2014 CTS-V going catless

I'm going to be installing b&b test pipes shortly. Main reason is i dropped down to a 2.35" pulley and don't want to run the risk of burning them up. Guys that have done this, are you able to run a few more degrees of timing at WOT than WITH cats? I'm currently at 16* at WOT in the upper rpms with a 2.55" on 91/93 octane (which seems pretty normal). I know i can always trial and error this, but i'd figured i'd ask first. thanks

Less exhaust restriction can lead to more ignition timing

That's what I figured, just wanted to get some feedback from someone who has done it already

16* on 93 seems low. On 93 and catless I'm at 20* on E85 it's 27*

With my C6Z06 twin turbo I also significantly leaned out my fuel curve especially during idle

I'm at 16.5 on 91 in AZ with cats.

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Originally Posted by asteggall

16* on 93 seems low. On 93 and catless I'm at 20* on E85 it's 27*

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occasional 91 octane goes in too. 16 is above 4000 rpms i believe ( i don't have my tune in front of me at the moment).

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Originally Posted by ttz06vette

With my C6Z06 twin turbo I also significantly leaned out my fuel curve especially during idle

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i will take a look at this once i install them....thanks

Quote:

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Originally Posted by sgod1100

occasional 91 octane goes in too. 16 is above 4000 rpms i believe ( i don't have my tune in front of me at the moment).

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Dealing with 91 sucks.

also, do any of you guys know which codes to disable in hptuners to prevent the CEL from popping up? I know i can disable any of the cat testing but i wasn't sure which codes to set to "NO ERROR REPORTED". Do i just disable anything that has to do with the "sensor 2" included in the description?

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Originally Posted by sgod1100

also, do any of you guys know which codes to disable in hptuners to prevent the CEL from popping up? I know i can disable any of the cat testing but i wasn't sure which codes to set to "NO ERROR REPORTED". Do i just disable anything that has to do with the "sensor 2" included in the description?

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You got it anything to do with sensor 2.

sounds good, thanks

Quote:

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Originally Posted by asteggall

16* on 93 seems low. On 93 and catless I'm at 20* on E85 it's 27*

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Just revisting this..How much boost are you running with these numbers? Are you on a stock lower with a 2.35 upper like me? You have headers?

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