550cc Injector install on Mr2

[91turbo2]

hey guys, i got my 550cc injectors off a 98 supra tt, just wondering how long the install takes, and how hard it is? Plus any suggestions on why my car starting pinging lightly at high rpm at 16psi and above, i got an intercooler, but i recently got a 46trim upgrade compressor wheel, and i bought a new knock sensor cuz my went bad. Plus i have a fuel controller hks safr so it should work perfectly with the 550's... Plus my spark plugs are black as hell, so it is running rich but i think it leans out at high rpm because of the turbo.

[OEMonkey]

make sure you relieve fuel pressure before taking anything out. use new orings for the injectors and new gaskets for the union bolt.
high temps will cause pinging so quit leaning it out with your safr. you are not running rich(ask your old ksensor). run higher octane and do not advance your base timing.

[91turbo2]

well i'm not leaning the fuel controller out, i actually riched it up to around 25% rich, and yea my knock sensor broke because i had leaned it out before, but now its rich. And yes i have to relieve the fuel pressure before taking them off, but base timing i havent touched, which gives me a good question, which way does the distributer turn to retard timing? i think if i retard base timing a bit ill have no chance of detonating...