I built my own TM for my truck. I can adjust for pretty much however much boost I want. What I want to know is how it stacks up. If I were to buy a Heath, am I really going to see much differance. Don't get me wrong, I not claiming to have a better one. I just want to know if my under engineered unit is even comparible to an engineered piece.


So here it is.......
At about half throttle I'm getting between 10-12 PSI. Beyond half on quick acceleration I can reach upwards of 15-16 PSI. 1/3 throttle(just normal driving from a light) I see about 5 PSI. Normal cruising it hovers at about 2-3 PSI.


My plan is to put a Heath prom in and I want to know if my unit will work with it. Some input would be great from those who have done both.

Your fine,, it will work just the same as yours, although If I were you I'd back the nut off about 1 turn, and only peak at about 13-14, Or more if you want better fuel mileage. If your not towing or having to work the truck hard for any Reason, all that boost is just wasting fuel. Do you have any other mods? like exhaust? Welcome to the site. Please fill in your sig, So we know what mod's you do have, to help you in the future with any issues.

It's a pretty simple set-up, so I'm sure your TM will be just fine. The numbers looks like it's working. However, I would also say back it off just a bit (unless you have an intercooler?). But, before you do that, check what your MAX, SUSTAINED BOOST is. This is the most important number. The "spiking" doesn't really mean much. You should be in direct (3rd gear), with the converter locked and the pedal mashed to the floor. You'll want to limit your max sustained to about 10 psi (w/o intercooler).

At about half throttle I'm getting between 10-12 PSI. Beyond half on quick acceleration I can reach upwards of 15-16 PSI. 1/3 throttle(just normal driving from a light) I see about 5 PSI. Normal cruising it hovers at about 2-3 PSI.

I have a Heath TM. I have the same 2-3 at fast cruise, less at say 55 mph. Half throttle I'm more like 6-7 psi. As long as you have a spring with enough adjustment you'll work as well as a Heath with your setup.

...So here it is.......
At about half throttle I'm getting between 10-12 PSI. Beyond half on quick acceleration I can reach upwards of 15-16 PSI. 1/3 throttle(just normal driving from a light) I see about 5 PSI. Normal cruising it hovers at about 2-3 PSI...

You will want to turn your T/M down quite a bit. You will want to set it to about 9 PSI during sustained WOT. The OBDI (94 and 95) trucks are more sensitive to overboost limp mode than the later OBDII trucks. You may not be pulling that boost for long enough at the "right" RPM range, but when you do you will know it. The limp mode can be cleared by cycling the key. And unless your running and I/C, the IAT sensor will also throw you into limp mode and will give you even more trouble with it (limp mode) in the summer months.

Once you get the Heath prom, none of this will be an issue but because of the higher fuel rates you will likely wind up with even more boost for the same exhaust backpressure (T/M setting)...

Regards,

WOW - At 15-16 psi you're flirting with new head gaskets or worse.

Thanks for the Input guys. I'll do some adjusting on the way home from work. I filled in my sig but I don't know if I did it right.

Nope It worked.

Hey, welcome to the DP man! Always nice to have another 6.5'er around.

So I backed it off today. It now spikes to 13-14 PSI and then drops to 11-12 PSI at WOT and stays there. Does that sound like a better number?

Better, but personally, I'd turn it down some more... if you don't have a chip in yours, you aren't pushing enough fuel to need that much boost, and what you want is to run just enough boost, not too much.

You'll get better fuel mileage, the engine will be less stressed, etc. with it turned down some.

If you see black smoke of notice low power, then you got it down too far.

If you see black smoke of notice low power, then you got it down too far.

Just to help clarify more -- you should really only see a puff of black smoke when you first hit the go pedal (hard), it should clear up very quickly. Other than that, you'll probably only notice a gray haze at night, when you're looking in your passenger-side side view mirror with a car's headlights behind you.

For future reference, lot's of black smoke (and low power as mentioned above) is usually the first indicator of something being wrong with the turbo system. Of course, you would see little to no boost on your gauge, also. Most of the time the problem will be either a failing wastegate solenoid or the vac lines/vac pump.

Sounds like you know what's what around a truck, so forgive me if I'm telling you things you already know. Also, see post #3 about how to verify max boost. That's the most reliable and valid way to check - you'll probably be turning somewhere in the neighborhood of 2500 - 2800 rpm's.