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Re: Monte Smith ? [Re: MR_P_BODY] #1713353 12/21/14 06:31 PM 12/21/14 06:31 PM
Joined: Jul 2010 Posts: 1,491 Oologah, Oklahoma Big Squeeze pro stock
Big Squeeze pro stock Joined: Jul 2010 Posts: 1,491 Oologah, Oklahoma	Quote: I understand what your saying.. If you find out what the car runs the fastest THEN you take the reading so its easy to get back to that A/F reading.. we have found that a engine runs the best(for power) somewhere around 12.5-13.0(but not always) so the O2 doesnt know where the peak is at Exactly....some intakes are worse about distributing fuel unequally to each cylinder so they have to be richer to compensate and get enough fuel to the leanest cylinders....I remember someone telling me that on one of Dudek's older FAST builds he had to be in the high 10's A/F for max power.... If you can't handle the truth, you're living a lie.......

Re: Monte Smith ? [Re: Big Squeeze] #1713354 12/21/14 06:48 PM 12/21/14 06:48 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY OP Master
MR_P_BODY OP Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Exactly....some intakes are worse about distributing fuel unequally to each cylinder so they have to be richer to compensate and get enough fuel to the leanest cylinders....I remember someone telling me that on one of Dudek's older FAST builds he had to be in the high 10's A/F for max power.... A buddy of mine owns Dudeks car and Dave was with him on DW.. they had a HARD time trying to find power in the heat... I heard yesterday that HRM was doing a big pic display and interview on the car of it on DW.. I was surprised as how poorly it ran.. but its one of the FAST cars

Re: Monte Smith ? [Re: MR_P_BODY] #1713355 12/21/14 07:18 PM 12/21/14 07:18 PM
Joined: Feb 2011 Posts: 4,302 Nebraska 72Swinger master
72Swinger master Joined: Feb 2011 Posts: 4,302 Nebraska	My Dart liked the Fast EZ Efi at 11.8 AFR WOT. The difference between that and 12.2 were noticeable. Mopar to the bone!!!

Re: Monte Smith ? [Re: 72Swinger] #1713356 12/21/14 07:23 PM 12/21/14 07:23 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY OP Master
MR_P_BODY OP Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: My Dart liked the Fast EZ Efi at 11.8 AFR WOT. The difference between that and 12.2 were noticeable. I hear ya.. there is no magic number like a few on here think there is

Re: Monte Smith ? [Re: 72Swinger] #1713357 12/21/14 07:33 PM 12/21/14 07:33 PM
Joined: Feb 2005 Posts: 4,314 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,314 Prospect, PA	Quote: My Dart liked the Fast EZ Efi at 11.8 AFR WOT. The difference between that and 12.2 were noticeable. On the engine dyno, mine was in the 12.1 to 12.4 range for best power and that was testing with 3 different intakes and two different carbs.

Re: Monte Smith ? [Re: MR_P_BODY] #1713358 12/21/14 07:59 PM 12/21/14 07:59 PM
Joined: Jan 2005 Posts: 2,540 Milwaukee WI T TRENDZ master
TRENDZ master T Joined: Jan 2005 Posts: 2,540 Milwaukee WI	A narrowband sensor will tell you if the ratio your running is making the engine happy. I had the benefit of running both a narrow and wide band sensor at the same time. I found the ratios my engine liked were dynamic... Generally richer below tq peak rpm, and leaning as rpm would rise. A narrow band sensor will not have any "true" value as a ratio indicator, only as a "happy" monitor. As an example, lets say I'm running the engine at a wide band confirmed 12:1 ratio. I look at the data logs, and look at the narrow band output voltage. If you see amplitude spikes(high/low) the engine wants something different. Add some fuel, log it, than look at the amplitude again. If the voltage line is smoother, keep moving in that direction. If its worse, go the other way. A smooth output voltage line is the goal. Just ignore any other part of the info you get from this. voltage value is of no value with a narrow band outside of 14.64:1 ratios. Bottom line.. A wideband will tell you where you are. A narrow band will tell you if you should be there! "use it 'till it breaks, replace as needed"

Re: Monte Smith ? [Re: TRENDZ] #1713359 12/21/14 08:11 PM 12/21/14 08:11 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY OP Master
MR_P_BODY OP Master Joined: Jun 2003 Posts: 52,972 Romeo MI	I never tried to run a narrow band on a race engine but it might be something to look at

Re: Monte Smith ? [Re: MR_P_BODY] #1713360 12/21/14 08:39 PM 12/21/14 08:39 PM
Joined: Nov 2004 Posts: 6,890 North Alabama M Monte_Smith master
Monte_Smith master M Joined: Nov 2004 Posts: 6,890 North Alabama	Our 4 stage, dry nitrous 738 runs to a target A/F ratio of 12:8.1. That's where it runs the best and the plugs come out REALLY clean. Richer slows it down. We have been 178 in the 1/8 on 4 small kits Monte

Re: Monte Smith ? [Re: Monte_Smith] #1713361 12/21/14 08:48 PM 12/21/14 08:48 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY OP Master
MR_P_BODY OP Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Our 4 stage, dry nitrous 738 runs to a target A/F ratio of 12:8.1. That's where it runs the best and the plugs come out REALLY clean. Richer slows it down. We have been 178 in the 1/8 on 4 small kits Monte Monte.. read up a few post and see what I said about the Global down load.. thanks

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