How to tune for a cam

[smokin6.5l]

hey guys i need some help tuning for my cam that i just installed in my 2002 chevy 2500HD with the 8.1L v8 the cam is a comp cams xr270HR. i am going to upload a tune and my logged data for some advice to help me out or point me in the right direction. any info is very much appreciated as i have posted this on many sites with very little responses.
8.1L Tune 4.tun
8.1llog data tuning.efi

[Taz]

The answers are the same as they were the last time you posted …

http://forum.efilive.com/showthread.php?14959-need-help!!!!

Please read the AutoVE and CalcVE tutorials. These would have been downloaded to your computer with the EFILive software – probably to C:\Program Files\EFILive\V7.5\Doc. In this directory you will find the Tune Tool manual, Scan Tool manual, and about a dozen *.pdf Tutorials.

Also, there are also numerous threads on this Forum that discuss – step by step – what you are trying to do.

After some self-education, if you at least attempt the AutoVE or CalcVE exercise, and at that point you come back to the Forum with questions, members are more likely to respond.

I know you don’t yet have a wideband O2. You can probably adjust the lower RPM / load portion of your tune reasonably well using the CalcVE method. A wideband O2 is really a necessary and indispensible tool to an accurate tune.


Regards,
Taz

[smokin6.5l]

i read them and im having trouble making the pids i dont know how to create a pid

[WeathermanShawn]

Smokin:

I really am not that familiar with your vehicle and OS, so I may not be much help either.

Is it just computer applications that is giving you fits on the PID, or conceptually how to tune a cammed vehicle? What Pid are you referring to?

A few notes on your Tune & Log. I see you are running closed-loop with MAF-Enabled. Thats a lot of channels (Pids) you are logging. Most of us keep it to 24 channels or less depending on OS.

I see no wideband....Also your LTFT's are very negative. You might look into the CALC.VE Table threads/Tutorials for adjusting the MAF via LTFTBENS. Joecar and myself just worked a fellow member through a similar situation this last week.

Also I noticed 3.8 degrees of KR. Thats where the wideband will help out.

Cammed vehicles usually need more Desired Airflow, modifications to the MAF and VE Table, and Spark. Do you have your Idle nailed down yet?

Plenty of online threads/Tutorials. The forum is pretty slow this time of year. I have written a few Tutorials on Idle and CALC.VE (co-authored). Let us know what is hanging you up and we will try to help you if possible...

[joecar]

For the tutorial pdf and calc pids, see post # 169: showthread.php?13152-New-Tuning-Tutorial-WeathermanShawn&p=120121

Just follow Shawn's tutorial, it shows how to create maps...

and use the calc_pids.txt (copy it to My Documents\EFILive\V7.5\User Configuration).

[smokin6.5l]

The truck starts just fine when it is cold and it will keep running and not shut off. But when its been running awhile and i go to restart it it will start up right away but it will shut off almost as fast as it is started up.So when its warm i have to give it throttle to keep it running and slowly drop the idle and it will stay running that way. After it is running it seems to run just fine it just doesnt like to stay running when started warm. The reason i am running with the MAF on is becuase im not sure how to turn it off without unplugging the damn thing. I have looked at the CALC_VE Tables tuturial and they are kinda confusing to me, so any help here would be appreciated too.

[WeathermanShawn]

While the Calc.VE Table is written at a beginner's level, it really sounds like you might have just started your 'self-education' on tuning.

Even before I began tuning I read as many books, threads, and forums as possible. I spent over two months reading before I even posted on this forum. You should at least try the CALC.VE Table method. It is really very easy. Then post up your Tune & Log if you run into difficulties.

If you find you are running into 'computer applications' problems, review all the EFILive Scan and Tune Tutorials. Try just one thing at a time.

I don't know what else to advise. The more you try to accomplish on your own, the more you learn. Otherwise you can start with a mail-order tune through an accomplished Vendor.

Have you tried anything yet on your own?

[smokin6.5l]

well i will re read the calc ve table and i will do some more data logging i am a beginner but i have written a couple tunes already its not that and if i have any troubles i will re post here and i when i am done data logging and trying to figure out a tune i will post it up and see what you guys think of it

[smokin6.5l]

ok so i had some time to do some data logging and some tuning with my truck this weekend and this is what i came up with i have attached my log info and my tuning file that i am running for now it seems to work okay but if someone could look at them and give me some advise that would be appreciated

[WeathermanShawn]

smokin:

It looks O.K., except you did not do the necessary PIDs for the CALC.VE Table to compute.

I have attached the PIDS that are shown in the Tutorial. Do not exceed 24 channels! Why are you logging so much?

1. You need LTFTBENS.
2. You need DYNAIRTMP.DMA

I assume you do not have a wideband?

Smokin, you really need to follow the Tutorial. The Pid selection is crucial. You don't have any CALC.VE Values to comment on.

Otherwise a few comments on your Tune and Log. On the positive side it does appear your overall LTFT's are good. KR is minimal. On the negative side it looks like you have maxed out your injectors at a relatively low RPM..100% at 4598 Rpms.

So, in summary. Get ride of all the unnecessary PIDS (they slow down the Scan Tool). Use the exact PIDS described in the Tutorial.

Good luck..