Out of curiousity, what is your max boost?

 

the higest boost that i have seen is about 31lbs, really getting on it. I was considering pinching off the wase gate but i did not know how that would work on these electrical wasegates. So i should just pinch it between the turbo and the actuator, or wher in the line is best. Thank you

 

Actually I usually put a carburetor stud inside the factory hose and put a hose clamp around it. This assures nothing gets through. Anywhere between the actuator and the turbo is fine. Mine shows 40psi on the TST guage but I think it makes more and the MAP sensor is just pegged out at 40... All I know is it works well at keeping EGT's down.

 

Thank you for you info agian. How exactly does the wastegate operate if i completley block it off. Or is that the point, for it to no longer opperate. The reason that i ask is that i would think that with the waste gate open, that there would be better flow, its probably something that i dont understand. Also, will this effect my gas mialage?How bad is it on the turbo cause if i can id like to get by without replacing the turbo, if i can get the EGTs down enough, but i want to do it without destroying the turbo. Thank you

 

It won't hurt your turbo. It's common practice around here to do that and I don't know of a single one that's been hurt. It only holds the wastegate shut under throttle. When you take your foot off the pedal it still opens mechanically to dump the exhaust.
Wastegates open to bypass the fins of the turbocharger to limit boost when under acceleration. They also open mechanically under deceleration to keep the turbo from "barking" To get maximum boost from any wastegated turbo you must fully close the wastegate.
I started off with the TST and boost elbow which netted me 30ish psi and would climb instantly to 1500deg! After I blocked it off the TST shows 40psi instantly and the egt take at least a minute to get to 1450...

 

Thanks for all your info whitesport00, it has been an amazing help to me. What i was told, was that the higher the boost, the harder the engine is working. Is this correct and will it affect my gas mialage. Would it work just as well if i pull the hose off the actuator and pinch it there and pull it out of the way (not hook it back to the actuator)and just closed off the inlet on the actuator with a plug to keep dirt and grit out of it.
Thank You

 

DID YOU GET ANY MORE POWER OR MILEAGE AFTER THE CAT FELL OFF?

 

I didnt notice much power increase, but the mialage went up about 1 or 2 mpg's. But both the muffler and the cat fell off at the same time so i dont know what "just" the cat falling off did, only what happened after they both fell off. But i would think that the cat was a big part of it.

 

Higher boost levels don't mean that your engine is working any harder. What they probably meant was that boost is a sign of engine load. (You know when you go up a hill the boost goes up, even if the cruise is on.) Boost is directly related to engine load on all turbocharged engines. You can hold it at WOT in Nuetral and not make any boost, because you have no load... And you can block it off any way you want, just as long as dirt doesn't get in the actuator and air doesn't get out of the hose. I would just stick a small bolt in the end of the hose and put a hose clamp around it, and put a vacuum cap over the nipple on the actuator if you want to do it that way...

 

thank you whitesport600, that is exactly what i wanted to do. Thanks agian for all your help.

 

So whitesport600,

Any bets on when you are going to pop your stock turbo spiked 40 psi through it?

I can get over 40 psi on my TST display...but maybe the MAP sensor is different on your 4.5. I would think you should be able to do 45 psi boost looking at you numbers.

I bet the turbo is wasted in 5k or less.

 

LOL I love all of the negative comments on this board. My 02 had 65k with the stock turbo making 48psi when I sold it (it's still running on the stocker at 100+k) and this 04.5 has almost 10k so far with no problems. I wouldn't do it on a 305/555 because of the notoriously weak turbos, but the 600's turbo is much stronger.

 

Not being negative...just questioning the feasibilty, practicality, and durability of trying to push 450 hp's worth of exhaust through the stock turbo. I know where I live, the elevation, steepness of most roads, and the way I drive...I couldn't.

 

Well, really this thread isn't about my truck, I was simply stating that with the BD programmer alone he will be better off with the extra boost. I realize that mine is on borrowed time with that much power, but it's holding on just fine until the B1-04 arrives

 

I installed my downloader a few days ago and my outlook moniter today. I was shocked at the high egt's running in the performance mode. Post turbo I can easily hit the recommended 1050 F warning level.

If most everyone agrees that the easiest way to lower egt's is a larger turbo, than are there any suggestions as to manufacturers?