We did what the people wanted to see, we turbo’d the Rotary-powered ATV! We used a draw through setup with a 34mm Mikuni from GoPowerSports, and a VZ21 small turbo. The end results speak for itself, the turbo made a big difference! Next up we need to make this thing look good cosmetically and then take it for a proper on and off-road test.
Thanks for watching and stay tuned for the next video!
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34MM MIKUNI – https://www.gopowersports.com/34mm-mikuni-carburetor/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Oil Reservoir - https://www.gopowersports.com/aluminum-catch-tank/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
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780 series driven pulley - https://www.gopowersports.com/780-driven-pulley-3-4-bore-aftermarket/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
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SWAG Offroad PortaBand Table
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In the last episode you saw us get the rotary atv popping wheelies, ripping and just generally dialed in so now that it's dialed we got to make some mo power baby. Oh pow, baby amen. What we have to do, that is some parts from go power sports as well from amazon. What we got here is some header pipe carb jets oil reservoir for our turbo oiling system, some flanges.

We have a 34 millimeter mikuni, also from gopowersports. We have our fuel transfer pump that is going to serve as our oil pump and our little baby vz21 turbo and we're going to have links for all this stuff in the description. Some of them are affiliate, links for amazon and the other ones are go. Powersports links, so if you order stuff, it helps us out very much appreciate it.

We have the rotary warming up in the background. So what we want to do is just a couple little bass lines, so we can really see how much more power this turbo makes. So basically, our test is just seeing how fast we can get to in this little stretch here very scientific, here's, our vz21 turbo. So these things are pretty small but they're good to up to 100 horsepower and 600 700 cc's.

So there should be no problem running our rotary, that is 295 cc's. These are 150 bucks on amazon, so they're really cheap and you can get them. You know within a week - and we already did a little bit of work to this thing, so we clocked the turbo, which basically means just turning the turbine and the compressor wheels a little bit just to fit our needs better. Because of that, we had to get rid of our wastegate, but that should be okay, since this is kind of a small turbo.

We're hoping it'll just be fine and we just don't over rev the rotary and we should be okay. We kind of ported the exhaust inlet since we're going from a 1.5 inch exhaust down to this 25 millimeter opening. We wanted to kind of have a smoother transition. So what we did is took this one inch to three quarter inch pipe coupling.

Then i lathed it out to 1.5 inches and one inch - and this will give us a pretty smooth transition down into our turbo and we shouldn't lose too much power from that now we're going to weld the wastegate closed, we got our turbo mounted up. This is where it's going to live. We have it tilted a little bit back and it's pretty mounted pretty high up, so we're not hitting our feet so now we just got to start getting all these pipes hooked up. Okay, there's! So here's a little equipment update huge thanks to hobart.

We got the multi-handler 200. This thing can do mig run an aluminum, spool gun, stick and tig weld. So it's everything we'll ever need, and it's just a bit of an upgrade over our smaller hobart handler 140.. That thing's worked great.

It still works awesome, it's we've had it for over five years, but it's time for just a little upgrade. This thing's really tunable doing the exhaust. It's really nice and we'll have a separate video on it. On the channel.

Okay, we got our charge pipe and the moment of truth. Will it fit? Oh nice? Okay, so some of y'all may be wondering why we're using one inch pipe right here or tube uh. That's just because the turbo outlet is just very small and um. We also our bender does not do 1.5 inch tube, which is why all of our exhaust is kind of stitched together and all weird looking, but i mean that looks good.
I'm really happy with how that looks that looks great. The oil on the turbo is not pipe thread, it's m8 by 1.25, so we ended up using our mini lathe drilled, a hole down the center, and now we can put a inlet on there and weld that up now that everything's welded up, we cleaned out the Intake exhaust on the rotary completely took about the turbo and rebuilt that so everything's, nice and clean and we're just gon na assemble it and see how this thing rips. Now for the exhaust outlet, here's the oil setup for our turbo. We have this oil transfer pump.

You can get these pretty cheap on amazon, we'll have a link for what we use. These are kind of for changing the oil in your car. So we have our high pressure line going up to the inlet on our turbo. Then we have the drain from the turbo going down back into our reservoir.

We then have this little kind of breather cap and fill cap. So right now we'll just fill this up with oil cycle. The pump get some oil in these bearings because these are they're. Actually, bushings not bearings, so we want to make sure they have oil before we start spinning up this turbo okay time to prime the pump a little bit see if this pump even works.

Okay, lots of air bubbles in there, but should be fine. Oh, no just got oil all over me. Man. Well, here goes round two.

We put a much thicker hose on here, we're using what they gave us in the box. So i don't know why it exploded like that, but you should have a wider angle in case it happens again and fingers crossed. Oh man, okay, much better, we ran out of our reservoir. Oil got our mikuni 34 millimeter carburetor ready to go on is the final touch.

Unfortunately, it's not for aircraft use, so we cannot use this when we rotary swap a boeing 747, but for the rotary, atv it'll work perfect so slide that on and let's see how this thing does now, that's all buttoned up. So it's ready. I guess we have a pretty rich jet in there, the richest one we have um and then we're just gon na sort of go down from there. Hopefully, so i guess we're just gon na prime it and see what happens.

Hopefully it just starts up as it is what all right dude does it start better than with no turbo no way here we go kind of oh wait. So, basically, if we leave the oil pump running the pressure, just kind of blows through the seals, but if everything's turning and running, then we're good, so dude no way no way that first rent, i randomly just picked a main jet and just threw it in there And it's it's running pretty good. It gives smoke when you give it some throttle and stuff like. I don't think, there's too much reason to be worried about it.
It's not as snappy. So i'm not sure if the wheelies are going to be gone, but i guess there's one thing to do and that's test driving so well. It definitely has more power. I mean i don't know if y'all could tell, but it definitely has more power.

If you kind of ease into the throttle, you can feel it build boost and just keep going um. One issue is, it's definitely less drivable. We do still need to try and tune. You know the air, the idle air pilot jet all that stuff needle jet, but yeah more power and off dude.

It starts without starter, fluid, which we never were able to get it to start without starter fluid on the old one. So this is pretty awesome. I'm really happy with it definitely have more tuning to do, but it's a great start. Okay, that looks really fast.

So i don't know about y'all and i don't know how it picks up on camera, but i think that looked a lot faster. Let's see the times. What do you think you hit last time? It was 40. yeah.

I think i mean we didn't have the runway is kind of small, but i think 55. First one was 41. okay. So that's better! That's an improvement.

Oh this one was 45. 46.. Okay, that's pretty good for that short distance. 47.! Oh getting close up okay, so this is the last run.

Okay yeah, that was that felt like my fastest run, so we topped out at 47, but that is in the same. You know distance yeah, that's so pretty impressive! Honestly, i mean seven miles an hour faster in the same runway. Also, it's it's running like you can't floor it. It gets too rich when you floor it, so you kind of have to modulate the throttle a little bit.

So if we get that main jet dialed back a tiny bit, we'd probably be a little faster. Since i don't have to keep like adjusting the throttle yeah, we need to throw a boost gauge on it, see how much boost we're making oh dude dude. We we have a boost port but we don't say heck sorry, so we have the boost port ready and we have the like flange coming out, but there's nothing there. So we're just leaking boost out of that area.

So we have a giant boost hole. So we'll fix that and see what's up well did a couple of runs with the boost gauge, and this thing is way out of whack the needle's just bouncing around in there. But then it kind of like, as you go faster kind of levels out and it goes from negative 20 and stays pinned at zero. So i don't know if that means 20 pounds or zero pounds or what but we're definitely, i would say, inconclusive results from the booths jerry's still out.

I think we need to get it. There is some sort of boost yeah there's something going on. So i think we need to get another boost gauge though it's still wheelies guys, uh, that's pretty awesome. So previously we had trouble keeping the wheelies up because it would just grab and flip it up really fast, but the turbo is a little bit more progressive.
So, as you all saw in that last wheel, it was better than the other ones. I've been doing so that's awesome. I was kind of afraid. We'd lose that with the turbo.

The next thing is we're waiting on carb just to be shipped in. We think it might be running a little lean because when you go full throttle it cuts out, and we just don't want to push the engine too hard. If we're going to be running it a little bit lean other than that. You know this is a pretty good success.

We have a little bit of wiring to do maybe trying to get the battery to charge from our coil, but i'm really happy with this thing. It definitely makes more power still does wheelies looks cooler, it's just all around great. So that's the end of this video. Thank you.

Go powersports all of the drivetrain components and the mikuni carb that we used on this, which is really tunable, are from gopowersports, and thank you all for subscribing and watching and we'll see you in the next video you.

Avatar photo

By YTB

12 thoughts on “We turbocharged our rotary-swapped atv! rotary atv ep.6”
  1. Avataaar/Circle Created with python_avatars robot797 says:

    quick question what jet sizes did you use bevore the turbo

  2. Avataaar/Circle Created with python_avatars MaNNeRz Laguna says:

    40mph doesn't seem like a good baseline for that much capacity. Gear it slightly lower maybe? My 125cc does 65 70 at a push 👀

  3. Avataaar/Circle Created with python_avatars Craig Krage says:

    Use the brake to regulate your wheelie. Steady throttle control and use the brake. For God Sakes Put Heel Guards On It.
    🙂

  4. Avataaar/Circle Created with python_avatars Josh VanDruff says:

    Everything is better with a turbo. Keep it up! 🤘🏻

  5. Avataaar/Circle Created with python_avatars DAT Blue Husky says:

    i would recommend using a bigger tube for intake manifold to give it little bit of air space to help with the pulses, and yeah you need to tune that carb alot as well

  6. Avataaar/Circle Created with python_avatars John Congo says:

    I wonder if peak power is still the same rpm, would the cvt pucks need any tuning?

  7. Avataaar/Circle Created with python_avatars LuxGamer16 says:

    If you dont want the boost needle to jump so much, add a brass tube inline and crimp it to the moment the needle stops jumping as much. Saw a video where a guy turboed a hecking welder of all things. That worked for him.

  8. Avataaar/Circle Created with python_avatars Ravi says:

    Dammn that is sick I want to build mine too soon. I love rotary engines

  9. Avataaar/Circle Created with python_avatars zxggwrt says:

    Awesome I love small turbos on small engines. It always makes for interesting problems.

  10. Avataaar/Circle Created with python_avatars The Tech Hobbists says:

    You should add a Cold Air Intake system!

  11. Avataaar/Circle Created with python_avatars Noor ul huda Khan says:

    👍

  12. Avataaar/Circle Created with python_avatars Andrew Johnson says:

    How could it get cooler

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