Engine Control Unit (ECU) using dsPIC33F

#2
sounds interesting... i was looking to do something like that .. but then the more i thought about it... all i could adjust would be the spark and the timing via the coil.. since there is a carb and no f.i. there is no injector pulse to modify.... guess you could weld a bung and use some type of o2 sensor.. to get better readings...im open to try something like this.. but just dont see the advantage in it....wish i could find a mini turbo... that would be sweet!!! :scooter: use a small i/c and then i can see the usage in a ecu.
 
#4
Nice ECU BTW. That's a headache and rather complicated I know, so my hats off to you sir! What motor is that, and did you make an new harness for it or just splice the old one?

Cooling System Oil & Water Cooled
Wastegated Housing internal
Actuator Compete Yes
Other Specifications Smallest Garrett® turbocharger available Excellent for motorcycles or other small displacement engines


Horsepower : 50 - 130
Displacement : 0.40L - 1.20L

Still seems too big for the num these lil motors push. Peaked my curosity so gave google a run.
MOTORCYCLE QUAD RHINO Turbo BIKE SEADOO Small IHI RHB31 | eBay

IHI RHB31 is on other sites as 500cc to 660cc.... but auction says 190cc to 900cc? Low numb is what I care about.

This guy put one on on diesel. http://www.youtube.com/watch?v=F49NTjbfIOA&feature=related
 
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65ShelbyClone

Well-Known Member
#5
There's no manufacturer listed because it's a Chinese ripoff of an IHI RHB31. A real IHI is going to fetch at least $600.

MargayKart79 used one of those on a 5hp Briggs(~230cc) with MegaSquirt EFI) and got it to spool.

http://www.oldminibikes.com/forum/project-logs/1100-efi-turbo-briggs-5hp.html

This is an electronically fuel injected 5hp briggs - Car Videos on StreetFire

Really the engine's naturally-aspirated power output is more important than its displacement.

I used a larger Garrett GT15 on a larger 400cc Briggs flathead and in bench trials it responded about the same way; sluggishly.
 
#6
There's no manufacturer listed because it's a Chinese ripoff of an IHI RHB31. A real IHI is going to fetch at least $600.

MargayKart79 used one of those on a 5hp Briggs(~230cc) with MegaSquirt EFI) and got it to spool.

http://www.oldminibikes.com/forum/project-logs/1100-efi-turbo-briggs-5hp.html

This is an electronically fuel injected 5hp briggs - Car Videos on StreetFire

Really the engine's naturally-aspirated power output is more important than its displacement.

I used a larger Garrett GT15 on a larger 400cc Briggs flathead and in bench trials it responded about the same way; sluggishly.
Hehe, ok interesting. But even still, lowest displacement it calls for is .4L. I was thinking a 5hp and as you stated its ~230cc which is ~.23L? (if I can do metrics?) So while it may spool the benefit you actually achieve.... :shrug:. Wounder how one of these would do on motor with 2x the displacement. :laugh:

Very interesting topic here, and cool vids!
 

65ShelbyClone

Well-Known Member
#7
Again, just ignore the displacement recommendation they slap on the auction description; it's a generalization at best. What works is going to be very application-specific. Pay more attention to how much power the target engine makes without a turbo. Compare the difference between a 13hp Honda GX390 and a 249cc MX bike engine that makes 35hp. The RHB31 is suitable for either one, but it will have much better response on the bike engine.

If you saw the turbo that BMW put on their 1.5L F1 engines in the mid '80s, you'd wonder how something so enormous could be spooled by such a tiny engine. (Truth is, they didn't spool until ~8000rpm and HP jumped from 250 to 800+ almost instantly.)
 
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#8
Again, just ignore the displacement recommendation they slap on the auction description; it's a generalization at best. What works is going to be very application-specific. Pay more attention to how much power the target engine makes without a turbo. Compare the difference between a 13hp Honda GX390 and a 249cc MX bike engine that makes 35hp. The RHB31 is suitable for either one, but it will have much better response on the bike engine.

If you saw the turbo that BMW put on their 1.5L F1 engines in the mid '80s, you'd wonder how something so enormous could be spooled by such a tiny engine. (Truth is, they didn't spool until ~8000rpm and HP jumped from 250 to 800+ almost instantly.)
Got ya. Ill never able to doodle in this area because of funds, but I'd love to see someone get to show it off!

If anyone watches Top Gear- In best Jeremy Clarkson impression,'' POOOOOOWWWWWEEEEEERRRRR!!!!''
 
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