It is me, Modur, the crazy Bulldog owner from New Zealand.
Well since my last post (GSXR1100 USD Front fork conversion) a lot has changed both in my life. And my Bulldog has had a lot of drastic change also. So much so that I thought it warranted a new post here in the forum.
Firstly life changes:
A little over 6 months ago, I recieved a phone call from a mate I ride with who just so happens to own the local Yamaha dealership offering me a job as a mechanic in his workshop. Naturally I jumped at the opportunity. I'm in a very fortunate position of being able to learn from one of best motorcycle mechanic's in the city. Also I get to work on and often ride many beautiful and wonderful motorcycles and get paid for it
So that leads onto the changes with my Bulldog.
Shortly after the last photo's of my bike were taken. I got the bug to extract some more power from my bike. This generally happens to me with all my vehicles. Hence why I never have any $$$ in my bank account.
While studying info about the XVS1100 engines fitted to our bikes I came to astonishing realization that the compression ratio is a mere 8.5 to 1. That's really low. Previously I spent a lot of time and money getting a GSXR1100 engine to have a compression ratio that low to build a turbo bike. Hmmm
The previously mentioned turbo GSXR I built was rediculously fast, did insane wheelies at all speeds, and was such a goog package that a freind of mine made an offer I couldn't refuse to buy my engine off me so as to put it in his race car. I had only had the bike running for a couple of months but like I said it was an offer too good to pass up. And I have since ended up build him another complete engine as a spare.
-- Montag 10. Februar 2014, 23:06 --
Right now back to how all this relates to my BT1100 Bulldog.
After the deal for the GSXR1100 engines I had a little money and most of the ancillary parts I needed to turbocharge a motorcycle engine. These being an adjustable fuel pressure regulator, fuel pump, blow off valve, and a Garrett T28 turbo.
I did many hours of research as reading information online is free, rebuilding engines because I got it wrong is not.
I found the following:
www.youtube.com/watch?v=_-VLtz0o3xE
XVS1100 with a Garrett GT15 turbo
I was very interested in this guy's bike as it has the same engine as a bulldog. The setup is lacking a bit of finesse and finish but there are good points to what he has done. One thing I did take from his videos is he converted the bike to a single Mikuni HSR42 flat slide carburettor.
Further reaserch found this Mikuni to be the carby of choice to turbocharge a Harley Davidson which led me to stumble on the following after many hours reading about custom cruisers:
www.streetfighterperformance.com
Buell XB12s with a Garrett GT2256 Turbo and 187HP!!!
Everything about this bike is stunning. There is a lot of work and thought gone into every aspect of the bike. The engine has had the full monty in the form of custom pistons and conrods. This is how come he can run 18psi of boost netting 187hp at the back wheel.
www.unclebobsturbos.com/newbie.html
A great use full collection of photo's and information
This website is a very usefull tool and has a lot of information written in plain english from a guy who has been there and made the mistakes before. I use it as a bit of a "how to" manual on turbocharging motorcycle engines.
So to sum up what I learned to this point
1) The T28 turbo I have is way too big for a Bulldog, It was kind of too big on a GSXR and that engine had more of everything, more capacity, more compression, and most importantly more cylinders.
2) A Mikuni HSR carburetor conversion will make this project a lot easier to accomplish. Both the actual pluming side of things from the turbo to the carby, and tuning when it's all up and running. Not to mention the fact that the standard carbs are a bit of a restriction and would be a bit small when trying to achieve more horse power.
3) Turbocharging a V-Twin CAN be done. There are many turbo Harley Choppers on the net, and I'm sorry to admit it but the Hardly Moving-Soon
does have a very similar engine to a Bulldog in terms of similar stock horse power and similar capacity albiet with a 45deg vee.4) Repeated late nights of looking at information on turbocharged motorcycles on the internet gets you into trouble with one's wife. And that's before she works out how much these plan's I'm hatching are all going to cost!!!!
. Und wenn Du Dich der Lichtgeschwindigkeit näherst, wird sowieso alles flachgedrückt.......
