Detroit80
Full Access Member
I have a 1990 CCLB, Banks Sidewinder with wastegate, that's been basically parked for about a year due to multiple issues...biggest ones being some pretty decent oil leaks, AC failed (which is a HUGE bummer here in Phoenix, Arizona, lol), and had been dealing with high EGT/high coolant temps for a while when pulling trailers. I took the easy way out and picked up a Chevy K2500 6.5 diesel..that now is also having issues of it's own. I was never happy with the lack of power from the 6.5 compared to the 7.3 anyways, so now I'm looking at doing some repairs to the Ford and putting it back on the road.
I understand the basics of what causes high EGTs - too much fuel/not enough air, and timing being out of spec. I was reading over some other threads where it was mentioned that pre-turbo exhaust leaks are also a big deal when it comes to EGTs, and I'm not understanding how an exhaust leak would cause EGTs to go up. I'm not arguing it, just trying to understand it better.
Is it just a matter of exhaust leaks will reduce the ability of the turbo to spool up to higher pressures thus causing a problem in the "not enough air" department?
I understand the basics of what causes high EGTs - too much fuel/not enough air, and timing being out of spec. I was reading over some other threads where it was mentioned that pre-turbo exhaust leaks are also a big deal when it comes to EGTs, and I'm not understanding how an exhaust leak would cause EGTs to go up. I'm not arguing it, just trying to understand it better.
Is it just a matter of exhaust leaks will reduce the ability of the turbo to spool up to higher pressures thus causing a problem in the "not enough air" department?