Holset Turbo Install FAQ, and Holset Info w/ Maps

Holset Turbo facebook page - by Holset wrote:

How to use the internal wastegate on HX30/HX35/HX40 'W' Holsets on a petrol car

This means you dont have to run an external wastegate if you wanted to save some cash/effort/complexity.

Its common knowledge that the internal wastegate setups on a lot of larger Holsets are no good for a petrol car, but they are much more commonly found as internal gate turbos. Most just block em off- but it turns out the mods to make em work well arent that much.

The wastegate arm/penny itself- It barely opens as standard, and this is the main problem. The reason it doesnt is it hits the 5bolt back plate of the turbine housing. Simply get a 10mm thick mild steel flange cut out using the template of the backplate, use 10mm longer bolts, and sandwitch the plate between the turbine housing and the backplate. This lets the wastegate open fully and give good flow.

Wastegate hole- Just port it, its not that big as standard, but not that small either. Either way, it can be ported out a fair few mm with a drill/dremel/etc really easily.

Actuator- Depends on the turbo and depends on the boost- Most are set too high for most cars (worth checking before you change it), but ones off other cars with actuators with a 2piece threaded arm bolt on pretty easy, standard thread and 2bolt fixing 99% of the time.

On divided housings the wastegate comes off only one side- Not much of a problem as 99% of people run them on non-divided manifolds, but simply drilling through the wastegate hole and through the divider works.

These days external wastegates are so cheap its no biggie to just block it off, but this deffo gives another option.

gardner86zx wrote: No it does not. I have an he351cw and the compressor wheel is bigger than an hx35