I just finished my cam install and I need help tuning for it. I have LT1 Edit now where do I start? I installed the cc 224/230 springs, lifters the whole nine plus what is in the sig. I don't know a whole lot about tuning but I have LT1 Edit. Can anyone please help me or send me a bin file to start from. I appreciate any help.
Thanks,
Jayme

 

Start with the idle. I have tunercat so the tables my be called something different in Edit.

Set the "IAC idle in-park" values to 1100rpm for everything below 68 degrees coolant temp and 1000rpm for everthing above 68 degrees coolant temp. Then set the IAC idle "in-gear" to 1000rpm below 68 degrees and 900rpm above 68 degrees.

Then increase the idle timing in the 800 to 1100 rpm range. Called "closed TPS vs spark timing" in Tunercat. I raised mine to 32 degrees. This really help with it running rich and all the gas smell at idle.

Download DataMaster from the net and you can use it 20 times before the timeware expires. Log some idle time and see what you IAC counts are and the TPS voltage and post them along with your BLMs and MAP readings. Let the car run for awhile so at least the pcm has time to learn though.

That should give u something to start with.

 

Awesome, I will do that. Thank you so much for your help!
Jayme

 

Someone please correct me on this...
In LT1 Edit this is called Idle Speed vs. Temp. (F)
Adjustments are Temp./RPM
IN GEAR: -40/800, -19/800, 3/800, 24/800, 46/800, 68/800, 89/800, 111/800, 132/750, 154/650, 176/550, 197/550, 197/550, 219/550, 240/550

I need to change to :? -40/1000, -19/1000, 3/1000, 24/1000, 46/1000, 68/1000, 89/900, 111/900, 132/900, 154/900, 176/900, 197/900, 197/900, 219/900, 240/900

IN NEUTRAL: -40/1200, -19/1200, 3/1200, 24/1000, 46/950, 68/900, 89/900, 111/900, 132/850, 154/750, 176/650, 197/650, 197/650, 219/650, 240/650


I need to change to :? -40/1100, -19/1100, 3/1100, 24/1100, 46/1100, 68/1100, 89/1000, 111/1000, 132/1000, 154/1000, 176/1000, 197/1000, 197/1000, 219/1000, 240/1000

In LT1 edit I think this is "Closed Throttle Spark Advance"
The adjustments are RPMs/Spark Adv.
0 /0.0, 400/20.0, 800/20.0, 1200/30.0, 1600/34.0, 2000/34.0, 2400/34.0, 2800/35.0, 3200/37.0, 3600/37.0, 4000/37.0, 4400/37.0, 4800/37.0

SO I need to change 800/20.0 to 800/32.0 and 1200/30.0 to 1200/32.0?

Does that all sound right?
Thanks again and I will run those tests after I get this programed
Jayme

 

Yes; that is all correct.
The fun is just beginning.
JD

 

woo whoo

Oh the fun.

I will do this probably today. Anything I need to know about using the Datamaster program? I downloaded it yesterday.

 

The only strange thing I found with running Datamaster was that you need open and then save the file name to windows BEFORE you actually start recording not after you are finished.

FILE->OPEN->Name it and save it to where ever-> then hit the record button.

Opening a file that is not there seems strange to me but that's how it works.
I expected it to record first then after I was done it would ask what to call the file for saving. Maybe its just me though but it took me awhile to firgure this out. I was so use to naming files AFTER I downloaded them, etc. that I couldn't get datamaster started.

The Help file explains this but who reads that.

 

I am in the same boat as poorman. Any more juicy tidbits? I have a M6 - what would you do different?

 

I modified the "Closed Throttle Spark Advance" as described above, and my car ran terrible. I backed out the change. My car runs a little rough at idle, so maybe it didn't need much tune there. My big problem is that on the freeway, at say 75MPH, I can't go to 6th gear - the car doesn't seem to enough torque or HP. It gets real rough. I have to stay in 5th and I am shifting much higher RPM in all gears than before. Before my engine mods, I could stay in 6th down to 50 MPH without much trouble. Any thoughts?

 

Closed tps advance is different then when the engine is under load. I retarded timing from were you say our problem is.

First; have you ran a log to see where your fuel is at will at this point? That needs to be correct first. You may be pig rich up top.

If your fuel BLMs looked good I would SUBTRACT from the "main" spark table in the range where the problem seems to be. Look at the MAP and RPM range were the problems is then subtract timing in that range. Say for example 1000-2000rpm and MAP 30-55 is what datamaster reports. I would start with subtracting 6.0 degrees in all those blocks to see if that helps.

btw, I have up to 7.5 degrees of retard from stock in my main spark table in this rpm/map range. In the "middle" of the table about 2 degrees retard and then it works up as much as 10 degrees advance in the high map/rpm ranges.

 

I did a little more research on bin files and found an Ed Wright stock heads, Hot Cam tune bin file. Would this tune be a good starting point for my cam (224/230) or not a good Idea?

If so, how do I make all the changes that were made under my own lt1 edit file? In other words this tune was for a different car with different vin and it had a 6 speed tranny. My car has an auto. Make sense?

 

I think I have that file and there is not much changed from stock besides idle stuff. Anyway; as long as the timing tables look in range (below 40 or so) and the fuel constant is ok, I would try it and log a run. You just want to be sure its not screwed with to made the car go boom.

Tunercat let's you "compare" two different bins. This lets you see only the difference (-2, +3, -1, etc) so you can zero out everything which makes it the same as the compared bin file. I compared a copy of my stock bin to a modded bin and zero it out. This is an easy way to move stuff over to a bin that has your vin, trans, etc. I do not know if Edit has this. I would assume it has or at least something similiar in some way. If not; then it's a slow process coping everthing over.

 

LT1edit has the same feature. You need to go to each individual table to compare that table with the other file. It can be tedious. I wish it would give indications at the high level that something below is different so that you can navigate only to the differences. Pity. Are there any compare tools out there that do this? Does somebody have a table that describes the table locations in the EEPROM image? If so, I could write a quickie compare utility that would print the names of the tables and if the were the same or different from a reference file.

 

PoorMan you have mail.
Thanks,
Z

 

Send me your LT1 edit file that you downloaded from your PCM and I will send you a base calibration.