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Turbo scooter?! Nawwwwww.

Old 05-27-2011, 07:02 AM
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Default Turbo scooter?! Nawwwwww.

Wait. I mean YES! Im a new member here, and this looks like a great place to get my feet wet in the DIY turbo world.

First off Im 6'1" and 255 lbs. So yes I like driving the smallest stuff possible. My DD is a 97 for aspire, and my toy is a honda ruckus. I look like a circus bear braaping across town on my scooter along side my girlfriend, and its the most fun Ive had every time i go scooting.

As for the the project at hand, its not only my first time turbocharging anything, but also my first time tuning for e85, and my first time building a drag scooter. Its actually only the 2nd scooter ill have built. My ruckus was my first scooter build and the girlfriends is mildly customized. Heres a couple pics of our current scoots.

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And this is what i have sitting for the new project.



Progress will most likely be slow on this, because Im wanting to take my time and learn as much as i can along the way. Ill have a ton of questions for you guys, so help a brother out! I dont really wanna blow this thing up!
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Old 05-27-2011, 08:05 AM
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the easiest way to turbo it is to design the kit as a draw through design instead of a blow through. this will make tuning easier. you will need to add a fuel pump and a boost referenced fuel pressure regulator to raise the pressure just over boost pressure otherwise fuel will not flow into the carb venturi.
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Old 05-27-2011, 09:25 AM
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So I'm going to need to build an electric fuel pump setup then? Good to know. I knew a draw through setup is better, but was going to run a vaccum opperated mikuni pump with a 30mm flat slide Carb, and jet accordingly. With a cvt, throttle and engine load is directly correlated with rpm and speed obviously because there is no gears to shift. So no matter what half throttle will have the same amount of load and rpm every time. As well as full throttle. Am I correct in this thought process?
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Old 05-27-2011, 01:48 PM
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yes. you will need an electric pump setup othwise your engine wont last long.
draw through setup is not better, its easier.
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Old 05-27-2011, 03:31 PM
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Thank-you for the English lesson, but as far as I'm concerned easier tuning=better since I'm new to Turbo tuning. As far as the motor not lasting long. Why not? Fuel starvation? Why wouldn't the Carb feed fuel into the veturi without an electric pump? There's still a vacuum in the veturi as long as air is being pulled through the Carb. Doesn't matter whether there's a Turbo behind the Carb or not. A Turbo just means more air being pulled through vs naturally aspirated. Please explain what wouldn't last long in the engine. Why would it fail?
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Old 05-27-2011, 08:47 PM
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yes. your correct. on a draw through design the carb would sit on top of the turbo inlet so as the turbo spins up more vacuum is created at the venturi drawing in more fuel. boosted engines require more fuel than n/a engines so jetting will still have to take place.

on a blow through design you will need a fuel pump as the carb gets boost applied to it. sorry should have clarified that. it is now no longer relevant as you are positive you are going with a draw through design anyway.

this should be a quick build as the only thing you will need to do is make the exhaust going to the turbo, find out a method of fastening the carb to the turbo air inlet, running a boost pipe to the intake runner, jet the carb, run an oil feed and oil drain to the turbo. you may have to use an oil supply/scavenge pump and a resevoir to make this happen.
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Old 05-28-2011, 12:40 AM
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If all goes according to plan I should have the Turbo by next week. As for the motor. Not till fall, because I need to save first. The motor ill he using started as a 150cc gy6 scooter motor. But my motor will be tapped with oil bungs. One into the high pressure side and one into the low side for drainage for the Turbo. It will be a full race built 226cc stroker motor. Built with a hardened chromoly race crank/connecting rod combo, forged/ceramic coated piston, ceramic sleeved race cylinder, large port, ported and polished head, stainless flat bottom valves, titanium double valve springs and keepers, taida t100 race cam, and fully adjustable cdi box. So it will take me a bit to save for this setup, but it will happen. Besides. I have a ton of work ahead of me before I get to the point of final motor assembly.

I am very proficient in NA tuning motors. And have built.anything form big block Chevy's, to a 900cc arcticat thundercat. So I do have a good technical knowledge base to work off of. Even with my stock 150 in my ruckus, with a port and Polish job done to the head by me, a9 cam, and 30mm slide Carb. I was able to walk a 180cc big bore gy6. So I am also no stranger to tuning these motors either. Just to give you a little history on me.

Now a question I've been contemplating.
How do you think a single cylinder motor will spool a Turbo? I've been wondering how the exhaust pulses from only one cylinder will affect boost. I'm assuming the boost may just fluctuate 1-2 psi, instead of staying steady like on a multi cylinder motor.

There is a small pocket of others who have attempted what I'm wanting to do, but none on a motor built to the extent I'm going to and none with the attention to detail I'm prepared to give it. I've attempted to contact some of these people with no success.

Last edited by mr.potatohead; 05-28-2011 at 01:00 AM.
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Old 05-30-2011, 03:28 PM
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have you calculated your airflow and plotted it on a compressor map? a single cylinder will be fine assuming you can find a turbo small enough. your going to need a very very small turbo to pull this off. i assume that engine redlines at 15,000-18,000 rpm but with the big bore kit it may lose some of that high rpm. garrett has a gt12 turbo but i think it may still be too small for your application. not sure what other turbo's are out there that are smaller than that.
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Old 05-30-2011, 07:42 PM
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Stock the motors power band peaks at about 7500rpm. The motor I'm building will peak at about 10,000rpm. As for the Turbo. I know that will be my biggest hurdle. I'm just gonna find the smallest Turbo out there and hope for the best. The few others out there that are turbocharged are stock 150-180cc with a Turbo comparable to a gt12. They are getting around 10psi depending on tune, and how capable the builder is at not cobbling. And at that they don't run very well. Mainly because of the cobbling factor. And from you can see in the above pics, I don't cobble. So only time will tell how well it works.
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Old 05-31-2011, 09:03 AM
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cobbling?
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