I think the H2 does not have vacuum modulation. It is electronically controlled. That is the reason I will be going to vacuum modulation to still get the benefit of higher line pressure but, smoother shift.
The vacuum makes the shift a little smoother rather than a bang when it shifts like it does if You have tuning running at firm shift.
If You play with line pressure try to keep it at low 200 PSI. Stock runs 175 PSI. You can do seriuos damage if You get line pressure to high say 250 PSI & up. You will loose the benefit of removing torque to make tranny last longer.
You will burn bands up by making them hold longer than what You really need. Same problem if you run HP on the 175 the tranny is going to slowly slip into next gear because of to low line pressure and it just slips and burns the bands. So You have to be careful on both ends of the scale and use a happy medium and the research i have done says stay in the low 200's PSI. This way You get the best of both.
It is not just throw all the line pressure You can as it will die on You at some point and You would most likely have gotten longer usage havng it in the stock pressure.
TAZ
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05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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