That spec is for testing the wastegate unhooked from the engine. With drive pressure acting on the wastegate disc it is much less. All the ones I've seen are 8 psi.
High egts and low boost pressures
- Thread starter Philip1
- Start date
Which is why it’s so important to have preturbo exhaust leaks taken care of, regardless the wastegate has a 12# spring
Correct.
Update:
I got all the exhaust couplers on the y pipe and the crossover tube sealed, the up pipe joint was not leaking and I reclocked the turbo so the hat sits tighter on the manifold. The egts did improve a little but and dropped to 1000 to 1050 degrees and but the boost betweenat 2300 rpm still doesn't get above 7psi. If I drop a gear and get to 2800rpm itll climb to 9psi. I'm wondering if there is other things I can look at to get the egts down?
I got all the exhaust couplers on the y pipe and the crossover tube sealed, the up pipe joint was not leaking and I reclocked the turbo so the hat sits tighter on the manifold. The egts did improve a little but and dropped to 1000 to 1050 degrees and but the boost betweenat 2300 rpm still doesn't get above 7psi. If I drop a gear and get to 2800rpm itll climb to 9psi. I'm wondering if there is other things I can look at to get the egts down?
The_Josh_Bear
Full Access Member
Unplug the wastegate tube and stuff a bolt or similar inside the tube to seal it up from the boost. Then see what your numbers are. This should get you 10-12 if your exhaust is indeed sealed well and you are maxed out on the IP.
As said, check timing too. Too retarded really tends to add heat.
As said, check timing too. Too retarded really tends to add heat.
Black dawg
Registered User
That is a pretty neat document!
Every one that I have worked on made right close to 7psi in stock form
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I don’t know about your truck, but with mine, it’s not hard to pin the egts high at 2k rpm. I’m definitely not a factory turbo but 2500-2800 seems a reasonable spin to build more boost and cool it down.
Black dawg
Registered User
how much smoke do you get if you jump on the throttle at under 1500 rpm? Wonder if the pump has been turned up
Welp bad news everybody. I was just creating a pass when the turbo caught fire. Damage is less than it could have been but it's still disabled for now. Thanks for the help but itll be a while before I can work on it again
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*Crossing*
The_Josh_Bear
Full Access Member
Holy schmoly batman that sucks! How...does a turbo catch fire? That really stinks, glad it wasn't worse but dang.
You didnt mention the under hood filter, that doesn't help EGTs either. (I have one too!)
Fun fact: The OE setup is actually really good for cool air intake and flow, Justin at R&D did back to back dyno runs with OE intake vs no intake at all(so no restriction, plus open hood) and the results were statistically insignificant. Only about 3hp difference and even then it favored the intake setup.
You didnt mention the under hood filter, that doesn't help EGTs either. (I have one too!)
Fun fact: The OE setup is actually really good for cool air intake and flow, Justin at R&D did back to back dyno runs with OE intake vs no intake at all(so no restriction, plus open hood) and the results were statistically insignificant. Only about 3hp difference and even then it favored the intake setup.
I figured either a fuel return started leaking under the turbo or the oil feed/drain started leaking onto the hot turbo and the rest is history. With the intake, the kit I bought did not include the intake system so I had to make do
IDIBRONCO
IDIBRONCO
Sorry to hear about your bad luck. If you want to look a a positive though, now would be the perfect time for a turbo upgrade! Either buy a drop in from Wes or Justin. No more low boost issues!
