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Hks To4s Question

old mate

By old mate,
in Engines & Forced Induction

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old mate Collaborator

old mate

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hey guys. i have a rb25det s1 going into a cefiro. i want roughly 400hp.

now the questiion. im getting a hks to4s turbo with a .73 (roughly that size rear) turbo and i want to know if this is capable of 400hp at the wheels. i know the turbo is old but it has just been rebuilt and its the right price. i originally bought a garret gt3082r with a .63 rear for my rb20 but decided not to whip a dead horse. i read that this turbo has compressor surge issues on rb25s????

anyway if some one could throw some knowledge my way i will be cheering.

Steve.

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old mate Collaborator

old mate

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yeah i know its not the very best option out there in terms of response but aslong as it gets going at a reasonable enough rpm i will be happy, aslong as it gets to the power level im roughly chasing. thanks for your reply dude.

discopotato03 Grand Master

discopotato03

Posted
Posted

From memory HKS T04S turbos were full T04's meaning they used a T4 turbine as well . T4 turbines were generally available in three trims N/O/P with the O and P trims (I think 69 and 76 trims) more common . The unique bit with HKS T04E's and S's was the turbine housing being "T3" flange and usually a smaller AR ratio .

As was mentioned these will not be real responsive because the turbines are heavy and the bush bearing center section not as free spinning as a BB cartridge . GT30 BB series turbos like the GT3076R are more modern evolutions of the older T series turbos .

A .

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