Hey guys I have a friend with a cts-v that we just install headers, CAI, 95lb injector and 2.4 Pulley, at over 6200rpm the car will hesitate before the shift and would like to know by whoever has more experience with this setups if what we are looking at is spark blow out? Car has BR7 gap at 25... thinking it must be since you can see after the miss that the afr goes to 10.6 and then back up to 11.4 thanks for the help.
Here is a scan log...
It's possible that it's spark related but you are also maxing out the MAF sensor airflow, it gets pegged at 86lb. You really need to increase the intake tube the MAF sits in by atleast .5 inches to gain back some and not max out the MAF.
You can log each cylinder for misfires if you think that's it too. Also commanded AFR doesn't match actual in PE, showing that a lot more MAF and VVE tuning is needed. Fuel trims outside of WOT are all over the place too, several times going way way positive at +20.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
Tune would help, but from what I'm seeing with it going richer and boost nose diving it's either hitting a boost limit or your logging the wrong tps and the throttle is closing. Typically with a misfire boost will sky rocket for a second and yours is nose diving. I bet it's just a boost limit that you need to raise... Seems to do it when it hits 191kpa...
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
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Make sure in the tune the Map disable is set to 250kpa and Map enable 240kpa.
2013 OBM A6 CTS-V Coupe
Mods: Headers back Billy Boat Exhaust, GripTec 2.65, 8.6 PowerBond Lower, LSX Innovations Solid Isolator, ID850's, NGK TR7IX's, Accel 9070CK Wires, Spectre CAI, SRI Ported Throttle Body, SRI Catch Can, NGK AFRM, 160* T-Stat, 0fx2gv Brick, Hard Line Delete W/3/4" Lines, FB 101 FMIC, Pierberg CWA50, Stoptech Drilled/Slotted Rotors, EBC Redstuff, Cut Stock Springs, Flat Bottom Steering Wheel
2006 Black Raven STS-V (Traded In)
Fully Modded: 459RWHP@5888rpm/451lbft@4696rpm
You shouldn't be blowing the spark out with 7's with the gap at .025"......
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From what I understand about WB sensors is they read lean when raw fuel is dumped out the cylinders so a miss or spark blow out should raise the AFR
EDIT: First thing that drops out is airflow, followed by map and then fuel... Hard to figure out with it clipped at 5201 lb/hr. Possible a simple boost leak/belt slip?
Last edited by NJ_Phil; 06-05-2017 at 02:54 PM.
2012 C6 Base, Kooks 1-7/8" LT, Catted, NPP
Novi 1500SL, 10% OD IW, Big Blower Cam, Flip Drive, 2x Alky, ID1000
Nitto NT05R 305x19, 255x18 on CCW T10s
Self built and tuned https://www.youtube.com/watch?v=Kod2UTqrVwM
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