Remove the intercooler piping that is just above the air box for easier access. Locate the EGC actuator (about the size of a soda can), on the lower, passenger side of the engine. Note: read entire procedure before starting (if you want to permanently wire your actuators open, you can skip down to that part now). Time required: 10 minutes (the temporary way), 1-2 hours (the permanent way). Parts Required: 2 one-way check valves (Toyota part number 90917-10049, about $5 each from Jay Marks Toyota), one foot of 1/8″ diameter vacuum hose, several feet of picture-hanging wire, flat-blade screwdriver. The lag is probably too much unless you have a downpipe (but you DO have a downpipe, right?!?) and a manual transmission. What are the drawbacks? Turbo lag is increased at low rpm. Notice how your exhaust note changes at 4000 rpm when your 2nd turbo kicks in? Well, after this mod, your exhaust will have a similar growl throughout the entire rpm range! The sound of the exhaust will increase.
Twin turbo sequential mod#
This mod seems to provide more high rpm power (my car now easily loses traction in 2nd gear). The power delivery is smoother, there is no boost dip at 4000 rpm like there is with the sequential setup.This mod supposedly eliminates blowing up the #2 turbo due to shaft twist when the complex sequential operation doesn’t work properly for some reason, especially when you are running higher boost than stock.What it does: converts the turbos from sequential operation (#1 turbo first, then #1 and #2 together), to parallel operation (both turbos spool up together at the same time).
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