4" loud one
Senior User
Joined: Mar 2006
Posts: 136
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From: Twin Cities, MN
I have the non-wastegated ATS and see 14 psi and no smoke. 850 egt. Want to turn it up more but the fear of more boost and weak head bolts don't sit well with me.
1986 F-250 SC 6.9 ATS turbo 3.55's C6
1986 F-250 SC 6.9 ATS turbo 3.55's C6
Posting Guru
Joined: Aug 2006
Posts: 2,175
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From: Kent WA
Originally Posted by Jake S
I have the non-wastegated ATS and see 14 psi and no smoke. 850 egt. Want to turn it up more but the fear of more boost and weak head bolts don't sit well with me.
1986 F-250 SC 6.9 ATS turbo 3.55's C6
1986 F-250 SC 6.9 ATS turbo 3.55's C6
Senior User
Joined: Mar 2006
Posts: 136
Likes: 0
From: Twin Cities, MN
Pulled a truck and trailer to the scrap yard the other day. Tipped the scale at 16,820 lb. I didn't work it too hard and it moved out pretty nice. I only get 13 mpg empty and 11.5 pulling like that. I don't have any experience with a non-turbo to compare with though. Too much boost and the head bolts won't do their job and I am too poor to afford ARP's for now. But I have lot's of time being that frost and concrete don't mix well.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
After looking at my head gaskets when I tore mine down, I would say 14 PSI is plenty with stock head bolts.
850 degrees with the thermocouple where?
If it is after the turbo, 850 is about all you want.
850+300= 1150
850 degrees with the thermocouple where?
If it is after the turbo, 850 is about all you want.
850+300= 1150
Senior User
Joined: Mar 2006
Posts: 136
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From: Twin Cities, MN
I could never get a straight answer out of ATS where it is. I have a monolithic looking exhaust side of the turbo so I can't trace what goes where. I only get a little smoke when I floor it off idle. At night other headlights are hazy, not dimmed at all. It has all the power I need, so I won't turn it up any more.
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