DP Tuner and ZF6 manual question.
#46
06-16-2009 | 10:03 PM
Butt-Head
Joined: Apr 2004
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From: Reed Point, MT
This is an exact repost of what I wrote in the SECOND post of this thread:
Why does nobody even READ these posts?
Oh yeah, we're all too busy trying to figure out what sensor is bad.
Originally Posted by my dumb ***
There are a couple of tuning tricks that are at work here. One is the low boost fueling and the other is MAP transfer.
In a nutshell, the PCM is "seeing" less boost than what is actually there (MAP Transfer) and is not commanding much fuel to be injected due to the low boost fuel values.
For example, when you have low boost conditions such as 0-5 PSI actual, the PCM is only "seeing" 0-1 PSI. Certain values in the low boost fuel table are similar to stock.....which means LESS fuel until you get a few more PSI of actual boost.
However, it certainly is nice to not have to worry about overboost defueling.
In a nutshell, the PCM is "seeing" less boost than what is actually there (MAP Transfer) and is not commanding much fuel to be injected due to the low boost fuel values.
For example, when you have low boost conditions such as 0-5 PSI actual, the PCM is only "seeing" 0-1 PSI. Certain values in the low boost fuel table are similar to stock.....which means LESS fuel until you get a few more PSI of actual boost.
However, it certainly is nice to not have to worry about overboost defueling.
Oh yeah, we're all too busy trying to figure out what sensor is bad.
#47
06-16-2009 | 10:10 PM
Lead Driver
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From: Santa Cruz Ca.
#48
06-16-2009 | 10:24 PM
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If it is the MAP sensor then I have a bad one and my father has a bad one also.
I switched them out after your first post and saw no difference in the performance.
I tried that before I contacted Jody or Clay.
I do appreciate the help though.
I started a long thread on my first try!
I feel all warm and special!
I switched them out after your first post and saw no difference in the performance.
I tried that before I contacted Jody or Clay.
I do appreciate the help though.
I started a long thread on my first try!
I feel all warm and special!
#50
06-17-2009 | 09:01 AM
Mountain Pass
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From: Stewartsville, Mo.
#51
06-17-2009 | 10:09 PM
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#52
06-19-2009 | 09:41 AM
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From: Littleton, CO
Ok, can now add my initial $0.02 here.
[Yes, I got my DP installed last night - woo hooo!
https://www.ford-trucks.com/forums/8...ks-thread.html]
So far I've only clocked my test spin and the commute to work today, so have only messed with 80E and Decel.
While I'm in complete agreement that the kick-in-the-a$$ doesnt drop in until around 17-1800rpm (and when that happens... HOLD ON!), I'm not convinced that the lower end is any worse than stock. Mine's always been a bit of a "dog" below ~1600rpm with a load, which I found surprising as I've always thought diesels were known for low-end performance.
Drive in today on the highway (80E) looks like the EGTs are just a touch higher than stock, and the OBD is reporting lower boost than the gauge sees - but the boost is definitely higher than stock (70-75mph ~21-2200rpm). The couple of hills/acceleration from traffic I dealt with letting the rpms drop <1500 seemed about the same as stock from SOTP.
Will work with 80T next weekend with the camper in the mountains and report back again.
[Yes, I got my DP installed last night - woo hooo!
https://www.ford-trucks.com/forums/8...ks-thread.html]
So far I've only clocked my test spin and the commute to work today, so have only messed with 80E and Decel.
While I'm in complete agreement that the kick-in-the-a$$ doesnt drop in until around 17-1800rpm (and when that happens... HOLD ON!), I'm not convinced that the lower end is any worse than stock. Mine's always been a bit of a "dog" below ~1600rpm with a load, which I found surprising as I've always thought diesels were known for low-end performance.
Drive in today on the highway (80E) looks like the EGTs are just a touch higher than stock, and the OBD is reporting lower boost than the gauge sees - but the boost is definitely higher than stock (70-75mph ~21-2200rpm). The couple of hills/acceleration from traffic I dealt with letting the rpms drop <1500 seemed about the same as stock from SOTP.
Will work with 80T next weekend with the camper in the mountains and report back again.
#54
06-19-2009 | 01:55 PM
Butt-Head
Joined: Apr 2004
Posts: 8,785
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From: Reed Point, MT
That therein is the "problem". It's not so much a problem as it is a tuning change. I think we're all in agreement now on this issue. If anyone else questions it as being the tuning.....well, it's beyond me. 
#56
06-30-2009 | 04:10 PM
Hook it, I'll pull it.
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From: Grand Lake, La.
#57
06-30-2009 | 04:17 PM
Lead Driver
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From: Santa Cruz Ca.
#58
06-30-2009 | 04:51 PM
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
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From: Grand Lake, La.
That does seem strange to me. Maybe someone going to the East event with a 6sp can show Jody what is happening. I had the oppisite happen to me after my injector install. My pedal was so responsive, I couldn't drive it in town. With live tuning he had it running the way it should.
#59
06-30-2009 | 05:04 PM
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From: Bowling Green, Kentucky
#60
06-30-2009 | 09:42 PM
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From: Central Coast of CA
So, I tried it again, feathering the clutch, letting it slip first gear to try and take off fast, like you might do while drag racing, while still trying to keep traction, and again, nothing. It just falls on its face and then gradually builds speed, slowly gaining momentum.
Stewart