Engine/Transmission (1994 - 1998) will more boost help me?

[DSutton]

I have been through the forums studying the idea that a little more boost may help me with EGT's. Is there anyone with a similar setup who has played with boost, with a goal of lowering EGT's??



2nd question is the TST boost elbow has a allen head screw in it that I would guess is to allow for boost adjustment, is it?



My max boost is 27, maybe 28 lbs. When pulling 7-9K (Total 16-18K) EGT's get me before I run out of power. I may swap out the turbo housing if I have to, but would like to see if there is a free fix

 

[TomGolden]

Well, first, yes, the allen head screw in the boost elbow is to adjust the elbow, to allow more or less boost. If I recall correctly, if you tighten the set screw, you will get more boost... I think...



Also, generally more boost does help with EGTs. But it is a fine line. For example, if you simply swap out the exhaust housing on the same turbo, your EGTs will drop a bit, but now you have [more] lag on turbo spool up, which can lead to higher EGTs at first until the boost comes up, but on the top end, the EGTs will be a bit lower. If you went with a larger turbo (say an HX35 to an HX40), now you are moving more air, and that or course lowers EGTs. But, typically, a larger turbo is likely to have a larger exhaust housing, which as I said, leads to increased turbo lag. Unless you go with one of the modified turbos, like one from Piers or KwikKurt.



Hopefully I haven't made any glaringly wrong statements...



Tom

 

[Strick-9]

Don't feel bad, we all run out of EGT room before we run out of power.



I'd try adjusting it for about 32-33 psi.



If you're still having EGT issues and want to be rid of them for free, slide your plate back about . 020 at a time.



Although not free, advancing your timing or a 16 cm exhaust housing will give you a little lower EGT without much expense. (<$200>



Another free tip: Make sure you check for ANY boost leaks. Devise a way to pressurize your intake to 10-15 psi. Then spray soapy water on all the rubber boots to check for leaks. Check the gaskets on top of and below the grid heater as well as on the long rectangular intake plate that bolts to the head. Those are common places for boost leaks to show up on old trucks like ours.



Hope that helps,

Chris

 

[vssman]

I'm running into the same issue right now. I was running 32PSI and had very high EGT's. Turned the screw in and EGT's are gone. Try running at 38PSI if you have the fuel for it. It should take quite a bit of effort to turn the screw as it's loctited in place.

 

[DSutton]

Thanks for the input.



How much boost is safe to run?





I adjusted the elbow in one full turn, and boost came up to 30, 30. 5. I turned it in one more turn and am getting 33 lbs now. I think I will leave it here until I get a chance to pull with it and check the EGT's.

 

[vssman]

Originally posted by DSutton





How much boost is safe to run?

That's like asking who makes the best transmission. Marine engines run in the upper 30's. Your stock turbo is efficient up to 38 psi. Above that and your adding heat to the air. A number of guys run in the low-mid 40's. Personally, I'd stop around 40 psi. Of course, this is based on having enough fuel to run with that boost.



Just my $0. 02

 

[DSutton]

Another Ignorant question

How do I know if I have enough fuel?

 

[Berrigan]

So are you guys saying on my truck (see sig) and Im cuurently running 32 psi max boost that if I turn up the elbow screw to 37-38 psi I will see a drop in egt?



And second question HP will not change because no more fuel is being added?



And last question how much would the egt drop?



Thanks Bill

 

[vssman]

I'm no expert... But had a similar experience. My EGT's were high due to too much fuel. I had really thick black smoke at full throttle. Increasing boost cleared it up and dropped the EGT's. I used to be able to peg the gauge. Now 1300 is about as high as it will go. I'd just try increasing boost a couple of pounds at a time until you get to 38+/- psi. Above that you should start to see an increase in EGT's due to the heat being generated by the compression of air in the turbo. My truck was running 32 psi before I turned the boost up.

 

[1dslram]

The HX-35 goes off its map at 35# any more than that is taking a chance, I got away with it but some others didn't.

Bruce

 

[wcjp]

Couldn't he help EGT's by adjusting the AFC housing for less smoke?

 

[DSutton]

Couldn't he help EGT's by adjusting the AFC housing for less smoke?

I dont have nay smoke during normal driving. The only smoke I get is sitting still and stomping on it. Because of this I wonder if the increased boost will help? I will let ya know.



Thanks for all the thoughts!!! :--) :--)

 

[jburnes]

Boost from Allen Screw?

I am unaware of this allen screw which provides an adjustment in boost. I have a Banks Stinger Plus system and am not sure if it has one of these screws for adjustment. Does only the PDR HX's have them? Tell me what you know. Help! (30 PSI loaded with some smoke)





'96 2500 4X4 Auto Banks Stinger+, BHAF AFE, 4"t-back Rip Rook Exhaust, 3K kit, 16 Degree pump timing, KDP Tabbed, transmission done, remote transmission cooler w/ 180 temp fan

 

[JKouzez]

its not the actual turbo that has the adjustment its a little gold elbow you get in a tst power kit you can also buy them seperatly for like 25 or so dollars. try adjusting the afc star wheel for less smoke and if you really want more boost (this is not really highly recomended but you will get mixed opinions) block off the wastegate.

 

[Bob4x4]

jburnes

Banks does not use that fitting. They install and adjust their own design wastegate actuator. It is adjustable to allow more boost.



Bob

 

[JGheen]

Originally posted by Bob4x4

jburnes

Banks does not use that fitting. They install and adjust their own design wastegate actuator. It is adjustable to allow more boost.



Bob

How is it adjustable?

 

[Bob4x4]

Adjust the length of the rod,use an adjustable pressure regulated air source applied to the actuator and you will see how it works ,adjust accordingly



Bob

 

[Dan_69GTX]

Originally posted by JKouzez

its not the actual turbo that has the adjustment its a little gold elbow you get in a tst power kit you can also buy them seperatly for like 25 or so dollars. try adjusting the afc star wheel for less smoke and if you really want more boost (this is not really highly recomended but you will get mixed opinions) block off the wastegate.

Where can you buy these? I thought they were just available if you bought the plate kit.



Dan

 

[Cooker]

Originally posted by JKouzez

try adjusting the afc star wheel for less smoke

The AFC will only help control low end, pre-boost fuel. If you want to minimize your WOT smoke the AFC adjustment will not help with this.

 

[JGheen]

Originally posted by Bob4x4

Adjust the length of the rod,use an adjustable pressure regulated air source applied to the actuator and you will see how it works ,adjust accordingly



Bob

Do you have a pick of what you are saying to adjust? I think I know what you are talking about but an illustration would help me better. I have the adjustable air source, so do I just take off the actuator line, put the air to it and what do I adjust and how?