Begi issues; whos had em? Howd you fix it?

[bradnic]

yes saw that. MTX cheaper than an LC-1 with a G5 gauge, which is what I mentioned in my last post. as described earlier can't use the MTX. That amazon price for LC-1+G5 was about $10-15 cheaper than ebay.

thx jaywood

[bradnic]

LC-1 installed and calibrated, spliced in to the O2 sensor harness. O2 relay is jumpered per the install guide. using the analog output for the ECU, with the adjusted voltages.

AFM was waaay off running super lean (23+). got it tuned in to idle at 14.4-14.7. Car goes way rich to 8 or so on accel, then goes super lean when you let off (indicator goes full clockwise, then LC-1 reading goes off line in the logging software until you open the throttle a bit).

finally have something to work with here. will tweak the begi's needle valve and see what that does to the lean condition.

thanks for the advice guys. long way to go still but at least we're moving forward

[nrubenstein]

LC-1 installed and calibrated, spliced in to the O2 sensor harness. O2 relay is jumpered per the install guide. using the analog output for the ECU, with the adjusted voltages.

AFM was waaay off running super rich. got it tuned in to idle at 14.4-14.7. Car goes way lean to 8 or so on accel, then goes super rich when you let off. finally have something to work with here. will tweak the begi's needle valve and see what that does to the lean condition.

thanks for the advice guys. long way to go still but at least we're moving forward

Wait, uh, 8 is rich, not lean.

[bradnic]

wow, well that's a problem. it is air fuel ratio, meaning air / fuel. so larger is more air. talk about a brain pause. I edited the previous post.

[bradnic]

did some initial tweaking of the needle valve on the begi. when stopping at a light after a steady cruise the car goes lean (16-20) then tunes itself back to stoich in about 15 seconds. car's not stalling at idle anymore. I did a few third gear pulls on the freeway, car's still running lean under boost (18-22), rich off boost (8.5-10).

So it seems I'm getting too much air at idle right? Should I dial the AFM leaner to take care of the off boost richness? will the ECU adjust the idle to stoich in that case? I read where there is an idle air adjust screw on the AFM, but is that on US cars?

as to the severe lean condition under boost, will hit the needle valve again. not sure what else to do about that except maybe dial back the boost? it's at 6PSI right now so not exactly excessive

thanks again for your help and comments

[jaywood]

18-22 during boost? 6 psi? WOW, that is incredibly lean. What size injectors?

[FLG]

What jay said.. And don't keep doing pulls unless you get that taken care of asap or you'll be melting pistons in no time

Sent from my Galaxy Nexus using Tapatalk 2

[bradnic]

Yeah it's definitely lean on boost. Very concerned obviously. Like I said earlier though only running 6 psi. PO installed "24lb older mustang injectors" - his phrase. Gonna try dialing up the fuel pressure on the begi first. It's at 45PSI at idle right now though.

What about the rich condition off boost, and it idling at 14.7 now?

To get everything right it seems like I need to do the following
The first 2 steps should get me good idle and off boost AFR.
1) find an idle air screw on the AFM and dial back the air to make it richer
2) lean out the AFM some more to get off boost corrected
Still leaves the most important part - on boost
3) try to 'dial up' the begi to be pushiing a boat load more fuel under boost

assuming I can do this with the current setup I should be ok. Otherwise guess I'm gonna need new bigger injectors.

Need some advice here

[bradnic]

btw I found this in the begi instructions: "The pump pressures needed to run the rising rate regulators are relatively high. Anticipate the need for pump outputs of approximately 100 psi to operate the typical aftermarket turbo/supercharger system. ."

I set fuel pressure at idle to 45PSI per jaywood's note earlier in the thread. seems like it should be higher? anyone running higher fuel pressure? I assume the fuel pressure rises with boost above that number?

[jaywood]

What EMS are you running?

I had zero issues with having my fuel pressure at 45psi on idle. Under boost the fuel pressure increases hence the 100psi, so that isn't your problem.

The AFM screw...no need for that. You only need to adjust the AFM wheel.

[bradnic]

I'm running the stock ECU but thinking about adding an ostrich at some point.

thanks for confirming the fuel pressure side of things. will lean out the AFM per 1 and 2 above and see what happens from there. as to getting more fuel under boost, I don't know what to do right now. Will obviously stay off boost until this is sorted out. Will take another look at the needle valve.

[jaywood]

Are you sure you have 24lb injectors?

[bradnic]

haven't pulled them to verify. just have the POs word that they're in there.

[jaywood]

I'm stumped.

Maybe another member has some better input than I do! Good luck ;)

[bradnic]

bummer. guess I'll go hit m42club or e30tech
thanks for getting me this far though!

new thread on e30tech: http://www.e30tech.com/forum/showthread.php?t=115716

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