Turbo'd GS850G

[silent_soul]

Unfortunately My 79 is not a kickstart bike. Which now makes me wonder if it is actually a 79 lol

There are a few GS's that run around town that are stock however I think I will stick with the 850 shafty and look at running a small twin turbo set up and god forbid a single turbo set up lol. I am however seriously considering a bigger chain driven GS for a different project later. And Yes unique but Im not going to be a performance queen about this build but Id thoroughly enjoy having a turbo bike for the sake of having a turbo bike and what more fun than having an engineering nightmare to get it that way.

Something I didnt think about will the turbo setup prematurely wear out the shaft drive setup? assuming Im running a very low boost level.

Edit:

Small update while looking on an s-10 forum for what i thought might be a turbo'd dirtbike I learned a few things. dirtbikes apparently cant be turbo'd and s-10 guys are weird.

anyways i found this posted by a guy on there

250cc = .25L soooooooo looks like im looking for a .5L turbo for a twin set up or a 1.0L turbo for a single set up, which I dont think ill find unless they made turbo's for rider mowers...hmmmm

 

[Steve]

Small update while looking on an s-10 forum for what i thought might be a turbo'd dirtbike I learned a few things. dirtbikes apparently cant be turbo'd and s-10 guys are weird.

anyways i found this posted by a guy on there

250cc = .25L soooooooo looks like im looking for a .5L turbo for a twin set up or a 1.0L turbo for a single set up, which I dont think ill find unless they made turbo's for rider mowers...hmmmm

Besides the actual displacement, you also have to consider the engine speed.
That is why turbos are rated for flow, not displacement.

Many years ago (back in 1975) I had a turbo installed on my Toyota Corolla. The guy that did it used the same basic equipment that he installed on the 1600cc VW Beetles, because my engine was also a 1600. What he forgot to take into account was that the Bugs would redline between 4500 and 5000 rpm, my Corolla would go to 6500+. There is a LOT more air moving at the higher revs. Forgetting to take that extra air into account cost me dearly. Let's just say that the jetting in the carb was not quite correct.

After that little fiasco was sorted out, it was a great little grocery-getter.

Yes, it got them QUICKLY.

.

 

[silent_soul]

So aside from actually finding small enough turbos to even do a twin turbo set up I need to take into account the increased flow, which Is the whole point.

However a twin turbo set up that equals the same Liters as a bigger single turbo would still function the same the twin turbo would simply eliminate some lag and take up alot more space correct?

so i need like stated earlier something built for a 425cc bike rated for redline at 9K? roughly.

 

[Steve]

so i need like stated earlier something built for a 425cc bike rated for redline at 9K? roughly.

That's the concept. Good luck with your search.

.

 

[silent_soul]

That's the concept. Good luck with your search.

.

Ive started looking into atv turbo's however the closest is a 800cc atv but its a single kit and is 4k and is specifically built for that atv so im gonna hit up some of the local car guys for any turbo options. I emailed a few places that built custom turbos so now ill play the waiting game on that too.

 

[850GT_Rider]

.

Nothing a little JB Weld couldn't fix........

 

[Steve]

Nothing a little JB Weld couldn't fix........

That and a little bit of Mother's Polish.

 

[silent_soul]

Idk a guy at one of the local shows said he had a buddy who fixed a cracked engine block with JB weld, and said the same guy was working on a hardtail'd bike that would be held together by JB weld....I cringe at the idea lol.

Anyways found a 250cc turbo, its a Lombardini TD025M-03C now I can only find people talking about it and non for sale and no one selling them. so i still cant really ball park a price.

 

[Steve]

Anyways found a 250cc turbo, its a Lombardini TD025M-03C now I can only find people talking about it and non for sale and no one selling them. so i still cant really ball park a price.

Don't worry, it will cost a LOT more than you paid for your bike.

.

 

[Steve]

Click HERE to go to turbokart.com.

Select Turbine Projects from the left row of buttons, then select the Turbo eXciter Kart.

Interesting reading.

.

 

[Dave8338]

Nice link, Steve!

OH...if time and money were not an option, just think of the fun one could have!

 

[Dave8338]

And most would agree that tuning a GS for a pipe and pods, is a rough gig. Add to that the 1-15 psi boost AND the carbs and you will spend more money on new plugs, than you did fir the bike.

 

[Steve]

Yeah, but think of how UNIQUE it would be.

.

 

[silent_soul]

I found that turbokart site too and definently booked it for some reading, also came across this:

http://www.sdsefi.com/features/apr00stool.htm

running some turbo setup similiar to this would allow me to have my quad turbo setup, however I will admit im no turbo master. However considering this is all about displacement I cant exceed 1 liter of displacement at 9k or I will cause damage and other bad things.

However what if my displacement is less, As in the link I posted up its a single turbo running on a 160cc motor sooo I could put four on my bike and still technically have room for another 210cc's of displacement but would I need to use that extra available space? Or by not using that id just not be tapping into my bikes full potential(limited as it may be already)

Edit:

well it appears garret makes a turbo for .4L -1.2L motors So I basically could run two of these turbos for a twin turbo set up its the GT1241

then they have 3 rated for 1.0L(my max roughly) to 1.6L Now clearly 1.6L's is too much and so Im curious how these turbos have a range of .8L's for the first and the second is .6L's how can I keep a turbo from "overspooling" i think would be the correct terminalogy. because two GT1241's tuned correctly to .5L's would be perfect for my twin set up.

here is the spreadsheet im looking at btw:
http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/turbo_comparison_sheet.htm

 

[TheCafeKid]

I havent seen anyone mention the fact that the driveline is gonna be hard pressed to withstand the added HP... What kind of HP numbers are you looking at? Are you building this for reliability?? Yes, Im quite aware cars use a similar set up to a shaft drive GS, but they are much more substantial... I dont think a shaftie is going to have the sand to withstand anything worth doing with turbos... But, im no turbo master, or motor building genius either...

 

[blowerbike]

if you really want to turbo an 850 get a GS1000 kit or even a Z1/KZ kit.
both of these kits are really close to fitting and if your bike was a 79 then the GS kit would bolt on.
these kits use rajays with single draw through carbs and don't require a huge amount of oil pressure.
all the multi turbo stuff is just fluff..
to turbo or not to turbo..
that is the question?
and yes..

with a tight clutch a 850 turbo can run a 10

 

[Guest]

Too many turbos

Too many turbos

Why not just use one? MAybe, you can find one from a CX650 turbo or the little 3 cylinder Suzuki/Geo/Chevy Sprint? You don't gain anything with more. But if you buy a new one, you have the choice of shoosing the air flow and the A/R too. How much boost to run? And then, you can actually blow thru the stock CV's. Actually, it works really well. But there are other things needed to make it work so this was a teaser. Start looking at turbo bike web sites. And, why not get a 1000G engien to start with? Much easier to get parts for it. Note, you can space the cylinder and head up a little to get 8:1CR. But max boost and cylinder pressure will need to be kept under control as the stock pistons are cast and really won't last long. Welded crank? HD Clutch basket? Maybe even spring for a straight gear set? I think the rest of the drive line would stand up to more power and torque. Look at the GSX1100G. Used the same ring gear diameter along with much the same universal joints and even the splined read drive is the same.
Some food for thought?
Laters
G

 

[TheCafeKid]

WHATEVER you do... if you plan on using turbo...or any "hot mods"...get yourself a heavy duty clutch backing plate or just have the clutch done.. Oh the terrible terrible things that can happen to a helical clutch basket that sees more load than it can take...

























BOOOOOOOOOOOOOOOM!!!!

and there you are, sitting on your arse in the middle of the road wondering WTF just happened...and your poor bike has a freshly ventilated set of cases...

 

[Steve]

...and your poor bike has a freshly ventilated set of cases...

Yep, kinda takes the concept of "air-cooled motorcycle engine" to a new level.

.

 

[Dave8338]

BOOOOOOOOOOOOOOOM!!!!

and there you are, sitting on your arse in the middle of the road wondering WTF just happened...and your poor bike has a freshly ventilated set of cases...

Yep, kinda takes the concept of "air-cooled motorcycle engine" to a new level.

.

Maaaannnnnnnnnnnnn you guys be peeing on the parade!

OH...watch out for a lean burn condition and pre ignition when really spool'n. Twill makes Steves' Corolla piston look like an uncut jewl and yours, like a wad of gum, under the bleechers, at the World Series.

Seriously, anything can be done and in some cases...should be. If this is something you really want to spend time and money on, GO FOR IT! I'll cheer you on!