So Bob, if I'm thinking correctly, I should now be able to remove my blocker plate and Fingerstick, right?Originally Posted by bobo
So Bob, if I'm thinking correctly, I should now be able to remove my blocker plate and Fingerstick, right?Originally Posted by bobo
2005 Silverado Duramax LLY - EFI Live Tuned
1969 Chevrolet C-10 Pickup - Turbocharged 5.3L/4L80E - EFI Live Tuned
1975 Avenger Jet Boat - 6.0L/Berkley pump - EFI Live tune in progress
I would leave the blocker plate but you can definately get rid of the fingers stick.
09 LMM Duramax
I pulled my blocker plate. I have not seen the EGR open on any of my logs w/ it shut off the way I posted. Max, why leave the plate in?
2005 Twin Turbo Dmax/Allison Ext. Cab Short Box 4X4
Best 1/4 11.8 @ 118+ on #2 only
Twisted Diesel Tuning-The leader in Duramax Tuning Services and soon to offer Common Rail Cummins Tuning!
Bobotune at rocketmail dot com
If you play with boost, the drive pressure will be enough to crack open the EGR.
I've never had a blocker in mine. Guess I'll need to check it out...
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Hmm, lots of good info here. Thanks guys.
2005 Silverado Duramax LLY - EFI Live Tuned
1969 Chevrolet C-10 Pickup - Turbocharged 5.3L/4L80E - EFI Live Tuned
1975 Avenger Jet Boat - 6.0L/Berkley pump - EFI Live tune in progress
I should elaborate. LLY only.
With somewhere around 70 - 80 PSI of back pressure in the exhaust there is enough force on the EGR valve to overcome the spring. Boost on the other side will help keep it closed. So once boost builds, the valve shouldn't open. On big tunes with agressive, rapid spool up off idle, you can catch the EGR popping. Keep in mind that once it pops, it pressurizes the intake and provides false boost. So it will actually flutter more than pop. You can hear it when it happens.
There is no power here with the stock turbo, or any benefit that I can see being this agressive, The spool up is the same or worse. The extra back pressure actually hinders the engine making power all the way up the curve.
70-80 psi of back pressure in the exhaust? Wow that sounds like a lot!Originally Posted by Fingers
Wouldn't you want to get rid of thatkind of BP with a decent exhaust system? I assume that when the main pulse width is increased the additional fuel helps create a large combustion cycle that will help the turbo spool up. How do we get more boost?
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The best way to get rid of the excess back psi would be to upgrade the stock VVT turbo. It is the root cause of the problem.
2005 Twin Turbo Dmax/Allison Ext. Cab Short Box 4X4
Best 1/4 11.8 @ 118+ on #2 only
Twisted Diesel Tuning-The leader in Duramax Tuning Services and soon to offer Common Rail Cummins Tuning!
Bobotune at rocketmail dot com
Ohh, and Welcome Fingers!!! You have forgoten more about this motor than I will ever know. Good to see you here and thanks for the input!!
2005 Twin Turbo Dmax/Allison Ext. Cab Short Box 4X4
Best 1/4 11.8 @ 118+ on #2 only
Twisted Diesel Tuning-The leader in Duramax Tuning Services and soon to offer Common Rail Cummins Tuning!
Bobotune at rocketmail dot com