What speed should exhaust brk stop

[Wygate]

I seem to remember that the EXH BRK was set to turn off at 15mph (2009/ 6. 7 mega cab), and that is what I remember it doing. It now stops at 25mph (give or take a few, I am driving after all), I am noticing it more now as I am doing a good bitt of logging road driving in the mountains, where 10mph is a big deal.

If it is working as was set can it be made to be more aggressive?



Thanks

 

[rwitt]

Mine turns off at 20 mph 3rd gear. 2nd gear turns off at 25mph. As far as I know there is no adjustment according to the tech at the dealer.

Rich

 

[Hoefler]

If you have the tow/haul mode on and down shift manually, it will do to about 15mph in second gear. It will go as long as the converter stays locked up.

 

[2Rowdy]

IIRC it turns off at either second gear or 1100 rpms which ever comes first.

 

[d6c]

Mine has never worked in first or second gear and is totally rpm dependent... . kicks out at 1100 rpms.

 

[Hoefler]

Worked yesterday coming down a steep grade with 5ver in tow, second gear just under 15 mph.

 

[Wygate]

Thanks guys, I was starting to think it was changed by one of the flashes that was done, but it sounds like it is just fine.

I did just read an article on guys putting this turbo on a 5. 9 with a rheostat to control how aggressive it is, don't remember where I read it.

 

[Cosmo]

There's a company making a stand alone controller for it, but since you've got the controls in the ECM it would be nicer to use the stock computer.

I'd like to be able to make the exhaust brake more aggressive - have the stock amount for "winter" driving (well, off for winter, stock for rain, and up a notch for dry).

Call H&S, maybe they know how to tweak it along with the trans programming.

 

[WarEagleDiesel]

Straight from shop manual:



EXHAUST BRAKE FUNCTION



The VGT works in conjunction with the engine and the transmission to provide an integrated braking system used to help slow the vehicle. This is commonly called exhaust braking. This braking power is achieved by modulating the turbo sliding nozzle ring to restrict the flow of exhaust gases from the engine, which in turn creates a high back pressure on the engine. The high back pressure creates a high level of resistance to the motion of the pistons within the engine and this resistance is used to reduce engine speed and thus vehicle speed.



The exhaust brake feature will only function when the driver turns the exhaust brake switch to the on position. Once the switch is in the on position and the vehicle is moving faster than 8 k/h (5 MPH); the exhaust brake will automatically operate when the driver removes pressure from the throttle pedal allowing the engine to see 0% throttle and 0 fuel delivery.



Exhaust braking is most effective when the engine RPM is higher. The automatic transmission has been programmed to downshift more aggressively when the exhaust brake is enabled to increase brake performance. Use of automatic transmission Tow/Haul Mode improves interaction between the engine and transmission. Inputs to the exhaust brake feature include:



Coolant temperature

Ambient air temperature

Exhaust manifold pressure sensor

Throttle pedal position sensor

Fault codes with any of these sensors will cause the exhaust brake feature to be disabled.



The exhaust brake feature can also be used to reduce the engine warm up time. To use the exhaust brake as a warm-up device, the vehicle must be moving less than 8 k/h (5 MPH), the exhaust brake switch must be in the on position, and the coolant temperature must below 82°C (180° F) and ambient temperature below 15. 5°C (60° F).



My amateur opinion:



- Operation appears to be more dependent on RPMs than MPH. Therefore, since you are operating with an automatic transmission, you may want to manually control your gear selection on you shift column.



- To improve operational effectiveness, operate in two/haul mode.



- Finally, make sure you do not have any fault codes present. Fault codes can affect EB operation.

 

[d6c]

From my 3 plus years and 60k miles..... Must be in 3rd gear or higher AND must have 1100 rpm's or higher or there is no exhaust brake function to be had.

 

[Cosmo]

Mine works in 2nd.

 

[mxaaron]

I can't speak for you guys with the auto transmission's but on the manual, it operates down close to idle. It is not gear dependant either. Works in all of them.

 

[d6c]

You guys with manual transmissions are lucky then, would love to have my automatic rig work in first or second, also. Have read that the manual trans. rigs go down to 900 rpm's before the brake kicks out, that would also help the auto trans. rigs out, too... .

 

[JHumphries]

You guys with manual transmissions are lucky then,...

Gotta love manual transmissions Oo.

 

[DBithell]

just a suggestion that might offer more aggressive response:



the stainless steel tube that runs from the back of the exhaust manifold -

where it connects at the front top of the engine there is a pinhole that can get sooted up, has a sensor above it - think it meausres exhaust pressure/temp



have cleaned mine a couple of times and after cleaning exhaust brake seems stronger



appologies for my lack of technical vocabulary on this, but does help.



'08 mega

 

[AABEN]

Well mine does jest grate on the 6 speed stick. It payed for it self when I came down the AZ side of I-8 from CA to AZ. I will never have a diesel with out one,

 

[Lonestar Buckeye]

mine works in every gear down to 1100rpms. . i use it all the time around sharp corners and for general stopping. . went to state park in maine and on down grades used 1st gear and eb so i could sightsee a little.



07. 5 3500 crew cab 3. 73 4x4 w auto

 

[Texas Ted]

Mine works well in all gears!

 

[DBents]

IIRC, on the automatics the reason for it kicking out at 1100 RPM is that is where the torque converter un-locks. Exhaust braking with the torque converter unlocked is very hard on the trans.