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New boost gauge, what boost pressure should i have

Foehammer

Foehammer

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Hey Guys hows everybody doin' ?

Her is my question I just installed a boost gauge today prior to ordering a turbomaster (my truck black smokes when i press the accelerator hard) and I was curios asto what sort of boost i should be getting a different acceration levels eg.-accelerating from dead stop, cruising at 1600 rpm -that sort of thing thanks in advance
 
My 6.5 would spike to 12-14 when I would stab it, and level off at 7 unloaded(would hold right at 8 with a trailer in tow). Cruise with the 95 chip was 2-3 at 65, but the updated GM chip dropped that back to 1 or less which upped the milage almost 3MPG.
 
With a #9 resistor mine is around 15 psi (don't know for sure as gauge maxes out at 15) at 3/4 to full throttle. Cruising at 70 yields about 4 psi.
 
i dont have one, but test drove a few and if i find the right one for the right price i will! i have a 7.3 with an edge juice with attitude. other guys in my club with 6.0's and custom chips usually see about 35, and cummins guys are seein upwards to 80! :wow:
 
I've been meaning to ask this for awhile and maybe this is a good thread for it. Why exactly can't you run more than 14 or so PSI on a 6.5 safely ? Also what is the advantage of running lower compression to run 20+psi ?? I mean if you run 20+ PSI on a 6.5 what will happen ? Headgasket ? Too high IAT ? Can you fire ring or O ring a 6.5 ? I know Bill Heath is running twins, what's he running for PSI ?
 
At 21.3: you have roughly 400-450 pounds of compression in the cylinder. At 14.78 pounds of boost(one atmosphere) you basically double that pressure in theory. So when you start adding up the actual compression numbers after boost you can get some REALLY high numbers. Lower boost let's you put the same amount of air in with less pressure in the cylinder as there is more room.
 
Acesneights1 said:
Cummins stock runs about 25 WOT. The guys running 80 psi or what ever are usualy running fire rings and or o rings.
Click to expand...

Yea, one is fire ringed with studs, the other one has studs, no fire rings but he still blew the head gasket so fire rings are next. We have 2 other trucks pushin about 75PSI, with studs and no fire rings, and so far no boom, but we are waiting for it!
 
here is a very good explination i found on google, i wasnt 100% sure what they did to accomplish it, now i am!

Head studs
When upgrading your turbo, air pressure in the intake system typically increases and once this increase reaches 45-50 psi the factory head bolts start to stretch causing the head to "lift". When the head lifts too much the head gasket will fail and this failure will cost you.

Head studs are the ideal fix for those daily drivers trying to get more out of their truck O-rings. The next step up from head studs is O-ringing the engines cylinder head.

Head surfacing to ensure the surface is flat
An O-Ring groove is machined around each combustion chamber

With the heads installed the O-ring squeezes against a stock head gasket to hold the pressure in. An engine equipped with O-rings can contain boost pressures up to 70psi.Fire-rings For those who want the mother of all pressure containment then our fire-rings are for you. The machining process for the fire-rings is similar to that of the o-rings. The difference is how they seal. The fire-rings utilize a head gasket that is laser-cut to fit around them. The rings seal against the deck of the block instead of the gasket. These fire-rings and handle everything from your average tow rigs to a vicious sled puller. -
 
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