First, let me mention that I have a Quadzilla Commander monitor and I know electronics are not really popular here but that is where these boost readings come from.

O.K. I have a question:

What should my boost run stock and with a Supertuner Max Microtuner on either tow safe or tow perf.?
Mine runs about 13-15psi at WOT stock and I didn't see it above about 17 (might have hit 18) even on tow perf at WOT (I didn't get crazy with it). It runs about 7-9 psi at 75-80 mph on the highway with a trailer about 6k lbs.
My truck is an 03 6 speed, has about 75k miles, and is relatively stock (other than the tuner, a K & N FIPK intake (only been on for about 2-3k miles so I don't think the wheel is dusted- but I am thinking of changing it), and muffler delete with split pipes from resonator back.
Is that boost a bit low or is that about right? I had the stealership check it a while back as I thought the fuel mileage was low (10-12mpg most of the time) and they said they felt the boost was a bit higher than normal and that may be affecting the mileage. They didn't say what it was running at that time and I told them not to change anything as I didn't want to lose any power.

I have not done the CCV mod yet so could my intercooler be oiled up or something like that? When I put the intake on the wheel looked O.K. from what I could see but I didn't really look extremely close. Should I check the MAP sensor? Check the turbo again?

I'm thinking of adding a DP Tuner and 4" exhaust, but I wondered if I need to look into this further first.

Thanks for your time and sorry for the book
John
2003 cc 4x4 dually, Quadzilla Commander Monitor, K & N FIPK intake, Superchips Max Microtuner, Muffler delete with dual tailpipes, RDS 91 gallon transfer tank/toolbox combo,
Future mods- DP Tuner, 4" turbo back pipe, airbags for rear, ccv mod, maybe zoodad

 

Those boost numbers look about stock I would expect a little higher with a tuner. With the DP I can hit 25 easy without going to full WOT on hard acceleration. Before the tuner that is about what I was seeing

 

I would bet you have a boost leak somewhere. You should be seeing about 20-22 with the ST tuner. No need to change your K+N filter kit. There is nothing wrong with there "kits" just there drop ins.

Check all your turbo boots, Y pipe ones to the IC and back. Also look at the up pipes where they feed the turbo, see if there is any soot (leaks) there.

 

Thanks guys,
I'll check a few things this weekend and post a reply. I have not really checked anything yet, because I just installed the Quad last weekend and noticed the boost. It's not a daily driver so I haven't gotten into it yet.

Thanks again,
John