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What is going on with 87 octane is it starts to knock a little then the computer moves toward the low octane table. Then after a few seconds of no knock it tries moving back toward the high octane...

I see what you mean now about the 2 pumps. From what I saw the 10027 was used on a wide variety of GenV engines of all sizes. The 10113 was only used specifically on 5.3l engines like it says with an...

I work for GM and the regularly change part numbers on stuff even in the same model year. I doubt there is any difference in the pumps at all. More than likely they cross reference to each other....

Yeah this should be in the Gen4 section

If the fuel lobe on the cam is any more than about a +10% you would need a lash cap for the hpfp unless you are using a lt4 hpfp. Without the cap and an aggressive fuel lobe it would sound just like...

The LT5 cam works perfectly fine in a L83. It makes them pretty fun.

I wonder how much of this would apply to turbochargers in a truck with an E92. I would love to have boost control from the ecm.

I knew about the other ect tables but I never bothered to try and find them.

Heck I run mine mostly on E85 and get up to 265 kpa on the map sensor. At my altitude that equates to 163 to 164 kpa of boost. She absolutely screams with the zzp cam, valvesprings and a big wheel V3...

Funny thing is at one time ZZP actually had the duration and lift specs for the new cam. The exhaust side is just a flipped intake cam. That cam has more lift and somewhere around 10* more duration...

Most likely false knock. The 1.4 has fairly noisy valvetrain. The lash adjusters in them definitely leave something to be desired. My Cruze started doing the same and in my case it's definitely a...

Any updates on this HPTuners

I wish there was a master enable/disable for DFCO in my 15 Cruze.

I put a Circle D in my 6L80 rebuild and I love it.

I had to put a lot of fuel in while cranking when I did an e85 conversion. It took me a couple of times to get enough to where it started right up and stayed running. Way more enrichment than what I...

Yeah the stock torque converters are hot trash. My truck had had on replaced and it failed, with the stock tuning of course. I pulled the trans out had it rebuilt, with updates and much better...

I just looked at the PE on mine and it's like wow. There is absolutely no reason a NA engine should be in the 10.8 to 10.9 afr range. Heck you only need mid 12's under load NA to be perfectly safe. ...

Is it ok if I take a look at what you did to your 2015? My tune is stock except for minor changes to the driver demand to not make it so dead pedal feeling and changes in the trans tune.

You can experiment with it. I wouldn't change anything below 15% pedal. Make small changes not more than adding a couple percent at a time to bring power on faster. I wouldn't worry too much about...

Check out Richard Holdners dyno testing of the Truck Norris vs the SS2 on YouTube.

The truck norris cam makes alot more low end torque than a sloppy stage 2 and nearly as much up top. I would start with stock and use your other tune as a point of comparison.

You can make the throttle a little more responsive by slightly increasing the values in the driver demand tables. Just don't change anything in the very low pedal positions or it will not want to...

I can't say for sure if they are or not. It is easy to verify if they are if you have the stock tune file. I know I have a copy of the stock 2012 1.4 Cruze automatic in the sample tunes. You could...

Yeah I understand. Going back to the stock maf table. That is actually in the sample tunes that I got when I installed VCM Suite. I doubt you would ever see one of these cars go lean under load...

Every maf I have seen, in any car, all vary from car to car. Mine was lean below 20 grams/second and gradually got richer as flow went up. So essentially it read lower than actual flow at low flow...