Engine/Transmission (1994 - 1998) Added 16CM housing and BHAF, now egt's are WAY worse

[TPCDrafting]

I built Dieselminded's heat shield out of 1/8" alum. diamond plate, put in the BHAF. A week or two later I bought Piers 16 cm housing, the one on special that is ported for improved flow. Driving w/o a trailer the only differences I saw were just a slight more lag on the turbo and it's a bit quieter than it was with my stock air box and a KN filter. Hooked up the horse trailer and headed for the mountains. One hill that is about 6-7 miles of steep grade - interstate with 75 speed limit. Stock turbo/air box with KN I could hold 65 in 5th gear, same hill, same load I was down to 50 and had to down shift, I just couldn't drive lighter footed in 5th and make the top of the hill.

Power mods: 11 plate, slid partly forward with adjusted gov. lever, 3k gsk, afc springs, 16. 5 timing.



The only part of Piers directions I didn't follow was I didn't take out the boost line to the AFC. I just plugged it on the turbo end in case this didn't work out, then I could just bolt up the old housing or if I could afford a new turbo that happened to be waste gated.



Anything else I did wrong? I'd be happy with a little temp drop, but I wasn't expecting it to be way worse.

 

[KYOUNG]

Did your boost go down???????

 

[TPCDrafting]

It used to max out around 30-31, now it goes to 28-29, which I expected with the larger housing.

 

[DRAG DIESEL]

What results were you anticipating by slowing down the shaft speed?

 

[TPCDrafting]

I had read on here and many fellow members around this region had recommended the larger housing for increased exhaust flow which would result in a 50 to 100 deg. drop in egt's in the same driving scenario. I'm switching to the old air box first to see if that is the culpret.

 

[CumminsPower98]

The 16cm housing didn't seem to help my cousin's '97 either.

Driving together he will almost always have higher egts and a little lower boost then me. On hills towing I can usually pull ahead and not shift down as soon. We have similar custom ground plates. I think he has a little more power then I do but regardless this housing just didn't seem to lower egts.