ok, so I AM IN NO WAY TRASHING ANYONE OR ANY PRODUCTS BUT I NEED TO TELL WHAT HAPPENED.
this is on my 2000 Tacoma 4x4
So, in october i installed the TRD supercharger but did not have the URD kit yet. I had regular multi ground plugs in, was using like 2 of those NOS brand fuel additives every other fill ups to suppliment the octane,,, still used 91 octane though.
the supercharger has a 2.1" pulley... so i think thats like 14psi right...?
K&N intake, gibson exhaust.
I was getting the same gas milage as before... like 18mpg, and was ok on ping unless i tried to get on it.
I got some 2 step colder iridium plugs to help out in the mean time while deciding what fuel mod to do. ngk bkr7eix
Gadget gave me an awesome deal on the 7th injector kit and told me to get rid of the k&n. I did like he said, installed the 7th injector kit and started noticing some issues:
-buzzing during certain rpm ranges (2200-2750) from the pcu
-ping in mid rang rpm in 4th and 5th and some times 2nd and 3rd
-fuel milage dropped by almost 30% (usually was getting like 75 miles to a 1/4 tank and went to between 55-60, mpg approx due to tire size and lift)
-humming sound from fuel pump
-felt kinda like the power wanted to be there but was being held back, rough feeling
did a new f.f. and rechecked install, talked to Gadget as much as i could since he was insanely busy with his other projects. we figured out the buzzing issue, and it helped the ping a lot as well, but still felt like a caged tiger and mpg was still horrible.
Asked Gadget if the plugs could be the issue since lots of ppl say that you should only run the dual ground plugs, he said it was not the cause and that all the dual grounds do is lengthen the life since our trucks fire twice each rotation or something like that
I recently finally found some multi ground plugs that were 1 step colder, denso K20TR11 since NGK doesnt make any that are available anymore and no one make a 7 heat range dual ground
Installed yesterday AND OMG!!!!!!!!!!!!!!!! immediatly felt difference!!!!
idle was WAY smoother, engine was quieter, throttle response is amazing, acceleration is amazing!!!!!, still got ping in 5th gear mid rpm range, but I have yet to tune the URD kit, so that may have some to do with it.
will be testing mpg this week but already have a great outlook since it is running way better.
So.... I ask.... who has a TRD SC with the URD 7th injector kit and Iridium plugs??? are they working ok??? Any issues you have???? mpg???
next i want to get the TRD low temp thermostat.