Engine/Transmission (1998.5 - 2002) timing for 24 v

[zstroken]

Does anyone know how much timing the edge comps and edge comp drags add?? How much timing can the cummins handle?? Thanks

 

[Hohn]

I don't know anyone who's put them on the scope to see how much timing is added.



Moreover, the 24V trucks do not have constant timing. The ECM varies based on APPS, MAP and a bunch of other inputs. For example, timing at steady cruise is MUCH more advanced than under maximum load.



I think the ECM varies timing by as much as 8 degrees. I don't remember where that number came from.



You might want to try to PM user MARCO-- he's about the most knowledgeable on here about the ECM and how it affects/controls the VP44.



The Cummins can "handle" a lot of timing... some of the pullers are nearing 30degrees!. A street-driven truck should be not even half of that.



Because the ECM varies timing with varying conditions, the Edge boxes tend to also have a varying amount of timing. If I am remembering right, the Edges will let the ECM advance timing when it normally would (and even add additional advance) but they limit how far they will let the ECM back off the timing.



That's why I discourage the use of the EZ on ETH engines when combined with monsters injectors and especially drugs (NOS, propane, etc). The HUGE peak cylinder pressures that result from the advanced timing will take out a headgasket pretty quick, and the ETH is more vulnerable because it has a bit more compression (17:1 vs 16. 4:1)



Justin

 

[fyrescott]

Hohn, you have me worried about injectors now. I want to put injectors in but reading your post I'm thinking this might be a bad idea. What about mild injectors????

 

[Mad Bomber]

Big one's

So what's considered a large injector? I have DDII's and a drag comp,with a PDR35

 

[Bob Wagner]

Edge EZ and injectors make a great combination. Which combination?



What do you want to do? The options are limitless

 

[Mad Bomber]

Bob, you going to be up at BP this weekend?

 

[A Johnson]

Injection timing varies from approximately TDC to 30* before TDC, according to Cummins ISB Virtual College.



My guess is the stroke of the timing piston inside the VP-44 does not allow it to move beyond 30* BTDC. Therefore the timing boxes would only allow it to advance sooner, or perhaps more correct way to say it is to remain in an advanced state longer.



A Johnson

 

[zstroken]

besides high cylinder pressures??

Besides popping a head gasket(already done that) what else would happen to the engine?