Ive had my car on a overkill tune and was great as i first installed it with a 3.6 i had blips of kr at the top of shifts as it was still 100 plus here.. but now that its now 53 out the car runs like a rape ape then before i would get funky kr blips just from leaving stops an randomly while cruising the same speed an rpm, so i changed plugs, pcv valve looked over wills tuning paper work he sends out with the tunes and i realized it tuned for 93+ and we dont even have 93 here let alone the 91 is like 89 so i got some torco race concentrate and made some 94-95 gas an holy moly its even better NO kr what so ever even pt kr is no more..

but lookin at some info on my scan gauge im at 11.8 boost my af is at 11.5 i think an my wot timing adv is 16* which if im wrong seems quite low?

What are your thoughts?

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04 Comp G... ON METH 3.5-3.6, Headers, intake, Overkill/street tune, gxp brakes, and every suspension do-dad lol
OLD PB 1/4mile in 14.07 at 98mph!! 2.0 60ft

afr without a wideband doesnt mean much thats more than likely commanded AFR. For the wot timing stock is 17. but it sees one blip of kr it drops. he may have actually pulled timing to get ur afr closer to have no kr possibly,

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Dave's Hocus Pocus Tuning of South Dakota

Well i finally fixed the kr issues my car had, i had a bad mount causing false kr. Also i made some higher octane fuel that is right around 94-95.. so i flogged the hell out of it an still saw none.. so what the hell i put the 3.5 a now i make just over 13psi at wot and no kr..

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04 Comp G... ON METH 3.5-3.6, Headers, intake, Overkill/street tune, gxp brakes, and every suspension do-dad lol
OLD PB 1/4mile in 14.07 at 98mph!! 2.0 60ft

16* seems reasonable for a gen v on a 3.5 with those mod's and that afr. . . at least for a mail order tune. You may be able to get away with 18* or so but there's no way to tell without an in car tune. You can only go so far with a boxed tune unless you have a way to scan an experiment.
and FWIW, when running 91oct and a 3.4" i can only get away with 18* and still get a few degrees of kr . . .and i've got rocker's

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Comp G: 3.2-E85-65's-headers-rockers-104's-DHP tune & "other stuff that doesn't matter"

Also keep in mind that the winter blend gas for the colder weather can cause some issues with KR and afr. and that timing is probably correct. Like T-unit said you need to closely monitor with a Wideband and an Interceptor gauge/datalogger to push the limits of timing.

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CobaltSS.net Moderator