Quote:
Originally Posted by in-san-e
Bob,
I have just recently fiitted a new set of RC 550 injectors. Previously the car had 510cc injectors from an EVO 3, with these in it ran fine, with a nice clean steady idle and virtually no need to make any adjustments to fuelling other than the mainscale which was at -29.5.
After putting the 550's in I pulled the mainscale back some more to -34.5. This however resulted in the car running very lean, off the AEM gauge at idle!! with the Pro indicating an AFR of 19!! I had to reduce the mainscale adjustment back to around -14 to get the AFR at 14.5 or so.
From here I re-set the mainscale to a correct -34.5 and started to re-tune by adding fuel in all of the load pages. This has improved things no end, but I have a remaining problem, an answer to which so far eludes me.
When I lift off the throttle completely while the car is moving and still in gear, the AFR goes very lean, at around 17, if I apply a small ammount of throttle, the AFR picks up to around 14 or so. I beleive this problem is related to TPS and manifold pressures and my not having something set right in PT tracking, or am I way off with this?
Any help would be much appreciated.
Best regards,
Steve
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550's here, but not running anywhere near the mainscale your running. I think I'm around -28 while still adding fuel all over. Zero out your tune pages and start resetting the mainscale til you got decent running. The fine tune with the low-med-high maps. My car likes lotsa fuel, yours may vary.