Milzy Stage 2 dyno

[sprucegagt]

The biggest change you'll see in VE tuning is in your fuel trims when transitioning between different fuel trim cells. You'll find out that you'll get a much more consistent fuel trim adjustment instead of it making big jumps. Plus most people report a jump in gas mileage. You have to remember the VE table is not a true volumetric efficiency table. It is only a multiplier to the MAF table to adjust for various load and rpm conditions.

As for how to do VE tuning. I have always done it with the MAF disconnected, the good fuel spark timing table copied to the bad fuel spark timing table and set PE to NEVER activate. You want it to run in closed loop. I have no idea why you would want to do it with the O2 sensor disconnected. Like I said it is not a real VE table.

[MMGT1]

Does the DHP unit give you all of these tables?(fuel trims and idle air control)There is no support with HP tuners for the idle...

[jackal2000]

here is everything you can change with DHP under "Fuel"

[onefastV6]

DHP also has the following under the Accessories tab,

IAC_Idle_RPM_Trans_Not_Engaged

IAC_Idle_RPM_Trans_Engaged

[jackal2000]

DHP also has the following under the Accessories tab,

IAC_Idle_RPM_Trans_Not_Engaged

IAC_Idle_RPM_Trans_Engaged

yea i forgot about those two.

and its actually

IAC_Desired_Idle_RPM_Trans_Not_Engaged

IAC_Desired_Idle_RPM_Trans_Engaged


not to be nit picky or anything lol

[AaronGTR]

http://www.hptuners.com/forum/showthread.php?t=7848

See if this works for you. If you have to, sign up to the forum and check out this thread. If you can make sense of this maybe you can help me out. The difference between the 8's the 3400's and the 3.8's had me "out in left man". Be nice if someone could put a definitive word to this!!!!

Didn't read thru the whole thread, but what the guy said at the end of the first post is correct. It uses the VE table all the time. From what I've read about the operation of obd2 pcm's, they reference the VE table first for a base fuel enrichment and spark timing based on the MAP and rpm, then it uses other inputs sometimes referred to as "modifiers" to add or subtract from the values in that table based on the reading from those sensors. Those include the MAF, O2, IAT, and a few others. When it's done adding and subtracting all those you get your final numbers.

As Spruce said tuning your VE will help bring your fuel trims in line and especially between fuel trim cells. I can tell my VE table needs work because my ltft's are positive while in cell 0 at idle yet go to negative cruising under load in fuel trim cell 2 but at similar MAP pressures. Obvious evidence that the VE has changed enough from adding the cam and blower that simply tuning the injector flow rate and MAF tables alone can't get the fuel trims just right. Since you have a big NA cam you probably experience the same thing. VE tables need tuning, but then fine tuning will be done with the MAF table, especially at WOT.


ps, sorry for the long posts. This is a complicated subject though and I'm still getting a handle on it myself.

[sprucegagt]

here is everything you can change with DHP under "Fuel"

That's not everything. But not all of the model years have this function.

[jackal2000]

That's not everything. But not all of the model years have this function.

we have the same year. what is different?

[sprucegagt]

we have the same year. what is different?

MAP.

[MMGT1]

How much for the DHP unit? One of you guy's have a link for me? Not really liking where HP is going to tell the truth. They are great if you're a LS1 or something along those lines. The unit can do anything and everything with the 8's. The 6's can't even tune idle!! I've been using the HP program since X-mas and have basically gotten nowhere with it. That's why I think I would like to have a closer look at the DHP unit. Well, like I asked, got a link?

[jackal2000]

https://www.pfyc.com

[xonelith]

Just a comment for you Paul (MMGT1). HPT and DHP can pretty much change the same stuff for V6's (at least a year ago; I looked at the parameters myself and did a full compare... i have a word document somewhere). I think DHP has a few more boost related parameters, but if you are confused with HPT, you will be just as confused with DHP (I think there forum might be better, but I like the HPT forums just the same).

I think before you can understand either piece of software, you need to understand what the MAF does, what a MAP does, what a wideband does and some other info in order to tune accurately.

This stuff isn't easy and I'm still learning the stuff. You'll notice alot of people who are tuning (whatever software they use) are still learning. As a side note, if you plan to do VE tuning (speed density; no MAF), be prepared to be confused. It takes alot of patience and alot of time to do this. I have procrastinated for some time now myself Also, from what I have heard, the MAF is more accurate than the MAP. I'm not saying that VE tuning is useless, I'm just saying going totally SD may not be the wisest move, but I do think that tuning VE is beneficial.

It's your call bro, but I don't think you'll get a better tune with DHP than with HPT. I think you'll get the same tune!

This is just my opinion, and I'm still a novice, so TIFWIW.