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Low BLM#'s

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Old Jul 3, 2007 | 11:59 AM
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Low BLM#'s

Ok this may be a bit of a dumb question but if I understand what i have read, If i have a blm of 108 that means that I need to reduce my Ve tables in that area by 1.19 right?? I keep reading that this means the ecm thinks that there is a rich condition and it is removing fuel?? is that right?? So that would mean the the more efficient you have your Ve tables set to the more fuel the ecm will add?? Example- If my ve is say 65 at 1200rpm at 50map and my blm is 108 that means that I should reduce the Ve table to 54.62 and that should correct the blm to something a little better right?? Thanks for helping out a newbie
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Old Jul 3, 2007 | 02:16 PM
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Re: Low BLM#'s

yeah, that sounds right.
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Old Jul 3, 2007 | 02:29 PM
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Re: Low BLM#'s

THanks just wanted to make sure that Im making the adjustment in the right direction. I appreciate All the help you guys give me. Its getting easier but still not there yet!!! Its fun though.
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Old Jul 3, 2007 | 03:37 PM
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Re: Low BLM#'s

It's kinda like bracketing with artillery...

drop 400, add 200, drop 100, add 50- fire for effect
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Old Jul 3, 2007 | 03:45 PM
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Re: Low BLM#'s

LOL thats funny. It would be much easier with a laptop to datalog with, but I cant seem to find one yet. Oh well the wife is getting used to driving the truck finally!!!
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Old Jul 3, 2007 | 04:00 PM
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Re: Low BLM#'s

right on.

nothing like chicks with trucks lol
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Old Jul 3, 2007 | 04:10 PM
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Re: Low BLM#'s

I see that you have gone the ebl route?? It must make life alot easier?? I will go that route as soon as i get the hang of this. Take it easy. NICE truck!!
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Old Jul 4, 2007 | 11:23 PM
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Re: Low BLM#'s

Not to hijak, but my 93 LT1 is showing low BLMs like this at idle. Now I have a stroker and a 230/236 cam, so would doing the same thing you did raise my BLMs? And help get rid of the fuel smell(LT's no cats).
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Old Jul 4, 2007 | 11:41 PM
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Re: Low BLM#'s

My engine won't idle in closed loop...the O2 keeps registering rich and the computer wants to pull fuel until it surges like hell.
I switched to open loop idle and it works well...I think it's the cam profile with mine, probably the same with yours.
My cam is 212/222 at .050
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Old Jul 4, 2007 | 11:51 PM
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Re: Low BLM#'s

Just so you know my cam is 212/218 duration and I have no problems idleing in closed loop/ exept for the headers cool of the o2 and it switches back and forth depending on the exhaust temp. Steve40th I'm not good enough at tuning to give you that kind of advice. But I would think that you could reduce your ve's at idle and see what happens. What fuel pressure/bpw are you using??
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Old Jul 5, 2007 | 12:22 AM
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Re: Low BLM#'s

don't know if you're talking to me, but I have 15 psi through 90's, BPC 88
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