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Re: [turbobike] jet kit for turbo carbs

Christer Johansson (christer.johansson@mbox383.swipnet.se)
Thu, 15 Apr 1999 18:35:11 +0200

Dave,
I think itīs about 1psi. What You have done will probably
work but thereīs never any garantees.
I use a Malpasi boost sensitive regulator.
Good luck on tuesday!

Christer

Dave Morrill skrev:

> Christer,
>     I have pressurized my carbs on my CBR600 exactly in the way you have
> described below.  I would think that by doing this I wont have to mess with
> the springs in the CV slides.  Is this what you found?
>
>     What are you using for a fuel pressure regulator, and how many pounds over
> boost?
>
>     I'm dynoing this Tuesday for the first time, any tips would be helpful.
>
> thanks,
>     Dave.
>
> Christer Johansson wrote:
>
> > Hello George
> > I did send a mail about 3 days agoo to this list ,but it seems
> > to have vanished!
> > Thereīs no secrets in tuning CV carbs for turbo ,just laws of physics.
> > You have to pressurize them right, I have a 1/2 inch hose routed from
> > the pressure pipe (after the intercooler) to the carbs ,connects beneath
> > the membranes ,thus eqalizing the pressure in the carbs and the boost.
> > I also have a thin line routed from the pressure pipe to the vent pipes
> > on the bowls, this "line" protrudes into the pressure pipe (about halfways)
> >
> > facing against incoming air, thus giving dynamic pressure.
> > Sort of "force feeding" the main jets. I used 162,5 main jets on the old
> > setup.
> > But it depends on how this pressurizing turn out, wich mains You will need.
> >
> > I know people that has used 130 mains on 300hp bikes.
> > I will send You picīs , probably will explain it a bit better.
> > I also use stock springs and needles. My bike idles just like a stocker,
> > much better than the Efi bikes I have seen. As longs as Your carbs
> > are tuned correctly ,there is no advantage in EFI.
> > Mark Moisan used 36mm CVīs on his 429hp GSXR.
> > The plastic lids on the CVīs can crack if You go wild on the boost (+20psi)
> >
> > or get a backfire, I have had no problems though.
> > You asked earlier about the data on My old Garrett T03, it was trim60
> > A/R ,48 in this size it will support about 270hp . Port the outlet and fit
> > the
> > biggest possible wastegate valve and it support about 290-300hp.
> > There is no idea to use a bigger A/R as the narrow sector is in the
> > turbine wheel itself, bigger A/R would only yield more lag.
> > You could also separate the wastegate and the turbine and run twin
> > exhaust pipes, this would give even less backpressure.
> > If You want more power than this You will have to use a bigger turbo
> > like the T04E, but then you You will have to use a twin flow exhaust
> > housing ,otherwise there will be to much lag.
> >
> > Hope this helps / Christer
> >
> > george kalogeropoulos skrev:
> >
> > > Now what's the secret behind jetting the stock cv carbs with a turbo?!I
> > > haven't been able to get some real info on what people are using to do
> > > this....is it some kind of jet kit?Who makes the heavier
> > > springs,needles,jets.Everyone is saying that these parts where modified
> > > to work?Can someone give me some real info about this???This has been
> > > tormenting me for the last few nights!My friend says don't bother with
> > > carbs.Christer seems to have this system running really well.Will the
> > > bike idle properly?
> > > Thank guys :)
> > >
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