T444E Boost PSI and a few other numbers

[Simplicity]

I bought a BlueFire. My 230hp, 190k mile, 33' flatnose, MT43 4 speed with 4.10 (originally 5.11) rear end does 60mph at 2050rpm.

My tranny electric modulator has proven challenging, yet we've road tested it with a toggle switch hooked up and when activated it downshifts and really pumps up the rpms.

Instead of using an limiting switch at the accelerator pedal, I added a tee to the MAP sensor port and then added a 15psi (14-24 adjustable) pressure switch to trip the modulator.

Unfortunately, when I took the bus out to test this setup, my BlueFire tells me my Boost goes up to a maximum of 15psi when manually shifted into 3rd, climbing a steep grade at 55mph and 2400rpm pedal to the floor.

Around town on the flat, with standard accelerator use, it shifts at about 8-10psi.

My plan is to get a different pressure switch and set it somewhere around 8-10psi, unless I hear something on here that changes my mind.

With rain and 49 degrees, my other numbers were:
Coolant - 195-210
Oil Temp - Rose up to 205 (seems high to me....)
Oil Pressure - 35-50+ depending on engine load
EGT - Around 500 - 700 around town, didn't check it climbing the grade as I was watching the RPMs and Boost.

My oil temp is the only one I'm really concerned about.

Around town with gentle accelerator use it runs and shifts great. On the freeway flat it runs great. When we manually activate the modulator it all works great. So, I'm not super worried, just checking in to see what you all think.

[cadillackid]

15 PSI is close.. I think the book has maximum boost at 17 on that engine.. I run a different turbo and push close to 23 but your turbo is the smaller one so it spools quicker for the higher amount of lower RPM fiuel given to the engine.. you might be able to adjust the wastegate a bit to gain more boost but unless your EGTs are running up or you are adding fuel, added boost only increases your backpressure and is wasted..



oil temp 205 is normal for a used engine.. I see mine hit that regularly when im climbing hills foot to the floor

[Simplicity]

Update & Solution: This is the thread I posted as to the solution to my tranny modulator problem. Hope this helps someone.

https://www.skoolie.net/forums/f33/s...tml#post436690

[cadillackid]

Originally Posted by Simplicity

Update & Solution: This is the thread I posted as to the solution to my tranny modulator problem. Hope this helps someone.

https://www.skoolie.net/forums/f33/s...tml#post436690

I plugged a tuner into my 444E, nailed pedal, everything flew off the dash and my boost PSI went up to near 29


I dont think it squealed the tires though

[Simplicity]

Originally Posted by cadillackid

I plugged a tuner into my 444E, nailed pedal, everything flew off the dash and my boost PSI went up to near 29


I dont think it squealed the tires though

Wow! What tuner??