Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
Cold Air Inductions
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Engine | Drivetrain | Powertrain Technical Discussions > Tuning / Diagnostics -- engine and transmission

Tuning / Diagnostics -- engine and transmission Tune and diagnostics for engines and auto transmission.

Reply
 
Thread Tools
Old 01-23-2013, 05:19 PM   #1
AiRDawG
 
AiRDawG's Avatar
 
Drives: 2011 Camaro 2SS
Join Date: May 2011
Location: Maryland
Posts: 224
RPM stutter in 3rd

So this is a little bit delayed, but I had my 2011 L99 professionally tuned about a year ago, and have been 99.5% satistfied with the results. My .5% comes from an almost unnoticeable RPM "stutter," and only in 3rd. It only happens at 70%+ throttle, and only for an instant before resuming normal output and acceleration.

I don't track the car, so it's not losing me any races, but it's finally bothering me enough to dive into it. I thought it was trans torque management, and since I have a copy of HPT myself, went as far as tuning all my trans settings back to stock. The issue is still there, so it must be in the engine torque management. Any ideas on where to look? The comparison feature of HPT - comparing my tune to a stock tune - has waaaaay too many changes for me to figure it out by process of elimination, I'm afraid.

I'll try to get a scan of it happening and post it here. Stand by!
__________________
AiRDawG is offline   Reply With Quote
Old 01-24-2013, 11:04 AM   #2
JANNETTYRACING
PRESIDENT CALIBRATOR JRE

 
JANNETTYRACING's Avatar
 
Drives: YELLOW 2013 ZL1 AUTO
Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 9,143
Quote:
Originally Posted by AiRDawG View Post
So this is a little bit delayed, but I had my 2011 L99 professionally tuned about a year ago, and have been 99.5% satistfied with the results. My .5% comes from an almost unnoticeable RPM "stutter," and only in 3rd. It only happens at 70%+ throttle, and only for an instant before resuming normal output and acceleration.

I don't track the car, so it's not losing me any races, but it's finally bothering me enough to dive into it. I thought it was trans torque management, and since I have a copy of HPT myself, went as far as tuning all my trans settings back to stock. The issue is still there, so it must be in the engine torque management. Any ideas on where to look? The comparison feature of HPT - comparing my tune to a stock tune - has waaaaay too many changes for me to figure it out by process of elimination, I'm afraid.

I'll try to get a scan of it happening and post it here. Stand by!

Full list of Mods Please.
__________________
Technical information, Parts Sales, Professional Installation, and Custom Dyno Tuning.
Please vist our web sites for all your performance needs!
Ted Jannetty
Jannetty Racing Ent Inc.
2984 East Main St.
Waterbury Ct. 06705
203-753-7223
tedj@jannettyracing.com
www.jannettyracing.com
www.turboaddictionparts.com
Performance Parts
JANNETTYRACING is offline   Reply With Quote
Old 01-24-2013, 11:20 AM   #3
AiRDawG
 
AiRDawG's Avatar
 
Drives: 2011 Camaro 2SS
Join Date: May 2011
Location: Maryland
Posts: 224
ARH 1 7/8" Longtube Headers with gutted cats
Vararam Intake (tune model)
Dyno Tuned

I can post my HPT file if it might help.

It snowed last night so i wasn't so worried about getting the scan i promised... might try today though
__________________
AiRDawG is offline   Reply With Quote
Old 01-24-2013, 11:32 AM   #4
JANNETTYRACING
PRESIDENT CALIBRATOR JRE

 
JANNETTYRACING's Avatar
 
Drives: YELLOW 2013 ZL1 AUTO
Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 9,143
Quote:
Originally Posted by AiRDawG View Post
ARH 1 7/8" Longtube Headers with gutted cats
Vararam Intake (tune model)
Dyno Tuned

I can post my HPT file if it might help.

It snowed last night so i wasn't so worried about getting the scan i promised... might try today though
TR6 Plugs?
__________________
Technical information, Parts Sales, Professional Installation, and Custom Dyno Tuning.
Please vist our web sites for all your performance needs!
Ted Jannetty
Jannetty Racing Ent Inc.
2984 East Main St.
Waterbury Ct. 06705
203-753-7223
tedj@jannettyracing.com
www.jannettyracing.com
www.turboaddictionparts.com
Performance Parts
JANNETTYRACING is offline   Reply With Quote
Old 01-24-2013, 11:41 AM   #5
AiRDawG
 
AiRDawG's Avatar
 
Drives: 2011 Camaro 2SS
Join Date: May 2011
Location: Maryland
Posts: 224
Quote:
Originally Posted by JANNETTYRACING View Post
TR6 Plugs?
Nope, stock plugs
__________________
AiRDawG is offline   Reply With Quote
Old 01-24-2013, 01:02 PM   #6
JANNETTYRACING
PRESIDENT CALIBRATOR JRE

 
JANNETTYRACING's Avatar
 
Drives: YELLOW 2013 ZL1 AUTO
Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 9,143
Quote:
Originally Posted by AiRDawG View Post
Nope, stock plugs
Probably in the tune.

Ted.
__________________
Technical information, Parts Sales, Professional Installation, and Custom Dyno Tuning.
Please vist our web sites for all your performance needs!
Ted Jannetty
Jannetty Racing Ent Inc.
2984 East Main St.
Waterbury Ct. 06705
203-753-7223
tedj@jannettyracing.com
www.jannettyracing.com
www.turboaddictionparts.com
Performance Parts
JANNETTYRACING is offline   Reply With Quote
Old 01-24-2013, 02:32 PM   #7
AiRDawG
 
AiRDawG's Avatar
 
Drives: 2011 Camaro 2SS
Join Date: May 2011
Location: Maryland
Posts: 224
Thanks Ted! Here's my HPT file if you or anyone else feels like having a look at my tune.
Attached Files
File Type: zip jan2013.zip (2.78 MB, 11 views)
__________________
AiRDawG is offline   Reply With Quote
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:52 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.