Increasing boost on 1HDT

The pump definitely was and I assume the injectors were. It was done prior to me purchasing.
No issues with it towing as such, just trying to improve it without affecting its reliability.

Well if you don't want to affect reliability then don't play withn the boost. just get it fueled right for optimum performance and watch those EGT'S. It is mazing the different readouts you get under different conditions. If you have put in a 3" system then it probably has provision for a pyro/egt guage.

Just looking at the Service Data file from Toyota for the 1HD-T and 1HDFTE the Turbocharging boosat pressures are as follows:

1HD-T: 5.4 to 7.0 psi

1HD-FTE: 7.0 to 9.8

That is a fair way short of 12 for both motors.
For durability I would not exceed the 1HD-FTE maximum boost pressure. The main durability issues will be valve faces [heat] and extra wear over time on the big end and piston bearings.

Bushtrek,the 1HDFTE runs 12 to 13 standard,i was at the 4WD show yesterday and a bloke at one stand said to wind it up to 14 to 15 PSI no worries!they have a 16psi boost shut down he says,has done several and says the difference is chalk and cheese,much better low down torque and greatly reduced lag.dont even up size the intercooler on the 100 series as it is a waste of money.cheers Paul

Both engines will handler higher boost ast TD100 has stated but the turbo on 1HD-T becomes unreliable above 13psi. Could fit an aftermarket turbo. I think Yanmar modifies these engines and gets heaps more out of them reliably, for marine use though.

TD100,
The figures quoted are correct. I should add that the maximum boost pressure on the 1HD-T is at 4,400 rpm and the 1HD-FTE is at 4,300 rpm.
If a new engine was presented to/inspected by Toyota Engineering with higher boost pressure then either the Actuator hose assembly would be checked for cracks and if cracked it would be replaced or the Turbocharger assembly would be replaced.

What you are talking about is the test pressure of the Actuator.
On the 1HD-T the test pressure is 92.7 kPa (13.4 psi) and on the 1HD-FTE it is 114 kPa (16.5 psi).
The actuator is there to protect the engine from overpressure, and running too lean, the fuel delivery system will not supply sufficient fuel at such high boost pressure to run the engine stoichiometrically.
That is not the same as saying the Turbocharger runs at 12 or 13 psi, it does not run at this pressure under standard conditions.
Cheers

Hey Bushtrek,
Seems like another show salesmean has confused the great unwashed.
I also got given the spiel about the turbo on my old 1hdt running at 15 spi. Had it checked and they found it was maxxed out at 6 but the dealer service manager wouldn't let them move it above 7 while it was still under warranty.
you sound like some yota engineer.