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TnNinjaGirl · April 25th, 2011, 07:27 PM

Running a carbed-turbo vehicle sucks. Ya, there were some factory carb-turbo set ups out there, so it is possible, but really not a good idea. In fact, it is easier to switch to fuel injection and then turbo (experience with a BMW 2002).

Also, if it were the least bit of a good idea someone would have already done it. There are some crazy guys over in other countries that do nothing but high performance-fancy stuff with these bikes. There are also tons of American's with more money than sense. These bikes have limiting factors that just don't make it a feasible idea. 130 width rear tire for example... They aren't super bikes, and they were never meant to be.

The engines aren't designed to hold a bunch of power. It's not like strapping a supercharger to a 350, it's more like hooking an air compressor on full blast up to a party balloon. Something has to give.

With all this new found horsepower you (we) are going to need a stiffer frame, larger front tire (read wider rim and new forks/front end) and a larger rear tire (read wider rim and wider swingarm). So by the time you get an engine you can boost and all of the ancillary items to keep the bike physically together and stable.... you don't have a Ninja 250 anymore.

There are the negatives. Now to address some of the issues...

Drag shouldn't be a big deal with an intercooler up front. The bike is small. Bigger bikes do 170mph with no aerodynamic issues. As long as it is sitting in front of the radiator and not hanging off the side of the bike it should be fine. Another problem to worry about it heat soak. Once that intercooler gets heat soaked, say goodbye to your coolant temps. On a side note, the Subaru WRX STi has an intercooler sprayer which works very well.

Megasquirt is your best friend.

If you do end up running boost, I wouldn't do more than a couple 3 psi. The heads and head bolts aren't exactly the best engineered pieces in the world. The bottom end has already been mentioned. These motors are alot like glorified Briggs and Stratton go-cart motors (which I used to build and race).

If you want a cool project, go for it. If you really want to make power out of these motors, there are easier and better ways.

Good luck!

April 25th, 2011, 07:27 PM	#8
TnNinjaGirl Ms. Personality Name: CB Location: Murvill, TN Join Date: Jan 2009 Motorcycle(s): Depends on the week you ask Posts: A lot.	Running a carbed-turbo vehicle sucks. Ya, there were some factory carb-turbo set ups out there, so it is possible, but really not a good idea. In fact, it is easier to switch to fuel injection and then turbo (experience with a BMW 2002). Also, if it were the least bit of a good idea someone would have already done it. There are some crazy guys over in other countries that do nothing but high performance-fancy stuff with these bikes. There are also tons of American's with more money than sense. These bikes have limiting factors that just don't make it a feasible idea. 130 width rear tire for example... They aren't super bikes, and they were never meant to be. The engines aren't designed to hold a bunch of power. It's not like strapping a supercharger to a 350, it's more like hooking an air compressor on full blast up to a party balloon. Something has to give. With all this new found horsepower you (we) are going to need a stiffer frame, larger front tire (read wider rim and new forks/front end) and a larger rear tire (read wider rim and wider swingarm). So by the time you get an engine you can boost and all of the ancillary items to keep the bike physically together and stable.... you don't have a Ninja 250 anymore. There are the negatives. Now to address some of the issues... Drag shouldn't be a big deal with an intercooler up front. The bike is small. Bigger bikes do 170mph with no aerodynamic issues. As long as it is sitting in front of the radiator and not hanging off the side of the bike it should be fine. Another problem to worry about it heat soak. Once that intercooler gets heat soaked, say goodbye to your coolant temps. On a side note, the Subaru WRX STi has an intercooler sprayer which works very well. Megasquirt is your best friend. If you do end up running boost, I wouldn't do more than a couple 3 psi. The heads and head bolts aren't exactly the best engineered pieces in the world. The bottom end has already been mentioned. These motors are alot like glorified Briggs and Stratton go-cart motors (which I used to build and race). If you want a cool project, go for it. If you really want to make power out of these motors, there are easier and better ways. Good luck!