Trevor, I usually run somewhere between 20 to 30 percent toluene.I've also heard that running much more than 30 is a waste of time and can leed to burnt valves.But the F1 boys used to run up to 84 percent toluene with 16 percent heptane with the turbo engines running static 9.4:1 comp and 45psi boost.I;m not sure what there dynamic comp was though.They say they could get 10 deg more ignition when compared to 30 percent toluene. I used to run only 20 percent with the old leaded super as they used toluene in its make up.The bp ultimate is claiming to use less than 1 percent toluene so i mix 30 percent with that.Ive tended not to allow the turbo engines to detonate before uping the octane.I think there are to many variables to state what octane will stop detonation at whatever boost levels.Eg.A mates ca18det s13 couldnt sustain any more than 12psi in standard form with ultimate 98 but with a front mount supra intercooler it would cope easily with 15psi with no sign of det.Peviously we had to use toluene to get 15psi.However my L20 would handle 20psi with no intercooler(water injection)with 98 octane.It would run 25psi with toluene(20-30percent) with no detonation that i could here.Ive also had it to 35psi using C16.I think that even if a boosted up turbo engine has no signs of detonation on the street that a good quality octane booster or toluene should be added for the track as high speed detonation can go undetected and can do damage especially with prolonged boost that you see at the track.Just my opinion. Some testing that ive seen report that nulon prostrength and nf black being the best of the octane boosters with gains of 2.8 ron with the nf being the best value.30 percent toluene gives around the same increase.A rumor going around the drag racing circles over here is that adding 15 percent ultimate98 to avgas actually increases the octane.Where going to test this theory on the plymouth road runner drag car as we know exactly what ignition it will handle with avgas.
Andrew Smith "Pooley, Trevor" wrote: > Andrew, > > What mix of toluene to 98 do you run? I remember seeing something on the > web/list a while back. From memory if you increase toluene content beyond a > certain point, it follows the law of diminishing returns if you know what I > mean. > > Can you give us more info on what fuel stopped detonation at up to different > boost levels in the engines you have run? This stuff tends to be like > opening a can of worms and only real time testing on the track gives the > best rule of thumb as to what you can get away with. > > Thanks > Trev > > > -----Original Message----- > From: andrew smith [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, 18 December 2001 23:00 > To: [EMAIL PROTECTED] > Subject: Re: > > Mark, > After reading a few controlled tests on octane boosters the only ones i > would use would be Nulon Prostrength or NF black.I usually use toluene mixed > with 98 for the drags just for a safe keep when the boost is high.I have > also used vp103 motorsport and c11,c13 and c16 on highly boosted cars. > Andrew Smith > > mark krawczuk wrote: > > hi, does any body know the capacity of a 1600 fuel tank? has anybody > used any of those octane boosters? do they work? > mark.k > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > <http://www.ozdat.com/ozdatonline/index.htm> > http://www.ozdat.com/ozdatonline/listindex.html > <http://www.ozdat.com/ozdatonline/listindex.html> > http://www.mail-archive.com/[email protected]/ > <http://www.mail-archive.com/[email protected]/> > --------------------------------------------------------------------- > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > --------------------------------------------------------------------- > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
