Tuning Issue--look inside

[techieman33]

The 1996-2001 four door Explorer's are 216k EEC-V PCM.

The 2002-2005 four door Explorer's use the 1024k PTEC processor.


The 216k refers to the tunefile size. So the tunefile size for my 2003 Explorer is about 1MB (1024k). Lets just say that it sucks when reloading a new tune to my Explorer. Takes forever.

thanks

 

[Turdle]

I changed the thread title--

 

[justin146]

when my engine was stock with just a open exhaust, it was pretty quick to 30mph even with my heavy wheel/tire combo-- I have never notice a lack of low end torque in my truck; just a lack of top end power.

 

[Turdle]

I circled 2 areas in lime green--

do I see a timing retard dip coinciding with the slow RPM rise?

 

[Jakee]

As much as I hate to say it, a dyno would be thing that would tell the story on this. You could look at the torque curve and figure things out.

how much timing is there at the lower RPMS? You can datalog this. One thing I did was add timing down low to get the thing moving. I figure at lower RPMS, I should be safe playing with the timing....I'll leave the higher RPM'S to James.

 

[Jakee]

Jon - Do these engines have a knock sensor? I've been told that my engine will pull timing if it detects a knock. Maybe too much timing down low?

Something banging around in the engine compartment?????? Maybe the intake...(Yes, I'm going out on a limp here but it has happened.)


If you think the exhaust is to big and taking from the low end, you can do a transition going DOWN (Say if you have 3" you can transition down to 2-1/2" for a couple of inches, then back to 3") You can experiment with this with a series of fittings made (2-1/2”, 2-1/4”….ect). Test one at a time until you like. Place them about 38" from the end of the headers. But, I wouldn’t do ANY of this until you get it fully tuned and still don’t like.

 

[jah81592]

I wouldn't worry about measuring the voltage on the tps. If you log throttle position absolute in the datalogging it will tell you what you need to know. If you want to the datalogging will log tps raw voltage as well. Thus eliminating the need for a voltmeter. Send me the log. I will look at it. Robert was right I would log spark source,knock senor (when applicable), and borderline knock.

 

[techieman33]

Any ideas James? Do you need more info?

 

[jah81592]

Shoot me a email of your logs and highlight the areas (timestamp) in your email where your problem is. I will look at it.

 

[techieman33]

email sent

 

[Jakee]

I see the dips in the stock tune as well...Heck, all the lines are starting to run together now.

 

[techieman33]

I see the dips in the stock tune as well...Heck, all the lines are starting to run together now.

Yeah, it doesn't seem to matter what tune I use, they rpm curve was still the same. Also I logged the knock sensor, and it didn't even show up on the graph, so I'm assuming that either it didn't see anything, or I don't have one.

 

[Turdle]

We have no knock sensors--

 

[Jakee]

One less thing it could be.

200 billion more to go.

 

[RubySlow]

No knock sensor? Can I run a gear drive then?

 

[Jakee]

I'm not convinced this is a tuning issue.

 

[rocket 5979]

No knock sensor? Can I run a gear drive then?

Hehehe if you want.

 

[jah81592]

Initial evaluation of the tuning is the stock tune only gives 13* timing. My tuning gives no less than 28* timing during the pull. Initially there was a trans torque reduction now there isn't which is obvious from the amount of timing present in the logs. I agree with Jake I don't believe this is a timing/ torque reduction issue. I am now having him log fuel source. Otherwise the timing looks good. You don't want a peak in timing around the 3400 rpms area as you will get detonation. Most all the spark logged with my customers cars look very similar. From the logs the dead stop with my tuning is 6.277 seconds. Initially this looks like a gearing deal more than a tuning issue. I believe the truck is in a good pull at this rpm and and dealing overcoming aerodynamic inefficiencies,etc. After the log with fuel source I will look and determine further. Until then everything looks good from the logging standpoint.-jh

 

[Jakee]

Hehehe if you want.

I'm completely lost on this comment. I have no idea what not having a knock sensor has to do with a gear drive? I'm not being a smart a$$ here, just wanting to know what you're talking about?

 

[techieman33]

Here is a picture of the log with fuel source added