Episode 27. We road test the Speeduino NO2C EFI on our 420 cc street legal go kart. 

Out in the badlands put your windows up over 50mph, I bet you'll squeeze out an extra 2-5mph just cutting down the drag.

No wonder the fuel tank mounts kept breaking. Shakes like an earthquake from all that horsepower.

These are the type of inspiring videos that need to be taught in Automotive/Engineering/Metals classes.

Having used an Arduino mega in some initial prototypes , interference causing the Arduino to hang was a persistent issue unless it was fully enclosed in a metal housing and any external connections used shielded cables. Being anywhere near a VFD for an induction motor meant issues were certain, for example. Great video thanks.

Imagine it's saturday afternoon and you're in your kitchen making lunch when all of a sudden you get an alert for robot cantina. Hard to imagine anything better actually...

"Anyway, that's enough tech for now" HERESY

My mom’s ‘68 Karmann Ghia did zero to 60 in 30 seconds so your cement-mixer-motor gocart is doing pretty well!

Reminds me of the old Dutch DAF cars which had a CVT going to each rear wheel separately, no gearbox.

I can't wait till we get that 670 in the machine! ITS GONNA BE EPIC!

Possibly do a 0-30 with 1st 2nd 3rd shift? Just to show the fans lol

Knowing how well he does with these small gas engines, makes me want to swap a 20hp electric motor in my 84 Ford escort.

Us Men are Crazy! Most of us have 300+ horsepower cars yet we are obsessed with this little 15hp Honda with a cement mixer engine! I Love it!

I happen to have fresh coffee and about 30 minutes to spare. You're about to entertain me. Thanks!!

For your speedometer, get a bicycle one! They sell them for like $12 at Walmart. You attach the magnet to the inside of the wheel, attach the sensor in the wheel well close enough for it to read it, enter the tire diameter in the computer and you get a speed that gets updated every revolution, instead of a choppy GPS signal!

14:20 - As an outsider your skill and calmness is... well, really it's watching a craftsman do his art. That being said it's crazy to think how hard we are on car manufacturers, they might have a few problems here and there but say even your old 1993 Chevrolet pickup rarely has issues except for wear items. A testament to how many engineers slave on these things to have a good end product.

SUPERCHARGERS!!! Cant wait for the episode of replacing the supercharger pulleys.

Yes lets goooo an new amazing video!!!!!!

I can hear Eric O shouting - "It's got the big 420!"

How this channel ONLY has 66K subscribers is beyond me. I love this!!

This has to be my favorite series on RU-vid. As someone who claims to be a mechanic, watching these videos has been very humbling and I feel like I'm learning a lot from it! Can't wait for the next video

The Arduino layout is notoriously prone to emi and transients. And a spark plug is noisy emi event. I'd put ferrites and shielding on everything, and maybe look into getting an industrial hardened version. Also maybe a resistor plug to limit noise.

Supercharger boost formula is pretty simple. It’s the ((air the supercharger makes in 1 rotation / the engine air) * 14.7)-14.7. The air that the sc makes in 1 rotation is it’s capacity * pulley ratio. You can make an excel sheet with different pulley ratios to see what the sc will make.

As soon as the tuning is done I recommend going to as many local car meets or shows as you can. You won't get any head turners over it's looks but people's minds are going to blow when they see what's exactly is under the hood.

Absolutely worth getting out of bed for! Thanks.

Its amazing what one man can do with one honda and one piston...

Would be cool to travel around the country with that car to really test its reliability. I would love to watch a video where its just you driving the car for an hour straight. Keep up the good work!

Someone watching this got to 02:00 & is now shouting, "Look! That's my old lappy! I knew I should've asked for more! Mind you, at least it's doing something more than tick-tock."

Oh my god he said supercharger and now I seriously cannot wait every 2 weeks+ for updates. I hope your setup can run 7-9 PSI continuous to push that HP into the 20s! Cus I'm fairly certain that mathematically you're going to need it for sustained highway speeds without RPM/hours related wear issues.

I love the series, really look forward to new episodes. I dont mean to sound like a broken record, but the cvt is not efficiently giving you power on 3rd gear take-off. Its designed to handle something like the ratio of 2nd gear at most, with that much weight. That is why it undershifts (overrevs,) then overshifts (underrevs.) A bigger torque converter with a bigger diameter secondary could help greatly. Or just a standard or centrifugal clutch, with proper gearing. Sorry for the long winded reply, thanks for the great content!

That thing gunna run like butter after a table clean up

IT'S very nice that you place this km/ltr. meaning kilometers per liter in your video for us metric guys BUT we're using Liters per 100km please consider that in upcoming videos...

next up, reuse the factory fuel tank instead of the little tiny one, range goes wild.

Thanks for including Metric conversions, but for fuel consumption, most countries use L/100 km. 45 US MPG = 5.23 L/100 km. Another great video, thanks!

Thanks for slipping the Nome back in. Great video can't wait to see how the turbo performs!

This reminded me I left my riding lawnmower outside to cool off. Need to bring into the garage. Thanks

16:18 That's really really really nice to include real units for the metric folks! Most people would want to read 5.3l/100km, though :-) (Which is the more logical way of displaying a fuel consumption IMHO: you need to cover a set distance and want to know how much fuel you'll need. Very rarely do you leave your house saying "I want to use two gallons, I wonder how far I'll go")

Gotta admit that your video editing skills are really getting good. Good job on your video, not to mention the progress on the vehicle.

I have serious respect for your engineering mostly because of this little detail that you are utilizing the OEM transmission which so many people tend to not and I don't understand why it's just another gearbox to change more gear ratios to help you get the vehicle from point A to point B. And when you're utilizing such a small displacement single-cylinder engine any help you can get is very valuable

As always another great video, always a great watch

You'll need to do proper gnd shielding for Arduino to prevent it from being interrupted by ignition system electro magnetic fields, and HV spikes. This is common thing on these. Just connect shield to negative terminal, and move whole thing as far as possible from coil, charging system etc.

What a treat. Coffee is made and wife brought me biscuits. Happy me.

I love these videos man. Keep up the great work, love the progress and all of the knowledge shared.

Man Jimbo, your content just warms my cockles! You do a great job all around, I am glad you're doing what you're doing! The "throwback to the episode" pan across the workbench is such a nice touch! Thank you so much for sharing with us!

Cant wait for the road trip across america

Your videos are very enjoyable... Keep up the good work!

You got the attention of the guys over at Jalopnik, so I'm looking forward to seeing their comments. lol

This has got to be one of the coolest engine builds on RU-vid.

"I do recommend watching previous episodes if you need to get up to speed" nyuk nyuk nyuk

this is the best series for any motor enthusiasts what a great content dude

based on my personal experience from MAP based tuning, I recommend you try hitting some partial throttle points (88 and 80 kpa). That will help stabilize your AFRs during WOT pulls so you get more consistent and smoother acceleration. Drops in atmospheric conditions will have your AFRs all over the place.

Shes getting quick , I remember a time not long ago it struggled to hit 40 mph

Because of you I am putting the same speeduino on my predator 212

Could add a small alternator as well as the supercharger

love this series of videos! Make sure you increase the gap on your rings!!!! when you ad boost, it makes more heat and pressure in the cylinder. When this happens the ring gap goes away, rings expand, buckle and break the piston. I have seen this happen,.. very not pretty!!! Best of luck!

Good progress. I suppose some power input shielding on the Arduino, some opto isolation on inputs and outputs, and perhaps some RF shielding on the PCB would preclude future corruption. Not exactly industrial grade electronics there, but easy enough to rectify the obvious weak points. Cable routing matters too. CANBUS uses differential signaling for a reason.

You could solder or braze a box from copper sheatmetal for the arduino. Put ground on it and isolate everything else from the case. That should do. A few low esr caps behind a big diode on the 5V input for decoupling might help further.

A couple things I haven't seen you try yet. AC racing plug, hotter coil, billet flywheel (for higher rpm, stronger magnets, and safer at rpm above 3500). There is flywheel keys in different degrees of advance too. All these are ideas for more HP and MPG.

great project, I'm really enjoying watching your progress.

Just an idea for the cvt. A stiffer spring can help kill that high end dip in power to come in a little bit later, and the guides on the rear pulley will help dictate how much of a drop in rpm can occur when the cvt is upshifting. A smoother angle can also help control the drop in rpms so you don't stay out the engines peak range.

I feel confident that we are experiencing a level if rapid development far superior to Puegot and Fiat engineers. Right behind passing Hyundai; I estimate arrival at the Bonneville salt flats soon. Maybe there was some breaks and noise in the tps wave...wanted to zoom the raster display as fast as possible and had to stop myself from teaching through the screen. OCD&BP. Start with the drive and driven from a known install of course.

awesome

Time travel stuff... nice touch :)

Great videos, good production, thanks.

I've been driving you crazy about the nitrous oxide since you started it and you finally did it for me thank you!!👍👍👍👍👍😊😘

Thank you for the great work!!

This will be awesome to see! I can't wait to see the performance improvement!

No garden gnomes were physically harmed in the making of this video.

I really want to do a project like this, it’s so cool and creative

Now is the time on Sprockets when we dance! Mike Myers SNL

For a go kart cvt it actually does a good job of keeping the rpm right around 3600 which most small engines peak at.

Should go order yourself an old lenovo t420 off ebay. I use them for tuning microsquirt ecus and they work great. No issues what so ever getting the COM ports to work with the usb to serial adapters either. Love the content man, cant wait to see what this does when you get that AMR supercharger on it!

You are doing quite well, definitely on par with my Mitsubishi 2 cyl. 550cc micro van.

Yay a new episode

I love your edits.

I laughed when Dieter showed up in the section about the Sprockets 😅

Great episode. Seems like all you have left to do is make it faster.

I'm excited to see more! This content is great!

Speeduino is going to be how I keep my car going when the ECU fails. But actually thinking about "upgrading" now since it already has issues.

I've got a built 460cc stroker with billet everything, it's originally was a 420cc engine. I would absolutely love to do an EFI setup.

Good fun seeing what the 420 will do! Hyabusa just came to mind for another engine swap😉.

Man you'll be on the interstate before you know it!! Love the vid and I managed to get it all in before I have to leave for work! 😎

(Volume per Rev of SC)* flywheel rpm: Volume per engine rev * FW rpm 1:1=1Bar You need a SC effeciency graph to dial it in.

The fact that a power washer engine is pushing a car is just still unbelievable to me

Thank you

Really some of the best content on the platform

Also now that you have TS going, you can get virtual dyno to give you a comparison tool for tune changes.

Turbo the damn thing all ready.

Damn. This is such a good build. I am literally down to see any way you take this. It seems like supercharging is coming next, but if you wanna tweak that fuel map and change sprockets I am all for it. Weight reduction would be cool too. I have yet to see anyone measure the exact weight they took off of a car vs performance gain. Whatever man just keep them coming!!!

Here's hoping he does a super-turbo setup!

I live to watch this project my favorite vids on RU-vid!!!!

Oh and here is a CRAZY idea: put a CVT between the engine and the supercharger for a self balancing ratio

I have an idea. Often on performance videos there are idiots who get all worked up about ram air setups and how it will make 80 HP or whatever. On an engine that consumes all the air it is not much change but if you had a great big scoop... say across the whole front of the grill (i am thinking a big rubbermaid container with a hole cut into it to funnel it to the air intake). If you want to check it before committing much a pressure/vacuum gauge with the hose in the rubbermaid (with no holes) just to see how much pressure is possible at max speed without consuming any air. I think the magic of your experiment is the small displacement might make the dumbest internet or pre-internet power ideas plausible. I like the idea of those fake electric superchargers or the leafblower idea (maybe modify it so it doesnt "stall" under pressure but instead lets the leafblower motor stall). Perhaps even running it on RC car 15% or 30% nitromethane? Or pure methanol. Or Avgas. Or liquid propane. Or hydrogen. Or gasified wood... or gasified keurig cups (which are hilariously called recyclable). Or run on acetylene. Or misting waste oil into it. Maybe even of those atmosphere replacement air superchargers. Perhaps the next transplant idea could be a tiny diesel. If you do some googling of chinese "trikes". They use a diesel hit and miss engine on these ubiquitous farm wagons. With a diesel you could burn almost anything. The speeduino should be able to handle the control just with some creative circuitry to control an injector... maybe just run it by feeding into the intake? In non turbo configuration that should work.

Glad to see more progress on this project. I am looking at that Predator 420cc and seeing it used in this application I think I might be a bit scared. The flywheels and connection rods of the Predator engines have a bit of a history of not working so well outside of their stock engine performance (A polite way of saying they have a history of breaking when used under more performance. That more performance is a re-jet, heavier valve springs, and governor removal). I am not 100% sure if you have done this but I do hope you have upgraded the flywheel and connection rod of the engine. I have a copy of a dyno chart where someone changed the valve springs, re jetted the carb, changed the flywheel, changed the connection rod, and removed the governor. Peak Torque: 35.81 @ 2500 RPM. Peak horsepower: 20.50 @ 2350 RPM. Max RPM around 5500. The Flywheel and connection rod were changed because it was an improvement for engine survive-ability. At this point you might want to look into a new cam for the engine. If you are satisfied with the current performance curve of the engine (heavily leaning towards Torque) I say keep with what you got but if you want an engine with more mid or high RPM performance a new Cam might be necessary.

You should use that shaft that hooks up to the front for AC compressor and alternator and power steering I think that shit would be sweet at least looking to it I love your videos

Looks like you've bled for the Honda... but you know what they say, hemoglobin is the dielectric of nature!

Moving along, so to speak.

HEY! THAT'S MY LAPTOP! MY Dell Latitude E6430 laptop with a 4th gen intel i5 2.60GHz with dual 8gb DDR3 ram cards. same one I'm actually watching this on!

The Arudino crashing is likely EMI from the ignition, etc. Shielding (= metal housing), ferrite cores on I/O cables and some filtering on the incoming power should fix that.

That dog tail is dangerous. I don't think any isolation mounts will suppress the shaking during that long final pan shot.

I would make the supacharger spin at 70% of its rated speed at max engine rpm. But a small turbo would definitely rob less power.