Tuning the 1.4t Cruze - A Mildly Scientific Approach

**Gh0st** · 05-31-2013

Originally Posted by rallycar2001

my logs read 29 psi of boost, and dont display things after i change gauges. is there some kind of special correction factor?

Log the Boost Pressure Sensor. It should have an output in kpa.

On a side note. I'm strongly considering switching my entire tune over to the 2013 calibration and seeing how it feels.

**Gh0st** · 05-31-2013

Originally Posted by rallycar2001

did you ever figure out how to tune past .75 airmass?

From my understanding, everything past .75 will be the same values as .75. I may be totally wrong though.

**cobaltssoverbooster** · 05-31-2013

If you exceed the axis of a graph it uses the last value it saw.

**rallycar2001** · 06-01-2013

on my logs, it doesnt matter because we never get past that much airflow anyway... i adjusted the bypass valve numbers, both of them... much better response.

**rallycar2001** · 06-07-2013

ok cool story! threads dead!

**cobaltssoverbooster** · 06-07-2013

its not dead. people are busy and progressive developments take a long time especially when your going one table at a time with as many as there are available to you guys now.
EX: The LNF came out in 2008 mid year and i still make minor finds here and there. The major finds didnt really get finished solid till maybe 3 years after support was released which was late 2008.

now factor in delays for price restricted dyno time, cops, limited track event dates, non-live efi tuning ....... it will be a while

**snowvette** · 06-08-2013

This thread usually pick up on the weekends.

**Gh0st** · 06-08-2013

Like I mentioned, I have ZERO time to do anything in my life. Wife works until 8:30 at night and I'm watching my son until then. The weather has been pure ass too, nothing but rain. Figures, weather is clear but my parents are coming from out of state to visit this weekend. Never ending cycle

**Gh0st** · 06-08-2013

Originally Posted by cobaltssoverbooster

its not dead. people are busy and progressive developments take a long time especially when your going one table at a time with as many as there are available to you guys now.
EX: The LNF came out in 2008 mid year and i still make minor finds here and there. The major finds didnt really get finished solid till maybe 3 years after support was released which was late 2008.

now factor in delays for price restricted dyno time, cops, limited track event dates, non-live efi tuning ....... it will be a while

Yep. Nearest 1/4 is about 2 hours away from me, so it makes getting some runs in really difficult. I'm not quite ready for the dyno yet and would probably need to borrow it for an entire day to answer all the questions I have.

**cobaltssoverbooster** · 06-08-2013

well last year with my new ported head i spent an entire week strapped to a mustang dyno doing steady state testing and fixing camshafts and dals to optimize power usage through the entire load range. i never unstrapped it, just poured gas into it and made sure the fans were cycling air properly. since i know the price of my bill wich was even at a discounted price i do not see people spending anything near the time i spent lol. it hurt really bad paying that bill...thats all ill say.

**rallycar2001** · 06-08-2013

well i feel good about what i have now. and i have a sonic rs manual 1.4l turbo im gonna be testing and tuning.

**Gh0st** · 06-09-2013

Originally Posted by rallycar2001

well i feel good about what i have now. and i have a sonic rs manual 1.4l turbo im gonna be testing and tuning.

Hope you figure some cool stuff out!

**Gh0st** · 06-10-2013

I may have some time today as long as the weather holds to try seeing what effect playing with the cam timing has. Also strongly considering using the 2013 cam tables too and seeing how the car runs.

**Gh0st** · 06-11-2013

Yeahhh.....don't use the 2013 cam tables. It didn't sound good when going WOT and my car also went in to the low octane timing table for some reason(once again getting a lot of knock around 2000rpm just cruising), might be part of why it didn't sound good too. I may still mess around with it as the non-wot driving felt smoother.

In regards to the knock around 2000rpm. I keep seeing this every time I flash a tune, it's as if the car is just running way too lean right there and once the fuel trims kick in, the issue goes away.

**Gh0st** · 06-11-2013

You guys think this is a good indicator of the turbo's compressor map? I can't seem to get Garrett to give me the info

Looking at an old log, I'm hitting 1074 lb/hr @ 232kpa. That's roughly...what...2.32 pressure ratio? I'm not good with this stuff

Looks like 225-230kpa is the sweet spot for efficiency if this table is to be believed as fact.

**Gh0st** · 06-12-2013

Wow...if you want to stay out of the hospital for whiplash, do NOT set your Pressure Delta Factor table to 4 across the board. Boost ramps up fast when going WOT and then I hit some crazy ass limiter that makes the car jerk back and forth like crazy. Holy shit.