Supercharged GS?

One person here has fitted a nice turbo. But it is a sensible mod - no great horse power gains at the expense of low end torque. So the extra strain on motor/gearbox/drive shaft etc is 'reasonable'.
 
Number8 said:
...possibilities are a diff alternator , or rework this one so it has a shaft of the back to run the blower ..
Click to expand...

I had in mind the same thing - driving the blower off the back of the alternator would mean no need to modify the belt setup, as long as the gearing was appropriate.

Number8 said:
.......the plans have been drawn up to have a piece made up to house both injectors and a double K&N roundabout where the airbox was.
Click to expand...

If I understand this correctly you're going to have the injectors up on top of the engine with really long inlet tracts from there down to the heads? Doesn't sound like a good idea - you need the injectors as close to the head as possible otherwise the air/fuel will separate out and you'll never get it to run properly, particularly at lower speeds.

Number8 said:
...Was looking at a rotrex C15 but having to find space for the inter-cooler would be a pain
Click to expand...

Using an internally-stock engine you won't be looking for much boost, otherwise the thing will blow up. Running a low boost I wouldn't expect that an intercooler would really be necessary since you won't be heating up the air by much.
 
sproggy said:
I had in mind the same thing - driving the blower off the back of the alternator would mean no need to modify the belt setup, as long as the gearing was appropriate.
Click to expand...


don't gorget that the standard belt-pulley arrangement is choosen for about 1hp total power transmission.
 
That's true. Modern blowers like the Rotrex are generally driven by 'ridged' belts of the same type as the standard alternator drive, but you might need to use wider pulleys/belt. This would mean fabricating a new belt cover but that wouldn't pose much of a problem. There might also be an issue with the belt tension required to drive the blower - this might overwhelm the alternator front bearing.
 
sproggy said:
That's true. Modern blowers like the Rotrex are generally driven by 'ridged' belts of the same type as the standard alternator drive, but you might need to use wider pulleys/belt. This would mean fabricating a new belt cover but that wouldn't pose much of a problem. There might also be an issue with the belt tension required to drive the blower - this might overwhelm the alternator front bearing.
Click to expand...

think it may just be a "hope that bmw have over enginered this bit to"
if it breaks ile make up a new system if it dosent ile leave it , be pretty easy to tell when it goes as the battery light will come on! and wont cause to much damage'
if i gotta put a new pulley system ile just leave the cover off , ive ridden about 5 with it off as i didnt notice that it had fallen off :eek :eek :eek: :eek: dont ask !

tbh i think im gonna be using the E45 so im only gonna be looking 30bhp max and thats if the blower is at 14thou rpm , so that up the top limit of the rev range!

im aware of the inlectors being os far away and just hoping that it wont be to much of a prob , tbh with a blower i cant see how to get round it , unless u put it before the injectors and i dont know if that will work? will it ?

the rotrex c15 i think has to have an intercooler ??? either way its to big so thats outa the question

dont think ile have a prob about killing the bearings on the alternator as the blower will be mounted on its own bracket and the shaft will have a uj or summit in it to alow for some movement or summit similar ...

oh and i saw that on ebay , but i missed it as ive not got the net at home yet (on a m8's pc)

if this works ile probally start thinking about bigger blowers but thats engine mods, pistons, rods maybe crank , deffo lower piston nad possibly a home made tank


atm tho the garage is so freaking messy notings dont anything atm ..... bloody moving house !!!! ARGHGHGHGHGHG
 
Number8 said:
im aware of the inlectors being os far away and just hoping that it wont be to much of a prob , tbh with a blower i cant see how to get round it , unless u put it before the injectors and i dont know if that will work? will it ?
Click to expand...

Quite a lot of turbo applications work that way - blowing fresh (or intercooled) air through a carb or throttle body (e.g. Maserati Biturbo). All you'd have to do would be to ensure that the system was airtight under pressure, perhaps using silicon 'turbo hoses' instead of the rubber links, and ally tubing instead of rigid plastic pipes.

Makes it much easier - you just need to mount an air filter (that will withstand the suction!) on the inlet to the blower and then split the outlet to run to to the existing throttle bodies (no change to throttle cables etc). As you said the injectors might not have a high enough flow rate at high revs but if you're only looking at a 30bhp increase they might just be up to the job, otherwise I'm sure there are Bosch alternatives (from a car) available off the shelf.
 
borrachadog said:
Have a look at this http://www.marineturbine.com/motorsports.asp they say it does 0 to 227 mph in just 15 seconds :eek:
Click to expand...

That's been around for years. But it's missing the point a bit - the thread was about supercharging the GS for more power, not chucking it in the bin and buying £100k's worth of helicopter bits with 2 wheels attached.

Any I can't see a gas turbine being an easy fit in a GS......
 
sproggy said:
Quite a lot of turbo applications work that way - blowing fresh (or intercooled) air through a carb or throttle body (e.g. Maserati Biturbo). All you'd have to do would be to ensure that the system was airtight under pressure, perhaps using silicon 'turbo hoses' instead of the rubber links, and ally tubing instead of rigid plastic pipes.

Makes it much easier - you just need to mount an air filter (that will withstand the suction!) on the inlet to the blower and then split the outlet to run to to the existing throttle bodies (no change to throttle cables etc). As you said the injectors might not have a high enough flow rate at high revs but if you're only looking at a 30bhp increase they might just be up to the job, otherwise I'm sure there are Bosch alternatives (from a car) available off the shelf.
Click to expand...

aye after talking to a chap i know whom supercharges big block v8's for a living he said that it would be easier to mount he blower further back and do it that way round ..... so its actually gonna save me some £££
gonna have to get some more plans drawn up which will take time, but not a big hiccup , got some new injectors and fuel flow regulator coming so no worries there

mmmmmmmm set me back a little time wise but hey .... save me spending £££ on summit wont werk
 
:bounce1 chill sproggy just avin a giggle. I know it been around for years but i still think its bonkers :hapybnce:
 
It's an ugly bugger though, isn't it? I know it's larger than the average bike but you'd have thought they'd have tried to make it look a bit better. That's engineers for you, though - form follows function.

Correct me if I'm wrong but you can get the same amount of power out of a turbo'd Hayabusa, can't you? OK, that's missing the point too......
 
Somewhat more subtle than the other blown (twin-supercharged) Valkyrie earlier in the thread! Looks good.
 
Go for the turbo instead!

I built this in just 3 weeks a few years ago.

hjul-005m.jpg


/ Älgen
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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