OM606 Turbo Selection for Truck application
OM606 Turbo Selection for Truck application
what sort of fueling are you running at your 2nd and 3rd gear rpms? I guess the way my map is tuned, and I think the "stock" DSL1 is tuned, is that for a given throttle position fueling stays the same for a wide range of rpm. Maybe yours has more fueling in the higher rpm cells? it could also be a combination of what you said, the higher backpressure and that you are falling off the compressor map and the intake air temp is going up a bit? I think VE for these engines is in the 2000's (this might be based on the stock turbo on them), but I do imagine that it's getting less air/stroke for a given boost pressure at 4500 than at 2500rpm, which I think would explain higher egts.
I know it's not actual fueling but maybe it's worth comparing if you still have a 6cc pump. My dsl1 settings are as follows, 100% throttle is 83ul, which is a rack position of 1970 (for 2500-4000rpm). I'm almost never in this area of the map for more than 5 seconds or so as egts head towards 1400F w/ ~23psi and it's normally time to shift anyways. 90% is 73ul which is a rack position of 1770 and that seems to be fine with 20-23psi of boost and egts in the 1200F range.
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05-13-2020, 12:21 PM #15what is the max boost you are running with that turbo? When I was towing with the truck I was pushing the oe kkk to 23psi at ~2500rpm (probably 70ul of fuel) and this seemed to get me up steep highway grades, so I'm hoping that if I go with the garret 2056 i'd be able to at least match that performance/flow. btw...if your 2056 is in good shape still and you are looking to offset ($) your gt23v purchase maybe you'd be interested in selling it to me (if you don't already have other plans for it).
what sort of fueling are you running at your 2nd and 3rd gear rpms? I guess the way my map is tuned, and I think the "stock" DSL1 is tuned, is that for a given throttle position fueling stays the same for a wide range of rpm. Maybe yours has more fueling in the higher rpm cells? it could also be a combination of what you said, the higher backpressure and that you are falling off the compressor map and the intake air temp is going up a bit? I think VE for these engines is in the 2000's (this might be based on the stock turbo on them), but I do imagine that it's getting less air/stroke for a given boost pressure at 4500 than at 2500rpm, which I think would explain higher egts.
I know it's not actual fueling but maybe it's worth comparing if you still have a 6cc pump. My dsl1 settings are as follows, 100% throttle is 83ul, which is a rack position of 1970 (for 2500-4000rpm). I'm almost never in this area of the map for more than 5 seconds or so as egts head towards 1400F w/ ~23psi and it's normally time to shift anyways. 90% is 73ul which is a rack position of 1770 and that seems to be fine with 20-23psi of boost and egts in the 1200F range.
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