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turbo scoot
by: bobby17772 - Apr 11, 2014 22:52:21 GMT -5
Post by bobby17772 on Apr 11, 2014 22:52:21 GMT -5
hey guys, this isn't a regular question, but I just turbo charged my scooter, I have it about  % done (just small things I need to finish visually) and I'm having a little bit of a problem. It was running really lean, I put the washer on the needle jet all the way to rich, and that cleared up a little bit of my problem, it'll rev pretty high but when I get to about 3/4 to WOT it'll pretty much shut itself off. I'm pretty sure it's the main jet being to small (not sure what size it is). Do you think what I'm thinking is right? I'm assuming it's getting to much air and it can't pump enough fuel to stop it from dying. It idles great, revs great from idle to 5k or so then just bogs to the point of trying to die, all of my intake piping is air tight so I don't think it's an air leak especially seeing how well it idles and revs. a little about the build, it's a 50mm big bore, a9 cam, performance variator, weights, and clutch, k03 turbo from a 1.8t jetta...any other questions I'll be more then happy to answer. thank you |
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turbo scoot
by: alleyoop - Apr 11, 2014 23:02:21 GMT -5
Post by alleyoop on Apr 11, 2014 23:02:21 GMT -5
COOL!! put up some pictures of the TURBO job, they are hard to adjust and it if its pumping a lot of air in yes it most likely is starving for fuel.
Alleyoop
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turbo scoot
by: skuttadawg - Apr 11, 2014 23:59:07 GMT -5
Post by skuttadawg on Apr 11, 2014 23:59:07 GMT -5
What size carb and jets ? Yes more air means you need more fuel . How many PSI of boost does it build up to ? Do yours have the oil cooled bearings ? May need and electric auxiliary oil pump if so . With a BBK compression is higher and may be too much to turbo as cars with a turbo often have compression ratio of 8 to 1 . Performance cars often are 10 to 1 and up to 12.5 to 1 . You may want to get a spacer on the bottom of the cylinder which would be better than using an extra gasket . I talked to my dealer who is master guru on scoots and he built a 188 GY6 with 63mm bore and a stroker crank . He said the compression was 230 PSI . He told me there is more variants of the Gy6 than I though as his has a thicker block and did not need to be bored . I would check out the head from Scrappy that is ported and larger valves here on the top of the page headI would love to see where the turbo is and I am pretty sure you had to make a custom exhaust . Does it have a blowoff valve ? You may want to get an EFI kit like this one made for a small turboed engine here EFI kitThe boost may harm the piston and crank bearings . On Brents site I saw a thread where a guy wants to use a Honda XR 80 piston from Wiseco since it is machined out of billet and forged twice instead of cast like most are . Wiseco They cost way more but made in America and worth the extra . I will look it up and see if he got it to work . I used a Wiseco piston in my Honda CR125 and I was impressed how much better it was than the Honda piston . Here is the wildest scooter I have with a turbo , nitrous , wicked paint job along with Alpine radio and tv . I think the turbo setup is mostly for looks as the video only has it idling and revved up but not riding |
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turbo scoot
by: bobby17772 - Apr 13, 2014 13:22:17 GMT -5
Post by bobby17772 on Apr 13, 2014 13:22:17 GMT -5
I'm not sure how much boost it would make because I haven't had a chance to ride it because of the whole starving for fuel thing, but I remember I half way put it on a different scoot because I rebuilt the turbo and it made like 5psi, but it was only for like a second because I didn't want to run it without oil for to long. I'm hoping that leaving it higher compression will actually help me because it'll have more power outside of boost so that means it'll have more power to create boost (I hope) so I'm going to see just what happens. I've had/have a few turbo cars and yeah they do have low compression, but that's just so they can either use more boost or run without an intercooler, like my  nissan 300zx for example, it has 7.7:1 I believe maybe a little lower and they did that so they could run 7psi from factory so it would be like running 12:1 effective compression at full boost. if I see that it does make boost I plan on going efi but if it doesn't there's almost no point in this build. It's kind of funny we have a running joke at where I work because I call this on the mk3 because I had an older jonway that I put a t25 off of a tallon on and it make 2psi way past any usable rev range (mk1), then I used the same exhaust welded a flange that I made for this turbo on and tried...then I could never get the jonway to stay running (even without the turbo on) (mk2), then I made a new exhaust and put the small turbo on there and that's where I am now (mk3) but I plan on making another new exhaust because as you see from the picture it sits so close to the wheel and tire that I don't want it to backfire and melt a tire lol.      |
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Post by spandi on Apr 13, 2014 13:34:03 GMT -5
I'm not sure how much boost it would make because I haven't had a chance to ride it because of the whole starving for fuel thing, but I remember I half way put it on a different scoot because I rebuilt the turbo and it made like 5psi, but it was only for like a second because I didn't want to run it without oil for to long. I'm hoping that leaving it higher compression will actually help me because it'll have more power outside of boost so that means it'll have more power to create boost (I hope) so I'm going to see just what happens. I've had/have a few turbo cars and yeah they do have low compression, but that's just so they can either use more boost or run without an intercooler, like my nissan 300zx for example, it has 7.7:1 I believe maybe a little lower and they did that so they could run 7psi from factory so it would be like running 12:1 effective compression at full boost. if I see that it does make boost I plan on going efi but if it doesn't there's almost no point in this build. It's kind of funny we have a running joke at where I work because I call this on the mk3 because I had an older jonway that I put a t25 off of a tallon on and it make 2psi way past any usable rev range (mk1), then I used the same exhaust welded a flange that I made for this turbo on and tried...then I could never get the jonway to stay running (even without the turbo on) (mk2), then I made a new exhaust and put the small turbo on there and that's where I am now (mk3) but I plan on making another new exhaust because as you see from the picture it sits so close to the wheel and tire that I don't want it to backfire and melt a tire lol. I remember that thing it had the "Predator" paint job. |
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turbo scoot
by: bobby17772 - Apr 13, 2014 19:25:39 GMT -5
Post by bobby17772 on Apr 13, 2014 19:25:39 GMT -5
alright small update, I changed out the main jet...I COULDN'T BELIEVE IT WAS ONLY AN !! I changed it out to a 105 it's now rideable...kind of, it still bogs at WOT but not as bad I can still ride it. I need to reroute the oil return line because it's just blowing out the back of the turbo because it's not recirculat properly and it was smoking worse then a 2 stroke |
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turbo scoot
by: PCBGY6 - Apr 13, 2014 20:06:01 GMT -5
via mobile
Post by PCBGY6 on Apr 13, 2014 20:06:01 GMT -5
Nice work. Would love to see a video of it running And on a ride when you have it completed and dialed in.
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turbo scoot
by: JerryScript - Apr 13, 2014 20:17:30 GMT -5
Post by JerryScript on Apr 13, 2014 20:17:30 GMT -5
Wow!  |
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turbo scoot
by: bobby17772 - Apr 13, 2014 22:02:53 GMT -5
via mobile
Post by bobby17772 on Apr 13, 2014 22:02:53 GMT -5
Hey weird question but just for a cleaner looking install I saw those ncy oil cooler plug adaptors that they don't sell separately what are the odds of just tapping the drain plug and just put a fitting on there and using that as a supply?
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turbo scoot
by: boostcrzy - May 5, 2014 22:17:24 GMT -5
Post by boostcrzy on May 5, 2014 22:17:24 GMT -5
The problem here would probably be the fact that you are running the Carb in a "blow-through" configuration....be sure the float bowl vent is getting boost.....and you will need to run a fuel pump to ensure there is no backflow of the fuel system.
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% done (just small things I need to finish visually) and I'm having a little bit of a problem. It was running really lean, I put the washer on the needle jet all the way to rich, and that cleared up a little bit of my problem, it'll rev pretty high but when I get to about 3/4 to WOT it'll pretty much shut itself off. I'm pretty sure it's the main jet being to small (not sure what size it is).
..BAD TO THE BONE..
nissan 300zx for example, it has 7.7:1 I believe maybe a little lower and they did that so they could run 7psi from factory so it would be like running 12:1 effective compression at full boost.
Main Jet
