastard thing go on me . _________________ Whats a Clutch !!!! |
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buddyphil Site Admin
Joined: 14 May 2007 Posts: 265 Location: page 34 febuary edition of scootering magazine
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Posted: Wed May 30, 2007 6:55 pm Post subject: |
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judderin sounds like the rev limiter |
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shovell troop
Joined: 30 May 2007 Posts: 33 Location: cambs
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Posted: Wed May 30, 2007 7:20 pm Post subject: |
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buddyphil wrote: | judderin sounds like the rev limiter |
and how can i alter the rev limiter |
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buddyphil Site Admin
Joined: 14 May 2007 Posts: 265 Location: page 34 febuary edition of scootering magazine
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Posted: Wed May 30, 2007 7:34 pm Post subject: |
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ahhhhhhhhhh
that is the magic question
seriously i dont think you can
i could do with moving it up a bit as could every gts owner
in the country |
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delmalossi Sargeant
Joined: 27 May 2007 Posts: 91 Location: tadcaster
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Posted: Thu May 31, 2007 7:22 pm Post subject: |
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i was hitting the rev limiter @ 85mph then put the mod and pipe on and hitting it @ 90-93. just put the kevlar belt and veariator on went to kelso and not hit it yet.95+ on a1 taking over the power rangers,,, that pissed em off _________________ ride it like you stole it |
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CheekyThomas Guvernor
Joined: 18 May 2007 Posts: 1374
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Posted: Thu May 31, 2007 8:56 pm Post subject: |
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Adding a race pipe wont move the rev limiter...
If it was on the limiter at 85mph with std pipe, it will be on the limiter in the same conditions at 85mph with any exhaust fitted.
The only thing to effect the speed possible at the rev limiter is final drive ratio and drivebelt condition. |
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delmalossi Sargeant
Joined: 27 May 2007 Posts: 91 Location: tadcaster
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Posted: Thu May 31, 2007 9:13 pm Post subject: |
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had belt and rollers done @ chisle speeds on the dyno it put 6mph on the bike and the rev limiter comes in later _________________ ride it like you stole it |
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CheekyThomas Guvernor
Joined: 18 May 2007 Posts: 1374
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Posted: Thu May 31, 2007 9:38 pm Post subject: |
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No rev limiter will still come in at exactly the same RPM... only the ECU controls the rev limiter. Its a fixed factor.
If it seemed to do reach a higher topspeed before coming in, it meant your old belt was slipping. But the actual RPM it came in at will be EXACTLY the same. |
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smirnoff Site Admin
Joined: 14 May 2007 Posts: 1125 Location: On the bouncy castle in my head.
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Posted: Fri Jun 01, 2007 11:59 am Post subject: |
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NO NO NO, The rev limiter cuts on engine revs irrespective of where the drive belt is on the pulleys. If you put 6 gram rollers in it would you expect the same top speed as 14 gram.........Changing the belt will make a difference, as will rollers, as will an increase in power. The max speed is acheived at the very edge of the variator pulley. _________________
PHIL.... |
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CheekyThomas Guvernor
Joined: 18 May 2007 Posts: 1374
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Posted: Fri Jun 01, 2007 1:01 pm Post subject: |
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Thats what i said
Fitting exhausts, or belts etc wont move the rev limiter, its a fixed factor built into the ECU programming.
Quote: | had belt and rollers done @ chisle speeds on the dyno it put 6mph on the bike and the rev limiter comes in later |
So i was saying this quote is wrong the rev limiter will be coming in at exactly the same RPM as before, if it seems to have been raised as its now doing a higher speed, then the old belt must have been slipping allowing the engine to rev higher.... For example only
85mph @ 8,000 rpm but with new belt its doing 90mph @ 8,000rpm as it was loosing 5mph at the same rpm through the worn belt slipping slightly due to reduced width. |
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CheekyThomas Guvernor
Joined: 18 May 2007 Posts: 1374
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Posted: Fri Jun 01, 2007 1:19 pm Post subject: |
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smirnoff wrote: | If you put 6 gram rollers in it would you expect the same top speed as 14 gram. |
If you added a matching contra spring and didnt suffer belt slip as a result, and the engine had enough torque to be able to take the higher gearing so quickly, then yes you would get the same top speed.
Roller weight VS contra spring tension contol rate of gear change only... not actual topspeed. Go put 20gram rollers in, it wont be any quicker than with 14grams. As if the belt can get to the outer edge of the pulley its at its maximum speed.
Top speed is determined by Torque and drive ratio. The more torque you have, the higher gearing that can be run, the higher gearing means higher speeds. |
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smirnoff Site Admin
Joined: 14 May 2007 Posts: 1125 Location: On the bouncy castle in my head.
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Posted: Fri Jun 01, 2007 4:30 pm Post subject: |
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Thats me shot down in shit then. Funny how my gts wouldn't pull 9 grm rollers though, and goes like fook on 14s. so what was i doing wrong? _________________
PHIL.... |
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