JusMX141
Moderator
- 15,148
- 1,268
- Dec 13, 2005
-
Greensburg,
Pennsylvania
Anyone who's attempted to achieve more than 22-25psi on an internally-gated turbo knows this can be an extremely difficult task- especially on MHI turbos, and turbos with upgraded (larger) wastegate flappers. I've found a simple and cost-effective actuator which takes the guesswork out of buying a stronger actuator....use an actuator from a Holset HX35 or HX40 turbo. The internal spring is so strong the actuator practically cannot be pulled out on it's own.
I got the idea recently when a buddy of mine absolutely couldn't get over 22psi out of the Garrett actuator and 34mm flapper combo on his SBR G60. The Holset actuator has the same two-screw mounting system as the Garrett, so it literally bolted right into his Garrett actuator mount. The rest was as simple as some bending / cutting / drilling to get everything to line up, and his first run out he made 28psi before we did a little fine-tuning with the actuator adjustment and MBC to acheive his final desired boost level of 25psi.
I'm in the process of building one of these to fit the 18G that is going on my FWD, as I'm shooting for a target boost level of 28-30psi with a 34mm flapper. When I get the finished product, I'll post back here with pics as well as step-by-step instruction on how it was done. It will take a little welding to make the Holset actuator work properly on a MHI turbo.
I got the idea recently when a buddy of mine absolutely couldn't get over 22psi out of the Garrett actuator and 34mm flapper combo on his SBR G60. The Holset actuator has the same two-screw mounting system as the Garrett, so it literally bolted right into his Garrett actuator mount. The rest was as simple as some bending / cutting / drilling to get everything to line up, and his first run out he made 28psi before we did a little fine-tuning with the actuator adjustment and MBC to acheive his final desired boost level of 25psi.
I'm in the process of building one of these to fit the 18G that is going on my FWD, as I'm shooting for a target boost level of 28-30psi with a 34mm flapper. When I get the finished product, I'll post back here with pics as well as step-by-step instruction on how it was done. It will take a little welding to make the Holset actuator work properly on a MHI turbo.