Still trying to get my truck in good running shape.
When I nail the gas the boost climbs to 10 then immediately drops to 5psi and stays right around there until I release the pedal. Boost stays at 2psi at 50mph, but jumps up around five if i accelarate.
Previously I was assuming low vaccuum to the WG, and I believe this agrees with that assumption.
Where should the boost hold on a stock truck at WOT?
Any one know what they run without any mods?
Thanks again.

That sounds about right for stock programming. Before the Kennedy chip I could bounce to maybe 12 psi and would run around 5-6. Now I can bang the needle off the stop and hold 12 as long as I want...

Sounds like mine before all the mods. Check the vacuum to the WG. Should be around 25 I believe. I did this and realized that my WG solenoid needed to be replaced (after I replaced the vacuum lines). Then I added the exhaust and 10k pot.

man, at 50 MPH, I am boosting about 9-12, depending if I am pulling a load.;)

I just installes my gauges this weekend and my numbers are almost the same. I don't think they are off but I maybe wrong That is just how the turbo runs with no other mods from what I have read in other posts regarding stock boost levels. I have JK's TD Max Boost controller waiting to be installed!!!! :ro) I bought a previously owned one for $15. I have to finish wiring up the EGT gauge before I do that though.

I had figured I would need to make a TM. but since my exhaust is stock and I don't need to go crazy with this truck, I was wondering if i could just add a spring to the WG to pick up a few more pounds of boost. I figure my truck could handle about 7-8lbs without problems, could I achieve this with the addition of the right spring?
Thanks again.

I add a spring to the wastegate valve to up the boost just a shade on stock trucks. Works pretty good with little time to install. Your pressure figures are perfect for a stock truck. Your not looking to make boost at cruising speed. Matter of fact less would be preferred.

I add a spring to the wastegate valve to up the boost just a shade on stock trucks. Works pretty good with little time to install. Your pressure figures are perfect for a stock truck. Your not looking to make boost at cruising speed. Matter of fact less would be preferred.

Huh? Could you please elaborate on this? You leave the stock wastegate solenoid (can) in place and add a spring somehow? If you dont mind do tell! :)

man, at 50 MPH, I am boosting about 9-12, depending if I am pulling a load.;)

However yours is lower compression and intercooled. I'm sure you've got your boost cranked up and that's to be expected. I'm guessing his is a stock setup.

SnowDrift

However yours is lower compression and intercooled. I'm sure you've got your boost cranked up and that's to be expected. I'm guessing his is a stock setup.

SnowDrift

He's just showing off, Snowdrift.;)

You see his video?

Ya and it was waaaaay:cool2:

I remember when a burnout didn't involve having the left foot on the brake and if your motor and trans were strong enough, you could see where you shifted, but alas, I am a relic these days!:lol:

Your not looking to make boost at cruising speed. Matter of fact less would be preferred.
Could you explain this to me?
Both before the installation of my TM and after, my truck cruises at 65mph or so with 5-6psi. Why is this not desireable?
In stock form, boost would drop to 0 around 70-75mph. I didn't like that, because it stayed at 0 even under load. Now it makes close to 10 by 75mph.

I takes work to create boost. Why spend the energy to make boost that you don't need (no load flat cruising)? The EFI guys that are writing economy tunes are doing just this, dropping boost at cruising speeds.

Something along those lines...

That makes sense.
So why does the PCM allow boost at 65mph, but none at 75mph? And why doesn't it command boost under load then(uphill)? I found the PCM would cut boost at the times I needed it most. Seems kinda ghey...

I think you see that as the non-intercooled truck's self-defense against self destruction. Compressed air gets hot, add more fuel and you generate more heat, vicious circle.....

Seems to me they should have just left it NA then.

So correct me if I'm wrong.....at highway speeds (70) with a load, I want less boost? Will that help increase fuel economy?

Best economy is going to come from having the right amount of fuel with just enough of the coolest (densest) air you can burn it with.