Hks To4s Question

[old mate]

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.

[Cjmartz2k]

Compressor is capable of 400rwhp, but I'm not sure about that rear end. Might have to get the boost up there pretty high to reach that.

[old mate]

well i can also get a .8# rear housing aswell but i want to retain response as i do alot of short track stuff.

Thanks for your reply aswell.

[R31Nismoid]

If you are using a T04S and are after response... you don't have the right turbo.

T04S's aren't exactly the pinnacle of response

You should do it with a .73 though.

[old mate]

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]

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 .

[old mate]

nice reply, cheers.