Yep... another 250 turbo thread. Turbo newb needs help.

[mops]

Sounds like a plan.

I'd be keen to help aswell. I do standalone ECU's, etc. I could convert those carbs to Fuel Injection and then standalone ECU it on cheap.

but yeach, as others pointed out already:

1. you need $$$ available now. including some extra for unforseen expense.
2. even if you spend major $$$ on things like forged pistions, rods, crank, there always will be weak points of the setup limiting your power or breaking often (think cracked heads - kinda hard to strendgten them, unless you are prepared to mill one out form titanium). i.e. reliabilty at power canno be guaranteed. 250cc bandit makes 45hp....
3. it will be difficult to find siutable turbo
4. after fitting custom crank/pistions/rods, the cc rating will be about 400....
5. you migh consider supercharger...

in the 80's F1 cars ran FI, so out of about 1500cc's (BMW M10 block) they were pulling about 1500hp @ boost levels 4 bar or even more in some cases (= over 60 psi)

[Crasherfromwayback]

(think cracked heads - kinda hard to strendgten them, unless you are prepared to mill one out form titanium).)

Stay away from LSD.

[Mr. Peanut]

Jesus just NOS the fucker... Waaay easier

[DEATH_INC.]

Don't knock this idea, there's a 250 yammie running around aussie that has some pretty serious go.....
I'll be at the KB trackday on sunday, come have a chat.

[imdying]

Out of curiosity, what is 'pretty serious go'?

[Two Smoker]

Out of curiosity, what is 'pretty serious go'?

If death is saying pretty serious go... im thinking it will be pretty fucking fast...

[imdying]

Heeheh, that's what I was thinking!! If nothing else, a 17000rpm turbo bike would be a little slice of the future

[ducatilover]

i want to supercharge my spada.

[Mr. Peanut]

NOS your spada

[MikeyG]

My understanding of turbos is that they like nice continuous exhaust flow rather than big pulses. So if your bike is a 4 turbo it if a single or twin a supercharger may be better.

For something really ambitious try the 500 single with a supercharger.

[scracha]

I'm sure my old boss Malcolm at Econohonda has a Maggot...sorry...CX turbo that has had SERIOUS modifications. Mibby he could do worse than speak to him? Think he's even got some turbo bits lying around that could be grafted onto a tiddler.

Silly project if you ask me though....squeeze a 4 or 600 motor into the frame (or a TRX 850..they're wee) and just don't tell anybody if you want a "sleeper".

Make a turbo diesel bike and I'll be intersted

[cheese]

be a funny bastard and fit a motor out of a 450 moto cross bike.

that would be fun, and loud!

[speedpro]

You need something like an IHI RHB31 turbo. They use them on Suzuki Cappucinos which have bigger motors but that isn't the whole picture. Lovely little things, watercooled as well. Go with injection, soooooooooooooo much easier to setup once you start pushing things. Or . . . . . . . . . what about a little supercharger. Again I think there were tiny little ones that were used in aftermarket kits for Cappucinos that you can get. I got my RHB31 from an engine importer and the little supercharger from a 4WD place in Chch - Falsegrave I think. Pretty wrecked in the drive part but rebuilt in the garage OK. If your bike is anything like a FZR250 I reckon it'll be good for a bit of boost. I'm mucking round with one, well I was till I started the new job, and I'm very impressed with the bits inside. I've o-ringed the barrel and made my own copper head gasket. Simple maths will tell you how thick to make the gasket to lower the compression to where you want it and I took the cams to a place in Pukekohe who mapped them and then gave me a suggested set of centres to install them at. There is a lot of funny ideas out there, make sure the advice you get is from someone who has actually done it rather than someone who has just fitted a BOV to their hot hatch.

Re the whole project, I say go for it.

[speedpro]

That Rajay in the first post would be similar to the one used on a Kawasaki Z1R-tc. Big and old, you don't want it. Would suit about a 1L plus engine. They survive good on low oil pressure which is why they were used on Z1s.