hi all
OK I've got sitting in my garage 1 chassis
and 2 gsxr750 engines !
where would i get a transfer box from?
would these engines be a total waste of time !
just thought as i have them sitting there i may as well try to use them !
already got a zx9 bec
so want another project for the winter !
your thoughts please gentlemen !
cheers Paul
Why not do the Z Cars thing and face one to the front and have 4 wheel drive ?
That's not road legal though. There has to be a common driveline at some point. ie a transfer box.
mid mount side by side is your best bet like the grassers do, but work out your power to weight too it wont be much better than busa power 
I can assure you there is no requirement for a common driveline, my engines drive each rear wheel independantly of each other, passed SVA June 05. I
have a copy of email from SVA's Bob Taylor at Swansea basically indicating this is ok
Works a treat too, tho' it was a pain to engineer & I wouldn't want to do it again!
Personally I'd sell both engines and use the procedes towards buy a turbo bike engine of larger capacity or an S2000 engine.
Be cheaper and easier to engineer.
Transfer boxes aren't cheap.
BTW IIRC GB Engineering make the transfer boxes for Z Cars / Tiger.
I could've sworn you couldn't have seperate engines like that for safety reasons, ie if one goes bang/locks etc. The other twin engined cars I've known of have been track use only as the owners said they could get them legal.
i think u can drive seporate wheels, its driving different axles thats not legal. i now a company that made a twin engined 5 turbo. wasnt road legal, but he still used it tho. lol
Ah, that could be it the difference, ie the axle/wheel thing. Although I'm suprised the men in gray would allow it all the same.
They're good as a novelty/talking point and sound , but a twin will be MUCH more expensive to build and run than a single engined car,
you're looking at ~£3k for a transfer box unless you can expertly steer a CAD package and have a CNC machine shop in the back yard. Also
there's the other added costs like 2 exhaust systems that will need to be custom made to fit alongside each other (ie best part of £1k)
Then if you do all that you'll end up with a car maybe weighing 600kgs with approx 200bhp at the wheels, meaning its not going to be any quicker
than a 180bhp busa (150bhp at the wheels) BEC that weighs ~450kgs, and MUCH less reliable.
Chris
Tiger had a twin engined beast I went out in once. You could have both engines on or keep one for spare when someone wants to race you off the lights.
Either way impressive. It had twin gearleavers so it must have kept the boxes on the engines and then combined the power on the propshaft.
Best ring and find out.
I would think driving seperate wheels on the same axle would if anything be worse unless they were connected together with a diff of some kind?
What about a Gixxerkart ?? Sell one engine to fund the chassis, etc...
or
Build 2 karts
A friend of mine has a twin engined Tiger, one driving front axle, the other the rear,
not linked mechanically and it's road legal.
It has a fancy Motec management system though.
It's the actual car that was featured on Top Gear a while back with Tiff at the wheel.
Yep, I heard from my mate who built the Orange twin ZX9 Westie that the fancy Motec ECU cost best part of £10k to install, and was needed to make it
driveable
[Edited on 21/8/06 by ChrisGamlin]
so has anyone got any plans for a transfer box or just a photo for me to have a look at!
quote:
Originally posted by ChrisGamlin
They're good as a novelty/talking point and sound , but a twin will be MUCH more expensive to build and run than a single engined car, you're looking at ~£3k for a transfer box unless you can expertly steer a CAD package and have a CNC machine shop in the back yard. Also there's the other added costs like 2 exhaust systems that will need to be custom made to fit alongside each other (ie best part of £1k)
Then if you do all that you'll end up with a car maybe weighing 600kgs with approx 200bhp at the wheels, meaning its not going to be any quicker than a 180bhp busa (150bhp at the wheels) BEC that weighs ~450kgs, and MUCH less reliable.
Chris
If I remember correctly, the ECU implements a "virtual" transfer box in software, and makes sure that the axles keep moving at approximately
the same speeds (kind of useful when you're on the road!)
Cheers
Richard
Yep, from what I could gather, without the Motec running both the engines and limiting power to the front wheels in certain circumstances to allow the front to turn in, it was all but undrivable in anything other than a straight line.
Here's Tim's twin ZX9 Westie website, there are a few pictures of the transfer box on there somewhere
Go for it. Most peeps here seem to build there cars then flog them anyway. It'll make you feel all warm and fuzzy inside knowing you've built such a machine! Don't waste them and buy a single engine - its not about the power but the engineering!
chris allanson said the same thing to me about the twin tiger "brilliant as long as you dont turn the steering wheel"
car makers have tried this and dissmissed it vw built a twin engined sirroco in the eighties for rallying but soon binned it.
its one of those creations that costs so much money noone wants to own up to the fact that it doesnt really work too well
http://www.youtube.com/watch?v=u3qtfY0Ps74&mode=related&search
http://www.youtube.com/watch?v=my4OjDAowZA
quote:
Originally posted by Aboardman
http://www.youtube.com/watch?v=u3qtfY0Ps74&mode=related&search
No longer fitted. though.
I wouldn't mind a MTM Bi-moto Audi TT (2x 1.8T VAG units with 400bhp each).
Reportedly does 0-60 in 3.4sec and tops out at 220mph!
http://www.youtube.com/watch?v=hfV8i9TPmoM
Also, Dubsport did quite a nice twin VR6 Turbo Golf Mk3:
http://www.youtube.com/watch?v=9y0QBIYy8N0&mode=related&search=
quote:
Originally posted by Aboardman
http://www.youtube.com/watch?v=u3qtfY0Ps74&mode=related&search
http://www.youtube.com/watch?v=my4OjDAowZA
quote:
Originally posted by chris mason
you be far better of fitting a turbo than another engine
fancy a real challenge try turning them in to a single v8
everyone wich decides to built that but is keeped off because of the motec MCU just do it, i will build for you the mcu...etc
and i bet its not a 9K job..
Regards,
Tks
You only need a fancy ECU if you want to run 4WD with one engine running the front wheels and the other running the rears. For a RWD car the big expense is the transfer box and doubling up on exhausts etc.
is it just me or in the top gear video does tif turn the fia cut out switch the wrong way to start the car, looks like a bit of dodgy footage/editing to me?!
Yep I noticed that too
bloody anoraks