Loss of power/jerk somewhere between 45-55? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

G.E. · 05-25-2011, 04:11 PM

anytime i romp on it from a low speed and it hits about 50 I guess I'm switching a gear, however it pauses and then resumes acceleration. U have the torque pushin you back then you have a large gap and you actually get pushed forward and then it kicks back in. It doesn't do it on any other gear. I have a predator tune on my car, could that have anything to do with? if so what parameter do i need to adjust?

any comments are appreciated. thanks!

O and my car is an Automatic (L99).

LS7 427 · 05-25-2011, 04:51 PM

I'd say your bouncing off the rev limiter when shifting from 2nd to 3rd. Your probably spinning the tires in 2nd and the revs get up there real fast.

Ron66Vette&10SS · 05-25-2011, 07:18 PM

Is it with Traction Control on, off, or in "Comp Mode?

My first guess would be that it's probably your traction control kicking in when your car is making the 1-2 shift.

slickmetal · 05-25-2011, 07:19 PM

Quote:

Originally Posted by G.E.

anytime i romp on it from a low speed and it hits about 50 I guess I'm switching a gear, however it pauses and then resumes acceleration. U have the torque pushin you back then you have a large gap and you actually get pushed forward and then it kicks back in. It doesn't do it on any other gear. I have a predator tune on my car, could that have anything to do with? if so what parameter do i need to adjust?

any comments are appreciated. thanks!

O and my car is an Automatic (L99).

Try turning off ALL traction control...hold down the TC button for about 7 seconds...then give it a go...with your tune and/or mods might be making the car think the wheels are going to spin more than usual so the TC pulls timing then gives it back...I hope this works for you.

slickmetal · 05-25-2011, 07:20 PM

Quote:

Originally Posted by Ron66Vette&10SS

Is it with Traction Control on, off, or in "Comp Mode?

My first guess would be that it's probably your traction control kicking in when your car is making the 1-2 shift.

hehe great minds think alike in the same minute...

Snake Slayer · 05-25-2011, 07:45 PM

Sound like your tune is off a bit. Had a similiary issue and my shift point needed to be tweaked. Is this happening in D or M?

G.E. · 05-25-2011, 08:10 PM

to answer the questions. it is in Drive. and everything is regular, traction control on and NOT in comp mode. and i don't think my wheels are slipping to be honest.

Ron66Vette&10SS · 05-25-2011, 08:21 PM

Quote:

Originally Posted by G.E.

......traction control on and NOT in comp mode. and i don't think my wheels are slipping to be honest.

Either turn everything off, like slickmetal suggested, or if you want to leave active handling on but have the Traction Control off, just momentarily push the TC button once. I think you'll be pleasantly surprised on the 1-2 shift

Quote:

Originally Posted by slickmetal

hehe great minds think alike in the same minute...

You got that right, even more so when I saw you're Air Force.

What's your AFSC? I was a KC-135 Crew Chief for 20 years.......retired in 2007. I was TDY at DM when I dropped off my last "A" model (56-3621) at the boneyard in '94 with barely 10,000 hours on it.....what a waste of a perfectly good Tanker....sad day :flag1:

Snake Slayer · 05-26-2011, 08:04 AM

Quote:

Originally Posted by G.E.

to answer the questions. it is in Drive. and everything is regular, traction control on and NOT in comp mode. and i don't think my wheels are slipping to be honest.

It sound like something is amiss in your tune. Are you working with a local tuner or did you do a mail order. Also are you using HP tuner, EFI Live or SCT?

JANNETTYRACING · 05-26-2011, 08:05 AM

Quote:

Originally Posted by G.E.

anytime i romp on it from a low speed and it hits about 50 I guess I'm switching a gear, however it pauses and then resumes acceleration. U have the torque pushin you back then you have a large gap and you actually get pushed forward and then it kicks back in. It doesn't do it on any other gear. I have a predator tune on my car, could that have anything to do with? if so what parameter do i need to adjust?

any comments are appreciated. thanks!

O and my car is an Automatic (L99).

What your Feeling is Transmission torque management, unfortunately there are no parameters to adjust with a Predator.

It is Best to return the car to stock and sell off your Predator and Purchase an SCT X3 from me then I can tune your Engine and Transmission to Perfection and give you the Performance you expect out of your L99.

Ted.

05-25-2011, 04:11 PM	#1
G.E. Drives: black on black twenty ten ss/rs Join Date: Jul 2009 Location: Texas Posts: 428 View My Garage	Loss of power/jerk somewhere between 45-55? anytime i romp on it from a low speed and it hits about 50 I guess I'm switching a gear, however it pauses and then resumes acceleration. U have the torque pushin you back then you have a large gap and you actually get pushed forward and then it kicks back in. It doesn't do it on any other gear. I have a predator tune on my car, could that have anything to do with? if so what parameter do i need to adjust? any comments are appreciated. thanks! O and my car is an Automatic (L99). __________________ I GOT MINE! Where's yours? :(

05-25-2011, 07:18 PM	#3
Ron66Vette&10SS Plays with Hot Wheels Drives: '17 Jet Black ZL1 Join Date: Apr 2010 Location: Derby, Kansas Posts: 849	Is it with Traction Control on, off, or in "Comp Mode? My first guess would be that it's probably your traction control kicking in when your car is making the 1-2 shift. __________________ Previous Cars: '78 Z28, '92 Z28, '95 Z28, '85 Corvette, '01 SS, '96 Z28, '04 Z06 Corvette, '10 SS, '13 SS Hot Wheels Current Cars: '17 ZL1(daily driver), '04 Trailblazer (rain & snow), '66 Corvette (restoring)

05-25-2011, 07:45 PM	#6
Snake Slayer Drives: Awaiting 2014 C7 Join Date: Sep 2009 Location: Sunshine State Posts: 902	Sound like your tune is off a bit. Had a similiary issue and my shift point needed to be tweaked. Is this happening in D or M? __________________ Awaiting 2014 C7

05-25-2011, 08:10 PM	#7
G.E. Drives: black on black twenty ten ss/rs Join Date: Jul 2009 Location: Texas Posts: 428 View My Garage	to answer the questions. it is in Drive. and everything is regular, traction control on and NOT in comp mode. and i don't think my wheels are slipping to be honest. __________________ I GOT MINE! Where's yours? :(

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05-25-2011, 04:51 PM	#2
LS7 427 10.11 @ 136.32 Drives: Black & Yellow 2SS/RS LPE LS7 427 Join Date: Mar 2010 Location: Redcliff, Alberta Posts: 957 View My Garage	I'd say your bouncing off the rev limiter when shifting from 2nd to 3rd. Your probably spinning the tires in 2nd and the revs get up there real fast.