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fenwik
12-15-2002, 08:46 AM
Hi !
I wanna know how high do you have set the red flash light of your RS 250...Mine is at 12000rpm....
Thanks !
Yann

12-15-2002, 09:07 AM
dont have the light as mines a 96 but power really drops off after 11,000 so i have a bit of tape as 10,500 and when the needle disappears i shift up.

fenwik
12-15-2002, 09:10 AM
Hummm...Strange...
My RS 250 is a 99 with arrow exhausts and the power keep climbing to 12000rpm...
bye,
Yann

Duc995
12-15-2002, 10:19 AM
If you consult a dyno sheet you will find that the max HP will fall off as you pass 11,000. Revving consistently towards and beyond 12k has been documented over and over agin on this forum to get you a toasted top end and piston failure! Enjoy...:lol:

fenwik
12-15-2002, 10:52 AM
After reflexion....You're right, power seems to decrease after 11000rpm, but I wonder if it apply with Arrow exhaust, I think Arrow exhaust move the max power to 12000rpm...Must verify this...
bye,
Yann

moggitinik
12-15-2002, 12:15 PM
I've got mine set at 11,250 - this is when the power on mine starts to tail off. I only use higher revs if me or the bike are to busy for an upshift - no need to flog it all the way to the limiter.

Stu Jones
12-15-2002, 02:57 PM
The arrows exhaust don't let the engine rev any higher or at least make power any higher. The only pipes that do this are either the proper Suzuki/Sugaya kit ones or Cougar (Jim Lomas) pipes. Even then it is the igntion that stops any more power at high revs unless you fit the Suzuki race kit SAPC box. There is no rev limiter, the standard box just retards the ignition to stop it making power.

fenwik
12-15-2002, 03:25 PM
But what about that :
www.search.com/click?sl,m...e_9x%2Ehtm (http://www.search.com/click?sl,marin.1.channel.28-296.0.1.SAPC+aprilia.0,http%3A%2F%2Fwww%2Ergv250%2 Enet%2FErfahrungen%2FSeite_9x%2Ehtm)

68,8 PS / 12483 rpm
39 Nm / 12289 rpm
22D70 black box like my own RS 99 !
???
Yann, webmaster of www.rsbikers.com (http://www.rsbikers.com)

Stu Jones
12-15-2002, 04:56 PM
I suspect the horsepower figures quoted are at the crankshaft not the rear wheel, but even with that it is impressive. Very small main jets to be getting that amount of horsepower though, a fully kitted RGV normally runs 400+ main jets.
My German is no good so I can not see if they have manualy advanced the ignition or not. Can any body read this?

fenwik
12-15-2002, 05:51 PM
Seems like this dyno test was taken at the rear wheel because it's quite difficult to take the horsepower at the crankshaft, have to disassemble the motor...:\
Jets are 310/320...These are the recommended ones for Arrow exhausts...
They don't have done any manual ignition modification, they've just replaced the black box for a 23D70 (RS250 >98) instead of the 22D90 (RGV 92') and replaced original exhausts by Arrow...
bye,
Yann

Stu Jones
12-16-2002, 01:33 AM
The print out looks like it could be from a Fuchs dyno. This is the same type as I use and they do measure back to the crankshaft as they measure losses on the slowdown run.

Yammyfan
12-16-2002, 06:49 AM
I set mine at 11,300, for a planned ceiling of 11,500. Power drops drastically to 12K, so Ionly use the last 500 for overrev. And yep, they seem to die young if revved over 12.....

gixer119
01-13-2003, 03:54 PM
My red line is set at 12,500 but my bike is being dynoed at the moment as i have fitted an arrows system on it so i will know where the max power is then,

Gixer

ecumike
01-13-2003, 04:46 PM
Same here as Yammyfan

fenwik
01-13-2003, 05:00 PM
Hi Gixer119 !
Don't forget to tell us the result, and the dyno curve !
I'm very interested in your dynotest because I've got Arrow pipes too ! ;)
Thanks in advance...
Yann

monson708
02-23-2003, 11:27 AM
a stock cup bike with stock exhaust makes peak power @ 10,800rpm and falls off like a lead ballon after that.aarow exhaust gives you about 1 peak hp but allows the engine to contiue to make power till 11,200rpm with a stronger over rev.
the main reason is cause the aarow stingers are larger in diameter.also there are at least three differant aarow systems.the main differance is the first piece of stinger that is welded to the rear cone.its about 28mm long and it is actually a small venturi.the majority of arrows are the same but you can get the venturi in a larger inside diameter.i believe its .050" larger.this piece in effect makes the stinger feel smaller at lower rpm but at higher rpm it creates a venturi effect speeding up the air making it feel larger.this is because a small stinger makes more bottem power and a large one makes a stronger over rev. .i got the part right from aarow and i was told that it was illegal in some countries for cup racing.

Stu Jones
02-24-2003, 01:22 AM
Monson what does the 316 rev to, ie where does it make its power?

monson708
02-24-2003, 11:26 AM
peak power is @ 11,200rpm but it revs past 12,000rpm with ease.i never rev mine over 12,000rpm but the 316cc makes 22 more hp than a stock one @ 12,000rpm so if you had a gearing situation that you only needed a few more yards and didnt want to do the extra shifting(ie.time) you can.in a situation like daytona the wind is in your face on the back straight so you cant shift into top gear but on the front you can rev out 6th gear over 12,000rpm especially if you pick up a draft.my first time @ daytona w/ a 316cc i pulled out of a draft to past an SV700 and when i got in the dirty air my front fender exploded.scared the crap out of me!i thought my front tire blew cause it sounded like a gun shot and my front tire slid a bit at first.i was going 165mph on my speedo at the time.

dowzerr
04-15-2003, 04:21 PM
I have mine set at 11500rpm, but it will rev to 12000+ if needed. I have a Giannelli full system (rare) got em coz every man and his dog has Arrows. I also have a trick ignition now that makes it rev higher and gives a smoother curve. My friend has the same ignition with Arrow pipes and his bike doesnt rev as high.

wytze
04-24-2003, 07:09 AM
i got a rg factory kit exhoust and matching sapc box off some bloke that races rgv's and rs's and mine keeps on building till 13.000 and over, but i shift between 11.500 and 12.000 couse i dont want to kill her....

keean
07-16-2003, 03:09 AM
I have been told recently keeping revs below 11,000 will result in pistons lasting about 15,000 miles, wheres holding the engine at 12,000 will get you about 150 miles! From this it would seem that 11,500 would be a sensible red-line, but seeing as it takes a few milliseconds to react to the flashing light, setting it at 11,000 will probably get you to change at about 11,500. Also nothing stops you from using over-rev - you will just have to put up with the flashing light reminding you of the extreme engine wear going on...