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MeanBean49

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Posts posted by MeanBean49

    Spondon Turbo winter refresh and makeover

    in OSS Racers

    Posted

    Bit of an update on this.

    Frame and tank are away having repairs from the last 4 years of heavy use, and upgraded slightly.

    Shock is away being serviced,

    And Ive nearly finished building the new stronger engine. Im confident I should be able to run up to 20psi reliably and see in excess off 300bhp

    Billet carb tops should be on their way soon.

    Got a big bag of new bearings and a much stronger rear wheel spacer tube plus a box of various new bits

    Pretty much ready to start chucking it back together as soon as i get the frame back. Before the bodywork goes for its new colourscheme, which will be a bit different

    Will be ready to have its shakedown test at the Donington track day ready for the serious stuff if dicking about at Pendine trying to be the 1st person to hit 200mph on the sand the week after.

    Hopefully it will remain together for a bit of road use and a few Cadwell trackdays and time permitting some Elvington stuff.

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    • Like 9

    wheel swap

    in Oil Cooled

    Posted

    54 minutes ago, R1guy said:

    This is so strange- do you think there are loads of bikes pottering around with <10mm off centre sprockets?

    If they have done nothing to correct for the offset difference then its physically impossible for both wheel alignment and chain run to be right

    wheel swap

    in Oil Cooled

    Posted

    Ive used K1-3 wheels. Not had a look at later ones. I believe the sprocket offset is the same. Oil cooled offset is 10mm different to K-series.

    I ended up having the wheel, spacer and carrier machined down by 5mm, then run a talon sprocket back to front to get another 3mm then a 2mm spacer behind front sprocket to get the full 10mm needed.

    Tons of people will tell you they have fitted busa/TL/srad/k-series wheels and its central and chain run correct.

    Its basically rubbish, impossible without compensating for the 10mm.

    Depending on the bike you might have enough clearence for a 10mm offset front sprocket

    Its a bit of a faff and not really worth the effort unless you really like them or need the weight saving

    Blower Sizing

    in Forced Induction

    Posted

    You have to remember those figures are based on the blower spinning at its maximum and the engine at 10k revs

    In reality it will be way lower, like at 5k revs it will be half (ish)

    Almost not worth bothering with for the amount of power it will sap just to drive it

    Turbo bandit

    in Forced Induction

    Posted

    Standard ignition timing, whatever compression you get from using busa pistons on bandit rods and standard base and head gaskets. Around 8:1 i think.

    Makes 278bhp and 200ft lbs at 15psi on normal 95 octane pump fuel.

    Have got a big intercooler which i think is what helps keep it reliable

    • Like 2

    Turbo bandit

    in Forced Induction

    Posted

    Standard studs and nuts in mine, no need for em, no stronger than stock, wouldnt bother taking anything off pistons either, cant understand how they could ever be a problem unless your fueling is shit.

    Been running up to 17psi in mine on stock rods, busa pistons and standard studs/nuts

    No problems at all. Just need to make sure fueling is good

     

    • Like 1

    Am I missing out

    in Forced Induction

    Posted

    1 hour ago, Solcambs said:

    I don't want to get into any argument about this on a turbo forum .. jeesh!

    MarkGSXR just go do it :o)

    @MeanBean49  - your bike is way better than the one's I have ridden - no doubt about it ... BUT it still sounds less than eager going up Coppice and through Charlie's 1 and 2. Whether that is just because there is a turbo fitted or because you aren't opening the throttle because being on turbo would be uncomfortable, or the gearing means you can't be on turbo I can't tell. So it's pretty subjective. It does seem like you are tentative, especially through Chris and coming out of the horrible off camber Barn corner, your bike off the apex is dropped by the bike in front. Yours is definitely waiting to get on turbo. So it does actually demonstrate my point. Your bike is hugely fast, and who am I to judge your enjoyment of  it  - it's your bike, and I know it would be fun to ride. You can obviously ride BTW ... and even your own description of the video says, "trying to ride my bike with the boost turned up".

    Back to my original point - fitting a turbo does limit some aspects of a bikes capability near the limit of lean, and can have a detrimental affect of driveability in some situations. I guess another way of saying it needs some respect. Bloody hugely fun and addictive I am sure :o)

    Please don't read this as a negative to anything you have done for you, or your riding, or what you want from your bike ... just me saying not for me on a track as I like to ride fast and I can ride closer to the edge of handling (my kick) on a NA bike and that you have bigger cahones than me :o)

    The noise is extremely deceptive, its got that much torque and power its lower in the revs. Certainly isnt struggling anywhere just doesnt need to scream to accelerate, you can see when other bikes are around hiw much faster it is.

    To be honest it was the first time i had ridden it at all this year and the first time i had turned the boost up, thats why it appears a bit tentative.

    I have been round tracks since and i can  ride it as hard as my non turbo bikes now i am used to it.

    Good mate of mine is an ex powerbike champion, he took it out at Snetterton and couldnt praise how easy to ride it is, and how quick, so much so hes going to do a few sessions on it this year to see what it can really do.

    Sounds like your turbo experience is pretty limited to old style setups. Modern well setup blow through kits are amazing when setup well

     

    Am I missing out

    in Forced Induction

    Posted

    3 hours ago, Solcambs said:

    I stick to my guns ... - I have ridden a turbo'd bandit and a turbo'd R1 - neither of which had any guts off turbo, and both were fearsome on turbo. The end result of the bandit on the road was a bike that I couldn't get anything from most of the time I wanted it. In a straight line it was twist, wait ... whoooosh! However spirited riding was impossible as most corners confounded the bike as you enter off boost and daren't hit the boost cranked over. The R1 on the track was a giggle, 210hp of wheel/sky moments and the wastegate noise was hilarious - wind on, hit boost, wheelie, close throttle and chirrup goes the wastegate - wind on chirrup, wind on chirrup :o) However, trying to get cranked over in any corner was an accident waiting to happen. Take Chris Curve at Cadwell on most bikes and you can attack it, driving through the corner. On the R1 you are very conscious that if the turbo hits mid corner you'll be in trouble as it will take what ever throttle you have dialled in and if that is too much you'll be into the scenery. The corner is asking you to wind on, but on the lower compression engine initially winding on does nothing so you wind the throttle more, and then the turbo starts to come on and you have to release some throttle. So you end up trying to go into the corner in a gear that puts you onto boost, and then the turbo starts to run away from you on the slightest increase of throttle. Very unnerving when you are trying to drive through the corner but balance things. I reckon what I am saying is that they aren't easy to ride fast round a track. Too much effort thinking about machine control and balancing inputs. Normally aspirated engines can be taken closer to the handling edge, and I prefer that challenge when riding a bike ... that's mostly why I ride bikes in fact, and the turbo just got in the way of that enjoyment for me   ... I want to lay a bike over feel what the bike is doing close to the edge of grip. Anyhow as I said  .. YMMV ... I'd love one for giggles - but for me anyhow I like powerful normally aspirated engines.  

    My bike is just as rideable as any N/a bike, just has way more of everything everywhere. Pulls from 3k in top with no probs at all. Works plenty well enough on race tracks with 280bhp and 200ft lbs https://youtu.be/VHkK_aO_yfA

    • Like 1

    Am I missing out

    in Forced Induction

    Posted

    9 hours ago, Solcambs said:

    Build one ... but go into it eyes open. It will cost.

    Also be wary that it's what you want from a bike. The truth probably is (based on my own experience of riding but not owning one) that a turbo bike is often typically slower for the most part than the bike that started the process, most of the time. Low compression makes a bike flat and unresponsive. That is until they build revs and get on song. Then they are less of a bike and more like every fairground ride you have every ridden combined into a few seconds of madness. Then you let go of the throttle and do it all over again just because it is addictive. 

    I loved riding a turbo bike, but I want more than turbo induced giggles. I want it to be something I can control and not just ignite and hang on (as fun as that can be)! YMMV! 

    What a load of rubbish.

     

    • Like 4
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