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Kawasaki GPZ 750 Turbo

Discussion in 'Biker's Cafe' started by PyroboyUK, May 20, 2007.

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  1. PyroboyUK

    Wise Guy

    Joined: Apr 19, 2006

    Posts: 1,642

    Hey there,

    I currently own a 2007 Yamaha Fz6 and i really like this bike, however i have this urge that one day to own a Motorbike with a turbo charger fitted to it. Today i seen a bike called the GPZ 750 and it was fitted with a turbo. I have done some research to find out that the bikes come standard with a turbo fitted. It seems to have around the 100hp mark which would be more than enough power for me, i would really just like the noise of the turbo. I have already had some insurance quotes and at the moment i am paying £1050 for the Fz6 but would only have to pay £500 for the GPZ 750 turbo.

    If there are any owners or people who just know anything about this bike it would be much appreciated for any feedback on it.

    Thanks
     
  2. penski

    PermaBanned

    Joined: May 9, 2005

    Posts: 20,834

    Location: NE8

    not an absolute killer of a bike by all accounts but well worth it for the curiousity factor alone.

    get a turbo bolted to your current bike.

    ...and a bottle of passing gas too...

    *n
     
  3. atpbx

    Capodecina

    Joined: Oct 21, 2002

    Posts: 21,452

    They were awfull when they were new and nearly 25 years later are even more awfull.

    Sportsbikes in the early 80's were toilet, utter utter garbage, kawasaki came along with the GPz 750 and basically had the best bike on the market but it was still rubbish.
    They bolted a turbo on it, it was now slightly more powerfull rubbish.
    Then they released the Gpz900 which relegated the turbo to the dustbin AFAIK as it was just as powerfull but more reliable.

    Both were consigned to the great 80's motorbike skip in the sky with the arrival of the FZR, GSXR and kawasaki themselves with the ZXR.
     
  4. quad

    Gangster

    Joined: Oct 7, 2003

    Posts: 450

    Location: at my desk

    hmmm bike with turbo eh?

    this would be an obvious choice :eek:
     
  5. mrgubby

    Mobster

    Joined: Oct 21, 2002

    Posts: 4,878

    Location: 30 miles north of London

    My mate had one in the late 80s , it suffered from bad Turbo lag & by the time the power kicked in it was time to change gear.
     
  6. divuk83

    Wise Guy

    Joined: Mar 8, 2006

    Posts: 1,313

    Location: York

    Guy who posts on 200mph.org called Lorcan is probably a good person to ask about them.

    His site (Complete with forum):

    http://www.750turbo.com/

    His 750 (810) Turbo

    [​IMG]

    Dave
     
  7. Ev0

    Capodecina

    Joined: Oct 18, 2002

    Posts: 13,753

    I'm not a bike person, but that looks sooooo cool.
     
  8. helpimcrap

    Capodecina

    Joined: Jan 13, 2004

    Posts: 12,395

    Location: Leicestershire

  9. Dogbreath

    Capodecina

    Joined: Oct 18, 2002

    Posts: 16,650

    Location: Devon

    The GPZ750 was an absolute corker in comparison to Hondas efforts.

    May I present the CX500 Turbo.
    [​IMG]

    A fairly awful bit of machinery in normally aspirated form that didn't get any better with the addition of a whirly snail bolted onto it.
     
  10. Avalon

    Soldato

    Joined: Dec 29, 2002

    Posts: 5,532

    Putting a turbo on a bike that's under 1ltr is pretty pointless according to people who know a hell of a lot more than me. I was lucky enough to spend a good while talking turbo bussa's with several co's a year or so back for a project never got the backing i'd hoped for.

    As stated 80's sports bikes were pretty poor by any modern standard, they were down on power and when you got going the brakes left a hell of a lot to be desired, parts can be an utter pita and the handling will be sloppy by comparison. Also if you aren't mechanically minded then you'll either need to learn sharpish or have the money to pay someone who is. You are talking about a 25 year old bike, you'll find it will more than likley be begging for a full tear down and rebuild sooner rather than later and that's going to take time and a mechanic's time isn't cheap. If you've got an R6 and want a project then perhaps but go in with your eyes open, what you save on insurance will only buy you a spanner monkey for 10 hours.
     
  11. Tomsk

    Soldato

    Joined: Oct 18, 2002

    Posts: 5,181

    Location: Overground, underground..

  12. PyroboyUK

    Wise Guy

    Joined: Apr 19, 2006

    Posts: 1,642

    Thanks for the feedback guys....

    Penski...I have thought about putting a turbo on my bike, all i would really want is just a small one, not looking for huge power increase like the 400+ Bhp Hayabusa's. I really just want that noise of the turbo, everytime i hear a car with a Dump valve fitted i just love the noise it makes!
    Only problem is though while i can maintain my own bike etc i have no knowledge what so ever of fitting a turbo to a bike.....
     
  13. Dave L

    Wise Guy

    Joined: Oct 11, 2003

    Posts: 2,043

    Location: Somerset

    You can get electronic gizmo's that mimic the sound of a turbo & dump valve but they are rather chavtastic!!! :eek: :rolleyes: ;)
     
  14. mrgubby

    Mobster

    Joined: Oct 21, 2002

    Posts: 4,878

    Location: 30 miles north of London

    I've go memory at all of my mates bike making any dump noise :confused: , could be because I was wearing earplugs / crash helmet and had a straight through exhaust on my bike :D
     
  15. Bug One

    Capodecina

    Joined: Oct 18, 2002

    Posts: 10,170

    Location: Sandwich, Kent

    Putting a turbo on a bike just because you like the noise turbo'd cars make is ridiculous.
     
  16. PyroboyUK

    Wise Guy

    Joined: Apr 19, 2006

    Posts: 1,642


    :D the earplugs will have drowned most of the noise out.

    I am not really clued in on turbos but as i understand just the turbo on its own the only noise i will get is like a high pitched whistle as it spins at the high Rpm's. I have heard a few Imprezas that have either a Dump valve or wastegate :confused: fitted and it makes a kind of Hissing noise and you change gear. Thats the noise i would like from my bike.

    I have looked for a turbo kit for my Yamaha FZ6 but doesnt look like anyone makes a kit for it, the only kits i have found is for the GSXR 1300 Hayabusa and the Bandit 600 and 1200. So im guessing that if i want a turbo for my bike i would have to custom make all the parts for it :confused:
     
  17. PyroboyUK

    Wise Guy

    Joined: Apr 19, 2006

    Posts: 1,642

    tbh i cant see why...

    I would get a very nice power increase along with a fantastic soundtrack.

    Doesnt look like its going to happen if there are no turbo kits for my bike though :(
     
  18. penski

    PermaBanned

    Joined: May 9, 2005

    Posts: 20,834

    Location: NE8

    it sounds like a perfectly fine excuse to me...

    right, a very basic list for a turbo conversion is...

    turbo
    intercooler
    exhaust manifold
    exhaust
    inlet plenum
    hoses
    oil pick up
    oil return

    If I were in your position, I'd certainly look at a project bike instead of your daily.

    pick up an old gsxr or similar and get into the straightliners scene...

    *n
     
  19. Dogbreath

    Capodecina

    Joined: Oct 18, 2002

    Posts: 16,650

    Location: Devon

    For the same reasons that turbos never took off on road going bikes. For those that like to live their life a 1/4 mile at a time, these issues don't apply.

    Turbo lag in a car is annoying, and can induce pant filling on more powerfull cars, on a bike it's just dangerous. To drive a bike quickly you need smooth, controllable power delivery and a turbo, unless small and low pressure, doen't realy provide that.

    Physicaly fitting a turbo onto a bike is also problematic, there isn't much space for a big lump of red hot glowing iron to sit without it cooking various parts.

    Performance bike engines tend to run a fairly high CR is standard form to be able to achieve tehir high specific output, e.g. your FZ6 is 12.1:1 Adding forced induction would be a recipe for detonation and melted pistons. Lowering the CR correctly means taking the engine to bits, machining pistons/head, and this immediately reduces off-boost performance and economy.

    Penskis list did not include the cost of an aftermarket ECU and the mapping costs (assuming that the stock ECU isn't not suitable for remapping for FI).

    If you desperately want a turbocharged bike it can obvioulsy be done, but it could cost a significant amount and the results might be dissapointing for fast road use. Easy solution, sell bike, buy a faster one and forget about silly dump valve noises being cool.
     
  20. penski

    PermaBanned

    Joined: May 9, 2005

    Posts: 20,834

    Location: NE8

    this was the reason for me uggesting an old gixxer project or similar; carbs that can take 1bar comfortably, cheap parts and mechanically simple enough to cut your teeth on.

    no efi/mfi means you only really have ignition to worry about.

    as an aside, whilst you're around, what are your thoughts on a carb-fed bike lump being used with a positive-displacement blower at around 7psi? the high static CR shouldn't really be a hinderance and a chargecooler should keep inlet length and charge temps down...

    *n
     
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