Are you talking about a straight up aem ebc or just a gauge? I originally had a mbc installed along with a mech. boost gauge. Later on I got a blitz ebc put in and I still have my mech. boost gauge in the car. I've got the boost gauge in a steering column gauge pod so it's really easy for me to just barely glance down and check boost levels. My ebc on the other hand is to the left of the steering wheel right above the a/c vent. So I just left my boost gauge since it's easier to see.
But anyway from my experience with my ebc, it's been more accurate than my gauge. Cool thing too is that it's got a peak function, so the ebc shows how high boost went up to. whereas the gauge's needle just drops back down.
I believe I have the same one, the AEM Tru boost gauge/controller. I have a 3 bar map sensor hooked up for my alky kit and the numbers off of it and the aem usually match, which is good since the map sensor is more accurate than mech gauge. What value did you guys use for stock wg pressure? I'm sure you know but it will remain open until the set wg value is exceded for quicker boost response, I've had pretty good luck with 13 psi, I've notice my boost spikes are less defined, I still can't hold a set value to redline but there is less taper.
11.5 sounds about right, otherwise you may get to much of a spike. Others have set that and a 60% Duty Cycle to get a solid 23PSI, that is what I will try and I will post results. I just like the fact that it uses a MAP to read and control boost, that is VERY nice and the most accurate you can get. This mod may bypass the MBC in terms of being accuate and ease of use.
I got mine for $200 brandy new, well worth it and as much as a MBC/Gauge combo.
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