Bill's 02 Z-28 SS

Hi folks
I need some help - I have the HP Tuners package for the 2002 f-body. I have modified my 02 with ported LS6 heads & cam plus other mods. I have used the software to modify the IFR for my 36 lbs fuel Injectors - wasn't bad, followed other people's suggestions.
Here is my problem - I would like to start out with a LS6 PCMtables and modify it. Right now I have to modify on my LS1 PCM and not total sure what or how to start. If I could see a LS6 tables and compare it to my LS1, then I could see what I needed to be modifiy and how much - then I adjust it from that point.
Does any know where I can get a 2002 LS6 PCM or tables???
Thanks - any help would greatly be appreciated.
Bill

goodhands

Bill, my experience is with LS1edit but I am assuming they function in a similar fashion. Having stated that, you should reconsider copying the LS6 tables to your LS1. These setups are very different. The MAF table is different because the LS6 has a different MAF and such the timing tables are lower. I think you will see negative results using the LS6 timing table. There is plenty of great advice on this forum and you will get all the help you will need to adjust your LS1 tables. You may look like this after making such a drastic change as the above mentioned.

Let me start by asking what drivability issues are you having? Then, what performance issues do yo have?

Bill's 02 Z-28 SS

Good Morning Goodhands,
Actually the car drives great under normal driving conditions - I am very surprised. I expected problems but none. Under WOT, the low end is sluggish but after 3G it pulls hard. With my setup which also includes SLP LT headers & CATS and large MAF. The LS6 ported heads have a compression ratio of 11.2:1.
I am look for the maximum performance I can get out to this combination.
Bill

goodhands

Have you logged some basic parameters on a scanner yet? If so, how is part throttle fueling, WOT timing, Inj DC, MAF hz at WOT, KR etc...?

Greg

jimmyblue

iTrader: (11)

You want the MAF table that corresponds to your
85mm MAF. Which may or may not be anything like
the Z06 MAF. Before you jump into wholesale changes
this is the thing to get right.

If this is an SLP MAF, then you may just stick with
the stock table for now. But on my vehicle, with a
somewhat modified SLP, I find that the MAF output
is "flatlining" at about 10KHz well before redline, and
well below the nominal limit of the truck MAF core's
output and the PCM's input. I am getting suspicious
that the "calibration" by resistor costs top-end
fidelity and will eventually be converting over to a
descreened straight truck MAF to try that out.

The LS6 heads should not make for big changes.
Less timing perhaps, only if you get into KR. The
headers may give you some work to do with idle.

At any rate I think you should stick with your LS1
base, and work methodically at the differences from
that rather than jumping to a LS6 motor calibration
set.

Bill's 02 Z-28 SS

Hi Folks
First - I have logged some data and discovered my LTFT is very high - doing 60mph, the number is from +14 to +16. I have to adjust my IFR Table again. I used the formula for to calculate it for 36 lbs injectors but it appears the number is too high. At 0 it was 5.1, the new number is 4.14 based on the LTFT numbers.
Also the MAF is a Granatelli housing using my sensor. I believe it is an 82MM and does not have a screen or center bar. I have not adjusted anything for the MAF. I was under the impression that you start with the Fuel Injectors first - that could be wrong.

Bill

Gary Z

Jimmyblue is correct. An accurate MAF table is fundamentally important. You essentially have a ported (uncalibrated) MAF. If you start with an inaccurate MAF table it will very difficult to interpret your efforts. You should change to a stock (unmodified) MAF sensor. Calibration tables have been posted for all of the different stock MAF sensors.

-Gary

Bill's 02 Z-28 SS

Hi Folks
Ok - I am going to reinstall the stock MAF, I will restart from that point. However, I do have one question, after reading many posting about MAF, I notice everybody is talking about a 1K resistor - where does the resistor go and I assume it fakes out the computer? Why not a variable resistor and dial it in if you take that approach?
Bill

samz28

mechanical parts are prone to failure, moisture, and heat variance. co_pot's are not exception. they will wander. whether that means anything to your case i dunno, but whats the point if you got the tools to do it in software?

jimmyblue

iTrader: (11)

Yes, pots are not "launch grade", vibration can
unseat the wiper etc. In my MAF tuning (SLP
MAF, I am merely changing the resistor value)
I started w/ a pot, went to DIP switches and
eventually decided that it wasn't really any
more difficult to just keep the little "doghouse"
and solder in new values. I have several posts on
here about that.

No idea if the GMAF would respond the same to
that kind of tweak. I think you'd be better off to
sell it for what you can get (never mind the
karmic consequences) and get a truck or Z06 MAF,
if you must have 85mm, because these you can
get a proper, factory cal table for; then you have
one less unknown in the system.

Bill's 02 Z-28 SS

Hi Jimmyblue
Thanks - I reinstalled the stock MAF and lower the IFR to 4.2 @ 0. My LTFT appears to be about 4 to -4, I need to run it for awhile which I did not do tonight. I will tune the car with the stock MAF and then think about what to do for the MAF. I will log some more data and look at the LTFT.

By the way, we fly some our systems with pots - they have to withstand a lot of vibration and other things - full MIL.
Bill