Forum Discussion
ShinerBock wrote:
I am sure the engine is fine revving at 5k as long as the oil cooler and radiator can keep up that much of a sustained load/heat(some modern gasers can't). I just don't want to hear it. I had to in my 4.6L and it was teeth chattering to hear it scream up and down the hills for 150 miles. Although if you are revving that high for such long periods of time on a regular basis then I would do the severe duty cycle in preventative maintenance.
I would have put it in manual and forced a downshift, and yes it needs 4:10's and a 10 speed.
Then again, 4:10's may have left it screaming at 5500 rpm on that climb depending upon the gear spread and whether it could pull the next one. I totally agree that 10 gears would be great, so much so that 4:10 wouldn't even be needed any more.ls1mike wrote:
ShinerBock wrote:
ls1mike wrote:
ShinerBock wrote:
There should be a caveat with N/A gaser tow ratings such as you loose X pounds of rating every Y feet above elevation instead of just saying it can tow 16,000 lbs. Unless doing 25 mph at 5,000 rpm without any power to pass is your idea of towing.
At the end of the test they were going 2600 RPM at 25 mph. Truck wouldn't downshift. I wonder what would have been different if they put it in manual. To be honest I never put mine in manual, but I have not towed the IKE.
They were screaming at 5,000 rpm most of the way when they were taking the noise measurement and they lost speed when it up-shifted until they got too low and it downshifted to high rpms again. In order to maintain a decent speed, it would have needed to be in the upper 5,000 rpm. That is not my idea of towing. GM should decrease the tow ratings for that altitude.
It was and 5000 RPM is fine for a gasser. That is what they are designed to do. I know some people are uncomfortable with that.
The problem is the further they went the lower rpms went and by the time they hit the top they were at 2600 rpm. I don't know why it wouldn't down shift. In manual you could have. I don't know what algorithm GM is using for down shifting. Thing also needs 4.10s.
I am sure the engine is fine revving at 5k as long as the oil cooler and radiator can keep up that much of a sustained load/heat(some modern gasers can't). I just don't want to hear it. I had to in my 4.6L and it was teeth chattering to hear it scream up and down the hills for 150 miles. Although if you are revving that high for such long periods of time on a regular basis then I would do the severe duty cycle in preventative maintenance.
I would have put it in manual and forced a downshift, and yes it needs 4:10's and a 10 speed.Grit dog wrote:
Well if they weren’t using the right gear then that is part o the issue.
2600rpms uphill at altitude with a big trailer? ROFL. Double that and that’s about where she should be running for that exercise.
Yeah it goofy. For some reason the truck didn't shift. It did the same thing in the 2017 video I posted. If you shift to manual you can keep it right where it needs to be. You are right the truck needs at least 4.10sShinerBock wrote:
ls1mike wrote:
ShinerBock wrote:
There should be a caveat with N/A gaser tow ratings such as you loose X pounds of rating every Y feet above elevation instead of just saying it can tow 16,000 lbs. Unless doing 25 mph at 5,000 rpm without any power to pass is your idea of towing.
At the end of the test they were going 2600 RPM at 25 mph. Truck wouldn't downshift. I wonder what would have been different if they put it in manual. To be honest I never put mine in manual, but I have not towed the IKE.
They were screaming at 5,000 rpm most of the way when they were taking the noise measurement and they lost speed when it up-shifted until they got too low and it downshifted to high rpms again. In order to maintain a decent speed, it would have needed to be in the upper 5,000 rpm. That is not my idea of towing. GM should decrease the tow ratings for that altitude.
It was and 5000 RPM is fine for a gasser. That is what they are designed to do. I know some people are uncomfortable with that.
The problem is the further they went the lower rpms went and by the time they hit the top they were at 2600 rpm. I don't know why it wouldn't down shift. In manual you could have. I don't know what algorithm GM is using for down shifting. Thing also needs 4.10s.ls1mike wrote:
ShinerBock wrote:
There should be a caveat with N/A gaser tow ratings such as you loose X pounds of rating every Y feet above elevation instead of just saying it can tow 16,000 lbs. Unless doing 25 mph at 5,000 rpm without any power to pass is your idea of towing.
At the end of the test they were going 2600 RPM at 25 mph. Truck wouldn't downshift. I wonder what would have been different if they put it in manual. To be honest I never put mine in manual, but I have not towed the IKE.
They were screaming at 5,000 rpm most of the way when they were taking the noise measurement and they lost speed when it up-shifted until they got too low and it downshifted to high rpms again. In order to maintain a decent speed, it would have needed to be in the upper 5,000 rpm. That is not my idea of towing. GM should decrease the tow ratings for that altitude.ls1mike wrote:
They tested a 2017 2500HD 6.0 6 speed 4.10s with 13,500
2017 2500HD 13,500lbs on the Ike
Long story short. 13 brake applications on the way down. 10:20 to get to the top.
Thanks. It is hard to get a good idea from their site what trucks and weights they have tested.
I know they want you to watch the videos but I really wish they would compile all the information once a year or after a few months for easy comparison.- Well if they weren’t using the right gear then that is part o the issue.
2600rpms uphill at altitude with a big trailer? ROFL. Double that and that’s about where she should be running for that exercise. ShinerBock wrote:
There should be a caveat with N/A gaser tow ratings such as you loose X pounds of rating every Y feet above elevation instead of just saying it can tow 16,000 lbs. Unless doing 25 mph at 5,000 rpm without any power to pass is your idea of towing.
At the end of the test they were going 2600 RPM at 25 mph. Truck wouldn't downshift. I wonder what would have been different if they put it in manual. To be honest I never put mine in manual, but I have not towed the IKE.parker.rowe wrote:
They definitely went all out with the weight. As far as I can tell the last gasser test they did was 11K lbs.
16K is a big trailer for a gas truck at that elevation.
I'm not surprised it slowed down as much as it did at the top. Especially since it refused to downshift...they said it held the gear all the way down to 2000rpm. The 6.6 is a little bigger than the 6.0, but the torque peak is still at 4000rpm.
I'll be curious to see how the old 6.4 Hemi with the new 8speed does with that kind of weight. Probably not well. Defiantly looking forward to the new Ford 7.3 test as well.
They tested a 2017 2500HD 6.0 6 speed 4.10s with 13,500
2017 2500HD 13,500lbs on the Ike
Long story short. 13 brake applications on the way down. 10:20 to get to the top.- There should be a caveat with N/A gaser tow ratings such as you loose X pounds of rating every Y feet above elevation instead of just saying it can tow 16,000 lbs. Unless doing 25 mph at 5,000 rpm without any power to pass is your idea of towing.
