Matthew Jeschke
Full Access Member
@Mudsport96 it's been so long since I tuned the injectors. Yeah, could be other way around for pressure. I looked at swapping all the L59 fuel system over but was way too much work. The guy coaching me on tuning just said how to adjust what I needed in the parameters. Worked like a champ.
I need to learn more about spark. I've probably studied it for a good 40 or 50 hours of YouTube university haha... Tuning forums are DANGEROUS though. So many people just there to chat and don't know what they are talking about. Honest to God, this is the BEST forum I've found EVER for mechanic stuff! The little you've all shared with me is more than I've heard from tuning forums. Problem is you don't know good from bad on those.
Anyways, I'm running the LM7 spark map on the LQ9 build. It works down low but I think it's a bit much timing up high. That said, its far less timing than what I see on the Corvette or other LS1 or LS2 builds factor settings, so thinking its safe. Down low I don't see any knock at all... Up high I can get it but I never really go WOT so I've not done much time playing with any of that yet. Timing actually scares me to death haha... On my high priority todo list is to start transferring LQ9 baseline spark settings into my current tune. I just don't know how one thing will affect another, tuning is quite complicated.
@Marky Dissod could be... idk? I am using a wideband so it's quite reliable either way. I tried with narrow bands but can only do so much, and no PE with those. When tuning PE I made PE PIG rich, then slowly leaned it out. The computer doesn't have any feedback for PE (narrow band O2 sensors only really work for cruise and idle from what I understand). So I read the wideband with each run I leaned it out to get closer to 12.6:1. I said good enough when it got between 12:0 and 11:0 to 1. I don't really do any WOT stuff with the truck. I may revisit PE in future but spark is really my next thing to tackle.
The truck tune was kicking PE on at 90% throttle and don't recall what cylinder pressure... but really high. It only really goes to PE when the engine is REALLY REALLY under load. I think they may have baked the extra fuel into the VE table was my guess.
With the aftermarket cam, I had to redo all that stuff. PE is really kind of stupid. Best if the VE table is all dailed in, in my opinion (blend from 14.7:1 light cruise & idle to 12.6:1 WOT stuff). However, I'm using PE as that's how it was explained to me to tune it.
What I'd REALLY love is if the controller had a pin that would go high (for a switch) when PE is enabled. Then you could have the computer run an injector at the throttle body to put in water or methane. Then just run 1 lambda all the time with the main injectors. In my opinion that's the route to go with direct injection to clean the intake runners but manufacturers are too cheap to do it. They could even just pump gas through the throttle body injector.
I need to learn more about spark. I've probably studied it for a good 40 or 50 hours of YouTube university haha... Tuning forums are DANGEROUS though. So many people just there to chat and don't know what they are talking about. Honest to God, this is the BEST forum I've found EVER for mechanic stuff! The little you've all shared with me is more than I've heard from tuning forums. Problem is you don't know good from bad on those.
Anyways, I'm running the LM7 spark map on the LQ9 build. It works down low but I think it's a bit much timing up high. That said, its far less timing than what I see on the Corvette or other LS1 or LS2 builds factor settings, so thinking its safe. Down low I don't see any knock at all... Up high I can get it but I never really go WOT so I've not done much time playing with any of that yet. Timing actually scares me to death haha... On my high priority todo list is to start transferring LQ9 baseline spark settings into my current tune. I just don't know how one thing will affect another, tuning is quite complicated.
@Marky Dissod could be... idk? I am using a wideband so it's quite reliable either way. I tried with narrow bands but can only do so much, and no PE with those. When tuning PE I made PE PIG rich, then slowly leaned it out. The computer doesn't have any feedback for PE (narrow band O2 sensors only really work for cruise and idle from what I understand). So I read the wideband with each run I leaned it out to get closer to 12.6:1. I said good enough when it got between 12:0 and 11:0 to 1. I don't really do any WOT stuff with the truck. I may revisit PE in future but spark is really my next thing to tackle.
The truck tune was kicking PE on at 90% throttle and don't recall what cylinder pressure... but really high. It only really goes to PE when the engine is REALLY REALLY under load. I think they may have baked the extra fuel into the VE table was my guess.
With the aftermarket cam, I had to redo all that stuff. PE is really kind of stupid. Best if the VE table is all dailed in, in my opinion (blend from 14.7:1 light cruise & idle to 12.6:1 WOT stuff). However, I'm using PE as that's how it was explained to me to tune it.
What I'd REALLY love is if the controller had a pin that would go high (for a switch) when PE is enabled. Then you could have the computer run an injector at the throttle body to put in water or methane. Then just run 1 lambda all the time with the main injectors. In my opinion that's the route to go with direct injection to clean the intake runners but manufacturers are too cheap to do it. They could even just pump gas through the throttle body injector.