the stock fuel chip will hit 100% dutycycle pretty easy by 4000 rpm I got it to hit 100% by 3500rpm with a T3/60 add to that a rrfpr and you have a nasty wet spot at 3500-4000rpm and lean out from there if you were running an apropriatly sized injector
my advise is run 280 150 431 injectors and one of my chips and ditch the rrfpr... but if your rrfpr is adjustable you can turn up the pressure with your injectors and maybe not kill another engine .... the problem with running small injectors at really high pressure is that you cause the pump to run low volume high pressure ...you want to run a C900 pretty rich at full boost because of the horrible timing control so 10.5-11.0:1 is good.... your timing best setup will be like 9 or 10*BTDC which is way too advanced for over 15PSI ....if you try to retard it any further to get good full boost timing it will run horribly everywhere else because it wont be advanced enough....
if you look back on what I and others have written its all there everything you need to know is in the archives
good luck to you and have a great week
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