Quote Originally Posted by mudski View Post
I can't see the advantage of having multiple spool up rates. Having a slower spool up that what its ideally set at will only cause higher etgs and poor performance.
And having faster could bring on limp mode.
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With ECU remap, best run Sweet Spot is Max Boost 21 psi with cruise boost of 18 psi (slight load at 100 km/hr). Any lower cruise boost, the performance is poor(laggy), With any increase of load above 45% (a slight incline) boost will run at 20psi. Provides for a good run. My main concern is when out on open roads and running high cruise boost and working the turbo at higher speeds for sustained time periods.

It is when I am out on open hwy or say on the Hay Plains (lazily cruising along), rather run a cruise boost of 13-14 psi (EGTs do remain OK). When EGTs start rising or require greater pwr response, the higher spool rate/cruise boost needle would be selected.

Have the needle in the cab and do adjust on the fly. When running lower cruise boost and when more spool is needed I just rapidly close needle. Fiddling with needle valve on the fly is unsafe and just guess work.

With the recent ECU remap, even doing long hauls with or without tow at full boost 20-21psi (max spool/needle fully closed), I do not experience limp at all these days.