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Yes you need a different regulator. Most commercial turbo and supercharger kits sold for other types of vehicles include a fuel management unit (interchangeable term with rising rate fuel pressure regulator) with a ratio of anywhere from about 4:1 on up to 15:1 depending on application. 6:1 should be adequate for a 5m-gte but I suggest you buy an adjustable one like the Cartech unit or the Vortech Super FMU so you can fine tune without changing pressure disks.

Phil D.
 

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At least on the Supras it is variable, but with engine vacuum. Fuel pressure increases from about 29psi at 22inHg to about 38psi at 10inHg. I don't know how that translates to a ratio but the effect doesn't continue into the boost range as far as I know it just stops rising when it hits 38.

Phil D.
 
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