Originally Posted by
Sweet2002
Jim, from all of the posting and research I have done it seems that the SC should not spin more than 15,000rpm. So since I have a 178 to put on a 70mm crank pulley would be perfect. That would be about a 5 percent increase over the 155/65. I have seen 18/19 psi with my current set-up with E/C data logging.
maybe I would not need larger injectors with the 70 also. I don't understand how running 550cc inj's would run at a 14.x:1 under normal driving. Would the ECU adjust trims to get to the right AFR's and how long would it take. The fellow I got the pulleys from said he never got his running running with correct AFR's, always rich normal driving.
I'll look into a 70mm pulley now. Thanks guys for bearing with all of the questions, just want to get it right the first time. Mark
That would be a good setup and you do not need bigger injectors but the larger pump and adjustable regulator will be a necessity. The ECU will make adjustments within a few short drives, ours is a very complicated and smart ECU. I am at the safe limit with the 181 and 70 mm SC pulleys and WOT see close to 22 psi boost, however, I do not do this routinely.