Engine Bogging Under Full Throttle or Something Else? - Cobalt SS Network



Problems/Service/Maintenance Do you have problems with your new 2.0, 2.2, or 2.4L? What kind of service did you have done?

Reply
 
 
 
Thread Tools Search this Thread
Old 09-12-2017, 04:54 PM   #1
Senior Member
Thread Starter
 
Join Date: 08-04-06
Location: Canada
Posts: 829
Thanked 2 Times in 1 Post
Engine Bogging Under Full Throttle or Something Else?

Hi all,
I have a very low mile LSJ, just 60.5K on it, it's a 2006 non-lsd.

I have noticed that when in 5th gear, particularly when the car is going uphill when there's higher strain on the engine, that if I floor the gas in 5th at around 2800 RPM (I never would floor it below this) there appears to be a "marbles in the transmission" sound. Is this the engine bogging? Clutch chatter, or some other issue?

If I raise the RPMs to 3200 or so, then floor it in 5th, on the same hill the noise does not appear. It only appears if I floor it below 3K.

Other than this noise I have not noticed any drivetrain issues at all. Transmission and clutch work exactly as expected.

Any experiences with this would be appreciated
boostbalt is offline   Reply With Quote
Old 09-12-2017, 05:25 PM   #2
Senior Member
iTrader: (1)
 
Join Date: 02-03-16
Location: Kansas
Posts: 1,583
Thanked 51 Times in 48 Posts
That's called lugging your engine and you shouldn't do it. Use your RPM range. You do much more harm lugging an engine than you would revving it out. That sound that resembles marbles in a can is most likely your engine pinging/knocking telling you you are running too much timing/boost for the load and rpm.

Nothing is wrong with your engine yet hopefully but driver mod is needed. Next time you feel like flooring it in 5th gear with the rpms below 3,000 rpm, DON'T without downshifting.
jdbaugh1 is offline   Reply With Quote
Old 09-12-2017, 10:54 PM   #3
Senior Member
Thread Starter
 
Join Date: 08-04-06
Location: Canada
Posts: 829
Thanked 2 Times in 1 Post
Quote:
Originally Posted by jdbaugh1 View Post
That's called lugging your engine and you shouldn't do it. Use your RPM range. You do much more harm lugging an engine than you would revving it out. That sound that resembles marbles in a can is most likely your engine pinging/knocking telling you you are running too much timing/boost for the load and rpm.

Nothing is wrong with your engine yet hopefully but driver mod is needed. Next time you feel like flooring it in 5th gear with the rpms below 3,000 rpm, DON'T without downshifting.
Understood, I wonder why flooring it in second at this RPM doesn't cause issues... Is it due to the fact the revs climb faster in second and I'm not noticing the lugging?

I should have learned this a long time ago. The issue is that the lugging occurs not too often, and I didn't figure out it was below 3000 rpm on hills and below 2800 on the flat roads. Plus it's a bit different for each gear.

But I'm thankful for your advice and welcome the peace of mind.

Cheers!
boostbalt is offline   Reply With Quote
Old 09-13-2017, 07:48 AM   #4
Senior Member
iTrader: (1)
 
Join Date: 02-03-16
Location: Kansas
Posts: 1,583
Thanked 51 Times in 48 Posts
It's all about load. In 5th gear at 2,800 rpm WOT on flat ground you are putting WAY more load on the engine than in 2nd gear at 2,800 rpm on a hill. When you need that extra power, use those gears and don't be afraid to get close to redline.
jdbaugh1 is offline   Reply With Quote
Old 09-13-2017, 08:36 AM   #5
Senior Member
 
Join Date: 06-10-12
Location: Manitoba, Canada
Posts: 2,610
Thanked 42 Times in 41 Posts
cluelessk is offline   Reply With Quote
Old 09-13-2017, 08:53 AM   #6
Platinum Member
Platinum Member
iTrader: (6)
 
Join Date: 07-19-10
Location: Denver, Colorado
Posts: 17,836
Thanked 260 Times in 229 Posts
Quote:
Originally Posted by cluelessk View Post
This should be a sticky in almost every subforum here.
ECaulk is online now   Reply With Quote
Old 09-13-2017, 09:27 AM   #7
Senior Member
iTrader: (1)
 
Join Date: 02-03-16
Location: Kansas
Posts: 1,583
Thanked 51 Times in 48 Posts
jdbaugh1 is offline   Reply With Quote
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:42 AM.