Big waste of money for fun

[ducatilover]

I am starting a big waste of money for fun project, a turbo 250.... yup I have gotten too bored, have drawn up the plans for the manifold and for the cam specs so far. I am just trying to hunt down the right size turbo [3 cm2 = 0.14 A/R, 4 cm2 = 0.23 A/R, 5 cm2 = 0.32 A/R or something around those lines]
Obviously I will be running a new fuel system, jetted carbs [hopefully the cv carbs wont mind the blow through system] and two vacuum operated fuel pumps, or electronic with a rising rate fpr. not too sure yet on that. obviously for a vacuum operated fuel pump system I cannot have a longer than 232deg [@1mm] duration cam, the intake vac will drop too much spark system, I am going to do an old trail and error type thing here, leave it as is....
I already have the inter cooler...
whaddaya think guys? plain stupid or interestingly stupid?

[325rocket]

fucking brilliant idea.
how will you run the oil line and get correct oil pressure?
i have "turbo'd" a few now turbo engines before let me know if i can help!

[EJK]

Don't forget the LED lights!

[ducatilover]

fucking brilliant idea.
how will you run the oil line and get correct oil pressure?
i have "turbo'd" a few now turbo engines before let me know if i can help!

Oil line will be taken from sump on the pressure side of the oil pump [according to my plans] and return to the sump.
I am thinking it may be best to run a remote oil pump just for the turbo?
I am trying to track down a suzuki 660cc 3cyl turbo.

[ducatilover]

Don't forget the LED lights!

hahaha this is not a joke hyosung so leds are not needed

[EJK]

Hahaha if so, good luck!

[ducatilover]

Hahaha if so, good luck!

cheers, I see many snapped rods in this project...or melted pistons....

[Gubb]

Lemme know if you're racing in the Hyosung 250 GP class.

[ducatilover]

Lemme know if you're racing in the Hyosung 250 GP class.

hmmm I don't think my Honda is allowed....

Right I will buy a ct9a snail and see how that goes, smaller than an early td04 from what my research says.
anybody offering helpful advice [and hyosungs number perhaps they will make a turbo] will be rewarded with beer in eketahuna, I may drink it for you

[FROSTY:Me]

Old mans old memory. I think you may run into issues with your carbs.
Yamaha with the xj650 turbo had to modify the carbs in some way
Sorry dude can't remember the exact details.
The bloke to talk to is the guy that built the wikked Gixxer thou turbo

[ducatilover]

I think the carb issues were vacuum holes being the wrong size in CV carb

[Blackshear]

You might wanna brush by FI with it, to squeeze some more power out first.
I remember reading a group of blokes FI-ing their CBR or sommat, reckoned hitting the limiter gave them backlash.

[ducatilover]

I don't want to go with FI just for two reasons, I will be doing this all myself and do not have the correct programs available anymore to program an injection system and I want to see how it will turn out with dirty old c.v carbs

[Blackshear]

I don't want to go with FI just for two reasons, I will be doing this all myself and do not have the correct programs available anymore to program an injection system and I want to see how it will turn out with dirty old c.v carbs

Do it cleanly!
No hideous coolant re-routing

[ducatilover]

Do it cleanly!
No hideous coolant re-routing

There won't be any coolant re-routing as far as I am aware It will take me quite a while to get the fuel side of things right and hopefully I can get it quite good without melting anything. I have decided to use a HT 18S-BM from a 12at mazda, turbo is only good for 6.2psi efficiently and that suits me. has a twin entry adapter that is easily found and is similar enough sizing to the standard header diameter so I don't have to completely re make the exhaust system, also has a small 52mm [from memory] exhaust wheel and comes on boost fairly quick