S4 E9. We fix and road test the AMR500 supercharged Kubota diesel powered Honda 

This is the fun stuff. Everyone on RU-vid wants to build an LS motor. Anyone can obviously do that. These are the real mechanics. How small an engine can we stuff in this tiny car and then send it as fast as we can down the road, whilst attempting to get 78mpg and all with normal tools that normal people own! How are they not at a million subscribers yet?

As a European, I really appreciate the conversion for the rain measurement unit Jimbo!

Cutting 12 seconds off the 0-55 time with only 5 pounds of boost is incredible, I was not expecting that! Very curious to see how the projected 8psi does 👍 always the highlight of my Sunday mornings, this is as close to church and spiritual enlightenment as I get 🤣

"What are we fixing today boss?" "The bumps on that *bridge* are starting to *smooth out,* so close it down for two weeks and make it like a ramp for a bicycle!" -D.O.T. workers 😂

That 5psi put in a lot of work, more than I would have guessed! I'm really enjoying this K-swap series

The county fixed the bumps alright. Those are excellent bumps they installed

Your egt alarm at 1000°F is very conservative. Generally 1200 to 1250 is safe. Diesels like the extra air. Adding more air drops egt's and makes more power due to more complete combustion. They prefer to run lean rather than rich. This is all assuming your charge air temps are not too high, thus intercoolers. Also, diesels are typically the most fuel efficient at about 600°F egt's. For your fuel economy testing try to keep it around that range for max economy. Love what you've been doing with these little cars. It been very enjoyable to see you do these crazy little projects!

Good call preheating that pulley and washer before welding, a lot of people don’t realize how important that step can be…..and then wonder why their welds crack. 👍

PLEASE KEEP THIS CAR Ive fallen in love with it. I will pay you money to keep this thing intact. It deserves to live

It's more fun to drive a slow car at 90% than to drive a fast car at 30%. They may be going the same speed but it's definitely not the same driving experience

As a small motorcycle rider, I appreciate it when the local DOT takes a smooth road and lays patches over it. Maybe our workers consulted your bridge repair workers since I live less than 150 miles from you.

You should enter this car into the 24 hours of lemons race. There's one in Oklahoma in May. You could sell driving time to help fund other projects.

Whoever gave you that extra engine saved you a ton of work.

You make my Sunday mornings! And this cup of coffee. Thanks a bunch!

Morning nerds😂 welcome to the church of Jimbo. May we all aspire to be as great as he. Let us take 20 minutes of silence

Favorite car channel by far. ANYONE can dump half a years pay into cookie cutter builds, but this is the type of ingenuity and creativity that actually is interesting to watch. If you could just get this to normal car level of speed it would be fascinating, and if it can maintain substantial fuel economy it might just become a popular build that others would try and emulate.

Those 3D printed alignment tools are impressive. Very neat build

that 0-55 time is about what the original vw beetle did. impressive. looking forward to next weeks episode

Wide open throttle ? WOT! I don’t even have one to open….. Signed Honda Kubota

There's just this mad scientist in rural Kansas creating the most interesting vehicles and electronics known to mankind 👨‍🔬

These diesels have very high compression ratios to get the most out of them without forced induction. They tend not to get much from boost above 10psi, well they do but they tend to burn holes through the piston crowns. In Australia and Africa, the Toyota 1HZ is a legendary old lumbering NA diesel used in some small trucks and the Toyota landcruiser. People have been turbocharging them forever and usually 10PSI as a rough rule of thumb seems good. Anything much above that seems to blow the engines up unless they've had stronger pistons put in, usually with a reduced compression ratio of about 20:1 or 22:1 down from the factory 24:1. These kubota diesels are very similar with a 24:1 or 25:1 comp and the same style of fuek injection. If at all possible, now you have 2 of them I'd love to see you try and jury rig a reduced compression ratio, maybe by putting in a thicker head gasket? If you want a very cheap but even sketchier mod. Make a basic water methonal injection system. If you want to go even further you can mix a bit of nitromethane into the water methanol mix lol.

Very interesting. I supercharged a friends 602cc Citroen 2CV6 with an AMR300 sucking through an SU carb. I saw similar improvements in acceleration. Had to play around with pulley ratios and ignition timing to avoid "pinking" but got there in the end.

It might not be fast, but it looks like a perfect commuter car. It gets you from A to B and saves you money that you can put into a fast car for fun

"if it looks stupid, but it works, it ain't stupid". Nice job, waiting for the range test!

Can't wait til the next episode. From here, it seems like you're in a good position for tuning and road testing. Can't wait to see it break its time to 55 and its max speed. Also, I love this little car. I live in a city and only drive about 5 miles per day. The maximum speed limit I see is 40 MPH (and due to traffic, rarely exceed 35 actual). This little car would cart me around for an eternity on a gallon of diesel. :D

add a vv turbo off a vw after the supercharger with a manual pull cable to alter the vanes.

As an arizonan, i really appreciate you clarifying what rain is. I had forgotten.

Keep the supercharger boost level where it's at. Now add the turbo back for compound boost top end.

for an IT guy you are one hell of a mechanical engineer.

The sound on the fly by.. who would have thought that little stuporcharged diesel would sound so good! Nice work RC

I caught those "6 million dollar man" sound effects there 😂

I'm a mechanically minded man. For at least 5 decades +. And now. A mesmerised one. VERY well done!

I’m very happy to have found your channel! I love it! Don’t stop.

Fun video, Jimbo. Before you increase the boost, how about adding the intercooler? Might provide more performance than 3 more lbs of boost. Keep up the great work!

You have to appreciate the amount of thought and engineering in these projects to make them work imho

Let's hope the extra torsional load on the spaced out supercharger pulley does not cause premature bearing issues.

If I'm married to a certain boost pressure, a pulley makes sense. I rarely am and sometimes want to have different settings for different situations. For instance, I ran 17 psi on the street (which arguably made it too fast for the street and made torque steer a mother lover, but didn't blow stuff up on pump gas) and 30 psi when running race fuel on the track with my weekend racer. A diverter valve is almost as cheap and gives me options in the future without having to source and buy different pulleys in the future.

You really have considering putting one of these into my 51 jeepster always wanted a supercharged Willy's LoL

GOOD MORNING JIMBO>>>!

If the stupidcharger had a tuneable boost bypass valve, would that make it a smart charger? 😛

Next project ? You use the jacket water heat and the exhaust to make steam and use it to run a modified old impact gun to give it Water Gas Nitro effect ! WGN. Can also be done using an engine air starter used on diesels …..

you should do inbetween pulley ration, you went from 1.4:1 to 1:1, I think you should try 1.2:1 that would make aprox 8-12 psi of boost ! I love your video, keep up your great work !

Asmr..hilarious. Jimbo killing it on the Tube, every week. Thanks for letting us all pop our heads in the shop, and see what you're doing.

Okay next project once you have plenty of data , twin charger and turn the boost up until you send a rod to the moon but do everything to prevent it. Like big injectors , intercooler etc

Those are the exact results i was expecting.. when you overboost a diesel you lose power if you don't have the correct amount of fuel to run it. Soo sometimes less boost is more like ihis instance.

I think the boost with the original pully setup would have been fine. As long as there isn't to much fuel

That's a good thing that the engine got a linear power band! For real usability this is a fantastic trait

Idk if i mentioned the VGG sticker love the love. 😂 im almost at 7k subs im trying man. 😢

It’s looking like when you DO bite the bullet and remake the crank pulley to get that proper SC drive ratio, looks like you’ll be right at the target boost numbers, exh temp should be more where you’d want to see it, and the little bugger is gonna have a cool little blast from the pipes upon acceleration. Can’t wait to see what’s next 👍🏻.

Hello from Slovenia Jimbo ! ❤🇸🇮

I think you will need a longer bolt for the crank pulley to "screw it" all the way in

Stupidcharger gave a outstanding result 12sec faster in acceleration @5 psi 👍👍 a liitle more fuel consumption is minor 😊great work 👏

Your channel inspired me and I put nitrous on my lawnmower for the patches with very tall weeds.

"Cheap is small and not too steep. Best of all, cheap is cheap!" - Ray Davies 🤘😁🤘

Intercooler and a couple pounds more boost and it's there.

The dial up internet sound a few shows back was a hoot!!!!!!

An interesting thought that would be way too hard to implement would be to make the engine run Atkinson cycle by changing the cam and then upping the boost a little more. Atkinson cycle involves holding the intake valve open a little longer so that some of the charge is pushed back out of the cylinder. This lowers the peak pressure at TDC. In theory, one change would undo the other but we know that the only difference between theory and practice is that in theory there is no difference.

Dude , that is a rad differance In acceleration considering the engine, displacement , and over all packaging .. man that's sweet and I can't weight to see what more boost does .. and you are teaching me deisel rbh I'm a full petrol head and have only ever touched a 89 vw jetta deisel on any deisel engine and I think it's way different but idk ... but yeah man I have a speeduino running my whole car and it's a forged bored over miata with big turbo on 30-35psi and the big turbo is leggy so I got the speedyino ran to a monetary switch on my shifter to engage launch control and or flat foot shifting , and it makes a insane differance on flat foot when driving and keeping boost into next gear , I brake traction but I feel it would be perfect for this build .. and I know u are definitely more than smart enuf there Jimbo my friend ... anyways I lo e the content as I love tinkering myself so I bid u adue until next vid /weekend . Much love and respect to you and yours jimbo . Stay safe and have fun brotha ✌

I'm going to need you to teach me that technique at 10:45

This little thing is a completely reasonable city car, now. Amazing how much a little bit of boost can do!

First I wanted to say your work is genuinely quite good. In retrospect it may have been an easy idea just to induce a boost leak. Start with a small hole and increase it untill you got the boost you wanted. Though this is a much better solution. Knocking off 12 seconds is crazy, I wonder how much a little more boost will increase it.

I have to resubscribe to your channel every week. What is going on RU-vid?

"water falling from the sky" 😂

I kind of want to see one of these small, not really meant for vehicle propulsion diesel's twincharged now lol.

Can't you just use the turnbuckles to adjust the belt tension? First shorten the turnbuckles, then put a slightly shorter belt on, then lengthen the turnbuckles to proper tension.

Ahhhh... Looks like the development of the Honda Insight GT719-R is going well.... 😏🤣 Just need some badges making for the back 😉🤣 😎🇬🇧

Acceleration tests suggest about 35hp range at 5-ish psi. The 8-10 you're looking for should get you to the low 40's, with torque numbers resembling a N/A 1000cc gasoline engine. 0-60 numbers resembling the quarter mile times of a 1971 Beetle is more than respectable for an Engine I'm betting will still provide 70+mpg on your fuel mileage test. A driven pulley roughly the same diameter as the oem driven pulley should get you close to where you want to be. After that, an intercooler (and possibly a larger drive pulley change to compensate for the pressure/flow characteristics of the intercooler) would be the next 'safe' step for moderate power gains while still limiting the potential for engine damage. Pulleys and intercooler should allow you to match the beetle in acceleration, while maintaining fuel milage. All engines are air pumps, and diesel like being on boost more than most simply by design. Good luck.

Nice! Make it last 👍 WOT everywhere and no speeding tickets 😄

You probably got from 20hp to 27 hp with the 5 psi boost. Most of the gains will be from the torque, gained at lower rpms. I'd say you could definitely do with the old pulley. At 1.4x I'd guess the boost would go from 5psi to a solid 7-10 psi.

Pretty impressive improvement there to the acceleration, it's about right for a sub-1L diesel car really, and still plenty more to give I'm sure... :)

Twincharge it, reuse that turbo set up lol

13 seconds is what the last Chevy Cavaliers did 0-60 in (PCM locked, could not make it go faster without tuning), so that's pretty dang good.

Just got word from a buddy Japan has filed a formal protest with Foggy Bottom (State Dept) for Cultural. DE-Appropriation on behalf of Honda &Kobota !

Cheating? No sir, you're mistaken; They've misspelled "Creative" 🎉 Happy Sunday!

That's awesome! I'm so happy it works. Like I said before, turbo lag on small engines seems so bad, the supercharger might make more sense. And apparently it does! Crank that boost up :D

There was testing in the early 90s about supercharging diesel for improved efficiency and reduce soot. Theoretically, under boost, diesel engines are more efficient but turbos are always behind the fueling. Maybe with low boost there might be an MPG improvement, but at higher boost levels the parasitic lost of the amr500 might overcome the benefits. It’ll be fine to see where the balance of power and efficiency flips with different boost levels.

I could be mistaken but think that the fuel economy of a turbo charged engine is slightly better than supercharged. Logic would tell me that the parasitic load of a super charger at low RPM would be part of the equation. Does anyone KNOW much on that topic?

Child's mother: Frankencar doesn't exist. It can't hurt you. Robot cantina: Meh parts is parts.

Almost 13 seconds quicker to 55 is amazing. Now imagine testing with the original boost numbers and seeing how much better she accelerates,and if there's any top speed gains...

This is pretty awesome. I’d say that alarm likely wouldn’t have tripped if you were running that boost through an intercooler. Seems to me that the car is pretty drivable around town.

I wonder how an 800 cdi Smart engine would perform on a Honda Insight... 🤔 Smart ForTwo with that engine gets something like 60 mpg

Maybe throw the smaller stock pulley with the original belt drive. FYI tractor supply, farm and fleet or big r sell pulleys for quite cheap. Universal type where you buy the center hub separately from the pulley.

I bet if you port the head you'll gain alot. My 25hp Yanmar head had really restrictive valve seat protrusion and exhaust ports.

Actually if the chick you were trying to impress was concerned about spending money on fuel... you would

Just because the egts are lower, it doesn’t automatically means the Eta ist higher. You have to take the air mass into account. 200g/s at 650C have more water heat in them, as 100g/s at 800C.

Gale Banks built a supercharged duramax recently and I believe he said he was making like 20 psi at idle. He ended up making a type of blow off valve so that at idle the air wasn’t going into the motor.

Wow! So are you going to make the engine work harder to drive the supercharger faster? With that plan, is it going to improve top end rather than bottom end? I thought having the torque is more important than the horsepower in this situation. Sure, boost is low, but consistent. Maybe a bit more to get around 8-10 pounds of boost to keep it "in the middle"?

fuel eonomy may be the same as before but fuel efficiency should have improuve, your car exhaust is not as black as before you are using the same amount but getting more hps also running the SC should help you low temperatur issue with the engine working harder producing more heat

Imagine getting it all down and making kits for certain cars. Nobody needs 300 HP to just travel or get groceries.

i wanna see in the future what will happen if u put the stupidchager and a snail( turbo) on this engine.will it be faster then the light?( probably) wil it explode? also probably.fuure jimbo only knows.

shes coming along well. i say if youre still getting over 30 mpg its a win no matter what you lose over N/A compared to boosted. If you throw just a tiny bit more boost at it, you should be in the ballpark of where you want to be with this.

Hi Jimbo, I stopped watching vgg, and ignored a notification for Mike Finnegan to watch this, so that’s where you’re at in the rankings.

I wish I had a future Jimbo so I could bet on sports and things. We’d make millions and work on cars all day long. Ah, one can dream…

I hear Toyota is looking for a smaller engine for their fake line of trucks. When you get this thing perfected they maybe interested. They'll find a way to make it use more fuel but that's just Toyota. Can't wait for the next video. With so much going on in the world it's nice to see a story where no one is mad or hurt. Thank you

Since the crank pulley is smaller now, can you now use the original pulley on the supercharger. Its already there, so just move over the belt.

My 1991 Honda Civic 4-door, manual transmission car got 47 mpg on the highway as long as I kept it at or below 55 mph, with the tires inflated to sidewall-max PSI. And that was all-stock, no modifications. And I took very careful, manual MPG records.

It's a Diesel bro. It has ho boost limit, the only reason you limit boost is for the sake of the supercharger. More boost better EGTs, more power, smother running, the thing that you need to worry about is fuel amounts, too much fuel can tear that engine up faster than anything.

Hey Jimbo! I want more answers to questions I haven't thought of yet! Thanks!

and now bolt on that tiny turbo and compound it.. shoud easily make power everywhere, with currant fuel settings

Running a longer belt and using the tensioner to hold it onto the pulley will give you better belt wrap and make belt slip way less likely. May not be an issue, since the blower isn’t very big. Just something to consider. Good content!