Exhaust brake

[Ricky]

(06-05-2021 )Rawze Wrote:  

(06-05-2021 )Ricky Wrote:  ...
So Rawze, is there a too much on the boost when jakeing hard?.
...

The ISX uses the turbo to set the strength of the engine brakes. If it is set too strong then it can lead to disaster in a hurry for someone.

If someone's engine is de-mandated and has bad delete programming, it is often the case where some jerk-weed jacked with the engine brake settings. If so then Yes.. it can drop a valve during heavy jake operations + high rpm, due to valve closing delay caused by excessive exhaust back-pressures.

Newer engines with their higher compression ratios cannot handle as much back-pressures as the older engines do. - This however does not mean that their engine brake is weaker. If anything the opposite is true, as a higher compression makes for more resistance during jake operations.

As far as what is "safe" .. different engines have different upper-end ratings on this. Like others have pointed out, CM870's typically cap at about 28 psi, CM871's, a bit less that that, and newer CM2350's etc... its even slightly less. For most people ... if their engine brake programming has not been played with ... They should not normally have to keep an eye on their jake boost pressures while going down a hill unless they suspect something is wrong.

Jerry did the tune when they did the inframe. It has been doing very well since the inframe. I have been running really hard, infact I've got just over 30000 miles on it already. Jerry said he can adjust the tune if needed when I bring it back around 50000 miles. I haven't let it go to see how high it goes because I don't want to mess anything up. I didn't want to tear up an engine needing rebuilding I surely don't want to tear up a new inframe.