No more than 10psi, any suggestions? [Archive] - Diesel Place : Chevrolet and GMC Diesel Truck Forums

: No more than 10psi, any suggestions?


dkubek
04-07-2005, 12:49 AM
I have the turbo master and have tried tweaking it around. No matter what I set it at, I cannot get the boost over 10-11psi. Any suggestions? Thanks.

Dan

whatnot
04-07-2005, 01:28 AM
If you back it all the way out do you get and black smoke out of the exhaust?
How many miles are on the IP and injectors?

gmctd
04-07-2005, 07:13 AM
Iirc, that controller comes with two springs, one for low and one for high Boost ranges..........

The turbo functions on exhaust energy - heat, volume, and velocity.

Engine rpm and loading determines exhaust energy.

The lighter the loading, the less energy available - 1500 and 2500 series will Boost less than a 3500, because of vehicle weight.

But, load any one of them with a heavy trailer, or such - loading creates high energy exhaust - and you'l see greater low rpm Boost levels.

Higher crankshaft rpm also creates higher exhaust energy, loaded or not - greater loading means greater hi-rpm energy, here, also.

My ole 8500lb bud draft horse spools up almost off-idle, because I leave the aux trans in o\d, resulting in 3.00 final drive - this high loading creates greater exhaust energy at low rpm because EGT is higher.

Wanna see quick spool?

Wanna see greater Boost?

Leave the trans in 5th at 30mph, stab the go-pedal - mine is at 20psi Boost by 35mph, remaining so up to whenever I let off.

Exhaust energy, thru loading, is the name of the game, folks................

Billman
04-07-2005, 07:37 AM
Do you enjoy repeating yourself, JD?

D.Camilleri
04-07-2005, 12:01 PM
What is your egt? Maybe it is time to tweak that 4911 pump for some more fuel. More fuel = more engery ie more boost unless you are peaking the boost and it is falling off.:eek:

dkubek
04-07-2005, 12:11 PM
What is your egt? Maybe it is time to tweak that 4911 pump for some more fuel. More fuel = more engery ie more boost unless you are peaking the boost and it is falling off.:eek:
Egt is normal. I have not yet done anything to increase fuel flow yet, but will soon once time permits. But don't you think I should still be able to go higher than 10psi?

It only came with one spring too!

dkubek
04-07-2005, 12:15 PM
If you back it all the way out do you get and black smoke out of the exhaust?
How many miles are on the IP and injectors?
Yes to the smoke. The IP is the original i believe and the injectors as well, but they have been individually cleaned a few times.

gmctd
04-07-2005, 04:57 PM
Only if I didn't understand it the first time....................