DP Tunner installed, WOW!!!
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Senior User
Joined: Mar 2004
Posts: 200
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From: Leavenworth Washington
DP Tunner installed, WOW!!!
So I got my DP Tuner, stock, high Idle, 40HP tow, 60HP tow, 80HP econ, 120HP race.
Did a test run down the highway with 80 HP econ and what a difference from stock. I switched it 120HP race on the on ramp to get back onto the highway and all I can say is my truck just scared me, RPM's went up, MPH went up FAST! And boost was climbing fast; I let off of the throttle at what looked to be 25psi of boost and about 80MPH, what a ride! its back at 80HP econ right now, where it needs to stay. "Lead foot bad"
A question I have is how much boost is safe to go to? what could/would happen at higher boost levels?
before the Tuner I could only ever get to about 19 PSI, with the DP tuner it doesn’t seem like it will stop building boost pressure, does any one have a similar set up of mods as me and if so what is the max boost the engine will make with the mods I have ?
Did a test run down the highway with 80 HP econ and what a difference from stock. I switched it 120HP race on the on ramp to get back onto the highway and all I can say is my truck just scared me, RPM's went up, MPH went up FAST! And boost was climbing fast; I let off of the throttle at what looked to be 25psi of boost and about 80MPH, what a ride! its back at 80HP econ right now, where it needs to stay. "Lead foot bad"
A question I have is how much boost is safe to go to? what could/would happen at higher boost levels?
before the Tuner I could only ever get to about 19 PSI, with the DP tuner it doesn’t seem like it will stop building boost pressure, does any one have a similar set up of mods as me and if so what is the max boost the engine will make with the mods I have ?
Logistics Pro
Joined: Mar 2004
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Glad you like it! 
Do you have a boost regulator for the map sensor to keep it from seeing all that boost?
The most boost you could get up to with stock injectors and a chip is around 28-32 psi or so. The only problem that poses is being tougher on the turbo than sticking to 25 psi or less, if the turbo is stock. Gets a bit out of its efficiency range.
Do you have a boost regulator for the map sensor to keep it from seeing all that boost?
The most boost you could get up to with stock injectors and a chip is around 28-32 psi or so. The only problem that poses is being tougher on the turbo than sticking to 25 psi or less, if the turbo is stock. Gets a bit out of its efficiency range.
Senior User
Joined: May 2004
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From: Minnesota
I have similar tunes (including 140 smoke), and cannot wipe the smile off my face. I was told to try to keep it under 25 psi (hard to do sometimes).
Ryan, do you know if it is just inefficient above 25 psi, or is it actually shortening the life of the turbo??
Ryan, do you know if it is just inefficient above 25 psi, or is it actually shortening the life of the turbo??
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Senior User
Joined: Mar 2004
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From: Leavenworth Washington
I have a wicked wheel, but have not installed it yet, will that take care of the inefficiencies issues of too much boost for the stock turbo?
I have had to wait till warmer weather to install it, my truck wont fit in a garage. its tooooo long.
I have had to wait till warmer weather to install it, my truck wont fit in a garage. its tooooo long.
Logistics Pro
Joined: Mar 2004
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Originally Posted by Highmark18
I have similar tunes (including 140 smoke), and cannot wipe the smile off my face. I was told to try to keep it under 25 psi (hard to do sometimes).
Ryan, do you know if it is just inefficient above 25 psi, or is it actually shortening the life of the turbo??
Ryan, do you know if it is just inefficient above 25 psi, or is it actually shortening the life of the turbo??
Originally Posted by erik_bishop
I have a wicked wheel, but have not installed it yet, will that take care of the inefficiencies issues of too much boost for the stock turbo?
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Logistics Pro
Joined: Mar 2004
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The boost regulator is for the purpose of fooling the map sensor. When the map sensor sees about 22-23 psi or more, it'll set the SES light and defuel to help prevent overboost. I'm surprised yours isn't already if you're running in the upper 20s. Maybe you already have a relief valve or regulator of some sort from a previous owner? I'd have thought that Jody would've recommended one to you when you ordered the chip, if you didn't have one already.
Anyway, best setup is the regulator from Dennis at ITP Diesel (he's a site sponsor, too
)
http://www.itpdiesel.com/store.php?c...on=show_detail
Anyway, best setup is the regulator from Dennis at ITP Diesel (he's a site sponsor, too
)http://www.itpdiesel.com/store.php?c...on=show_detail
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
Congrats on joining the "darkside" of the tuner world. 
Ryan has hit the nail on the head with keeping the boost under 25 psi with a stock turbo, and the reasons why. The WW may change the suge line, and possibly the choke line, but you're still dealing with the higher backpressure on the exhaust side. Only cure for that is either a different exhaust housing or a different turbo.
Ryan has hit the nail on the head with keeping the boost under 25 psi with a stock turbo, and the reasons why. The WW may change the suge line, and possibly the choke line, but you're still dealing with the higher backpressure on the exhaust side. Only cure for that is either a different exhaust housing or a different turbo.
