Noob's tune Knocking and going lean on down shift

[Moe Ashraf]

I've done a few changes here and there in the tune, car (2013 ZL1) seems to idle and cruise fine and WOT seems to be decent and the car feels strong, the only issue is that it just knocks when i down shift and then goes back to normal, i feel allot of shuddering for a second before it goes back to normal. unfortunately i do not have my AFR hooked up to the pro link but AFR is at around 11.7-12.2 at WOT and idles at 14.7 average as well as cruising. what am i doing wrong? i'm new to HPT and this is my very first go at tuning, so im not asking for a free tune i just need some guidance.
i have modified my tune since the log provided with the same issue present.



Mods:
-CIA
-Catless 2" Headers
-Stock Ported TB
-Ported snout and blower
-2.55 upper pulley
-DW 90lb Injectors (I have put the data provided)

13 ZL1.hpt
wot3.hpl

Down shift is at 22 seconds and another at 28.

[Moe Ashraf]

Bump, anyone?

[Lakegoat]

The knock is in a narrow range. If you don't have the wideband hooked up, you cannot tell if the cell is lean or not. 12 is too high for a blower motor and your timing at wot is pretty high also---even for 93 octane. Letting off the gas quickly shows as a lean condition, so it may be burst knock. Are you logging that?
When you say downshift, are you a manual transmission? If so, go back and enable spark smoothing.

[Lakegoat]

You should be logging cylinder airmass and dynamic air also. Is this a DI Engine?

[asteggall]

I've done a few changes here and there in the tune, car (2013 ZL1) seems to idle and cruise fine and WOT seems to be decent and the car feels strong, the only issue is that it just knocks when i down shift and then goes back to normal, i feel allot of shuddering for a second before it goes back to normal. unfortunately i do not have my AFR hooked up to the pro link but AFR is at around 11.7-12.2 at WOT and idles at 14.7 average as well as cruising. what am i doing wrong? i'm new to HPT and this is my very first go at tuning, so im not asking for a free tune i just need some guidance.
i have modified my tune since the log provided with the same issue present.



Mods:
-CIA
-Catless 2" Headers
-Stock Ported TB
-Ported snout and blower
-2.55 upper pulley
-DW 90lb Injectors (I have put the data provided)

Down shift is at 22 seconds and another at 28.

You need to get a WB on there ASAP. Looks like it's lean the LTFT's are adding fuel to your WOT and your spark is high for 93 pump gas and 12 psi. Also you are commanding .80 at WOT in the tune (showing .79 in log probably because the LTFT's is adding fuel) so your AFR with 10% ethanol gas is really 11.3 not 11.7-12.2. 11.7-12.2 is WAY too lean for a LSA 11.1-11.3 is where most run them. Need to log MAF in hz also along with a few more PIDs.

[Moe Ashraf]

The knock is in a narrow range. If you don't have the wideband hooked up, you cannot tell if the cell is lean or not. 12 is too high for a blower motor and your timing at wot is pretty high also---even for 93 octane. Letting off the gas quickly shows as a lean condition, so it may be burst knock. Are you logging that?
When you say downshift, are you a manual transmission? If so, go back and enable spark smoothing.

thank you so much for replying,
and i'm sorry i should've mentioned that i live in the UAE so we have 98 octane pump gas so i'm guessing that's why timing is high? as i haven't touched the tables yet.
i'll add some pids soon enough, do you recommend any specific layout?
and this is a LSA so its port injection.

[Moe Ashraf]

You need to get a WB on there ASAP. Looks like it's lean the LTFT's are adding fuel to your WOT and your spark is high for 93 pump gas and 12 psi. Also you are commanding .80 at WOT in the tune (showing .79 in log probably because the LTFT's is adding fuel) so your AFR with 10% ethanol gas is really 11.3 not 11.7-12.2. 11.7-12.2 is WAY too lean for a LSA 11.1-11.3 is where most run them. Need to log MAF in hz also along with a few more PIDs.

thanks for replying, and yeah i'm hooking it up to my pro link soon enough, 98 pump gas where i'm from and my actual AFR reads 10.9-11.2 so i guess i'm good there
i've added a few pids now so i will post an updated log

[SultanHassanMasTuning]

you have an issue with your fuel pump

your not logging enough channels for E67 pcm

your ignition is a bit high

13 ZL1 test.hpt

[asteggall]

you have an issue with your fuel pump

your not logging enough channels for E67 pcm

your ignition is a bit high

13 ZL1 test.hpt

Defiantly right. I didn't even notice his fuel pressure was falling to 45 psi under WOT. He needs to look into that for sure.

[lukearmstrong1990]

your injector data cant be right. you've maxed out the IFR table in the last 10 cells.

having a maxed IFR table makes the entire airflow model not function properly. you're using a blended tune also meaning the airflow model isn't working correctly but it's trying to do use MAP/Dynamic/MAF references to airmass and transition between the 3.

disable and zero out burst knock

disable and max out fast torque exit.

then set up a quality config with torque management sources and individual spark correction channels and go logging with a wideband fitted. then you'll paint a clearer picture of what's going on

[5FDP]

When would he ever be running 70+ psi of fuel pressure?

Being maxed out there won't matter, never seen anyone have an issue.

[asteggall]

When would he ever be running 70+ psi of fuel pressure?

Being maxed out there won't matter, never seen anyone have an issue.

It's not 70 psi rail pressure. It's 70 psi injector delta so the chances to see that on a 12 psi boost pump gas car is not going to happen even if his rail pressure was were it should be at 65 psi he would only be at a delta of 53 psi.

[Moe Ashraf]

you have an issue with your fuel pump

your not logging enough channels for E67 pcm

your ignition is a bit high

13 ZL1 test.hpt

Thanks for the Help Sultan, i see you lowered timing and added a bit of protection here and there, about the fuel pump do you think i'm running out of Pump or there is a problem with my Pump? i have uploaded the tune to the car and went for a log with my Wide band logging now, and as you can see at 00:00:06 i start down shifting, and i'm still experiencing the same issues.

wot7.hpl

[Moe Ashraf]

your injector data cant be right. you've maxed out the IFR table in the last 10 cells.

having a maxed IFR table makes the entire airflow model not function properly. you're using a blended tune also meaning the airflow model isn't working correctly but it's trying to do use MAP/Dynamic/MAF references to airmass and transition between the 3.

disable and zero out burst knock

disable and max out fast torque exit.

then set up a quality config with torque management sources and individual spark correction channels and go logging with a wideband fitted. then you'll paint a clearer picture of what's going on

you see the thing is the numbers provided exceed what i can input.
i'll try what you've recommended and get back asap.

[Moe Ashraf]

When would he ever be running 70+ psi of fuel pressure?

Being maxed out there won't matter, never seen anyone have an issue.

i am maxed out as the injector data provided is larger than what i can input into HPT, so do you think all the injector data is fine? as the car drives pretty well.

[asteggall]

Thanks for the Help Sultan, i see you lowered timing and added a bit of protection here and there, about the fuel pump do you think i'm running out of Pump or there is a problem with my Pump? i have uploaded the tune to the car and went for a log with my Wide band logging now, and as you can see at 00:00:06 i start down shifting, and i'm still experiencing the same issues.

With your mods you have enough pump there is something going on there. It is showing CL-fault and the way the fuel psi climbs to 75 psi after you get off the throttle. There is no KR logged it is logging burst knock.

i am maxed out as the injector data provided is larger than what i can input into HPT, so do you think all the injector data is fine? as the car drives pretty well.

You will max out the table at 127. Looking at it again you are maxing it out at 82psi and you will never see that injector delta so it's not a issue. Basically take your fuel psi and subtract the boost psi and that's you injector delta. There is something going on with the pumps it's almost like one pump is not working.