Tuning issue, problem found?

Redog · 05-13-2013, 03:56 AM

OK Took the car to the track today to see what the 3.29 FDR would do in the 1/4 mile. One good run, spinning for about 10-20 feet put down a 15.151@88.81, I think the spinning cost me about .3 seconds easy. The car has only had 3 14 second passes at this track. The other track, it's only had 5 15 second passes, well you get the idea.

The 15.15 run, WB read 12.2-12.6 the entire lenght of the track so I was

The other two. Missing like crazy. stumbling, have to get off of it and back in it. Finally past the 1/8 mile point, missing stops, car goes, runs low 17's one time and high 17's the second.

Looking at some tunes on HPTuners and one Alero guy, has more work done to his car, has a stock MAF (I have the LS1 MAF, which I will change back to stock) and his Delta flow + and - are .3, .6 and 1.2 or something like that. Both of mine are 66.141 across the board.

Air cyl pressure is a bit different, but this guy is bored out with a hot cam, I'm stock bore and stock cammed. MAP was kinda weird where I was higher than him at a low RPM, but lower than him at a high RPM.

I was thinking about coping his Delta flow and see what I get. Only looked at those 3 things. I had to get ready for work and I knew I wasn't tuning before I left.

Thoughts?

If you don't know, please don't respond. Not trying to be a prick, but I just want to get this fixed before I blow the engine, or my top

Redog · 05-13-2013, 02:24 PM

bump bump

Nas Escobar · 05-14-2013, 03:43 AM

You might want to ask this on an engine forum... not to be mean or anything, but you did say "If you don't know, please don't respond" and the fact of the matter is that most of us don't know much about mechanical, since we learn as we go.

sleepyalero · 05-14-2013, 10:13 AM

B888 will probably chime in, or mmgt1, maybe mfuller to.

Free bump.

Redog · 05-15-2013, 12:04 AM

I emailed Fuller on FB, he responded. He's going to get back to me.

Quote:

Originally Posted by Nas Escobar

You might want to ask this on an engine forum... not to be mean or anything, but you did say "If you don't know, please don't respond" and the fact of the matter is that most of us don't know much about mechanical, since we learn as we go.

Yeah, I don't want to sound mean, but just like AOTM pic posting, I don't want to go thru 150 post of guys saying "Oh man that sucks" I know it sucks, and everybody reading knows it sucks, I just want to get it fixed

Nas Escobar · 05-15-2013, 01:13 AM

I agree, but when people read that, people usually assume that you wouldn't take guesses, so if someone said "well maybe it's a faulty MAF" it would be assumed that you would be mad about that.

WhiteV6 · 05-15-2013, 01:00 PM

Remember when I told you it wasn't the tune? That is still true.

Redog · 05-15-2013, 07:15 PM

I remember you saying it was the O2 sensor.

Your tune is still in place.

Swapped in the stock MAF and now the car still leans out a little bit, very little, but when I floor it, it's running 11.3 one time, the other 11.7, until I get off the gas. After doing some reseach, I found that boosted guys may or may not need to upgrade their MAF. I'm still NA, so....yeah

WhiteV6 · 05-15-2013, 07:48 PM

I got an email that they added one of the tables I needed but not the trans shift pressure with MAF disabled....couldn't find it. Um...well unless your computer is special compared to every other N body, I am at a loss but HPTuners is all we have for support so that is what we deal with.

Your issue is not in the tune. There is still tuning to do of course, but it isn't the reason you drop out of PE mode at full throttle or that your O2 reads max rich or max lean randomly. Shit, I have a trans tune for you to try when we get the engine done

Its a totally different car with the trans settings changes Gerson had done.

falloutboy · 05-16-2013, 07:56 AM

ok, I have no clue about HPTuners program, but I may be able to help if I get the info I need.
And especially no abbreviations

as these tend to mean something different to everybody.

Got some graphs of what happens during ur run down the 1/4mile?

Redog · 05-17-2013, 02:49 AM

Quote:

Originally Posted by WhiteV6

I got an email that they added one of the tables I needed but not the trans shift pressure with MAF disabled....couldn't find it. Um...well unless your computer is special compared to every other N body, I am at a loss but HPTuners is all we have for support so that is what we deal with.

Your issue is not in the tune. There is still tuning to do of course, but it isn't the reason you drop out of PE mode at full throttle or that your O2 reads max rich or max lean randomly. Shit, I have a trans tune for you to try when we get the engine done

Its a totally different car with the trans settings changes Gerson had done.

I've looked at the O2 wiring and didn't see anything wrong, but if you are convinced that there is something going on in that area, I'll shoot over to my mech's shop and let him look at it. Maybe it's something down low that you can really only see on a lift

Floor it again today and guess what happened? Getting so effing pissed at this point, as in so pissed that a trade-in is in order

falloutboy · 05-17-2013, 07:10 AM

if it would be the o2, coudnt u look at ur data of it via HPTuners to see if it worked correctly or where it went wrong?

WhiteV6 · 05-17-2013, 10:49 AM

id guess ground or power issue, not necessarily the O2 wiring itself. Id also suspect an exhaust leak as a possible problem.

AleroB888 · 05-17-2013, 12:46 PM

Quote:

Originally Posted by falloutboy

if it would be the o2, coudnt u look at ur data of it via HPTuners to see if it worked correctly or where it went wrong?

Whatever the problem is, yes, a scan would be fundamental information to have.

jackal2000 · 05-17-2013, 01:47 PM

Is your air filter in good shape?

Redog · 05-17-2013, 08:09 PM

Air filter is pretty good. Exhaust leak? Maybe at the headers. I have the stock metal gaskets on the rear and 1 or 2 ports on the front, going to remove and paint my headers and put the metal gaskets in place. I had the paper gaskets in place but they kept blowing out. There is one paper gasket left

Taking the car to my mech. I'll mention the ground and power issues as possibllies. He said he's never dealt with anything like this, but has heard of it. He asked how old my TPS was right off the bat.

WhiteV6 · 05-18-2013, 11:30 AM

looking at the logs again....put your stock MAF back in. The MAF reading drops, then it drops out of PE mode.

falloutboy · 05-18-2013, 01:16 PM

if your TPS work, could be easily checked by a "Rauschprüfung" - but I have no clue how's it called in english.

Whats PE mode?
MAF reading drops, meaning what? The voltage drops or the signal fades out?

WhiteV6 · 05-18-2013, 01:59 PM

TPS works fine. Power Enrichment is what commands a richer AF ratio. It goes from 12.2 to 15.7 right after the MAF drops down in its reading of air flow, then starts pulsing horribly while KR increases and AF ratio remains 15.7. I can post a screen shot if Redog doesn't care.

Oddly enough, he does some more wide open and its fine other than some light KR. Starts pulling off the throttle slowly and all the other readings react accordingly. Not sure what the wideband was reading the entire time but I am sure that is where it is tunable vs a physical issue. Could be the MAF, could be the amount of straight pipe before and after still, or something else. I hope we have the basics covered right now at least. Send another log any time

Redog · 05-22-2013, 01:06 PM

Ben, feel free to post a screen shot, I'm fine with that.

My mech also said O2. He coiuldn't get the car to act up, go figure, but he said my O2 was reading a little weird .

With his scanner an what Ben has been saying, I stopped at Advanced on the way home and expalined the problem. They are going to swap out the sensor for me, it will come in tomorrow. O2 sensor is only 6 weeks old