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!

Turn off launch control

I don't think that was ever turned on but ill check that when I get home tonight.

aaaadjust your accel enrichment?

I haven't adjusted that and i noticed the tuner I used only worked on the fuel map. I will probably have to play around with the accel enrichment.

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.

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)?

Thanks for the informative replies! Hopefully it is just launch control turned on or something easy.

Maybe its just the way I rev match, but even at 99% set point, I occasionally engage LC. Typically I leave it on, and just do my best to not stamp the throttle as hard to rev match.

Good to know, now you've got me curious how much I actually use the throttle on rev matches.

I'm not actually heel toeing. Idk if my pedals or are bent, or my brake pedal is squishy But my brake pedal goes down so far that I can't swing my foot to the gas pedal. I also havnt driven on a track so I havnt had a need to heel toe.

Adjust the height of the brake pedal and know that the throttle pedal rod can be bent to bring it closer to the brake.

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.

I kinda tried to bend the throttle. Maybe I'm not bending in the right area, and I didn't know I could adjust the brake pedal. I'll have to play around with it after I get the car back together and running again.

Hey all, the Launch control wasn't on so it's most likely the AE settings. I do notice now that when I press on the throttle it hesitates and goes very rich and then it goes back to normal.

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?

Thanks for your reply, I am now using unlimited injection. What injectors are you using and did changing this cause any change to the fuel map or any other part of the tune?

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.

Just wanted to make an update to this post, I was helped by someone on the FB group and he helped me solve the issue with the Accel Enrichment. We had to play around with it for a while but now it's much better and I can do heel toe. Thanks for all the input in this thread!