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Post by 90GTVert on Feb 4, 2011 16:44:12 GMT -5
I got the tach wire ran and took T2 into town, about 4 miles round trip. It's really dead below 5,000-6,000RPM, but I believe that to be at least partially from the tune. It's so rich that it's trying to die all the time at idle and I have to keep it cleared out at stop signs or red lights. Once it gets above that RPM, it pulls pretty strong and very smooth. I got up to 57MPH on the way from town to home at 9,760RPM. Once it got to around 9,600RPM it started feeling like it wanted to go, but couldn't. It's got a deep, rich, sound at those revs, so I'm thinking proper jetting will get me a little more revs. It pulled to at least 9,800 before without much trouble and has been over 10,000 at times I'm sure, and this setup is definitely better equipped for higher revs. Of course the CVT isn't setup yet either. All as built. I'm very happy with 57MPH sitting up on the initial rough tune with my 300lbs on flat land, sitting up. That's about what I could reliably expect from the last setup when it was in tune. ;D
I am getting annoyed by the open filter already. It's so loud after getting used to the SunL and the Venus with a stock airbox. I ordered some tubing from McMaster-Carr that looks much better than the small tubing I seem to find locally. Ordered yesterday, arrived today, standard shipping! I also ordered a 139QMB airbox, simply because I think it may look a little better mounted over the CVT and was only $15 shipped. I'll have to mod the stocker or the GY6 stocker to work with the tubing, so otherwise fit is no concern.
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Post by 190mech on Feb 4, 2011 16:57:46 GMT -5
Cool!Where did you find the airbox?As we all are growing in 2 stroke tuning,I'm sure T2 will run better than the last build!! :thumb:
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Post by 90GTVert on Feb 4, 2011 17:04:48 GMT -5
With me fiddling around and trying new things, I'm never too sure what's gonna happen.  I figured at very least the pipe mod would pay off to really let it flow as a "big" motor should. I picked up the GY6 intake from an eBay seller. I may be wrong about it looking better. I just think the long, skinny, design might look better over the CVT than the oddly shaped Mina airbox. It may look silly, who knows? cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=280444313297&viewitem=&sspagename=STRK%3AMEWNX%3AITI did manage to cram the stocker on the 25mm carb, but it just chugged out smoke and wouldn't rev. lol That kinda made me wanna keep the filter, but I feel like an ass sometimes in my small town with a loud open filter. |
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Post by 2strokd on Feb 5, 2011 6:42:56 GMT -5
Good to hear you are up and running pretty darn fast! And not even tuned yet! WoW!!!
Great work man! Yes, our lil 2T,s get real loud mouths without the proper coverage lol.
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Post by 90GTVert on Feb 7, 2011 14:51:14 GMT -5
I'm not really sure why, since I'm still waiting on the airbox I'm hoping to use, but I went out and swapped a few jets today. I tried 102 and 100 mains. Both gave good plug chops. The 100 hit almost 10,000RPM on the stretch I was testing on, the 102 just shy of 9,900RPM. With the 100 in, I started to hear a faint crackle on the way back. I'm not sure if it's leaner than it should be, or if I'm going to need to back off compression a little. Max speed was 61MPH.
I swapped the pilot from 72 to 68, because it was adjusted as lean as it could be with the 72 and still a bit rich. Now I think it's too lean, but I'm not gonna swap again till I see how it does with an airbox.
It's not looking like it's going to want to pull to 10,000 or beyond other than tucked down trying to make a top speed run or something. That puts my durations on the long side, although it's fairly strong once it picks up. There's definitely a "hit" now, where it starts to pull. It never really acted that way in the past, which I think could have a lot to do with making the header inlet the size it should have been before all the Euro approval stuff went into it. It may just be that this pipe doesn't like to rev beyond 9800-9900 to make power. I'm using 2 base gaskets, so I could probably add a head gasket and remove a base gasket if it starts to feel necessary after more tuning. That's probably not really a great idea though. Initial checking showed that I'd only drop 1 degree of exhaust duration, but about 5 degrees of transfer duration. Not sure it's worth it. We'll have to see what farther tuning brings, but I think if I had it to do again I might make the exhaust duration 192 to 194 max and I think it woulda matched up better.
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Post by 90GTVert on Feb 7, 2011 23:51:39 GMT -5
It was still 40 degrees at 11PM, so I was going to take a short trip on T2. Just a few miles. I stuck the stock airbox on to see what it would do with the current jetting and headed out. Coming out of the driveway I noticed the rattle type noise again. Within 1/4 mile it got much worse and turned into what I could tell was an exhaust leak. I turned around and came back, thinking I'd just tighten the header. It has eaten the paper portion of the gasket already. Looks like I need a new option for gaskets.  |
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Post by 2strokd on Feb 8, 2011 4:03:42 GMT -5
Ahhh man! I was hoping that was the ticket!
Excuse me for asking if its in the build thread, (my memory sucks) but what are the main diffs with the way its built now and the way it was?
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Post by 90GTVert on Feb 8, 2011 7:55:58 GMT -5
45mm crank, case matching and porting, higher port durations, a little more compression, and the port matched header.
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Post by 2strokd on Feb 8, 2011 8:17:24 GMT -5
This crank is a stuffer style and the old one was stock right? Stock 43mm?
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Post by 90GTVert on Feb 8, 2011 8:52:15 GMT -5
Correct.
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Post by 2strokd on Feb 8, 2011 8:57:33 GMT -5
Thanks! I can see you hitting 70+ with this!
I know you, and you will tune till it blows, or goes
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Post by 90GTVert on Feb 8, 2011 9:12:32 GMT -5
lol I don't know if gearing will allow me to ever hit better than 65 like I did before. Mainly it's pulling harder to get me to 60 than it used to, so it would be better for average speeds. I'd like to see more MPH for no practical reason, just because... but I don't have any plans to swap gears. I really think I'm too fat for that. I just can't see it being practical for someone that's almost 300lbs to use speed gearing. Headwinds and hills would kill me. I've been looking around at gasket materials, but not finding much I like. I like the gasket from VT Cycles that came with the Phongeer pipe. It had a copper ring to keep the gasket intact around the header. They are expensive though and wouldn't match up as well as a custom gasket. I was thinking copper or multi-layed aluminum that crushes when torqued. I use the aluminum on my car's headers and they work very well and are good for multiple uses. Sounds hard to make though. I might just try Ultra Copper RTV. It works on my turbo's flange, might be the ticket here. Sure would be a lot easier to cut.  |
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Post by lshigham on Feb 8, 2011 9:20:00 GMT -5
lol I don't know if gearing will allow me to ever hit better than 65 like I did before. Mainly it's pulling harder to get me to 60 than it used to, so it would be better for average speeds. I'd like to see more MPH for no practical reason, just because... but I don't have any plans to swap gears. I really think I'm too fat for that. I just can't see it being practical for someone that's almost 300lbs to use speed gearing. Headwinds and hills would kill me. I've been looking around at gasket materials, but not finding much I like. I like the gasket from VT Cycles that came with the Phongeer pipe. It had a copper ring to keep the gasket intact around the header. They are expensive though and wouldn't match up as well as a custom gasket. I was thinking copper or multi-layed aluminum that crushes when torqued. I use the aluminum on my car's headers and they work very well and are good for multiple uses. Sounds hard to make though. I might just try Ultra Copper RTV. It works on my turbo's flange, might be the ticket here. Sure would be a lot easier to cut. Couldn't you try a sheet of 2-3mm alu cut to size? It'd be a bit of a pain to make, but wouldn't melt. |
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Post by 90GTVert on Feb 8, 2011 9:36:02 GMT -5
Yeah. I was thinking thinner than that for a single layer so it crushes. Something like 24ga (.5mm). I believe the Copper RTV will be my first attempt though. Thinking back, I did use it with success on the SunL's header at one point.
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Post by lshigham on Feb 8, 2011 9:38:32 GMT -5
I've been using 250*c RTV on my exhaust for a while now, as the O ring did a runner. The copper version is 350*c, I believe.
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