rhinoo Posted February 5, 2022 Share Posted February 5, 2022 I was on here a while back and had bought a truck with an upgraded s-400 turbo which had terrible turbo lag. I added bigger injectors and made a few tweaks to the pump. Truck runs great now but egt’s are a little warm. 1050 degrees behind turbo @ 36-37 pounds of boost. If I’m driving it and get in a long pull I can let out of throttle and get it to drop down but at some point one of my lead foot drivers will be in it so I’m thinking I need to cool it down. My question is, if I get rid of the 4” exhaust will that help or do I need to back fuel down a little? I really like how it’s running and hate to defuel it. Quote Link to comment Share on other sites More sharing options...
Popular Post R.E.D Posted February 5, 2022 Popular Post Share Posted February 5, 2022 Absolutely, 5" will flow more cfm, therefore lower back pressure and lower egt's.But I don't think the drop in egt would be substantial.If your not running a straight pipe, check your muffler for obstructions ,it could be plugged up from years of use...but never the less in my opinion, it's never a good idea to give a driver a modified truck..that's just asking for trouble...just my .02¢ 2 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted February 6, 2022 Share Posted February 6, 2022 19 hours ago, R.E.D said: Absolutely, 5" will flow more cfm, therefore lower back pressure and lower egt's.But I don't think the drop in egt would be substantial.If your not running a straight pipe, check your muffler for obstructions ,it could be plugged up from years of use...but never the less in my opinion, it's never a good idea to give a driver a modified truck..that's just asking for trouble...just my .02¢ Also want to add here! be sure the muffler you buy is Made for a single exhaust truck 4inch or 5 inch ! There is a difference in dual and single ! We got burned once by making a dual into a single and not changing mufflers ! School of hard knocks came into play here! Just sayin 1 Quote Link to comment Share on other sites More sharing options...
John3406 Posted February 7, 2022 Share Posted February 7, 2022 Mechanical or electronic motor? Quote Link to comment Share on other sites More sharing options...
John3406 Posted February 7, 2022 Share Posted February 7, 2022 Nevermind i see you tweaked the pump so it must be mechanical. Whats your timing set at? Quote Link to comment Share on other sites More sharing options...
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