Re: Bypassed Factory Fuel Regulator
I truly feel for you guy's. All these post regarding fuel pumps and regulators.... chasing lean conditions.... I sure hope you can get it all squared away.
A little refresher - - When I installed my 185mm pulley back in Feb 08 (the first guinea pig to buy and try the 185) I was so worried about running lean that I stayed off the throttle until I could get the SRT in for a Dyno tune.
Much to my surprise, I even pulled my dyno sheets tonight to re-confirm and give you straight data, I was running PIG RICH with the factory tune. 10.4 to 10.8 AFR at rev limiter thru the entire power band on the factory tune.
BTW - I had the SL55 intake and a set of NGK BKR7EIX-11 Iridium plugs installed. (Package deal from LET when they first started business - don't ask about the killer deal I got - you'll only cry) - No other performance mods installed.
My AFR was monitored with a Wideband sensor set as far up the tail pipe as possible and also with the STAR diagnostic system (factory sensors) they had at the shop.
After all the pulls and adjustments I ended up at 12.6 AFR and gained +26 HP thru the entire band.
In fact, comparing my last pull (Run #20) with my first pull (Run #1), where the AFR graph begins to climb from 11.2 up to 12.6 AFR and stays rock steady for the last 3/4 of the pull, is the same point where the HP graph climbs and stays a consistent +26HP above my first run.
My point is that if guys are running lean with all sizes of pulley's - perhaps it's your:
1) Tune - maybe in the zeal to provide the customer with a big HP gain, your ECU has been over tweaked and now you run to lean.
2) Fuel pump - perhaps it's getting weak (especially at the top end) - I was tuned at approx 2,000 miles if my memory is correct, so my pump was still fresh - with only 18,000 on the clock - I'm pretty sure it's still 100%.
Good luck, I hope you get it all figured out.
Last edited by BrianBrave; Jan 12, 2010 at 10:36 PM.