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Just got my A/F with 75 Shot !!!

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Old 11-21-2011, 07:05 PM
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Default Just got my A/F with 75 Shot !!!

Well i just installed my A/F Gauge and did a couple of runs but with about 800psi bottle pressure just cant get it any higher in this cold weather. So i thought i should run rich since i have less bottle pressure and usually tuners will tune for about 900-950 bottle pressure, not sure just assuming. I was at about 13.2-13.4 at about 5000rpms and just let off at that. From 3500-4800rpms i was getting anywere from 13.2-14.0 a/f then when i hit about 5k i paused looked real quick and let off and it read 13.2 a/f but again it was 13.2-14.0 from 3500-5000rpms. This was on 800psi bottle pressure and on 75 shot. Does this sound way too lean, especially with that low of a bottle pressure?
Old 11-21-2011, 08:51 PM
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I would check your fuel pressure and injector duty cycle. Just going off a wide band (which I dont recommend) your to lean. Did you happen to look at the plugs?
Old 11-21-2011, 08:56 PM
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no i havent looked at plugs yet at all. Which one should i look up all or just a certain plug.
Old 11-21-2011, 10:58 PM
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Originally Posted by karpetcm
Well i just installed my A/F Gauge and did a couple of runs but with about 800psi bottle pressure just cant get it any higher in this cold weather. So i thought i should run rich since i have less bottle pressure and usually tuners will tune for about 900-950 bottle pressure, not sure just assuming. I was at about 13.2-13.4 at about 5000rpms and just let off at that. From 3500-4800rpms i was getting anywere from 13.2-14.0 a/f then when i hit about 5k i paused looked real quick and let off and it read 13.2 a/f but again it was 13.2-14.0 from 3500-5000rpms. This was on 800psi bottle pressure and on 75 shot. Does this sound way too lean, especially with that low of a bottle pressure?
WAAAAYYY too lean!!!!!!!! At the AFRs you are talking about an engine with no nitrous would have problems. Get a basic tune up.
Old 11-22-2011, 12:31 AM
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Originally Posted by 03EBZ06
WAAAAYYY too lean!!!!!!!! At the AFRs you are talking about an engine with no nitrous would have problems. Get a basic tune up.
I do agree, i did a small vid i know the quality is definitly not there but i did the best i could. On one of the runs i had the bottle closed and turned the switch on to the nitrous so it activates the nitrous tune and i could tell that the tune was definitly kicking in meaning it seemed like it was running rich and timing was pulled because it didnt pull good at all which is expected since its a nitrous tune but im thinking it needs way more fuel and told my friend the same thing if it was N/A at that A/F i would be worried so on nitrous im shocked nothing serious has happened. This vid is with 800psi bottle pressure at 75 shot ill post it once i get it on the pc.
Old 11-22-2011, 09:09 AM
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Here is the vid

Old 11-22-2011, 10:12 AM
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what u doing to add fuel? just pointing the nozzle at the maf or do u have a controller?
Old 11-22-2011, 11:12 AM
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You should be shooting for about 11.5 -11.8 on the afmeter. You are way lean. Jet up and check your plugs after the next try.
if you are running a dry shot you need to find out why you are starving on fuel, if a wet shot then like I said jet up on the fuel.
Old 11-22-2011, 01:18 PM
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its a dry 75 shot, i have a tune when you flip the switch on for the nitrous it will switch to a nitrous tune. I know the tune works for nitrous because with my nitrous bottle closed and the switch on to the nitrous the car runs like crap too much fuel and timing pulled doesnt pull well at all. I think i need to send it back out to have him add more fuel if that doesnt work then my injectors are maxed out i think.
Old 11-23-2011, 04:12 PM
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One pic ive circled the hole and the other i have not just in case.


This pic is also how the hole is oriented in regards of the MAF. I think its fairly even since the MAF angles downward but probably can go a tad higher. I was told that i may also get a lean condition due to the fact that its not facing the right direction or orientation. I think even if its a tad off it shouldnt read 13.2-14 at 800psi bottle pressure with just a 75 shot but again once the bottle pressure hits 900-950 it hits hard and pulls very well and experimented with the orientation of the hole and thats the best as far as i can get it, plus it will more then likely run even leaner at 900-950psi as well. My tuner suggested to me that i should do something with the nitrous solenoid which indicates to me he thought this was a WET system and maybe tuned it for a wet system and not a dry.
Old 11-23-2011, 05:05 PM
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im gonna say your really really close to maxing the injectors especially if your in a good DA. get some FAST 42lbs
Old 11-23-2011, 05:20 PM
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I had some ford svo 32's should've kept them. Ill see what frost can do with the tune im thinking he thought it was a wet system and hardly added any fuel compared to running dry. If it doesnt work ill be upgrading the injectors.




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