Taking the mystery out of tuning the 1.4
- Thread starter Stew
- Start date
nickalltogether
New member
Is anyone experiencing a max throttle of 39.2% my pedal and driver command are both 100%.
Stew
Sedans Rule!
Hey guys, I stumbled across these engine tuning videos the other day and found them really informative. Start with tuning 101 part 1, they cover fundamentals but that's good, there were a couple things that I was having trouble connecting the dots on and these helped. Plus, he uses HPTuners and he showed a few tricks I didn't know with that.
Boy, looking back on this tune I'm a little embarassed
but it was a starting point. At any rate the link to the first of five videos is below, hopefully someone else will find them helpful!
https://www.youtube.com/watch?v=u1wzEVwAfJQ
Boy, looking back on this tune I'm a little embarassed
but it was a starting point. At any rate the link to the first of five videos is below, hopefully someone else will find them helpful!https://www.youtube.com/watch?v=u1wzEVwAfJQ
ScarabEpic22
Member
I'd suggest anyone new to tuning look up HP Academy as well, they have a free series of videos that outline the fundamentals of tuning. It is not specific to our vehicles, but a solid background.
Hey guys, I stumbled across these engine tuning videos the other day and found them really informative. Start with tuning 101 part 1, they cover fundamentals but that's good, there were a couple things that I was having trouble connecting the dots on and these helped. Plus, he uses HPTuners and he showed a few tricks I didn't know with that.
Boy, looking back on this tune I'm a little embarassed
https://www.youtube.com/watch?v=u1wzEVwAfJQ
Mega is producing a Part 6 "Case Study" using the Cruze 1.4 E78 ECU and HP Tuners!! https://www.youtube.com/watch?v=jNtr5DQmIMw
BJSchubert
New member
OK first real post here, bought a 17 Sonic 1.4T. Love it so far needed it for the work commute was putting too man miles on my 02 SS, and wasting gas!
I have been using EFI live for a long time now and have licensed the Sonic. I have crossed over as best I can all of 10 tables mentioned on page one. Here's my problem, under some acceleration in 5th or 6th gear between 1500 and 2500 RPM's the car bucks like a bronco, once I give it a little more throttle it down shifts and then doesn't do it above 2500. What am I missing? I played around with all the settings raising and lowering without any change. I can post my tune up if someone can look at it.
I have been using EFI live for a long time now and have licensed the Sonic. I have crossed over as best I can all of 10 tables mentioned on page one. Here's my problem, under some acceleration in 5th or 6th gear between 1500 and 2500 RPM's the car bucks like a bronco, once I give it a little more throttle it down shifts and then doesn't do it above 2500. What am I missing? I played around with all the settings raising and lowering without any change. I can post my tune up if someone can look at it.
Stew
Sedans Rule!
I've only played around with HP Tuners but I'll take a look if you post it up. Although I have gained more knowledge since I first posted this I just want to make it perfectly clear I am not a tuner. Also to reiterate, there are better ways to tune than what's posted here.
You can disregard the ninth value 'Turbo Overspeed Airmass Limit Minimum', that is not doing what I believed it was when I first posted this.
Just be super careful with your new car!
You can disregard the ninth value 'Turbo Overspeed Airmass Limit Minimum', that is not doing what I believed it was when I first posted this.
Just be super careful with your new car!
BJSchubert
New member
I have tuned a bunch of cars but mostly 09 and older. With a few CTSV's here and there but I only worked on drive ability not WOT. I have a guy for that. I uploaded my stock read and what I modified. Let me know if something jumps out at you. I also edited the trans but only pulled 50% out of the shift times and pulled the TQ management that it had. I put it back to stock once I started getting the bucking with the engine tune and it didn't make a difference. I want to say its having issues with the TQ and shifting. There was a trick on the CTSV by modifying the B8220 Coefficient table A20. Havent tried that in this case.
https://www.dropbox.com/s/gcf416f8xr92g43/Sonic%20stock%20read%20E78_0000.ctz?dl=0
https://www.dropbox.com/s/x3g3oms4iw5gslm/Sonic%20stock%20read%20E78.ctz?dl=0
I havent been cleared with 10 posts yet. so let me know if you cant get these.
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BJSchubert
New member
Download efi live and take a look. The software is free. It won't let you make changes but you can at least see it.
EFILive - The Latest - Download EFILive
Big Turbo Sonic
Member
I am HPTuners tuned and my car does this as well. I have never tired to fix the issue because it is infrequent and it doesnt bother me. I am not a tuner, but I have a theory as to why this happens. When you are part throttle like your are explaining I believe the car is jumping values in Table: Driver Demanded A. Try raising the values in the 80 and 90 percent throttle position to make a smoother transition. Dont edit below 80 percent.
This is all theory, I have not tested this. Worth a shot.
Stew
Sedans Rule!
I've downloaded the software, of the two tune files you posted which one is the one you're using?
Either way I would set the 'Engine Operations -> Boost Control -> Maximum Boost Pressure' to the boost pressure you want in all the cells. In HP Tuners the ECT column is really not ECT but RPM (a wrongly labeled column that threw me off for a while) and it looks like the same thing may be the case with EFI Live.
After this change do your test drive gingerly to make sure you don't get any crazy boost issues.
Either way I would set the 'Engine Operations -> Boost Control -> Maximum Boost Pressure' to the boost pressure you want in all the cells. In HP Tuners the ECT column is really not ECT but RPM (a wrongly labeled column that threw me off for a while) and it looks like the same thing may be the case with EFI Live.
After this change do your test drive gingerly to make sure you don't get any crazy boost issues.
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BJSchubert
New member
You use 7.5 to edit it. Ill take a look.
mitdr774
also a dinner prick
It does me no good if I dont know exactly what table is missing and what to look for. I have looked into EFIlive in the past, but the cost to switch is a bit prohibitive given my knowledge when it comes to tuning.
I have enough credits to license my current 2017 and make changes to just about everything im concerned with except being able to make more power. Spending $800-1000 for a new system to be able to tune a car that is limited in power potential is beyond what im willing to spend.
ScarabEpic22
Member
B7021, you will likely need to raise this table a little bit as well.
B8802, you cant just have this ramp to 300kw in the 100% TPS column, would explain part of your driveability issue. Start with a smaller change, like 123-> 150 and see if you get the power increase by logging commanded TQ.
B7017, reset to stock then raise like 15%. You could do a little higher if you want. This is likely the souce of your bucking, going from 199 Nm in 1850 to 407 at 2000rpm is a massive jump and will cause the ECM to constantly interpolate between them.
B7018, raise this a bit (say 15% to start or match the % increase from B7017).
B8802, you cant just have this ramp to 300kw in the 100% TPS column, would explain part of your driveability issue. Start with a smaller change, like 123-> 150 and see if you get the power increase by logging commanded TQ.
B7017, reset to stock then raise like 15%. You could do a little higher if you want. This is likely the souce of your bucking, going from 199 Nm in 1850 to 407 at 2000rpm is a massive jump and will cause the ECM to constantly interpolate between them.
B7018, raise this a bit (say 15% to start or match the % increase from B7017).
Chaos0311
Member
I have a BNR tune and everything appears to be set up properly but I can't view any of the tables, data logs etc. Are these files locked by the tuner or am I missing something here? I use EFILive and the autocal and I've tried everything or I think everything, to be able to view the tune.
Gimpster
New member
Not much to add to this thread yet, but... I just wanted to say, coming from the LNF... this car is very frustrating to tune on. I really miss direct injection also miss having a larger bore size. The amount of timing these 1.4's run makes me chuckle.
Before cranked up the boost, I've been working hard on knock and MAF tuning. I'm just about there, but holy crap this car is fuel sensitive and prone to knock also the burst knock settings are pretty heavy handed... but likely make a lot of sense since GM told people to run 87 octane in these. Even on 91 octane, I was seeing 3-5* KR on 2nd-3rd pulls with cold IAT's before I got it under control. I see other people on the HPT forum have struggled with this as well.
My next steps are going to be to swap injectors and install an E85 content sensor I think. E85 is readily available everywhere here in Iowa. I'm willing to take the efficiency hit for the octane.
Before cranked up the boost, I've been working hard on knock and MAF tuning. I'm just about there, but holy crap this car is fuel sensitive and prone to knock also the burst knock settings are pretty heavy handed... but likely make a lot of sense since GM told people to run 87 octane in these. Even on 91 octane, I was seeing 3-5* KR on 2nd-3rd pulls with cold IAT's before I got it under control. I see other people on the HPT forum have struggled with this as well.
My next steps are going to be to swap injectors and install an E85 content sensor I think. E85 is readily available everywhere here in Iowa. I'm willing to take the efficiency hit for the octane.
Gimpster
New member
If your tune wasn't locked, I would be shocked. That's just the nature of paying for a professional tuners services.
I just know nada about EFILive, so no idea what can/can't be locked on the logging side though.
I just know nada about EFILive, so no idea what can/can't be locked on the logging side though.