Car feels sluggish few days after tune
04-28-2009, 08:10 PM
#1
3rd Gear Member
Thread Starter
Join Date: Mar 2005
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Posts: 940
Car feels sluggish few days after tune
Just wondering if anyone else has noticed that after installing a performance tune on your s197 gt and driving it for a few days that it starts to feel sluggish after awhile, when i first upload my tune the car feels fast and peppy but after driving a few hundred miles the car feels as if it looses some of its pep. any ideas?
04-28-2009, 08:25 PM
#2
2nd Gear Member
Join Date: Jun 2007
Location: Windermere/Orlando, FL
Posts: 357
I notice this too, it is very frustrating.. If you don't run it hard all the time the cars pcm uses that adaptive learning and i guess adjusts the tune? I tried it out, drove it slow for a good amount of time/miles.. and then from a dig, my tires were barely able to spin(06 GT automatic).. I went home, got my tuner, re-tuned it.. Tried the same little test, and my car spun all through first, and caught grip in middle of 2nd.. That tells me right there it learns to adjust to your driving..?
I just reload my tune after a few weeks or if i notice it to get sluggish.. You can feel a huge difference, at first i thought i was making crap up in my head and it wasn't really sluggish but after the re-flash it brought it to my attention i wasn't making it up.. lol..
You are not the only one to experience this, many on my other forum have made threads of this..
I just reload my tune after a few weeks or if i notice it to get sluggish.. You can feel a huge difference, at first i thought i was making crap up in my head and it wasn't really sluggish but after the re-flash it brought it to my attention i wasn't making it up.. lol..
You are not the only one to experience this, many on my other forum have made threads of this..
04-28-2009, 09:05 PM
#3
3rd Gear Member
Join Date: Sep 2006
Location: Lewisetta, Virginia
Posts: 788
I have a Brenspeed tune with a Granatelli CAI. RPMs below 2000 seem pretty weak. Weaker than stock in my opinion. Between 2000 & 3000 seems about like stock. But, after 3000 the tune is strong. I'm wondering what setting in the options we could set the tune to be stronger at low rpms. I experience this in all 3 of my tunes...87,91 or 93. I've only had the tune for about a week or so. When the engine is cold the tunes seem to run a little less smooth than stock. After it warms up things smooth out. I've still got to spend more time with each tune though. With any of the tunes when I stomp it from 1st to 2nd the tires spin a lot more than stock. With stock I only got a small chirp. They almost fishtail now with these tunes. So, overall it's been a little weak at low rpms but kick butt at higher rpms.
04-28-2009, 10:15 PM
#4
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Join Date: Nov 2006
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I notice this too, it is very frustrating.. If you don't run it hard all the time the cars pcm uses that adaptive learning and i guess adjusts the tune? I tried it out, drove it slow for a good amount of time/miles.. and then from a dig, my tires were barely able to spin(06 GT automatic).. I went home, got my tuner, re-tuned it.. Tried the same little test, and my car spun all through first, and caught grip in middle of 2nd.. That tells me right there it learns to adjust to your driving..?
I just reload my tune after a few weeks or if i notice it to get sluggish.. You can feel a huge difference, at first i thought i was making crap up in my head and it wasn't really sluggish but after the re-flash it brought it to my attention i wasn't making it up.. lol..
You are not the only one to experience this, many on my other forum have made threads of this..
I just reload my tune after a few weeks or if i notice it to get sluggish.. You can feel a huge difference, at first i thought i was making crap up in my head and it wasn't really sluggish but after the re-flash it brought it to my attention i wasn't making it up.. lol..
You are not the only one to experience this, many on my other forum have made threads of this..
04-28-2009, 10:37 PM
#5
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Join Date: Mar 2006
Location: New Hampshire
Posts: 854
Well I'm certainly not the authority on this, but I believe there was decent thread on this site explaining the difference between the stock tune and the custom tunes as far as adaptive learning is concerned. I believe the general idea is that the stock tune can adapt in both closed loop (idle, part throttle) and as well as open loop (WOT). The custom tunes usually have the adaptive learning disabled in open loop, so at least when you go WOT the computer won't mess with you. However, closed loop will still be affected by adaptive learning over time, which is what I believe you guys are experiencing.
04-28-2009, 10:56 PM
#6
2nd Gear Member
Join Date: Jun 2007
Location: Windermere/Orlando, FL
Posts: 357
Well I'm certainly not the authority on this, but I believe there was decent thread on this site explaining the difference between the stock tune and the custom tunes as far as adaptive learning is concerned. I believe the general idea is that the stock tune can adapt in both closed loop (idle, part throttle) and as well as open loop (WOT). The custom tunes usually have the adaptive learning disabled in open loop, so at least when you go WOT the computer won't mess with you. However, closed loop will still be affected by adaptive learning over time, which is what I believe you guys are experiencing.
Does this have to do with the fact that the car is flashed and its not a new performance pcm with a dyno tune?
04-29-2009, 12:04 AM
#7
2nd Gear Member
Join Date: Dec 2006
Location: USA
Posts: 434
I have a Brenspeed tune with a Granatelli CAI. RPMs below 2000 seem pretty weak. Weaker than stock in my opinion. Between 2000 & 3000 seems about like stock. But, after 3000 the tune is strong. I'm wondering what setting in the options we could set the tune to be stronger at low rpms. I experience this in all 3 of my tunes...87,91 or 93. I've only had the tune for about a week or so. When the engine is cold the tunes seem to run a little less smooth than stock. After it warms up things smooth out. I've still got to spend more time with each tune though. With any of the tunes when I stomp it from 1st to 2nd the tires spin a lot more than stock. With stock I only got a small chirp. They almost fishtail now with these tunes. So, overall it's been a little weak at low rpms but kick butt at higher rpms.
04-29-2009, 07:14 AM
#8
6th Gear Member
Well I'm certainly not the authority on this, but I believe there was decent thread on this site explaining the difference between the stock tune and the custom tunes as far as adaptive learning is concerned. I believe the general idea is that the stock tune can adapt in both closed loop (idle, part throttle) and as well as open loop (WOT). The custom tunes usually have the adaptive learning disabled in open loop, so at least when you go WOT the computer won't mess with you. However, closed loop will still be affected by adaptive learning over time, which is what I believe you guys are experiencing.
My thoughts exactly. Lift one of the battery leads for about 20-30 minutes to reset the adaptive learning. You do not need to reload the tune after that. Simply reloading just the tune does not reset all of the parameters that are causing the return to a less aggressive engine response.
04-29-2009, 09:10 AM
#9
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Join Date: Mar 2007
Location: Deep in the <3 of Tx
Posts: 3,925
I have a Brenspeed tune with a Granatelli CAI. RPMs below 2000 seem pretty weak. Weaker than stock in my opinion. Between 2000 & 3000 seems about like stock. But, after 3000 the tune is strong. I'm wondering what setting in the options we could set the tune to be stronger at low rpms. I experience this in all 3 of my tunes...87,91 or 93. I've only had the tune for about a week or so. When the engine is cold the tunes seem to run a little less smooth than stock. After it warms up things smooth out. I've still got to spend more time with each tune though. With any of the tunes when I stomp it from 1st to 2nd the tires spin a lot more than stock. With stock I only got a small chirp. They almost fishtail now with these tunes. So, overall it's been a little weak at low rpms but kick butt at higher rpms.
I felt the same way when I had a Brenspeed tune. Above 3K is was awesome, but below that it was more sluggish than stock. What really sucked is when I had to take off from a stop on an incline. With the Brenspeed tune, it felt like the car didn't want to go.
This is not the case with my Bama tunes, especially the race tune. Starting off from an incline with the Bama tune is a complete 180. The car wants to launch me over the incline. LOL
I know that these engines really start waking up after 3K which is why Brenspeed concentrates there. But I'd rather have most effort put from 1K to 4K. That would be better for the street.
04-29-2009, 09:24 AM
#10
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Join Date: May 2007
Location: NW Arkansas
Posts: 13,322
+1
My thoughts exactly. Lift one of the battery leads for about 20-30 minutes to reset the adaptive learning. You do not need to reload the tune after that. Simply reloading just the tune does not reset all of the parameters that are causing the return to a less aggressive engine response.
My thoughts exactly. Lift one of the battery leads for about 20-30 minutes to reset the adaptive learning. You do not need to reload the tune after that. Simply reloading just the tune does not reset all of the parameters that are causing the return to a less aggressive engine response.
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