Why does my GT fluctuate power? Cats off or on?
08-02-2010, 11:44 PM
#1
Thread Starter
Join Date: Aug 2010
Location: TN
Posts: 18
Why does my GT fluctuate power? Cats off or on?
I've noticed ever sense I bought my 05 GT (stock) that some days my car runs better then others. I was just wondering if these cars are known to do that? Also I'm thinking about drilling out the cats will I get any extra power from it? I've read mixed reviews
Mods are
Tuneable Induction intake
cat back x pipe flowmaster
xcal 3 - Breenspeed 93 tune
Mods are
Tuneable Induction intake
cat back x pipe flowmaster
xcal 3 - Breenspeed 93 tune
08-03-2010, 07:05 AM
#4
6th Gear Member
These engines heat soak something fierce. Your sense of power differences may be a result of that.
You may lose some low end torque from losing the cats. Others will confirm (or deny).
You may lose some low end torque from losing the cats. Others will confirm (or deny).
08-03-2010, 07:09 AM
#5
6th Gear Member
Join Date: Jul 2008
Location: Acworth, GA
Posts: 12,260
08-03-2010, 09:40 AM
#6
Thread Starter
Join Date: Aug 2010
Location: TN
Posts: 18
Interesting ok. Well I don't want to lose any power so maybe I need to look into doing something else - any ideas?
would hi-flow cats be worth my while to get the sound but not losing any power in the process?
08-03-2010, 11:34 AM
#7
3rd Gear Member
Join Date: Mar 2006
Location: New Hampshire
Posts: 854
These cars absolutely drive differently day-to-day. I agree with Nuke about the heat soak being a major factor, but I also think there's more to it. Some days it drives like a beast, other days not so much. I attribute it to the "smart" PCM....
08-03-2010, 11:50 AM
#8
4th Gear Member
Join Date: Mar 2006
Location:
Posts: 1,470
Heat definitely adversely affects the power output of these engines as others have noted.
But the owner's driving habits also affect power. Drive conservatively, and it will feel sluggish. Drive aggressively, and it will feel peppier. You can also disconnect the battery for 30 min., which wipes out the ECM's memory of your driving habits and improves performance.
But the owner's driving habits also affect power. Drive conservatively, and it will feel sluggish. Drive aggressively, and it will feel peppier. You can also disconnect the battery for 30 min., which wipes out the ECM's memory of your driving habits and improves performance.
08-03-2010, 12:12 PM
#9
Thread Starter
Join Date: Aug 2010
Location: TN
Posts: 18
But the owner's driving habits also affect power. Drive conservatively, and it will feel sluggish. Drive aggressively, and it will feel peppier. You can also disconnect the battery for 30 min., which wipes out the ECM's memory of your driving habits and improves performance.
This seems extremely dumb to me!
There has to be a tune out there that addresses this issue and will tell the ECM "HEY! STAY AGGRESSIVE WHEN HE FLOORS IT!!" Doesn'T seem hard to me but I'm not a tuner. maybe someone can enlighten me on this
08-03-2010, 12:33 PM
#10
6th Gear Member
Some of the tuners claim that their tune eliminates the Adaptive Learning. I, personally, don't believe that it totally eliminates all of the settings that result in poor performance. It certainly is a work-around but if you do it and notice a difference, then resetting the PCM every few months is not that big of a deal.