Would this work ?
Bear in mind I have not looked under the hood as of today, to see if this can be done.

I have a thought about a small alteration to the Wategate on my 02 Duramax. :rolleyes:

Can a light weight spring be attached to the wastegate to increase the spring pressure thus increasing boost a few pounds. I have increased smoke with the Lift Pumps so I must be flowing a little more fuel. I need more air now. Right ?

I suppose you could rig a spring to work on the actuator rod but a simple bleed orfice in the WG line would be more controlable IMO and acomplish the same thing. What kinda boost you swinging? There are many ways to fool the wastegate or alter its function. Or you can put a new WG actaator deal on it like the big head

Get a SD manifold or tap the intake manifold and pull the WG signal post CAC instead of from the turbo and you will see the extra boost that you are looking for. Plus you will still maintain the safety of having the WG work properly. I easily see 30-32 lbs of boost with this method and my setup.

Would this work ?
Bear in mind I have not looked under the hood as of today, to see if this can be done.

I have a thought about a small alteration to the Wategate on my 02 Duramax. :rolleyes:

Can a light weight spring be attached to the wastegate to increase the spring pressure thus increasing boost a few pounds. I have increased smoke with the Lift Pumps so I must be flowing a little more fuel. I need more air now. Right ?
I did the big head on my 03' and the added boost is very noticeable. Banks has the boost dialed in to approx. 25psi. on real long hills such as just north of bishop on the 395 here n socal i turn the banks back to stock and the truck still pulls real hard with just the wastegate upgrade. spend the $$$$ its only a couple hundred

you will only pick up a pound or to moving the line post IC

you will only pick up a pound or to moving the line post IC

Contrer monfrer, try 6-8 pounds. I went from 22-24lbs to 30-32+. If I get time this weekend I will hook up stock again and pull figures. I can still hear the WG opening at 28lbs but it doesn't stop the boost rise at that point.

:think: I definatly didnt pick up that.

Not meaning to flame or get into an argument but how do you think this is possible? You only lose a pound or 2 through the IC(that I have seen) so the WG is only thinking you are running a few PSI less than what it did before. not flaming I just dont see how your picking up 6-8 psi. I just noticed a pound or so. I did swap around measuring pre and post IC also......no flames just curious:)

oh, 31 ish measured pre IC.

[quote=ratlover;628943]:think: I definatly didnt pick up that.

It was from Bart on the Simpsons, what I meant is on the contrary. No ill well intended or taken. Although we've never met I have always respected your input and feedback on the forum.

I saw a difference due to the signal delay and the psi drop on the backside. I'm working today and I'll have a little time tomorrow to move hoses and I'll recheck what I got before modification. I can easily get overboost codes with it post CAC, unlike before. No kinks in the line either. I also pull my boost psi from the same area. If I can find another working boost gauge I'll pull signals from both areas so I can give more meaningful data.

Interesting for sure.
I have used bleed valves on my Turbo Buick before I ended up with the Innovative Boost Controller. That controller was very nice.

At this time I am tapping the stock Duramax wastegate line to hook up a boost guage. I may need another tap location to use a bleed valve.

Los Lobos,
Do you have a diagram of your system ? I am not sure what goes where with your method?

Thanks for the input.

I plugged the line off the turbo with a bolt. I used a hose nipple on the SD manifold and a new piece of hose and ran it to the wastegate. I have tried using smaller tubing to slow down the signal more but I saw to high of boost psi and switched to the way it is now.

The pic is of the old method you can see a tee off of the manifold into the adapter attached to the wg hose. Now the wg hose goes direct to the manifold.

Clear enough Los Lobos, Thanks.
Looks like another way to accomplish what I am after. I need to finish my boost guage and get SDs manifold. I have been putting that off too long (along with a few other mods). That way I have another boost source to experiment with your method and/or a bleed valve.

Boost guage is on and working.
Now I need the SD manifold for another tap. Not sure when, but some day soon.

Well, I am back already after a little more research here,
Apparently the bleed valves are a little risky.
I am already seeing 29.5 lbs of boost and 31-32lbs may be about all I can "safely go up to".

That I will seek.

Thanks again for the inputs

I have an extra spring (a carb return spring) and a bleed on my 02. I get about 34 psi of boost after the intercooler. My boost gauge is tapped into the aluminum elbow going into the intake manifold. I have been running this setup for about 2 1/2 years now no problems. On my friends truck I used a plastic Y setup similar to a Turbo Buick and used the end of a Bic pen as the bleed restrictor. That nets him about 30 psi after the intercooler.

Didnt take it as offensive :)

So you see that much drop by switching your boost gauge pre and post IC? I just didnt notice that kinda difference and I have never heard of anyone else showing that kinda pressure drop across the IC.

I toyed with the idea of making a electronic wg bleed deal that wouldnt(or I wouldnt try to) increase the peak, just speed spool up but never messed much....now that I'm on spray I could care less about getting a a bit more on #2. Turbo buicks use a little electric valve in the WG line that is normally open right end the car applys voltage to close em? Anyone know much about em?

Didnt take it as offensive :)

So you see that much drop by switching your boost gauge pre and post IC? I just didnt notice that kinda difference and I have never heard of anyone else showing that kinda pressure drop across the IC.

I toyed with the idea of making a electronic wg bleed deal that wouldnt(or I wouldnt try to) increase the peak, just speed spool up but never messed much....now that I'm on spray I could care less about getting a a bit more on #2. Turbo buicks use a little electric valve in the WG line that is normally open right end the car applys voltage to close em? Anyone know much about em?

I still have one of those little wastegate solenoid critters from my Turbo Buick Days. hm...........
They were controlled by the ECM via the chip program. Performance Vendors offer program chips to alter boost through the stock wastegate solenoid, serving as a bleed valve. I suppose I might be able to apply the correct voltage to that valve and use it on my truck with inside Cab control.

Damn Rat, you have given me another thought :cool2:

JrTuner, your carb return spring sounds interesting. Where and how did you attach it, and how is it working out?

Also, what fueling box or programmer do you have to get 34 psi boost?

Thanks

I have an extra spring (a carb return spring) and a bleed on my 02. I get about 34 psi of boost after the intercooler. My boost gauge is tapped into the aluminum elbow going into the intake manifold. I have been running this setup for about 2 1/2 years now no problems. On my friends truck I used a plastic Y setup similar to a Turbo Buick and used the end of a Bic pen as the bleed restrictor. That nets him about 30 psi after the intercooler.

You keep that up for long and can you say BOOM??? 34psi is getting to the "too much" point on a LB7...

I attached it to the wastegate arm and hooked it on something just foward of it ( I can't remember what exactly) . It is a fairly light spring just enough to hold it closed a little longer then in combination with the bleed it spools a lot faster. I am running a Quad 215 and an Edge Hot Juice with Attitude. I have been running this much boost for almost 2 years now with no problems. I remember reading that 40 psi was the upper limit where you were walking a fine line with the stock LB7 turbo. It doesn't matter anyway it will just give me a reason to buy the ATS turbo sooner. ):h

I originly had a simple little deal hooked up with a hobbs switch and nitrous fuel solenoid. Worked well before I got my Big Head installed.

Here's the valve I've been using. Have it dialed in nats ass @ 32 psi. Without I dyno'd 461HP 918tq ...and 499.5HP and 1018TQ with it. Cleaned up my smoke big time with the extreme. Safe? I think it's safe ...never seen anything over 32 psi, have never barked my turbo once ... I'll continue to use it.

On edit: Attaching pict

Here's the valve I've been using. Have it dialed in nats ass @ 32 psi. Without I dyno'd 461HP 918tq ...and 499.5HP and 1018TQ with it. Cleaned up my smoke big time with the extreme. Safe? I think it's safe ...never seen anything over 32 psi, have never barked my turbo once ... I'll continue to use it.

On edit: Attaching pict

Hey Tophog what is that? Where can I find one?

Here's the valve I've been using. Have it dialed in nats ass @ 32 psi. Without I dyno'd 461HP 918tq ...and 499.5HP and 1018TQ with it. Cleaned up my smoke big time with the extreme. Safe? I think it's safe ...never seen anything over 32 psi, have never barked my turbo once ... I'll continue to use it.

On edit: Attaching pict

Tophog,
What was your Boost when you dynoed without the valve ?

PM MaxPayne ...he got it for me.

gmccall, with the Extreme my boost always maxed out at 28 psi before installing the bleeder valve.

Tophog,
If you have a minute i would love to hear how you used this valve to get the extra boost. Do you just put it inline on the existing wg hose?
Also how do I get one.
Thanks! :cool2:

It has a set screw on top and a bleed orfice on the bottom. You increase boost by screwing in the set screw. If the set screw were screwed in all the way (i.e. fully seated it would be the same as blocking off your waste gate! ...definately don't want to go there.)

With this specific valve most guys find they end up with the screw out 1.5-2.0 turns from fully seated to get 31-32 psi max boost.

I got mine thru MaxPayne on this site so you can PM him for details. BTW, they aren't cheap ...

Tophog,
If you have a minute i would love to hear how you used this valve to get the extra boost. Do you just put it inline on the existing wg hose?
Also how do I get one.
Thanks! :cool2:

Thanks for the info! ;)

Hmmmmm, maybe some have stronger wastegates than others or some peoples spring starts to take a dump on em? I know carbon04 seemed to have a spring starting to go weak on him so he put a banks on it since he kept losing max boost too. I swing 30-31 ish pre IC with an unmolested wg with an Xtreme.

I think I remember Steve C. saying with the Extreme you will always see right at 28 psi with the factory wastegate....but I agree, every truck is different.

You shoulda turned that deal for another pound so you could say your truck makes 500 at the rears :p: :D

I don't think many track their numbers to the nearest 1/10th ...and the general rule in math is to always round up :) I wouldn't feel guilty posting 500hp :ro)

You shoulda turned that deal for another pound so you could say your truck makes 500 at the rears :p: :D