there was a service bulletin released so if you have the oil changed at the dealer they will put non synthetic in . why who knows.

 

Up until this week, weather has been pretty mild. 60-70 deg

 

so the 2012 is down in power?

 

I refer back to something that happened early on in the 4G63s.

Cams all have the same part number but 2004s were down in power compared to 2003s (on stock cams), the 2005s have been shown to have cams indexed wrong and require 7* more timing to make the same power. This goes away as soon as the cams are swapped. I have done 6 2012s since this thread was first posted and 5 of the 6 are down 15-30whp with no changes in the tune or parts being used. Corrected to corrected, uncorrected to uncorrected, 5 of them made less.

The exact reason will probably be eventually figured out but for the time being I wouldnt worry about it. More boost, meth injection, different cams, all the same stuff we all normally do and go. The gap definitely shrinks the more mods that get done, that is a definite.

 

Just wanted to share this, I had a 08 xmr. TBE and intake. car made 307 (wheel)on mustang dyno.
3 years later, bought a 11 xmr, installed same TBE and intake, added 4' FMIC and piping. 293 (wheel) on dyno jet. Was around the same time of year.
Same tuner. I was crushed. Sounds like a similar problem.

 

that is exactly what im worried about... mod and tune then get dissapointing results

 

meh i wouldn't worry. just the change in power band or at least the feeling of it will be worth the $300-500 for a tune

 

well i'll be getting tuned next friday, my tuner said he's had one other 2012 and it put down 270 bone stock gsr, with 08-11 GSR's usually putting down 230-250, probably an outlier. either way i'll let you guys know, usual numbers for a stage 2 should be around 340-350 whp and 330-340 wtq on this particular dynojet. so we'll see, i'm really hoping to be 350/350 but it's gonna be around 95 degrees on the day i'm getting tuned.

 

They always pickup over stock. That percentage seems to be constant. Something is still better than nothing.

 

Tell him you want the numbers both corrected and uncorrected. Corrected means nothing, its 86* here for reference and 40% humidity so our air quality might actually be worse than VA right now.

 

Will do. And I'll post the charts as well. Are all the 12's you've tuned that are down on power also all MR's?

 

GSRs and MR's but the MR's comprise the bulk of the 2012s I have done in the last 2 months.

 

it's better than nothing, but knowing you're not getting the numbers you should will drive me nuts! LOL

 

just thought i'd post up some dyno #'s on my 2012. weather wasn't too hot but it was drizzling a bit and had about 85% humidity, temps were mid 80's. Power wasn't down compared to other years according to Chris the tuner, in fact if anything seemed a bit stronger.
Numbers shown are corrected. uncorrected numbers were 342 whp/ 350wtq. car is night and day.

Mod List:
Pierburg 3 port
ETS Intake
ETS 4" FMIC
ETS UICP
ETS LICP
ETS HFC
ETS V2 Quiet Catback
AMS Downpipe
Synapse DV with Mil.Spec spring

 

Strange, I had only heard about the 08s being slightly down on power.