[ykdave]

theirs not really much you can do with the stock turbo as far as 'free mods' go.

You can drill out the wastegate hole so that it vents all 6 cylinders and you can actually control boost when your moving alot of fuel

You can also clean up the turbine casting a bit to help flow

 

[ykdave]

i see yer point there man:thumbsup:

how about up gradin to a 24 valve turbo, one out of a manual tranny truck?

same turbo on the 24v vp trucks other than the autos which used an HY35, basically the same thing with an even crappier (smaller) turbine housing

 

[ykdave]

no no i didn't mean free turbo upgrades haha

i was actually referring to buying an upgraded turbo.

Their are HX35/40 hybrids available and they are somewhat reasonably priced compared to someof the other turbos on the market

really?

hell, we get the worst IP, and the worst turbo too?:S:

Gotta love emissions! 01-02 autos got the lovely hy35 9cm, the rest of them got the same ol hx35 12cm

 

[ykdave]

The wastegate flapper is on the back side of the turbo. The exhaust is diveded totally into 2 banks, cylinders 123/456. the wastegate only vents the rear bank of cylinders, thus, with alot of fuel the first bank of cylinders can easily overspeed the turbo.

Basically what you want to accomplish is venting both banks. You can either ram a drill bit down the wastegate hole and drill through the divider, or i have also seen guys grind the divider a bit between the manifold and turbo.

As for cleaning up the casting, its just that. same as doing a port+polish on a head, you want to get rid of any casting flaws and polish that sucker up so their is the least ammount of restriction and turbulence

 

[ykdave]

High Tech Turbo

You can buy the wheel and comp housing from them to 'DIY' or get one already done in various configs, but the center section does require some machining and the assembly should be balanced