Sounds like you need some sort of fuel controller, or to install a boost controller and turn down the boost. You can do the Lexus AFM and 550's to trick the computer, but that's not an exact science. Your best bet is a fuel controller, as this will give you much more fine tuning and will yield greater (and SAFER) power potential. In another thread cre recommended to another member the Apex'i SAFC-II, Neo (it's successor), MAFT Pro, or you could go standalone EMS. I'd say do some research on the different systems and find one that meets your goals.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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