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Discussion Starter #1 (Edited)
This was way to easy not to post and a lot cheaper then paying $110 bucks for one.

Before we started the truck was peaking at about 6 psi on the street and only holding maybe 4.5-5 psi.

We started by cutting the housing where it bends over to brake it open. As you can the inside is very simple.


Take a grinder and grind off the little cap on the end of the rod. Take it easy on it so you can save the little cap on the end to use latter.


Next take a tap and die set and thread the factory waste gate rod. I ran this one down a little over 2 inches.



Then its as simple as putting every thing back the way it came off. The only diffrence is your using a nut to adjust the spring pressure. I turned this one all the way out to start off and made about 5 pounds of boost. After a lot of testing i ended up turning the nut about 12 times or about 3/4 of a inch to make about 9 pounds of boost. This is what it looks like on the truck.


The truck is now hitting about 10 psi then droping to a solid 8 and doesnt drop below 6 even at higher RPM's. During normal driving you can hear the turbo much more and the truck now makes about 6 psi under normal driving conditions unless you get on it a little bit of course ;)


There is still a little room for improvment but over all boost is now a lot more controlled and doesnt spike and drop like it did before. Just the few extra PSI has woken this old girl up.
 

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Discussion Starter #3
12-24
 

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Discussion Starter #5
Hmmm no but thats a good idea.
 

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this may sound dumb but did you use the factory spring
 

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Discussion Starter #8 (Edited)
Yes i used the factory spring. The more you tighten the spring the more pressure it takes to close the waste gate. I have not tried to push it to see how much boost you can get out of the factory spring but there is still a good bit of adjustment that could be made for guys wanting to run more boost.
 

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Yes i used the factory spring. The more you tighten the spring the more pressure it takes to close the waste gate. I have not tried to push it to see how much boost you can get out of the factory spring but there is still a good bit of adjustment that could be made for guys wanting to run more boost.
Remember....Yours is not vacuum controlled in a 93, you won't find that spring inside a vacuum WG actuator. This won't work with a 94 and newer actuator.
 

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Discussion Starter #10
This should go with out needing to be said but your must have some way to watch your boost pressure. I paid 22 bucks at advance auto for the sunpro gauge and it works just fine.
 

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I think that holding 6 psi going down the highway will hurt you fuel mileage.
 

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Discussion Starter #12 (Edited)
I dont see how it would hurt your fuel mileage. Your not adding any more fuel and your making more power at a lower rpm reducing the need to steep on the gas more or down shift. In fact you may even use less fuel.

I played around a little more with it today and now have the truck peaking at about 11 psi and holding about 9 and you can fill a huge diffrence in power when in OD on the highway.
 

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make sure to watch your exhost gas temp. I just blew a hole through a piston in my 93' due to over boosting my engine, which helps couse more heat, there for melting the pistion down. if you dont have a pyrometer, i would highly recomend one. You should never run the truck with a exhost gas temp of over 1200-1250 deg. if it goes up over that get off the gas untill it drops down.
 

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I think that holding 6 psi going down the highway will hurt you fuel mileage.
I dont see how it would hurt your fuel mileage. Your not adding any more fuel and your making more power at a lower rpm reducing the need to steep on the gas more or down shift. In fact you may even use less fuel.

I played around a little more with it today and now have the truck peaking at about 11 psi and holding about 9 and you can fill a huge diffrence in power when in OD on the highway.

He's right. You don't want any more than 2-5 PSI cruising empty. More than that causes un-needed drive pressure which takes more power to push out of the cylinders. Thus, you're increasing your parasitic losses of scavenging, so it takes more power to just spin the engine, increasing fuel consumption. It is for this reason that the stock 94+ vacuum system dumps boost when cruising. This is why many people have reported a loss in economy when going from the vacuum system to the TM. It is also part of the reason that I'm keeping the vacuum system and not going to a turbomaster. You're running far too much boost for running empty cruising, but unfortunatly, depending on spring, it may be the only way to get your max boost. This is another reason I like the stock 94+ system.

Excellent work on the controller though. It's something that I think has been needed for some time, making an adjustable wastegate actuator from a stock 92-93 actuator.
 

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Discussion Starter #15
Thanks for the advice. I plan on doing a little more testing today and finish getting it set.
 

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Discussion Starter #16 (Edited)
Did a little more testing today and turned the nut back about 2 full turns. The truck is boosting right around 4 psi at 65 MPH. She is peaking around 10 and holding about 7-8 psi at WOT. During normal driving i dont see any thing over 6 psi. I have driven about 60 miles like this today and didnt notice any loss in MPG.

I did a little off road testing as well ;) and i can say i am very happy with this little mod.
 

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Did a little more testing today and turned the nut back about 2 full turns. The truck is boosting right around 4 psi at 65 MPH. She is peaking around 10 and holding about 8 at WOT. During normal driving i dont see any thing over 6 psi. I have driven about 60 miles like this today and didnt notice any loss in MPG.

I did a little off road testing as well ;) and i can say i am very happy with this little mod.

Yup that's exactly where my turbo is tuned.
 

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Discussion Starter #18 (Edited)
You can see in this pic where we taped the upper manifold for the boost line. I wrapped the line in black electric tape to add some extra protection and not make the line stand out so much.


And here is a better pic of the finished controller
 

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Discussion Starter #19
Still running strong after about a week now. MPG has stayed the same so far and i have not noticed any extra oil in or around the intake or turbo.
 

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awsome, great work! what are you getting for mpg?
 
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