Tuning the 1.4t Cruze - A Mildly Scientific Approach

[Gh0st]

That did not look like fun. I won't try that. Looks like you are using the 2013 Stoich AFR.

Yeah, I'm experimenting right now and I've always preferred making sure the stoich value is near what I'm actually using for fuel. I was giving another go at the 2013 cam tables and started having that jerking issue. Switched back to the 2012 cam tables and the issue was still there, so I found the culprit being the pressure table.

[rallycar2001]

dont flash anything from 2012 to 2013 or cruze to sonic rs...
weird sound at wot is right ghost.
must be a different camshaft profile or base degree set.also a few extra adjustments that i didnt mess with. with driver demand.

[Gh0st]

dont flash anything from 2012 to 2013 or cruze to sonic rs...
weird sound at wot is right ghost.
must be a different camshaft profile or base degree set.also a few extra adjustments that i didnt mess with. with driver demand.

Well, now we know!!! Hey...someone has to figure this stuff out, right? :-)

[Regalgse]

So I tried using the populated values at the low Hz in the MAF table for a 2013 in my 2012. I did not do a A-B-A test but I believe it caused a misfire during the first few seconds of a cold start (sat over night). Just a FYI

[EagleMark]

You guys are having to much fun! I may have to lease one of these for awhile...

[Gh0st]

So I tried using the populated values at the low Hz in the MAF table for a 2013 in my 2012. I did not do a A-B-A test but I believe it caused a misfire during the first few seconds of a cold start (sat over night). Just a FYI

I don't have that issue and those tables are filled in other 2012 tunes, not just the 2013. These cars idle rough during cold starts and some people seem to think it is a misfire which I can't agree with. I do notice the car idles at 1500rpm on cold starts and I haven't figured out yet why this is despite none of the idle tables being anywhere near that.

[Gh0st]

Still having issues with timing from 1400-2200rpm from .32 to .60 g/cyl giving me knock when accelerating slowly from a cruising position. It's almost as if the DFCO is being way too aggressive and then when I start to accelerate the fueling is just not there.

[snowvette]

I have the same issue. Was thinking of just pulling the timing in those areas in the IAT table. This light throttle KR is annoying.

[Gh0st]

I have the same issue. Was thinking of just pulling the timing in those areas in the IAT table. This light throttle KR is annoying.

I pulled it out of the base timing table but haven't logged since I uploaded the tune yesterday morning, I will log tomorrow. I think last time I did that I still got knock though.

[snowvette]

Mine seems better at 4am than at 4pm, thats why I was thinking IAT table. I aslo have a MSD DashHawk so I see KR all the time. 2 deg or less. The IATs run pretty high on these things to. I drilled some small holes in the upper grill to try to get some outside air into inlet. It helped a little.

[Gh0st]

Mine seems better at 4am than at 4pm, thats why I was thinking IAT table. I aslo have a MSD DashHawk so I see KR all the time. 2 deg or less. The IATs run pretty high on these things to. I drilled some small holes in the upper grill to try to get some outside air into inlet. It helped a little.

Hmm...maybe. Guess not a bad idea to go after the IAT table first...will have to look at the multipliers to make sure it's a straight 1:1. My IATs are typically 10 degrees above ambient and I did that ghetto resonator removal the other day.

[snowvette]

Lol. I tryed it for a day but put it back.
I was watching LTFTs this morning and with the stock intake with a K&N filter, trims got as high as +13.3% while keeping a constant mph. They stay pretty close to 0.0 will accelerating though.

[Gh0st]

There is something jacked up on my car, not sure what it is. Getting so much knock retard at part throttle and I'm getting STFTs of like 30-50 in some areas. There's nothing in the tune I'm running that would cause something like this, so I'm going to look under the hood to see if something is awry. When I go WOT...no knock retard, but I'll be damned if I am traveling at 40mph and all of a sudden 2 degrees of knock without even touching the pedal!!

[Gh0st]

Lol. I tryed it for a day but put it back.
I was watching LTFTs this morning and with the stock intake with a K&N filter, trims got as high as +13.3% while keeping a constant mph. They stay pretty close to 0.0 will accelerating though.

Exactly, something isn't right. Why are the trims dumping so much fuel when being at a constant mph? Why is it leaning out?

[snowvette]

I have no idea on the fueling issue. As far as the timing, double check your low octane table. I found I had a few cells that were a couple degrees higher than the high octane table. (face palm) I still learnig.

[Gh0st]

This is what I'm talking about. I should not be getting knock retard in any of these areas this bad. I'm starting to think I put bad gas in my car the other day. It is 91 Octane non-oxygenated.



I logged two times. Once with completely stock tune and then once again with 2 degrees pulled out everywhere in the high octane table. Still getting a shit ton of knock.

[Gh0st]

FWIW, I get the very same exact 2 degrees on both the stock and tune with timing pulled. It's really weird.

[Gh0st]

dont flash anything from 2012 to 2013 or cruze to sonic rs...
weird sound at wot is right ghost.
must be a different camshaft profile or base degree set.also a few extra adjustments that i didnt mess with. with driver demand.

It looks like both the 2012 and 2013 Cruze use the same exact camshaft part numbers....weird

[snowvette]

Wow, that is bad. No 93 in your area?

[projectlnf]

It looks like both the 2012 and 2013 Cruze use the same exact camshaft part numbers....weird

the 2013 uses different camshaft actuators. a buddy of mine that works with me has changed them on both models. the 2013 has alot of different calibrations for that reason. i did the same thing you did but from a 2013 to a 2012. so i grabbed the tech 2 from work and did some looking around then my buddy came and told me -___- i was kinda mad so i just mixed the two together and the car runs perfect.