tuning/troubleshooting software

[xxbackhillxx]

Having problems getting correct readings for knock and getting my fuel trims dialed down.

edit: I got my LTFT's down from -7 to -3.9%. Should I just keep bumping up the injector flow rate until I reach 0?

[AaronGTR]

Still working on adjusting fueling myself but, I do know you'll never get the LTFT's to a perfect zero. Most people say if you get them to average +/- 2 then you are doing really good. Are you using HPtuner or DHP Tom? I don't remember. I'm not sure how the guys on the hp forum do things, but the dhp guys say to usually get the LTFT close by adjusting the injector flow rate so you may need to still drop them a bit. Then adjust for fueling at different rpm using a MAF spread sheet. Since you have stage2 heads and cam and larger injectors you might benefit from doing some VE tuning. I'm planning on doing that on my car, but haven't had a chance to read up on the process yet. It involves driving the car in speed density mode with the MAF unplugged.

[tejohnson]

I would assume HPTuners due to the header:

Vehicle Type: Pontiac Grand Am (V6) 2003
Creation Date: 6/15/2006 2:10 PM
Notes:

[Markers]

[Data]


If you try to get fuel trims less than +/-5 you will end up driving yourself insane since it is likely to be off again when the weather changes...

Looks like ya have a little bit of a lazy 1-2 shift [80-83].

It also looks like your PE activation is occuring at the stock 70%

To quench some of the KR, you might try moving PE activation down a bit, and adding a bit more to the MAF (rather than tuning fuel trims by injector flow rate).

1-2 degrees of KR can happen at times... 8 degrees is somewhat concerning...

[xxbackhillxx]

Thanks for the input. I'm still trying to figure out how to tune all of the things you mentioned.

1-2 shift doesn't concern me. Right now it feels better than it ever has. I know there is room for improvement, but I'd rather concentrate on the fuel and knock problems for the moment.

[Sprucegagt]

First thing you need to do is get your LTFT trim to lock at 0 when you activate PE. It can be a pain but it is possible. In your scan your pulling 3% of fuel from your WOT calculations. This is a big reason for the KR your seeing. Also getting your trims within +/- 5 on a N/A car is not hard. Hell you can get it within +/- 2 with a little effort. My trims are almost there. Take a look.

I take it you know that - LTFT readings mean your running rich.

[xxbackhillxx]

Yea I figured that my knock was due to running too rich. During my 1/4 mile runs my fuel trims would lean out once I hit 3rd gear and the knock practically disappeared.

And I know that -LTFT's are rich ;) I can read the scans and see whats wrong, the problem with me is idk how to get into the tuner and adjust everything accordingly. I read on the forums, but it's so hard.

edit: forgot to mention the problem with my software. When scanning, if you notice the last column, the calculated cylinder airmass, reads 0 on the histogram. I'm wondering if you guys think it's a software problem or if it's something mechanical/electrical with the car.

[xxbackhillxx]

Just went into the PE mode... PE enable kicks in at 55% tps lol. I definately thought I had it set higher...

[xxbackhillxx]

To quench some of the KR, you might try moving PE activation down a bit, and adding a bit more to the MAF (rather than tuning fuel trims by injector flow rate).

Sorry if this sounds stupid, but how would I go about this? What do I do with the PE and MAF tables?

[Sprucegagt]

He means you should have PE activate a little bit sooner. Plus increase the g/sec values on your MAF table when you are at WOT. Since you don't have a spreadsheet to help with this adjustment. I would change it 1 % at a time and creep up on it.

[tejohnson]

Well, to add on. If you look at the scan, when you are going into PE, your fuel trims are already in the negative, and lock in trimming fuel. I have never really been a fan of tuning the LTFT with the IFR values. Rather, it may be better to leave them stock, and lock your trims in with the MAF work. Regardless, your going into PE pulling fuel, and you get instant KR...

Just my thought tho. Doesn't mean I am right ;)

[AaronGTR]

I kinda think getting the trims closer to zero using the IFR table, at least at idle, is a good thing. You obviously can't use that to get your trims right at other throttle points, but I would think getting it close at idle would give you a better number to start with, the idea being if the pcm has a injector pulse width that is closer to correct at various throttle percentages then the amount of correction you need to do with the MAF would be lower. At least that seems logical to me. I know what seems like it should work and what actually does aren't always the same thing in tuning though so maybe I'm way off. :)

[SPAZ]

What are you guy's tuning with.
I have the dhp with the tuner they sell. i bought it 2 or 3 years ago.

What's New ???

[botlfed]

SPAZ, hptuners has software available to do tuning just like DHP.....

[AaronGTR]

What are you guy's tuning with.
I have the dhp with the tuner they sell. i bought it 2 or 3 years ago.

What's New ???


How'd you do that? It wasn't available 2-3 years ago. You could get a DHP pcm but the DHP powrtuner for the grand am only came out last winter.

[tejohnson]

Technically it was in October ;)

But official 11/19/04 @ 04:51 EST lol

[AaronGTR]

Right right... lol


Well you got one before most of us 'cause you were beta testing for GA's weren't you? I know they were out for grand prix's for a while before we could get them because I kept emailing them about it and they kept saying not available yet. I didn't finally get mine until late summer almost fall iirc. Ordered it from ZZP on 4/25/05.

[tejohnson]

lol... Well, that is the date Charles closed incident #1 in the bugtracker.... which happend to be mapping of a 99 gagt calibration. ;) I was the first GA, not the first 3400....

[Sprucegagt]

And thank you for getting the 99 GA calibration mapped. It has been helpful to me.