Engine/Transmission (1998.5 - 2002) comp, dd2s, and housing ???

[AMeissner]

i have an 01. 5, with edge comp. Bought DD2s also, havent installed them yet. After reading a post by Hohn about timing and cylendar pressure https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=85927&perpage=15&pagenumber=2



Now, my concern is will i be doing harm by running the comp (wire tapped) with the DD2s? Also, i am planning to replace the housing with either a 14cm WG or 16cm NWG to keep power up but egts down. I use this truck to tow cattle trailer, what would be my best bet? Are DD2s too large of injectors to run with a comp due to timing and cylendar pressure.

thanks in advance

 

[Hohn]

Well, I think you would be just fine with the Comp and DD2s. i am still concerned about excessive timing on the EZ, but i think it's more of a case where it's "not optimal" as opposed to going to hurt something. There are a LOT of guys running the Edge boxes with DD2s or 3s, and NEVER have I heard of one grenading from excessive timing.



If you REALLY work the engine, I suppose you could hurt something. But lots of guys abuse their trucks with silly loads, and I haven't heard of a CTD failing.



I run the EZ and DD2s. While I feel the timing to be a hair too much, I have to ask myself a couple questions:



1) Why Did Diesel Dynamics feel the need to tone down the timing on their flavors of the Edge boxes?



2) Why doesn't TST use a similar approach by bumping up timing?



In the end, i don't think that the COMP and dd2s is any worse than an EZ and dd2s. This is because the comp adds a secondary injection pulse AFTER the main one. So the big boost in power comes with an event of retarded timing.



While I feel that my combo of EZ and 2s is NOT optimized, I am starting to be fairly confident that it is safe. If it were NOT safe, I believe we would have heard something about it by now.



Sorry! I didn't mean to scare anyone. I was just trying to find out why some things are the way they are, and vent my own fears a bit.



Justin

EDIT: i should mention that the higher compression ratio of the ETH engines makes them a little more aggravated by the advanced timing. You don't say which engine you have, so take it FWIW. I personally would think that the optimum timing for an ETH would be different than for an ETC, given their different compression ratios, injectors, and pumps. So if the EZ or a similar box was developed on one engine, it almost certainly is not optimized for the other. Now you go and add injectors, and everything is all skewed. Since my truck is an HO, it's probably the worst case scenario, and all seems to be holding up just fine.

 

[mgoncalves]

Originally posted by Hohn

\Now you go and add injectors, and everything is all skewed.

Especially if you get injectors with a somewhat high popoff pressure. Then you want all the timing that the Edge box has to offer.







You will be fine with the comp and 2's, your clutch won't be if it's still stock.



Matt

 

[Sticks]

HEY! Transmission anyone? If it is an auto, guess what won't live long. Manual, mgoncalves ran for quite a while on his stock clutch, but it still died.

 

[Fueler]

Originally posted by mgoncalves

Especially if you get injectors with a somewhat high popoff pressure. Then you want all the timing that the Edge box has to offer.





Matt

i thought the timing induced by the DD injectors was due to a LOWER popoff pressure.

 

[CFAR]

Others on this site have posted that by increasing fueling, you are in effect increasing timing

 

[Hohn]

I am still on my stocker clutch, but it's a sure bet that if I tapped the wire, that clutch would be vapr in no time.



JLH

 

[mgoncalves]

Originally posted by Fueler

i thought the timing induced by the DD injectors was due to a LOWER popoff pressure.

Not all performance injectors have such a low popoff point. With a higher setpoint you sacrifice how long your injector is open, but make up for it with better atomization and a cleaner burn.





Matt

 

[AMeissner]

any housing recomendations?

 

[mgoncalves]

Originally posted by Hohn

I am still on my stocker clutch, but it's a sure bet that if I tapped the wire, that clutch would be vapr in no time.



JLH

Justin, with your ETH, your clutch will suffer more from the EZ's timing induced low end burst. Don't expect to gain a whole lot with tapping your pump wire, I've heard something like 40 horse on an ETH is about all you'll get. That's with stock injectors, but you still don't get much more than heat by tapping the pump wire on an ETH. Us ETH guys are forced to go big on the showerheads for our big power gains.





Matt

 

[mgoncalves]

Originally posted by AMeissner

any housing recomendations?

If you do 4" exhaust and a 16 housing, you will be able to keep the EGT's in check when towing. That's assuming you turn down the comp as needed.