Of boost and mileage.......Luring DP Tuner in to comment....
Post Fiend
Joined: Jun 2004
Posts: 9,293
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From: Parker, CO
But of course if you were to try that, you'd have really bad fuel mileage and terrible performance issues. You may think that the engine is in no need of positive manifold pressure, but try running with no turbo at highway speeds (65-75 mph).
Anyone ever blow a boot and try to maintain speed on the highway? What did your EGT's look like?
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From: Hoschton,GA
Yes low boost on the hoighway is the best for mileage and is why we came ot with the 60hp econo tune. This is also why I run the GQSSB turbo on my Excursion. This is a very efficient turbo and normally runs at 2 psi on the highway which helped me to get 21 MPG with all of my mods. The higher the boost the more backpressure which makes the motro work harder to maintain the speed and causes a loss in mileage. This is another reason I do not recommend the GTP38R turbo.
Jody
Jody
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From: Hoschton,GA
Yes low boost on the highway is the best for mileage and is why we came ot with the 60hp econo tune. This is also why I run the GQSSB turbo on my Excursion. This is a very efficient turbo and normally runs at 2 psi on the highway which helped me to get 21 MPG with all of my mods. The higher the boost the more backpressure which makes the motor work harder to maintain the speed and causes a loss in mileage. This is another reason I do not recommend the GTP38R turbo.
Jody
Jody
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Posting Guru
Joined: Feb 2007
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From: North Cackalacky
Yes low boost on the highway is the best for mileage and is why we came ot with the 60hp econo tune. This is also why I run the GQSSB turbo on my Excursion. This is a very efficient turbo and normally runs at 2 psi on the highway which helped me to get 21 MPG with all of my mods. The higher the boost the more backpressure which makes the motor work harder to maintain the speed and causes a loss in mileage. This is another reason I do not recommend the GTP38R turbo.
Jody
Jody
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From: Hoschton,GA
Either one would be a nice upgrade. I would go with the modified H2E to get more air. I had a guy switch from the standard H2E to the modified one and picked up 50 RWHP.
Jody
Jody
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FTE Leadership Emeritus
Joined: Sep 2003
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From: Houston, Texas
Yes low boost on the highway is the best for mileage and is why we came ot with the 60hp econo tune. This is also why I run the GQSSB turbo on my Excursion. This is a very efficient turbo and normally runs at 2 psi on the highway which helped me to get 21 MPG with all of my mods. The higher the boost the more backpressure which makes the motor work harder to maintain the speed and causes a loss in mileage. This is another reason I do not recommend the GTP38R turbo.
Jody
Jody
Snowboard season cometh..
Joined: Jan 2006
Posts: 5,406
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From: Gulf Coast of Florida
Yes low boost on the highway is the best for mileage and is why we came ot with the 60hp econo tune. This is also why I run the GQSSB turbo on my Excursion. This is a very efficient turbo and normally runs at 2 psi on the highway which helped me to get 21 MPG with all of my mods. The higher the boost the more backpressure which makes the motor work harder to maintain the speed and causes a loss in mileage. This is another reason I do not recommend the GTP38R turbo.
Jody
Jody
38R = $1600
QSSB = $2700
GQSSB = $3000
Maybe when I hit a big lottery I'll get to play with those other turbos....
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Yes low boost on the hoighway is the best for mileage and is why we came ot with the 60hp econo tune. This is also why I run the GQSSB turbo on my Excursion. This is a very efficient turbo and normally runs at 2 psi on the highway which helped me to get 21 MPG with all of my mods. The higher the boost the more backpressure which makes the motro work harder to maintain the speed and causes a loss in mileage. This is another reason I do not recommend the GTP38R turbo.
Jody
Jody
Thank you very much for getting back to us!!!
This is exactly what I thought. Boost is good, but if it's more than you can burn with the fuel, you're running un-necessary back pressure which will rob power.
It would be cool to make a vent bypass operated by a microcontroller. It would have an EGT sensor, and an optical sensor to check exhaust for soot. If it senses a little soot, it will add a little more turbo, if it senses high EGT's, it will add more turbo. If it senses decent amounts of soot, it will add full turbo to make sure that the truck still makes quick fast boost under acceleration. It would constantly monitor EGT's and smoke, and try to vent as much exhaust past the turbo as possible.
Theres a few motorized exhaust valve kits floating around for cheap.... and it would take about 100$ worth of electronics.
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Joined: Mar 2005
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From: Hoschton,GA
Thank you very much for getting back to us!!!
This is exactly what I thought. Boost is good, but if it's more than you can burn with the fuel, you're running un-necessary back pressure which will rob power.
It would be cool to make a vent bypass operated by a microcontroller. It would have an EGT sensor, and an optical sensor to check exhaust for soot. If it senses a little soot, it will add a little more turbo, if it senses high EGT's, it will add more turbo. If it senses decent amounts of soot, it will add full turbo to make sure that the truck still makes quick fast boost under acceleration. It would constantly monitor EGT's and smoke, and try to vent as much exhaust past the turbo as possible.
Theres a few motorized exhaust valve kits floating around for cheap.... and it would take about 100$ worth of electronics.
This is exactly what I thought. Boost is good, but if it's more than you can burn with the fuel, you're running un-necessary back pressure which will rob power.
It would be cool to make a vent bypass operated by a microcontroller. It would have an EGT sensor, and an optical sensor to check exhaust for soot. If it senses a little soot, it will add a little more turbo, if it senses high EGT's, it will add more turbo. If it senses decent amounts of soot, it will add full turbo to make sure that the truck still makes quick fast boost under acceleration. It would constantly monitor EGT's and smoke, and try to vent as much exhaust past the turbo as possible.
Theres a few motorized exhaust valve kits floating around for cheap.... and it would take about 100$ worth of electronics.
Nice idea and kind of similar to the variable vane config.
Jody
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Lead Driver
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I think the variable vanes would be quicker to change power because they are controlled by the PCM.
My idea essentially is to make a microcontrolled "smart" wastegate that will operate based on EGT's and smoke . levels.
Once it has 1-2 lbs of boost, it will constantly try to vent exhaust past the turbo until EGT's or smoke occurs. Depending on how high the EGT's rise or smoke becomes, would change the rate at wich the bypass operates.
For EG, on the highway on cruise, it will slightly balance just enough boost to keep the EGT's down. But, if you mash the throttle, the sensor would detect the smoke and close the bypass instantly to make sure power is readily available.
Logistics Pro
Joined: Dec 2010
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From: Temperance, MI
People simply use boost as a general reference of fuel economy. It's a "poor man's" lie-o-meter. That's all it is. Nothing more. It is not always a true indicator of fuel mileage, just like the overhead display. Heck, you could run 3 psi of boost, but have 1000 degrees EGT's.... and your fuel mileage will suck.
Junior User
Joined: Jul 2010
Posts: 93
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Yes low boost on the hoighway is the best for mileage and is why we came ot with the 60hp econo tune. This is also why I run the GQSSB turbo on my Excursion. This is a very efficient turbo and normally runs at 2 psi on the highway which helped me to get 21 MPG with all of my mods. The higher the boost the more backpressure which makes the motro work harder to maintain the speed and causes a loss in mileage. This is another reason I do not recommend the GTP38R turbo.
Jody
Jody
Wow, I must be doing pretty good, then.
I recently did a 1,500-mile trip to Tampa and back and averaged 21-22 MPG when calculated at the pump while running the 80 econo tune with stock turbo and the mods in my sig. On the highway I'd see between 0-5psi of boost not towing.
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Joined: Sep 2003
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From: Houston, Texas
Yes low boost on the highway is the best for mileage and is why we came ot with the 60hp econo tune. This is also why I run the GQSSB turbo on my Excursion. This is a very efficient turbo and normally runs at 2 psi on the highway which helped me to get 21 MPG with all of my mods. The higher the boost the more backpressure which makes the motor work harder to maintain the speed and causes a loss in mileage. This is another reason I do not recommend the GTP38R turbo.
Jody
Jody
As it stands now my truck was averaging 15 to barely 16 mpg combined. My speedo is a little off (corrected as much as possible with AE) so I started running the freeway by RPM. Running at about 1750-1800 RPMs, instead of 1950-2000 RPMS netted me an easy 17.5 mpg over the last 2 tanks. (For those wondering, my speed was around 63-64 mph)
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,238
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From: Houston, Texas
Yes low boost on the highway is the best for mileage and is why we came ot with the 60hp econo tune. This is also why I run the GQSSB turbo on my Excursion. This is a very efficient turbo and normally runs at 2 psi on the highway which helped me to get 21 MPG with all of my mods. The higher the boost the more backpressure which makes the motor work harder to maintain the speed and causes a loss in mileage. This is another reason I do not recommend the GTP38R turbo.
Jody
Jody
As it stands now my truck was averaging 15 to barely 16 mpg combined. My speedo is a little off (corrected as much as possible with AE) so I started running the freeway by RPM. Running at about 1750-1800 RPMs, instead of 1950-2000 RPMS netted me an easy 17.5 mpg over the last 2 tanks. (For those wondering, my speed was around 63-64 mph)
Whereas at 1900-1950 (65-67 mph) I got around 15 to barely 16.
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