Boost on a 1990?

[Smokey 01]

Put a boost gauge on the 1990 today and I was surprised to see 26 psi at peak boost. :--) This truck has an all stock turbo and a stock ve that I tweaked. Does this number seem too high? Also I do not have a pyrometer yet and does anyone think I might be pushing it without one?

Thanks for any replies.

 

[JLEONARD]

Sounds about right for a non I/C rig. Based on what I saw with mine, I'd say EGT should be no problem unless you are towing or hauling something heavy. Just make sure you let it idle for 15 seconds or so before shutdown

Jay

 

[KHeine]

I just installed a boost, tach, and pyro on my 89 non i/c. The most boost I can get out of it is 14lbs. Do I have a problem? (nothing else has been modified ie no pump adj. )

 

[bgilbert]

Check for boost leaks between turbo and intake. Intake cover bolts, grid heater bolts etc. Also fittings for boost gauge and at the gauge. When I was stock and non-intercooled I could hit 27psi as well. Also check to see if you are getting full throttle at the pump with the pedal on the floor in the cab.

 

[Chris and Sam]

boost pressure

I can only get a max of 14psi on mine as well. how do you check for boost leaks on a diesel?

 

[paccool]

14 psi was all I got when everything was stock. That seems sooooo long ago! :-laf

 

[BushWakr - RIP]

There are a couple things to keep in mind here Smokey 01.

Whether you have done any mods/tweaks or not, please believe me when I say that gauges are a must.

Ok, now then... at 26psi on a stock turbo you are the max boost value/range for that turbo... . basically what this means is you are running that thing at it's max designed spec (turbo).

Anything beyond that and you'll be generating very high temps on your boost air.

As the turbo goes beyond it's "map" the the air temps just start climing at a very fast rate... . so you need a pyro to check just what kind of temps your seeing when you run the turbo at it's max "efficiency map" (24-26psi)



bob...