Welcome to Netrider ... Connecting Riders!

Interested in talking motorbikes with a terrific community of riders?
Signup (it's quick and free) to join the discussions and access the full suite of tools and information that Netrider has to offer.

Turbo Kit for CBR250RR

Discussion in 'Technical and Troubleshooting Torque' at netrider.net.au started by robbied, Jan 23, 2006.

  1. Does anyone know anything about aftermarket turbo kits and how they affect the bike. I know quite a bit about turbokits for cars but im unsure about how they affect bikes. I saw a turbo kit for CBR250RR, is this just a gimmick or would it work?

  2. Why would you even contemplate it?

    A 250 is a 250 for a reason, it's ment to be slow, it's designed so you don't get yourself in a heap of trouble whilst you learn to ride a motorcycle on the road.

    I'd akin it to an ejector seat in a helicopter :)
  3. But ive seen one! it was on James Bond!
  4. actually there's a damn good reason you'd attempt it.
    If you're a little guy, so a 250 suits you, and you like 20000rpm screamers.

    as fun as big motors are, they don't rev like that.
  5. Yes, because altering the compression ratio by swapping the head gasket for a thicker one is just not technologicky enough... :roll:
  6. Well, a motor is a motor. What difference, ultimately, do you expect there to be between a turbo car motor and a turbo bike motor?

    Think it through... someone who knows a bit about turbo kits for cars should be enough of a scientist for that...

    Many moons ago now, Performance Streetbike did a story on a Yamaha FZX250 Zeal that had been fitted with a turbo swiped from a Japanese variant of the 900cc Charade, a one-off intercooler, plenum and fuel rail, efi from... something small, anyway... and an aftermarkety engine management system. There was, of course, a one-off zorst, too. From memory, they left the compression ratio at the stock 10.5:1-ish. In fact, I don't think the engine came apart at all.

    The work was done by S&R Pro in Sydney.

    As for whether it worked... the article included a dyno graph; the stock Zeal's 31hp next to the 70-odd peak hp it made with the turbo, right on the revlimit, still climbing. 120% jump in power from stock, with the engine internally stock. Get that from a small four-cylinder car, and there's likely to be jizz trickling past the cuffs of nearby flappy white Adidas shorts.

    As an engineering exercise, turbocharging a four-cylinder 250 would be fun. Finding out just how much further out of its depth the suspension would find itself as a result, on the other hand, would not.

    You got a link for these turbo kits? Given the cost involved and the transitory nature of 250 race-rep ownership, I find it remarkable anyone bothers marketing it...
  7. Sounds a bit dodgy and a hell of a lot of money. Especially considering you'd then have to invest in better suspension and brakes as well to make use of that extra power.
    The bike would also be a nightmare to insure.
    Better off trading up and getting a 600.
  8. There's a Japanese firm (www.metalspeed.co.jp) that specialises in making turbos (and now superchargers) for 250cc bikes (no CBR250 kits though). Can see the fun in it, although turbo-lag would be a concern - that and the high cost (the kits sell for about $5,000 in Japan). Still if you were prepared to spend some serious $$$ you'd certainly have something a lot more unique than just another "off the rack" 600 supersports.
  9. BWAHAHAHA God this post made me laugh!!
    Like people putting turbos and spoilers on Daiwoo's and Hyundai's...you have to ask WHY BOTHER????
  10. Turbo lag would make it like a 2-stroke... peaky. ;)

    I think it's a lot of money to be throwing at a 250 - particularly given what the money could buy instead. While a 'sleeper' style 250 would be my idea of fun, I think personally the money would be better spent at ride-days and training. I know they'll make you a lot faster than a turbo-kit!
  11. The turbo kit for a CBR250RR is called "CBR1000RR" you can buy them from a local dealer...
  12. Pffft obviously the people saying its not worth it have no idea on turbocharging.

    Teh fact of the matter is turbocharging bikes is all custom casue not many people do it (which is why everyone htinks its ridiculous).

    If you are competent with that kind of thing on a car and can handle a bit of fabrication work yourself then theres no reason it cnat be done cheaply.

    Get as smallish turbo and matching cooler, fabricating the exhaust manifold and the pipework would be the major hurdle.

    All the turbocharged bikes i know of have bene stupendously successful exercises. Good luck to you if you do choose this option.
  13. Old post digging....

    Turbo lag wouldn't be an issue at all if you are leaving stock compression, as when the turbo isn't producing positive pressure, it will be the same as before it was there. Same as when I had a SR20DE with a turbo strapped on. If my cooler pipes came off ( which happened sometimes until I sorted them ), the car ran like a normal SR20 SSS pulsar type thing, where as with my celica with a 3SGTE which had the turbo block and the lower compression, when the pipes came off, it was so sluggy.

    SO with higher compression left stock, you won't notice any off boost difference, as it will be exactly the same as with no turbo.

    Which brings me to the next point. I was able to loose an intercooler pipe with those cars I mentioned before and not have AFM issues as you would with stock management because I always run a Microtech ECU with a MAP sensore. That is the next point because as far as I know, no aftermarket ECU reads revs up to 18,000rpm because they are all designed for cars to my knowledge and no cars rev that high except F1 cars and I doubt they are going to lend you an ECU.

    This means injection is out unless you can find an ECU to go that high. Interesting about the Zeal, how high was that revving??

    I'd also like to point out strapping a turbo onto a car and leaving compression high is more OK than people will have you believe. Having personal experience I can tell you its all about the tune. However, if you

    A) have a carbi fuel delivery system, tuning is much less accurate, which may present performance and safety issues to the engine perhaps leaning out up top

    8) 250cc bikes produce a massive amount of power for their size and tiny pistons, i wonder how much extra power is in them before some components give way. most jap engines are very strong and aren't near their limits, but these little four bangers if scaled up to 2L would be making like 200KW... so that must be close to the limit for their components strength.
  14. They did actually experiment with ejector seats in helicopters - exploding bolts to jettison the main rotor blades. They also toyed with the idea of ejecting between the blades... well, back to the topic at hand...

    A turbo on a 250 would be great for a novelty, but not for the road.