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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 :) > > > > > > _________________________________________________________ > > > Do You Yahoo!? > > > Get your free @yahoo.com address at http://mail.yahoo.com