2008 SRT with KB Mammoth Arrington build going dead rich at 4000 RPM.

[GDI Tech]

Turbo 400 trans, Starts and idles great, on C16, drag only, and A/F is good until it reaches around 4K RPM and then goes dead rich 8:1 range. Totally stumped on this. Plugs are gapped at .019 so don't think its spark blow-out, new plugs, has been through a few shops before coming here. On the the track same thing. Launches awesome and then falls on its face pig rich. Can share log and tune with anyone interested in studying this.

A few things were not sure on, it has 7 O2 sensors instead of the normal 2 upstreams. So that we have not figured out either what the rest are doing as there is no wideband gauge in the car. We have the AEM sensor in a bung for logging. Par throttle is good A/F.

Any ideas?

Thanks in advance.

https://hosting.photobucket.com/imag...MG_3406_1_.JPG

[SultanHassanMasTuning]

post the file

[PurpleRam]

7 O2 sensors ? I can see 8 , one for each cylinder, that's how I run my 496G2 hemi in my 78 Midnite Express truck , one for each cylinder ... ... but 7 , are they 1 set in the top of the collector, 2nd set bottom, towards the end of the collector , near the Flange ? next set down stream about 18 inches away from the collector/exhaust pipe flange.....and 7th I have no F---ing idea on that one. My 05 GTx Ram and my 04 GTXram I run 6 on each of those trucks, , 2 per side like I described above, the 05 I run 6.1 based 392,G3 which is a honest 8-9k rpms deal , the 04 I'm running a 454CI BGE which turns in the low 8k, I built an 04 Rumble bee a few years back I did the 6 o2 deal that has a 468G3 with Thitek heads ,Jessel solid lifters .755/725 280/284 @.50 LSA: 108 Custom ground LSM cam. Drag pak Intake , a Sonny's TB we gave up trying to run any of these monsters on the OEM stuff....Picked up 1/2 sec switching to Haltech on my 04 . the 04 Bee redlines 7800 and the OEM PCM can't handle the Fuel/spark requirements to keep up so......it's getting an R8 EFI Technologies system in the next month.

you say "KB Mammoth Arrington Build" ? are we talking 440-468 CI ? if so it's still running a factory ECU ?


Just looked at the Photo , KB= Kenn Bell ?