Which parameters do "tuners" play with for cam changes?
Thread Starter
Joined: Nov 2001
Posts: 10,060
Likes: 33
From: Canton, GA
Which parameters do "tuners" play with for cam changes? Seems like I see lots of posts saying, "This cam will require custom tuning." What is tuned? Is it just the A/F tables? Timing tables?
Is that where all the power lies? I'm a little miffed about where all this hidden power is in the tuning. I am way behind the curve on this tuning stuff. What am I missing?
Is that where all the power lies? I'm a little miffed about where all this hidden power is in the tuning. I am way behind the curve on this tuning stuff. What am I missing?
Re: Which parameters do "tuners" play with for cam changes? Todd...patience my son <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> I have no idea as to your answer. I'm still trying to find out what parameters are set to LOCK the ltrims at 0 on my turbotech car. Sooner or later I figure i will screw up and unlock them <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> I am loving ls1edit so far. I think they are probably just leaning things out in the lower rpm range to give back some throttle response and help with idle. What injectors are you dialing in? I have yet to see a discussion on injector offset. im wondering if brand/type of injectors affect these values.
Thread Starter
Joined: Nov 2001
Posts: 10,060
Likes: 33
From: Canton, GA
Re: Which parameters do "tuners" play with for cam changes? See my other post about LTrims. Got it figured out somewhat, I think <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" />
Todd
Todd
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Joined: Nov 2001
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From: College Station, Tx
Re: Which parameters do "tuners" play with for cam changes? In closed loop there is really nothing you can do as far as fuel - other than trying to get the l-trims under control.
WOT fueling you can use the PE vs RPM table
if you need to control fueling at idle (some big cam cars like it a little richer than stoich) you can set your TPS to enable WOT to 0 for the 0-1600 or so range - this will put you in PE mode at idle and disable learning. You can then use the PE vs RPM table to control fueling at idle.
Quite a bit of the part throttle tuning will be in the spark advance table - changing the values as well as the shape can have a marked impact on throttle response, etc. Fueling is pretty well handled by the MAF, and is dynamic, so changes aren't normally required (at part throttle). The timing tables are relatively static with respect to different engine combinations, so quite a bit of improvement can be done here.
I would tackle the car as three areas - idle, part throttle, wot. Once you have those down to your satisfaction you can focus on other more esoteric cases (cold startup, etc.)
Chris
WOT fueling you can use the PE vs RPM table
if you need to control fueling at idle (some big cam cars like it a little richer than stoich) you can set your TPS to enable WOT to 0 for the 0-1600 or so range - this will put you in PE mode at idle and disable learning. You can then use the PE vs RPM table to control fueling at idle.
Quite a bit of the part throttle tuning will be in the spark advance table - changing the values as well as the shape can have a marked impact on throttle response, etc. Fueling is pretty well handled by the MAF, and is dynamic, so changes aren't normally required (at part throttle). The timing tables are relatively static with respect to different engine combinations, so quite a bit of improvement can be done here.
I would tackle the car as three areas - idle, part throttle, wot. Once you have those down to your satisfaction you can focus on other more esoteric cases (cold startup, etc.)
Chris
Thread Starter
Joined: Nov 2001
Posts: 10,060
Likes: 33
From: Canton, GA
Re: Which parameters do "tuners" play with for cam changes? Thanks Chris! Looks like I need to start over and take the correct steps this time. I will go back to the original file and start with addressing LTrims/idle, then WOT A/F, then play with timing curves.
Todd
Todd
