jpknobel

Thanks Roland, appreciate it. Yeah its a billet centre feed intake. I chose centre feed over front feed as i figured its inherently more likely to have a more even flow due to the centre feed design than a forward facing design. Photo of manifold attached if you were interested.

Sorry, yes, closed loop O2 control is what i was meant to say. I don't currently have a way to datalog wideband against any of the pcmtec data unfortunately. The car drives okay while its sweeping i just wasn't sure how wide of a sweep was normal. I verified the in car wideband against my portable wideband (LM2) and my dyno and they all seem to correlate (close enough anyway as dump pipe sensor vs tail pipe). I might continue tuning with closed loop O2 off so i remove that factor and when i'm done ill just re-enable. The only other question I had which is probably off topic is to do with the aftermarket intake manifold. What data would you expect that i need to change to account for it? Thankyou for your help mate, its appreciated.

Hi Roland, I'm not sure if this is the right place to ask but it's relevant and may assist others in future. Please let me know if this isn't the right place. Im using PCMtec Pro and also have HPtuners. (i usually tune diesels and have only done a small number of petrol tunes (not for paying customers). Have a FG XR6 that has just been turbo'd (is an NA motor) and has the following relevant mods: - Custom Alloy Welding billet centre feed intake manifold - Raceworks INJ-213 Injectors (1100cc at 58PSI) - 4" turbo back exhaust - Walbro 460 pump with a Turbosmart FPR800 reg set to 58PSI - Innovate wideband I have setup (taken a preliminary guess) some blending between tables of the NA calibration and a factory turbo calibration in terms of timing and fuelling. I've copied over most speed density, cam control and whatever else may be partially related to the current tune from a factory turbo tune. The issue i am having is unstable AFRs. I believe this is due to my injector data being off (raceworks supplied) however am unsure. If i disable closed loop O2 control my idle and light cruise at 100kmhr AFRs maintain target AFRs close enough at this point (assuming some SD stuff will need tweaking due to intake manifold). The main issue i am seeing is when closed loop boost control is enabled my AFR gauge swings between 13.5:1 and 15/16:1 and will do a full swing once every second or two. I have attempted to log relevant data as you have previously described but it doesn't look that far out (i may be interpreting this completely wrong). Do you have any pointers for me please?