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Post by jaxco on Aug 17, 2009 9:17:55 GMT -5
Nitrous plans are not any time in the near future, just think it is feasible. Would have to remove the secondary air injection system before even thinking of such a modification. I have heard of other bikes that have a "pair system" attempting to run nitrous and when the bikes "backfire" the secondary air injection system would allow for an explosion through the reed valve under the seat. Big fireball between the riders legs.
Speaking of which...has anybody removed the secondary air system on these scoots?
Considering the fact that we have this smog equipment on the bike...does that mean that hidden in our "factory performance exhaust" is possibly a catalytic converter? Just wondering why they would bother with a secondary air valve unless there is some means of burning more unburned fuel in the exhaust...unless it is still hot enough to reignite without a catalyst by simply introducing clean air. Or is it something that helps the grounded oxygen sensor function?
I do notice the secondary air system is hooked up to the ECU and wonder how it could be removed/disabled without throwing a CEL light on the dash. Maybe a resistor in one of the wires? Any thoughts?
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Post by jaxco on Aug 17, 2009 9:27:37 GMT -5
Anybody fabbed up an aftermarket intake or bolted on an exhaust to one of the MS3/Xpeeds yet?
Could be worth it.
Since my plug was black and a little sooty I am thinking it runs a tad rich, allowing more air may lean the mix some and give it a bit of pep. Who knows, I might just need to clean/oil my filter again...
Anybody who has cleaned the air filter (sponge) knows how restrictive the factory intake is...on the dirty side of the filter is a tiny hose that all of the incoming air has to funnel through.
For an experiment and since I have the most beat up but still running MS3/Xpeed 250 I think I might take a dremel or other cutting tool to the cover of my air filter for the purpose of allowing less resistance for the air going through the sponge. It will probably double the amount of noise though. Anybody want me to attempt this?
On the exhaust side...Has anybody found a slip on muffler that would fit/reduce weight/increase flow and performance?
The MRP video suggests an exhaust modification...but fails to elaborate on a muffler or part number.
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Post by jaxco on Aug 17, 2009 9:45:21 GMT -5
Since we have an air intake temperature sensor-has anybody tried to trick it with a resistor.
Interesting things resistors...
-Folks looking to increase mileage trick the vehicle into thinking ambient air is MUCH HOTTER than what the engine is really ingesting-this causes a lean condition but also provides better mileage for economy cars. There are lots of "green" forums with small econo car owners that speak of this.
These guys also run hotter plugs and restrict airflow in an attempt to get the most mileage from their vehicles.
On the other end of the same issue...
-Folks looking for more performance want to trick their vehicle into running a little on the rich side. These people use a resistor that makes the ecu think ambient temperature is MUCH cooler than what the engine is actually ingesting...then they find a way to introduce more air to burn the added fuel (intake/free flowing exhaust/forced induction/N2O) which in turn supplies more power (lower mileage though.)
The danger is going too extreme with the resistor. Lean the mix too much...burn out the motor. Run it too rich...buying oxygen sensors and plugs monthly,er, um...and wasting expensive gas/oil/polluting more. Run it too rich and run the risk of washing and scoring the rings on the piston/scouring cylinder walls.
Any thoughts on these ideas?
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Post by jaxco on Aug 17, 2009 9:56:20 GMT -5
A little disclaimer: I consider my posts public information and if anybody wishes to cross post anything I have written in this forum please do so with my blessing. I would love for some more discussion to happen in any other forum as well as this one if it can lead to performance or economy improvements for the scooter that I own.
You can cut and paste my ramblings to post on other forums in the interest of improving the joy of ownership of the Hyosung MS3-250/UM Xpeed-250i.
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Post by harrywr2 on Aug 17, 2009 10:06:16 GMT -5
Since my plug was black and a little sooty I am thinking it runs a tad rich Or a tad cold....I'm running a CR7E plug rather then then the stock CR8E plug....getting 75+ MPG. The O2 sensor should be correcting for any lean/rich condition in closed loop mode. My theory is that ethanol fuel burns a bit cooler then straight gasoline so a slighter hotter plug is needed. Page 2-10 of the service manual does specify 3 different plugs. A 7,9 or 9 heat rating. |
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Post by jaxco on Aug 17, 2009 10:16:15 GMT -5
Since my plug was black and a little sooty I am thinking it runs a tad rich Or a tad cold....I'm running a CR7E plug rather then then the stock CR8E plug....getting 75+ MPG. The O2 sensor should be correcting for any lean/rich condition in closed loop mode. My theory is that ethanol fuel burns a bit cooler then straight gasoline so a slighter hotter plug is needed. Page 2-10 of the service manual does specify 3 different plugs. A 7,9 or 9 heat rating. I thought ethanol also leaned out the mixture, maybe I have it backwards. |
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Post by jaxco on Aug 17, 2009 10:17:51 GMT -5
Since my plug was black and a little sooty I am thinking it runs a tad rich Or a tad cold....I'm running a CR7E plug rather then then the stock CR8E plug....getting 75+ MPG. The O2 sensor should be correcting for any lean/rich condition in closed loop mode. My theory is that ethanol fuel burns a bit cooler then straight gasoline so a slighter hotter plug is needed. Page 2-10 of the service manual does specify 3 different plugs. A 7,9 or 9 heat rating. Might be, For some reason I thought ethanol leaned out the mix, I know it lowers mileage in my cars. |
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Post by harrywr2 on Aug 17, 2009 11:04:35 GMT -5
Might be, For some reason I thought ethanol leaned out the mix, I know it lowers mileage in my cars. Ehtanol = C2H6O Gasoline = C8H18 (kind of an average) The extra oxygen molecule in ethanol makes the mixture look leaner to the O2 sensor. The other side is ethanol has 30% less energy content then gasoline. |
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Post by jaxco on Aug 18, 2009 12:51:54 GMT -5
Took a drill saw to the outside of my filter housing today to allow it to breathe more air. Sounds good. I weigh 350lb so really can't say anything for "seat of the pants feel." The stock airbox breathes through a 3/4 inch snorkel. I cut a 1"x3-4" rectangle into the bolted on side of the air box allowing more cool outside air to hit my oil soaked sponge filter. It sounds nice and "seems" faster...but sound can really infuence first impressions.
Eventually going to replace the airbox/stock filter with a chrome tube and conical air filter.
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Post by jaxco on Aug 18, 2009 12:55:48 GMT -5
Took a drill saw to the outside of my filter housing today to allow it to breathe more air. Sounds good. I weigh 350lb so really can't say anything for "seat of the pants feel." The stock airbox breathes through a 3/4 inch snorkel. I cut a 1"x3-4" rectangle into the bolted on side of the air box allowing more cool outside air to hit my oil soaked sponge filter. It sounds nice and "seems" faster...but sound can really infuence first impressions. Eventually going to replace the airbox/stock filter with a chrome tube and conical air filter. Also planning to replace my stock exhaust, I think a single muffler from a Harley Sportster would clamp onto the pipe and provide better flow. I seem to recall it has a 1 3/4" slip on connector. Ours is either 1 3/4" or something close. If that doesn't work I can always put high heat paint on a glasspack or find a chrome slip on glasspack muffler. Yes, I am watching craigslist for such a muffler. Wouldn't be bad to pickup 2 for $40...then I could just offer the other for shipping cost to anyone interested if it works for me. |
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Post by jaxco on Aug 18, 2009 13:01:08 GMT -5
Might be, For some reason I thought ethanol leaned out the mix, I know it lowers mileage in my cars. Ehtanol = C2H6O Gasoline = C8H18 (kind of an average) The extra oxygen molecule in ethanol makes the mixture look leaner to the O2 sensor. The other side is ethanol has 30% less energy content then gasoline. You make an interesting point here. I am still going to try the Iridium cr9 cooler running plug as I hope to open up the intake and exhaust. I will hold on to my CR7E Though just in case your "cold" theory holds out. |
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Post by jaxco on Aug 18, 2009 13:06:21 GMT -5
Put my bike on centerstand today and found rev limiter under a "no load" condition (back wheel free spinning in air.)
It could be the rev limiter or pre-ignition due to higher temp range plug...anyway, about 9500 rpm.
I plan to disconnect the black/white line attached to the negative wire and see if this gets rid of the rev limit. Should be able to test theory tomorrow.
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Post by jaxco on Aug 19, 2009 18:33:20 GMT -5
Put my bike on centerstand today and found rev limiter under a "no load" condition (back wheel free spinning in air.) It could be the rev limiter or pre-ignition due to higher temp range plug...anyway, about 9500 rpm. I plan to disconnect the black/white line attached to the negative wire and see if this gets rid of the rev limit. Should be able to test theory tomorrow. Ok, Checked it again and revved it up on stand SLOWLY. It revvs to just past 10,000 rpm. The red line is 10,500 so it may just be a safety thing to keep from fragging the engine. Disconnected the black/white lead and still same effect so plugged it back up and motored on. One high revving little 250 scoot. |
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Post by astroprof on Aug 24, 2009 14:27:21 GMT -5
OK - the scoot has become my preferred means of transportation. I admit it.. Dr. Mom now asks of I'm taking it when I go somewhere. Running up to campus and the store aren't as much fun as open road riding so I'm sneaking in some longer rides. Amazingly we've had 3 nice Sundays in a row - wow! I already posted about 1 of them so here's the other 2. Last Sunday. I took a break from prepping for the start of classes and took a ride. I left my place, ran up through the Galleria (early before the homicidal cagers were out). Weather was perfect - sunny, not hot. I went out past our airport on "Airport Road" - good road with curves and straights but a little bumpy. I picked up PA 53 to South Fork - again ok road but bumpy. From there I jumped on PA 869 to the little town of St. Michael. From there I rode up to the 1889 Johnstown Flood Memorial. Nice road but the speed limit thru the various parks is 15 and that's a little tough in terms of curves and handling speed. Got up to the Memorial and took a couple pix, talked with some folks from down near Philly. I called Dr. Mom to tell her I was headed back home. She suggested that I try US 219. It always seems a little strange when she encourages me to ride the super slab. She's either gained a lot of confidence or maybe I shouldn't have told her how much she gets if I croak off. Anyhow, I gave in to temptation and took 219. It was kind of fun to see the cagers when I was doing 70 going up the 3 mile hill on a scooter. I held to that because the windscreen was vibrating at that speed. I slowed down when the limit dropped from 65 to 55 because the troopers like to hide in the trees in the median strip. Got off at the Galleria exit and headed home. 24 mile trip. At the faculty meeting the other night, I was talking bikes with an old grad school carpool buddy who's with he Math dept. He said give him a call sometime and we'd ride. Yesterday morning was nice and I called him and said I was going for a ride and would he be home. He said come on over. I left at 10. Rode thru town and across the valley to the other hill. Got to his place and he said "let's ride" but he needed to pick up another bike. We went to his "barn" near Davidsville and picked up his old Honda Custom 250. He was being charitable and matching engine sizes. We went back into Davidsville and took back rods (lot's of hills and curves) thru a little town called Seanor, crossed the Stony Creek River and rode on to the town of Windber. From there we road different back roads to PA 403 near Davidsville. At that point we split up. The weather was getting threatening and I needed to cut the grass. Headed for home. Had a great time and ride. I didn't set the trip but based on the odometer, it added up to about 50 miles. We'll try to get out again as schedules permit. Pix are from the 1889 Flood Memorial.   |
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Post by ouachita on Aug 25, 2009 7:19:03 GMT -5
"...maybe I shouldn't have told her how much she gets if I croak off. "
LOL --- Never be worth more dead than alive!
Looks like a fun ride.
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CAN YOU HELP ME OUT MAN,AS i LOST ME JOB DUE TO NOT BEING ABLE TO GET THERE?ANY INF