ColoradoBrad

I logged a few more runs after installing ER intercoolers. I decided to follow the advice of a couple tweakers and played around with my MBC too. CFs and KVs made me brave so I added some timing too.

Elevation\Altitude is 6200 feet
Road is slightly uphill
MBC set to 22 spike with 20 taper
Run 1 +5% primary
Run 2 +5% primary +3 degrees timing
Run 3 +10% +3 degrees timing


<a href="http://www.coloradostandby.com/brad/ecux/stage3_er_ics/index.html" target="_blank">New logs here</a>

original post\logs <a href="https://forums.audiworld.com/s4/msgs/2776580.phtml" target="_blank">here</a>

what do you guys think? Any specific advice to help a lemmi noob is greatly appreciated.

DocSlowMiniPerson

With the AWE stage 3 software, your requested boost will drop as correction factors increase (just like stock software). If your requested boost drops a bit, your positive deviation in the mid-range (due to the MBC only spike) will be great enough that you'll eoncounter throttle cut very possibly. For this reason, I would be careful about adding timing. This requires some more long-term testing to see how things go, though.

If you don't have a wideband, I wouldn't tweak fuel too much. It's pretty tough to know where you're at in terms of air/fuel. As you can see there, the difference between 0% added, 5% added, and 10% added doesn't seem to be noticeable by the narrowband 02 sensors.

Enjoy and be safe!

heatsoakedS4

Every time I see Logs, it looks Like I should know what it all means relative to the +10 primary etc. etc. I gotta STFA logging at some point.

Nigel (no more S4)

Follow what Jordan says below closely though. We've found that if you see CF over 6 degrees, that software begins to pull requested boost.

DocSlowMiniPerson

But same would say I still do.

nyet

so you can see the PR compressor map overlay correctly.

put in 520cc for injector size, and 85-87mm maf if open element, 83-85mm if you have an airbox.

thats just a ballpark, there is no way to get it closer w/o a wideband for a reference.

ColoradoBrad

Thanks for the advice guys! I'll post more logs when I get time.

ColoradoBrad

TC is NOT obvious when running an MBC. At TC, the throttle plate is closed to X% but turbos still make boost. This seems bad. So with MBC it looks like I have 2 options to try and avoid TC.

1. I can get a TCD to clamp the MAP voltage so that the ECU nevers sees more than ~2.35 bar abs.

2. I can also just up the boost with the GIAC boost controller. Which is what you see in the logs above.

I like #2 because I can still log actual boost. I'm thinking I should turn the req boost up more to reduce pos deviation in the lower rpms. This errors on the side of more neg boost deviation at redline. But how much neg variation can there be before there are consequences?

Thoughts?

Thanks guys!

nyet

the problem is BC doesn't really help the midrange boost req

ColoradoBrad

So you think a TCD is a safer bet?