Trouble heel-toe downshift with MSPNP
#1
Trouble heel-toe downshift with MSPNP
Hey guys,
To start, I have tried searching but couldn't find any good info on my situation. I am not sure if this is a tuning issue but ever since I got megasquirt, I have not been able to heel-toe rev match, it just seems to not give any gas for the rpm to go up. I was able to do this easily before with just the link ecu and before my turbo install. My first thought would be to try and adjust the IACV but I want to know if messing with the IACV screw, would that change anything within my tune? Or would this be a megasquirt/tunerstudio function that I need to adjust, if so where would I start? Please let me know if you have any ideas. Thanks!
To start, I have tried searching but couldn't find any good info on my situation. I am not sure if this is a tuning issue but ever since I got megasquirt, I have not been able to heel-toe rev match, it just seems to not give any gas for the rpm to go up. I was able to do this easily before with just the link ecu and before my turbo install. My first thought would be to try and adjust the IACV but I want to know if messing with the IACV screw, would that change anything within my tune? Or would this be a megasquirt/tunerstudio function that I need to adjust, if so where would I start? Please let me know if you have any ideas. Thanks!
#6
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Out of the box, the accel enrichments should be close enough to get the car to blip. If it blips clean from idle, they are definitely close enough. My money is on launch control being turned on, which will turn off the injectors when you dip the clutch above the LC setpoint, and that will feel exactly like what the OP described.
#7
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There's no reason you'd ever go past a reasonable LC TPS set-point. I usually put mine around 70%, far higher than I'd ever see heel-and-toe. I'd guess accel enrichment as well, assuming LC is set appropriately.
It would really benefit you to learn how to datalog and read the log, this will help teach you how to solve issues like this in the future. Does it go lean? Does it go rich? Does pulse-width go to zero? Are there any other triggers that may indicate a setting is activating when they shouldn't? Are all your sensors reporting believable results (ie: TPS matches what you actually did with your foot)?
It would really benefit you to learn how to datalog and read the log, this will help teach you how to solve issues like this in the future. Does it go lean? Does it go rich? Does pulse-width go to zero? Are there any other triggers that may indicate a setting is activating when they shouldn't? Are all your sensors reporting believable results (ie: TPS matches what you actually did with your foot)?
#9
There's no reason you'd ever go past a reasonable LC TPS set-point. I usually put mine around 70%, far higher than I'd ever see heel-and-toe. I'd guess accel enrichment as well, assuming LC is set appropriately.
It would really benefit you to learn how to datalog and read the log, this will help teach you how to solve issues like this in the future. Does it go lean? Does it go rich? Does pulse-width go to zero? Are there any other triggers that may indicate a setting is activating when they shouldn't? Are all your sensors reporting believable results (ie: TPS matches what you actually did with your foot)?
It would really benefit you to learn how to datalog and read the log, this will help teach you how to solve issues like this in the future. Does it go lean? Does it go rich? Does pulse-width go to zero? Are there any other triggers that may indicate a setting is activating when they shouldn't? Are all your sensors reporting believable results (ie: TPS matches what you actually did with your foot)?
#12
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When I first started practicing heel-toe on the street and then went back to the track I was pushing much harder on the brake at the track and my brake pedal was too low to access the throttle pedal. Adjustments were necessary to make everything perfect.
#15
I'm still pretty new to this... but I was having similar issues with sluggish response when I blip the throttle for a down shift. Being inexperienced I had misunderstood the injection modes and was running untimed injection initially. Never could get the blip to feel right with accel enrichment tuning. After posting here, it was suggested to use semi-sequential. That made all the difference. I then quickly upgraded to sequential and it feels even better, like it did stock. Just a suggestion as I was having similar problems, could be something to look check out. What injection mode are you using?
#16
I'm still pretty new to this... but I was having similar issues with sluggish response when I blip the throttle for a down shift. Being inexperienced I had misunderstood the injection modes and was running untimed injection initially. Never could get the blip to feel right with accel enrichment tuning. After posting here, it was suggested to use semi-sequential. That made all the difference. I then quickly upgraded to sequential and it feels even better, like it did stock. Just a suggestion as I was having similar problems, could be something to look check out. What injection mode are you using?
#17
So I have a '96 and a diypnp for context. I started off with my stock injectors and things were decent, but certainly not perfect. After going to EV14 640cc it got much worse. Switching to Semi-Sequential required no hardware changes for me. If i remember correctly switching to semi-sequential required cutting fuel in half and deciding on 2 squirt/simultaneous or 1 squirt/alternating. Nothing else was changed . Likely a bit of the blind leading the blind here so you may want to read up a bit. What i read was you need to tune the fixed injection timing a bit to realize the benefit. There is a map for even finer control. If you're are able to add the drivers needed for sequential, personally I saw the biggest improvement from this upgrade.
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