PwrSmoke
Full Access Member
I have an '86 6.9L that's had a 1st Generation Banks kit (non wastegated) on it since 1987. It's just about at 140K miles of trouble-free service and I've owned it since '87. It has a 3-inch downpipe with a 4-inch exhaust system (Dynomax) grafted on. It will make about 13 psi on hard acceleration at near sea level. Fuel setting is moderate, moderate smoke, running about 550-600 EGT at high cruise. It's a bit knocky at whatever the timing is at now, vs what it was before the pump rebuild. It runs well and will make 180-190 hp on the dyno (depending on the dyno).
When I had the pump rebuilt in '98, I borrowed a Rotunda timing tool and I THINK I set it to the same spec as the factory IDI turbo (8 BTDC), but don't recall. I bought a nice 78-0100 recently so I'd like to check it again. My questions:
1) Given the change to ULSD and all, is there a consensus for a good timing spec for a turbo IDI? I figure there are conditions to a number (i.e. all out power vs low smoke, etc), so if you have a recommendation, would you qualify it, please?
2) As a general question, would you set a wastegated vs non-wastegated engine differently.
Many thanks gents. Been subscribed for a long while but haven't even lurked lately (new F-150 project) and I forgot what a great IDI source this place was.
When I had the pump rebuilt in '98, I borrowed a Rotunda timing tool and I THINK I set it to the same spec as the factory IDI turbo (8 BTDC), but don't recall. I bought a nice 78-0100 recently so I'd like to check it again. My questions:
1) Given the change to ULSD and all, is there a consensus for a good timing spec for a turbo IDI? I figure there are conditions to a number (i.e. all out power vs low smoke, etc), so if you have a recommendation, would you qualify it, please?
2) As a general question, would you set a wastegated vs non-wastegated engine differently.
Many thanks gents. Been subscribed for a long while but haven't even lurked lately (new F-150 project) and I forgot what a great IDI source this place was.