TURBO POWERRRRRRRRRRRRRR On a 250?

T

twistekeys

Been Around the Block
Just heard someone mention they got a "turbo" for their sub 1000cc motorcycle. How do these work on bikes? And would it be WAY too much for my lil' SR250?
 
Dude! You struggle with basic wiring. Now you are talking about engineering a turbo installation? Get fucking real!
 
I struggle with wiring all the time, clueless with it, but I turbo'd a car before. They are two completely different systems and skill sets.

If you're looking to turbo your bike, I suggest getting a good book and reading through it to help you get a good understanding of the complete system. Physically hooking up a turbo and piping is not that hard, fuel and tuning is the key bit, really need to have a good understanding of this or it will quickly go kaboom. You'll need to figure out if the SR bottom end can handle an increase in power as well. Some cranks and rods just can't take the increase.
 
And you're unlikely to find a turbo that meets your needs. A turbo for a 250cc engine would be very difficult to find.

The world's smallest mass produced turbo is the IHI RHB31. It was originally designed for 660cc Kei cars in Japan. Only at the very highest RPMs would your 250 engine be putting out enough exhaust to spool that turbo.

You'd be better off looking at superchargers.
 
I knew a guy who used a smog pump off an older v8 as a supercharger on a pit bike, don't know if it would move enough air to be beneficial to anything over 100cc though.
 
AlphaDogChoppers said:
Dude! You struggle with basic wiring. Now you are talking about engineering a turbo installation? Get fucking real!
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Wiring is where I fail at. I'm WAY better at engines, especially backyard engineering. But let's "get real" I could never afford anything more than a spark plug. But how's this not fun to think about? ;D
 
HerrDeacon said:
I struggle with wiring all the time, clueless with it, but I turbo'd a car before. They are two completely different systems and skill sets.

If you're looking to turbo your bike, I suggest getting a good book and reading through it to help you get a good understanding of the complete system. Physically hooking up a turbo and piping is not that hard, fuel and tuning is the key bit, really need to have a good understanding of this or it will quickly go kaboom. You'll need to figure out if the SR bottom end can handle an increase in power as well. Some cranks and rods just can't take the increase.
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That's kinda what I figured. I'd basically have to go through the entire engine.
 
twistekeys said:
Aren't superchargers way more powerful?
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Depends on the size and the gearing ratios. A supercharger can be more powerful than a turbo, but that's like saying a V6 can be more powerful than a V8. It's not a good comparison.

What can be said is that turbos are more efficient than superchargers, and so when seeking maximum horsepower, a turbo usually holds the edge.
 
twistekeys said:
Aren't superchargers way more powerful?
Click to expand...

Superchargers arnt more powerful, they are different...

A supercharger works by having a pully that that is turned by the motor. It produces boost at all RPM ranges because its not relying on exhaust. However, because there is additional drag on the motor by the fact that its also powering a turbine it actually produces less top end than a turbo charger.

A turbo charger works by having the exhaust gasses spin a turbine to product boost. Because of this, until there is enough exhaust pressure you wont get boost. On cars, a small turbo should have boost around 3k RPM but being a smaller turbine wont produce as much power, where your HP mosters wont spook until 5-6k RPM but since they are larger produce more boost. Since they dont require the motor to work harder they can actually provide more top end power than your supercharger.

If you dont have the mechanical knowledge and really know what your doing plan to get a few motors, because your going to brake them... or you will just never get them running...
 
When I say Im only going to using half the turbo I mean to only run it right around a pound of boost per thousand rpm. So at 9000 rpm (peak power for this motor) it will be 9 pound of boost. to achieve this I was thinking of running a lead wire from the alternator or voltage regulator to a solinoid in consert with the blow off valve.
 
Damn so much hating going on lol, on a 250 niether turbo or supercharger is going to work for you. Decrease the weight of the bike, flywheel ect, make it a rev moster and then throw in a touch of nitromethane, water alcohol/menthol and or the ever popular nitrous oxide (go really light on the pressure) . On that note the little brass nozzles in your bic lighter after you take it apart it just the right size for an injector, ive fitted them side by side inside the vacume ports just after the carb. for the nitrous leave the tip alone but on ther fuel nozzle use a really small 45 degree counter sink on the tip all you have to do is put a slight 45 bevel on it. Just dont go to crazy nobody like cleaning up after a grenade.
 
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