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Rick, I agree,....my Buell has 10.3 /1 (cc'd) compression, 30 degrees max lead and 10 degree retard at 5 psi,....with 15 psi on Cam II and 10 psi on pump,... (no intercooler) although I don't stay in it hard for over a mile,....it doesn't detonate,.....60 miles per gal too ! BTW its easy to tell when it detonates,....if you can't hear it,.....the cylinders lift off the case and it leaks a little oil around the base ! :) Jeff Churchill J.C. Performance 617-06 Bicycle Path Port Jefferson Station NY 11776 USA tech: 516-928-6679 or 516-928-9863 website: http://www.jcperformance.com/ On Tue, 13 Apr 1999 10:07:31 -0700 "Rick" <gsxr1100@ptw.com> writes: >Christer you didn't offend me >The point I'm tring to get across to you is that at 14psi and 10:1 >compression versas > 20psi and 8:1 compression you probably make a little more power with >the >high boost / low compression combination >but the down side to lowering the compression is throtol response is >worse, >off boost >power is worse and gas milage is worse so I still see no advantage to >lowering the compression >on the GSXR motor for the street and for racing you would just use >race fuel >But this is just my opinion. >I played with lower compression in the past and was never happy with >the >results perhaps you have a combination >that works good just like I have one that I'm happy with. >To bad we live so far away from one another or it would be nice to >ride each >others bike and really see >what works best. > >Turbo Rick >350HP Turbo GSXR1100 Street bike >Web Site http://www.ptw.com/~gsxr1100/ >Southern California Timing Association 1998 Fastest Bike of the year >EL Mirage Land speed Record holder 204.626 MPH >E-mail gsxr1100@ptw.com > > > >> Iīm sorry if I offended You Rick ,it wasnīt My intention! >> I didnīt say to change the pistons just lower the cr,. >> As I like to run high boost all the time and there is no race gas >> availeble at the gas stations ,I lowered the cr. >> I have to say itīs amazing that you can get by with stock cr >> and 1 bar of boost on pump gas! >> Without radical modifications (long duration cams etc) >> you shouldnīt be able to charge an engine that is so "maximized" >> as the GSXR with 1 bar of boost without lowering the cr or >> retard the ignition. You must have a really efficient setup, >> as it makes 275rwhp at 14psi = 1bar of boost it would equall >> about 300hp at the crank. Normally you can count on that it >> takes about 1,1-1,3 barīs of boost to double the output of an >existing >> engine, due to slightly lower fill rate caused by backpressure >before the >> turbo and restrictive intake etc. So when "just" converting a GSXR >into >> turbo without raising rpmīs or installing wilder cams or otherwise >modifie >> it, you can count on it producing in the neighberhood of 240 hp at >the >> crank on about 1bar of boost (2bar absolute pressure). >> But I have to say that Dynojetīs seem to show a little more power >> than it should be. My bike made more rwhp on a Dynojet bench than >> it made at the front sprocket on a Superflow waterbrake, this with >slightly >> less boost! I dont know how much hp I made at 20psi, it made 267hp >at >> 16psi (about) on the front sprocket (superflow). >> Hey Jesper are You from Sweden, Gothenburg? I have seen a twin turbo >> VFR here and there cant be to many of those around? >> regards / Christer >> >> Rick skrev: >> >> > well that's what this list is here for so we all can learn >> > but I think 8:1 is to low for the GSXR motor >> > the combustion chamber is so efficient that you don't have to >lower the >> > compression >> > I run a squish of .050 on the GSXR any closer and you are going to >have >> > contact >> > how much power do you make at 20 psi?? >> > yes I do run water injection for land speed racing ( 2 to 7 miles >at a >high >> > boost setting ) >> > but not because the engine detonates because the water injection >reduces >the >> > thermal >> > stress on the engine and makes it last longer. >> > I just see no reason to waste money on part you don't need. >> > the stock pistons have proven them self's to me,after racing it >all year >> > making over......I don't know 150,200 dyno runs.........you tell >me >> > would you change anything? >> > >> > Turbo Rick >> > 350HP Turbo GSXR1100 Street bike >> > Web Site http://www.ptw.com/~gsxr1100/ >> > Southern California Timing Association 1998 Fastest Bike of the >year >> > EL Mirage Land speed Record holder 204.626 MPH >> > E-mail gsxr1100@ptw.com >> > >> > > I have to disagree with You Rick. >> > > I also run 8:1 cr and it hasenīt lost much compared to stock. >> > > Have You measured Your squish band? Itīs a bit lose on stock >> > > motors. If your gonna use a squish band ,run it real tight like >0,8mmīs, >> > > or dont at all. Gsxrīs doesent seem to react that much to having >no >squish >> > > band (dyno tests). I have runned 20psi on pump gas with no >problems. >> > > Rick didnīt You use water injection when running high boost? >> > > >> > > best regards / Christer >> > > >> > > Rick skrev: >> > > >> > > > The 1052 motor has 10:1 stock and the 1127 has 10.5:1 >compression >> > > > I can run about 12 to 14 PSI on pump gas making 260 to 275 HP >to the >> > > > rear wheels. >> > > > >> > > > In my opinion you went WAY to low in compression and if you >put a >thick >> > > > base gasket under the cylinder or a thick head gasket you >killed >allot >> > > > of efficiency by opening up your squish >> > > > >> > > > Turbo Rick >> > > > 350HP Turbo GSXR1100 Street bike >> > > > Web Site http://www.ptw.com/~gsxr1100/ >> > > > Southern California Timing Association 1998 Fastest Bike of >the year >> > > > EL Mirage Land speed Record holder 204.626 MPH >> > > > E-mail gsxr1100@ptw.com >> > > > >> > > > > I'm curious, what's your compression ratio and how much >boost >can >> > you >> > > > run >> > > > > on pump gas? >> > > > > >> > > > > Dropping compression on my bike was a pain in the butt, but >I >wanted >> > to >> > > > use >> > > > > pump gas. I went from 12:1 to 7.9:1. >> > > > > >> > > > > thanks, >> > > > > Dave. >> > > > > >> > > > > Rick wrote: >> > > > > >> > > > > > Hi George >> > > > > > >> > > > > > > >> > > > > > > Hi my name is George and I live in montreal,Canada. >> > > > > > > I have a nitrous injected 1100 gsxr in a 750 frame.The >bike >made >> > > > > > > 137.5hp at the wheel and 190.2 with NOS.Quarter mile >time was >> > 10.16 >> > > > > > > @147mph.I know want to turbocharge but I need some >info.I'm >aiming >> > at >> > > > > > > 210-240hp with stock internals.What turbo can I use that >I can >> > > > scavenge >> > > > > > > from a car?Can I use my stock 38mm carbs and do I have >to >modify >> > > > > > > anything?My friend is a machinist and he owns a tig >welder.We >will >> > > > > > > fabricate the headers and intake.Can a T-3 garrett be >used? >> > > > > > >> > > > > > The T-3 will work >> > > > > > >> > > > > > > How do i get the oil to the turbo and back to the >engine? >> > > > > > >> > > > > > Tap into the main oil gally plug on the right side below >the >> > ignition >> > > > cover >> > > > > > if you mount the turbo high enough you can drain into your >clutch >> > cover >> > > > > > if you have to use a pump or use the suction from the >engine oil >> > pump >> > > > > > to draw the oil out. >> > > > > > >> > > > > > Do I need an >> > > > > > > oil pump?How can I lower the compression using stock >pistons? >> > > > > > >> > > > > > leave the compression alone >> > > > > > I run mine stock with 26PSI >> > > > > > >> > > > > > Turbo Rick >> > > > > > 350HP Turbo GSXR1100 Street bike >> > > > > > Web Site http://www.ptw.com/~gsxr1100/ >> > > > > > Southern California Timing Association 1998 Fastest Bike >of the >year >> > > > > > EL Mirage Land speed Record holder 204.626 MPH >> > > > > > E-mail gsxr1100@ptw.com >> > > > > >> > > >> > > >> > > >> >> >> > > >