GS Turbo

[marcovandevelde]

Hi Nerobro,
I'm not really familiar with the matter you desribe here, so forgive me if I don't fully understand. The reality as I experience it now with my bike, is that the fuelling behaviour (according to my A/F meter) is almost the same as the standard bike was. Because of the ''ram-air'' boost compensation of the floatbowls, you get slightly richer mixture on boost. This is what you want for the turbo! Driveability is really great on my bike. I only need to put a priority breather valve on the bike (got it lying around) to improve response from idle to boost. It seems a little lazy there.
The GS guy has plugged the floatbowl ventlines as I understand it, this will never work as well as the system I use. He needs four times bigger jets as well, whereas I use the standard ones. I posted this on the GStwin site too.

Greetings, Marco.

[lecroy]

LeCroy it wasn't a jab..
Boost is addictive ya know?!
8)

You can take jabs at it, I don't care. Most people laugh at the color.
..
Agree!!

Thanks for sharing!

NP, just make sure you check my math.

[Anonymous]

Hi Busafied Ron,
Quite a collection. You can turbo just about anything from your lawn-mower to the busa if so you'd want. That's one of those ball-bearing, oil-feedless VNT turbos isn't it? I'm running a Garrett VNT with good result. Have to have it dynoed though. Too busy ridin' it.
Had a look at your Busa-wars site too. Great! Does your busa already run with the turbo? Nice lookin' plenum, home made? Shame about the log header though, you need to build a ''proper'' one when you can. Guess you choose this one to be able to gravity-return the turbo-oil, no? If you run the aerodyne, you don't need to worry about that.

Greetz, Marco.

to answer you questions:

No VNT's in that bunch

The log hdr was done by me, ya it was a rush attempt to get the K26 hung, and since then I realized you can't rush this stuff.
I suck at welding, therefore a local shop is going to finish my hdr.
I have since received new Mandrel Bent tubing to do it correctly, I start Wednesday when the Flange arrives..

The plenum is from a Turbo manufacturer in Canada, RCCTURBOS, with built in velocity stacks.

I am hoping to get it high enough, to allow for gravity return, like most new systems out..

There will be a complete breakdown on my site in the new 2 wks, as the system progresses.

The big one behind the RC is a Turbonetics T61, that is the one going on the Busa.
The T3 in the box, to the left is going on the GS1100.

Peace,
Ron

[lecroy]

There were the messages I had posted about my tests on the GS oil pump on dragbike.com:






siggi_miller wrote:
"Engine oil pressure is directed to the bearing at 30 psi with between 1 and 2 quarts per minute being supplied. [...]"

This is interesting. I lost my second bearing last summer. The first failed after about a half season I think because I would kill the motor before letting it spin down. Today I placed a pressure guauge at the end of the oil line to the turbo and measured about 40PSIG dead head pressure at 5000PRM. I am not sure what the pressure is with the turbo installed. I then measured the flow from the pump and it took about 1 min 40sec to flow 1 quart of oil without the turbo, just letting the oil line feed into a flask. When I measure the return oil with the turbo it is much less, about a pint in a minute. The turbo seems to be quite a restriction. Maybe it's a problem, but I don't see how it would ever come close to that 1 quart / minute with the turbo installed. This is with a single feed bearing on a GS1100 with the 750 gears. Maybe the spec is for the dual feed bearing?


The oil will return faster when the turbo is spinning. I use a clear oil return line and I've noticed this..........


Geek,

here?s a pdf-file of the complete article: http://www.kellyaerospace.com/index.htm/test/RAJAY.pdf

Seem to be single-bearing units only (did Rajay made any dual-bearing center sections?) --- again, these are aircraft specs/requirements.

Contains an interesting brief overview about the various owners, too.



Based on I ran this test a second time with the same setup to see if the spinning turbine made a difference in the flow. This time I let the motor warm up for about 5
minutes and measured the head pressure at 30PSI at 5000RPM. It was warmer outside and I am guessing that the oil temperature made this kind of difference. I then ran the output line of the turbo into a flask and put the engine on the 2-step for 30seconds and measured about 250ml. As soon as I hit the 2-step the flow rate had a major change. So, I agree with what you are seeing with your clear tube.

[Anonymous]

Ummm.... PSI has almost nothing to do with the amount of air coming from a turbo...

Please no flames!

This is the way it works. A turbo has a specific range of PSI where it is most efficient. when you are in this range the turbo produces the most power. Depending on the size of the engine, what CFM it needs and what size the turbo's compressor and turbine wheel are, you can figure out the HP, etc. The CFM @ _ PSI is the important part.

CFM,CFM,CFM!!!

Also, the reason why you don't want to intercool a draw through turbo system is because the fuel has to travel from the carb, through the turbo then through the intercooler to get to the motor. That is the problem, it has nothing to do with plumbing. Oh yeah, one other thing, the more bends you have in your intake/exhaust the crappier it will run! Pretend you are running piping for water, you know that rule where you always stay under a total of 360 degrees worth of bends? remember that, it's a good rule.

Last but not least, i have never put a turbo on a motorcycle before, only like 10,000,000 cars. I'm still working on the whole motorcycle thing. Sorry to seem preachy, just want to help you guys out.


(for the guy who is melting pistons, try a slightly larger exhaust... you will see less torque and probably a little more HP but you will make less heat from the turbo. You might want to try running an oil cooler AFTER the cartridge of the turbo too, like on the drainback side. and whoever said something about the A/F meter, GOD BLESS YOU!!! so many people don't worry about that important stuff anymore)

[Nerobro]

Ummm.... PSI has almost nothing to do with the amount of air coming from a turbo...
*snip*
Also, the reason why you don't want to intercool a draw through turbo system is because the fuel has to travel from the carb, through the turbo then through the intercooler to get to the motor.
*snip*
Last but not least, i have never put a turbo on a motorcycle before, only like 10,000,000 cars. I'm still working on the whole motorcycle thing. Sorry to seem preachy, just want to help you guys out.

Well... Yes. But I think you missed the context. The latest PSI discussion is about oil supply pressure. GS's run at a frighteningly low pressure. At least the older roller bearing ones are.

The reason quoted in my turbocharging books for not intercooling a draw through setup is that fuel will come out of suspention and gather inside the piping and intercooler. That's a BAD thing. Fire hazard, random fueling iffyniess as droplets of fuel pool, and unpool from around the intake piping. Along with bumps and other road ireguarilitys causing splashes of pooled fuel and causing droplets to land on surfaces. Long story short manifolds suck.

some bikes... I wouldn't want to turbocharge. but GS's are both strong, already have low compression, and are fun to play with. :-) I hope you enjoy yours.