Help with MSpnp2 + Flowforce Injector = Lean
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Joined: Jul 2018
Posts: 118
Total Cats: 5
From: Colorado
Sorry I've been MIA. I decided I needed to take a step back, regather myself, analyze what was going on and what to do going forward. Also it was my birthday this past weekend so I needed the time with family.
I tried that, but I didn't feel comfortable going for a drive. I set the deadtimes to 1.8ms and it seemed to idle ok, but I just didn't like the VE values to be where they were. I know it's probably just a # in the PW calculation, but to get it to idle at stoich, VE values in the idle area were at 5. It also felt kind of sluggish in response to changes in quick throttle events at idle. I suppose I could save a separate tune to try this real quick and just drive it down the block and back.
Other than that I just reset the deadtimes back to the manufacture spec and have tuned to that. It actually drives pretty well 90% of the time. Driving it today it actually doesn't really spike lean in between shifts unless I'm really shifting slow. For the most part it goes rich first then begins to go lean and at that point I'm already back on the throttle.
As mentioned previously it only ever really goes lean when MAP goes to ~15 kpa, usually during no load/overrun. But fuel does usually come back on smoothly whenever throttle is applied, it never stumbles or bogs. I may try again with the 1.8ms dead times just to experiment with, but as mentioned I earlier I have no intention to have "tuning" become a full time job and will have it professionally tuned at some point. For now, it drives okay and maybe I just need to relax a bit and not be so OCD about seeing "perfect AFR #'s"
Current tune and datalog attached if anyone cares to take another look.
Once again SpartanSV. Thanks for your help in all of this! Thanks for taking your time to help me out and look over my tune I really appreciate it!
EDIT: Whoops, datalog is bigger than 5mb so I can't upload it. I think I will just get another datalog tomorrow.
I tried that, but I didn't feel comfortable going for a drive. I set the deadtimes to 1.8ms and it seemed to idle ok, but I just didn't like the VE values to be where they were. I know it's probably just a # in the PW calculation, but to get it to idle at stoich, VE values in the idle area were at 5. It also felt kind of sluggish in response to changes in quick throttle events at idle. I suppose I could save a separate tune to try this real quick and just drive it down the block and back.
Other than that I just reset the deadtimes back to the manufacture spec and have tuned to that. It actually drives pretty well 90% of the time. Driving it today it actually doesn't really spike lean in between shifts unless I'm really shifting slow. For the most part it goes rich first then begins to go lean and at that point I'm already back on the throttle.
As mentioned previously it only ever really goes lean when MAP goes to ~15 kpa, usually during no load/overrun. But fuel does usually come back on smoothly whenever throttle is applied, it never stumbles or bogs. I may try again with the 1.8ms dead times just to experiment with, but as mentioned I earlier I have no intention to have "tuning" become a full time job and will have it professionally tuned at some point. For now, it drives okay and maybe I just need to relax a bit and not be so OCD about seeing "perfect AFR #'s"
Current tune and datalog attached if anyone cares to take another look.
Once again SpartanSV. Thanks for your help in all of this! Thanks for taking your time to help me out and look over my tune I really appreciate it!
EDIT: Whoops, datalog is bigger than 5mb so I can't upload it. I think I will just get another datalog tomorrow.
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Joined: Nov 2020
Posts: 29
Total Cats: 4
Can I revive this thread? 
I have the exact same issue with my 650cc injectors, they dont like to inject any fuel below 1.5 ms pulsewidth
another problem is that I have to idle very rich to keep my injectors above 1.5 ms
did you find any solition to this?
my 1.6 is running semi-sequential on MS3
Can wiring in full sequential maybe help?
Kindregards,
I have the exact same issue with my 650cc injectors, they dont like to inject any fuel below 1.5 ms pulsewidth
another problem is that I have to idle very rich to keep my injectors above 1.5 ms
did you find any solition to this?
my 1.6 is running semi-sequential on MS3
Can wiring in full sequential maybe help?
Kindregards,
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