Kaos
Scoot Enthusiast
Posts: 185
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Post by Kaos on Feb 15, 2023 11:51:16 GMT -5
This scooter is getting funny, take a simple 1 cylinder engine and turn it into the most complex over engineered vehicle ever.😀🥰 Stand alone twin fuel turbo charged tuned exhaust land craft 😎 👌 Ohh, and add in eco friendly low emissions renewable resources, corn fed e85 baby 👶 For real, this thing has gotten more complex than the track cars I've built! I think its a lot of fun though, as you never see this sort of thing on 2 wheelers of any sort with the exception of maybe the Turbo Hayabusa guys and they're going for a lot lower boost due to having like 3x the CC's I have. Its been really interesting to see how far this thing is capable of going, and how much potential there can be in there with the right technology. I've done things on this build I've never had a chance to play with on bigger vehicles before. About the only things I don't have enabled on the ECU right now are electronic boost control, rolling idle fuel cut(Cut fuel when not on the throttle rolling down hill for fuel savings) and launch control, which might be tricky with a CVT. If I can sort out the last couple things plaguing me like the clutch, this is going to be a really well dialed bike thats going to be way outside the performance range of most everything you can get on the market. |
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Kaos
Scoot Enthusiast
Posts: 185
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Post by Kaos on Feb 15, 2023 16:05:58 GMT -5
So status update on the new pipe. It sucks. I hate it. I'd throw it in a garbage dump if that wasn't an insult to garbage dumps.
Its basically killed all but the mid-range on the bike pretty badly. It falls on it's face totally around 65-70MPH. Its a lemon.
Sooo I'm back to the drawing board. I fabbed up a larger diameter straight pipe this afternoon, I went from a 1.5 inch pipe to a 2 inch pipe, this dropped the volume a little and made the note deeper but isn't nearly as quiet as it needs to be. I cut the end pipe baffle outa the muffler and sorta clamped it into the end of the straight pipe with some vice grips which resulted in a MUCH quieter pipe. So I think I may just need to find a clip-in baffle for a 2 inch pipe and I'll be ok. Off to the motorcycle shop again!
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sinfull
Scoot Enthusiast
Posts: 413
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Post by sinfull on Feb 16, 2023 3:43:12 GMT -5
Weld a metal whistle into the end of the pipe, that was funny for about a few days till I got annoyed with it myself 😀
Tell the neighbors be glad that I am trying to be considerate because I can make it even worse 😈
On the other side, have you ever seen the inside of a muffler ?? You could actually try that with your 2 inch pipe. Basically cut it enough to weld in 2 of 3 small angles that the exhaust flows around and cancels the wave. I am sure there is more to it but I have cut open a Flowmaster muffler and only thing inside was 3 angles point against the exhaust flow. Flow in <<< flow out. Rest was just empty, sure there is a science for it, but it is something to consider
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Post by 190mech on Feb 16, 2023 5:11:28 GMT -5
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Post by bigmatthew86 on Feb 16, 2023 10:51:27 GMT -5
I feel like a used performance pipe off a dirt bike would work nice. Most are straight through but have some packing to take the edge off a little. Can get them pretty cheap on eBay. Bonus is they give you that race bike look.  |
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Post by Lucass2T on Feb 16, 2023 13:48:21 GMT -5
I feel like a used performance pipe off a dirt bike would work nice. Most are straight through but have some packing to take the edge off a little. Can get them pretty cheap on eBay. Bonus is they give you that race bike look. Thats a 2 stroke silencer lol. It will burn up after one blip of the throttle😆 |
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Post by bigmatthew86 on Feb 16, 2023 14:32:42 GMT -5
I mean get one for a 4 stroke or just replace the packing with 4 stroke packing. I also like to pull the packing & replace with steel wool. You’re good to go after that.
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Kaos
Scoot Enthusiast
Posts: 185
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Post by Kaos on Feb 16, 2023 19:38:47 GMT -5
Found a good solution to the noise problem...  A dirt bike baffle wrapped in muffler packing in the end of the straight pipe! This worked well to get the noise down, and didn't seem to affect power much. I also switched from 10g sliders to the 11.2g stock rollers to keep from bouncing off the rev limiter which also seemed to help without having a massive affect on the lower end acceleration. Took a tuning run to adjust my maps for the change in pipe and all looked good. Running E45 I was hitting about 70% duty cycle at 12PSI boost. So I figured I'd turn the controller up and see how it did with a little more... And discovered a new fun strangeness! At full boost I'm now only getting 13PSI! So now I have to determine if thats due to the drop in RPMs from the rollers or from more back pressure in the exhaust... And thats why you don't change two things at the same time! |
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Kaos
Scoot Enthusiast
Posts: 185
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Post by Kaos on Feb 17, 2023 0:23:06 GMT -5
So I ran it out of the neighborhood after work out a country road near my place and pulled the baffle out on the side of the road. Boom, right up to 18psi like nothing. So its the baffle restricting the turbo.
Seems I need to find a better flowing baffle, but it'll do to not annoy the neighbors for now. I also discovered it sounds about the same with or without packing material, so I'll be leaving that out for now. Easier to remove and reinstall without it anyway.
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Kaos
Scoot Enthusiast
Posts: 185
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Post by Kaos on Feb 21, 2023 14:30:49 GMT -5
Had a nice long weekend to go enjoy the scooter instead of tinkering on it, took it out to the local Cars and Coffee event where it was a big hit. Then took my RD350 out for a nice ride.... And blew the transmission on it. I think a shaft bearing let loose. I pulled the clutch cover and a single ball bearing dropped out. Bother... But thats not THIS project.
For THIS project I had a new injector come in the mail yesterday, so I put it in a few minutes ago. Went from a 377cc/min injector at 4BAR fuel pressure to 542cc/min at 5BAR pressure. Both a larger injector and more fuel pressure to increase flow. Changed my injector flow rating in my Megasquirt, and boom. Fired up and idled like a kitten. I love Megasquirt... My fuel tables appear to still be spot on, it wasn't correcting the AFR at all from what I could see running it in the garage. Unfortunately its currently lightly snowing outside right now so I'm not gonna take it for a ride.
Boosted scoots and snow doesn't seem like a good combo!
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Post by 808ministroke on Feb 23, 2023 7:28:58 GMT -5
sorry to hear bout ur rd 350, but I was born in 89 and probably won't even get the chance myself so from that perspective ur lucky still.
I really live this thread your doing everything possible to make a 4strooke scoot insane and scary fun and you seem to be doing it right aka not half-assed.
keep it up there hasn't been alit of builds lately on this site so thanks for keeping it interesting.
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Kaos
Scoot Enthusiast
Posts: 185
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Post by Kaos on Feb 23, 2023 11:09:05 GMT -5
sorry to hear bout ur rd 350, but I was born in 89 and probably won't even get the chance myself so from that perspective ur lucky still. I really live this thread your doing everything possible to make a 4strooke scoot insane and scary fun and you seem to be doing it right aka not half-assed. keep it up there hasn't been alit of builds lately on this site so thanks for keeping it interesting. You could make it happen. I was born in '82. The bike is older than I am  It happens... Its old, things break. Not the end of the world other than I was actually in the process of selling it and that was my 'farewell' ride. Better it broke on me than on a new owner though! I really felt like this one needed to be done right... I've seen other turbo scooter projects and they never really seem to get off the ground. They get it installed, they show it making a couple PSI boost, and thats the last you ever hear about it. I strongly suspect they never figure out oiling properly and kill the turbo, or they can never get it tuned right and give up. I wanted to prove that its totally doable and SHOW it! And its just stupid fun to build this thing. Even NOT riding it, I'm loving the challenge. |
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Kaos
Scoot Enthusiast
Posts: 185
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Post by Kaos on Feb 24, 2023 19:55:49 GMT -5
So I was browsing some scooter vids on Youtube this afternoon waiting for the ice to thaw so I can work on my Buddy, when I discovered a link that shows that the Yamaha NMAX 150 has a variable valve timing system. ON A SCOOTER! It looks fairly simple, and now my brain is churning on if I can retrofit it to my engine's head. Because this thing is absolutely NOT complicated enough already.... For whatever that little bit of brain dump is worth.
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sinfull
Scoot Enthusiast
Posts: 413
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Post by sinfull on Feb 24, 2023 21:24:52 GMT -5
Hmm, interesting actually, wonder if it is just a actuator that is like vtec, just goes to the higher lift lobe ??
Have to look that up, if it just a cam with different lobe profiles, and it just actuates a lock that follows the higher lobe at higher rpm ?? If it exactly like vtec then you can definitely do it
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Kaos
Scoot Enthusiast
Posts: 185
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Post by Kaos on Feb 24, 2023 21:31:53 GMT -5
Hmm, interesting actually, wonder if it is just a actuator that is like vtec, just goes to the higher lift lobe ?? Have to look that up, if it just a cam with different lobe profiles, and it just actuates a lock that follows the higher lobe at higher rpm ?? If it exactly like vtec then you can definitely do it Yep, thats exactly what it does. Its got an extra intake lobe on the cam, and a solenoid locks two rocker arms together to use the second cam lobe. Its basically exactly like VTEC. |
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It happens... Its old, things break. Not the end of the world other than I was actually in the process of selling it and that was my 'farewell' ride. Better it broke on me than on a new owner though!