Tomorrow is the big day to VGT turbo or not

I think maybe a good tuner could modify the VGT files so the VGT would be open at idle instead of closed and making the hissing sound.
The closed condition of the VGT at idle was designed to increase back pressure at idle for better egr exhaust flow.
You would think that tuners who turn off EGRs would just write a file opening the VGT at idle being idle back pressure would no longer be needed.

 

If I could go back on mine

I would buy the 12.7 manifold and turbo

I replaced the turbo last year around August.
November my manifold cracked.
Jan new turbo blew. Warranty covered it

This is why I’d do a 12.7

You can tune it to more than 515 and 1850
Mine is a true 515 and 1850 before the tune it was a 425 and 1550
Now it pulls like a brand new truck
But if I knew the manifold was going to crack I would have done a 12.7 turbo, manifold and valve cover from a 99 and tuned it to a 600 and 2050 and would have been pre eld after the egr delete

 

Hmm. What to do.
Hissing I hate, but pulling 140,000 lbs I need strong Jake's.
Isn't there a way to have both a strong Jake and no hissing?
Id also like to put straight pipes, 7" or 8".
But it will most likely cause hissing to be worse.

 

Like hull said. You could get open vien idle program into the tune. Theres no reason to have the veins closed off at idle with deleted.. ask your tuner if they can write that into the program

 

I know nobody who tunes, but will start looking.
Thanks

 

P.S...
Is that with a full egr delete?
Or ....?
Last time I had a Detroit was in 1981. In a Astro cab over
Been a while
Been ridin cats for 38 years.
I'm in need of new school refresher course I think

 

The answer to your first question is yes.
Also the Detroit you sit behind now is light years of difference from the Detroit you sat over in 1981.
Although I have never asked, a good tuner should be able to modify VGT idle files to get rid of the hiss at idle.

 

2nd truck...? Or did the cat grenade

 

Nope, still alive,well and now running tip top.
Did u see my last post on that blog ?
I fixed my 31 month / $28,000 + problem.
It was unbelievable what it was.
Like heating to a glow a teaspoon, sliding it inside the fuel return line at the top.
Only high volume fuel flow caused it to fold downwards, blocking fuel from leaving the head. Blowing by mouth, zero restriction found in that line.
Fuel temp sensor before the head sensed, let's say, 100 degree fuel.
So it told the ECM that the fuel was 100 degrees. Two feet further the fuel temp was actually 200 degrees in the head, huge different information.
Cat, Peterbilt, 2 local shops all couldn't find why my engine buckled so hard it tore out 2 trannys, 4 rear main seals+++.
Cat threw in the towel and did a complete rebuild in November last year, under the guidance of cat engineers Toronto, put it together, checked fuel flow ,air, changed ECM + files within.
Then drove it, it bucked horrifically the same.
Then, I had an epiphany !!
I laser scoped fuel pre and post head on my and 2 identical trucks / cats.
And scoped my return line, yet again, deeper.
Change return line, inch by inch dissecting old line, and there it was

 

So now I had a beautiful Pete, 6NZ freshly rebuilt yet again, new tranny, new black paint, 2 new diffs, all sensors, harnesses, frame blasted and painted. Interior spotless, and a new $14,000.00 BOSE RIDE seat.
And running absolutely perfect.
So I sold it.
In the end, too many lose sight of the main objective ( or at least it is to me).
Taking care of the family, living a good life as a good person , retiring ASAP debt free.
To me it's not about having a 379 Pete., I dont care if I drove a 10 wheeled garbage can if the total operational expenses , fuel included, stayed at or under 32 % of gross generated revenue.
In my 39 years trucking, one thing us older seasoned brokers know, PETERBILT & CAT, = A rich mans truck, as operational expenses are much higher because parts and labor are much higher, as is fuel usage per 1000 miles.
I loved my Pete, more so now that it ran great. But fact is fact, and I needed to reduce my operational expenditures by another 3 % ,so I sold the old beauty