I've been tuning my completely stock 08GSR with my Cobb AP and managed to boost to 23 psi. Now this weekend I throw on an Injen CAI with UICP, load up the Cobb AP off the shelf Stage 1 + Injen and my boost is peaking around 20.3. So I add some WGDC, still peaking in the mid 20's (20.9 max.) Now my WGDC tables are way more agressive than they used to be with the stock intake and I'm not even breaking 21 psi. I check for boost leaks, found nothing. Anyone have any suggestions? Is the Injen piping so much bigger than stock that I can't break 21 psi? Doesn't seem likely....

I can supply logs if someone thinks they'll be helpful.

 

Are you running the Injen Maps?

 

Ya the Injen map at first, but I was only pushing ~19-20 psi. SO I kept most of the map and just played around with the WGDC tables but I can't seem to boost past 21. This worries me a little since Cobb's website says I should be getting close to 24 without editing the WGDC tables.

I'm assuming others with an Injen intake are able to boost over 21...

 

I may be able to tell you what's going on here.

From what I've seen the Cobb maps for aftermarket intakes are scaled pretty high. This means load will increase. So lets say prior to the intake install your boost was 23psi and your load was 260. After the intake and Cobb map, when you boost 20psi, it may show 260 load. Since wgdc is based on load (not psi) boost correction may be kicking in earlier than it's suppose to be. Check your logs for your current load and make sure it isn't going too high. Also, if possible, log your boost correction to see if your boost correction is kicking in too early.

If nothing is changing even if you change your wgdc, this may be because you are already using the maximum wgdc. If this is the case, you'll need to raise your boost offset and you should see your boost climb.

 

If that is your issue, then you will need to turn off boost correction, tune your WGDC for the boost you want, then set your target load (via target load + offset) to the load you were hitting at the boost you wanted. Then turn boost correction back on.

It sounds a bit complicated, but it is fairly simple and will make your life easier in the end.

 

Thanks for the suggestion guys. I have a log that shows my maximum load, at peak boost, is a little under 230. The boost tables request in the 280s at this point, so if anything the wgdc correction would be adding to the values in the table.

So basically, my target boost is not being reached, the WGDC is correcting for it, and my boost is still down around 21...sounds like a boost leak to me but I've checked all the connections I touched during install 3 times now. I suspect the BOV but is that even viable?? I mean I didn't even disconnect it from the pressure side, I don't see how I could've damaged it...

I attached data log with 2 pulls. I only pulled to around 4000 since peak boost usually occurs around 3300 and I live in the city so it's hard to redline it. You'll note my WGDCs are pretty high compared to the OTS Stage 1 + Injen map with little to no result...

Of course any input is appreciated.