LVSBB6

iTrader: (4)

I know many of you are debating whether to use an aftermarket intake with your Cobb AP stage 1 reflash. I cannot speak for other brands, but if you are running Gruppe M or Coltspeed ram air intake, then you are in luck!

So today I took my MR to the dyno and see how the stage 1 Cobb reflash would work on my Evo X. The peak numbers are very low on this particular mustang dyno, about 15% to 20% less compared to Dynojet or Dynodynamics. The tech told me stock Evo X makes 180whp to 190whp while new STi makes 200whp to 210whp on this roller.

94 octane is used for all the runs with Gruppe M intake

Baseline, no tune: 200whp/210wtq
2nd run: Cobb stage 1 (91 octane map) 235whp/226wtq (+45whp & +35wtq gain at 7100rpm)
3rd run: Cobb stage 1 (93 octane map) 245whp/233wtq (+55whp & +45wtq gain at 7100rpm)



Boost & A/F ratio graph for all 3 runs:
A/F for baseline spikes to 10.7 falling to 10.4 at redline.
A/F for 91 octane map spikes to 11.4 falling to 10.7 at redline.
A/F for 93 octane map spikes to 12.4 falling to 10.7 at redline.



Overall I'm happy with the results, this is a very conservative tune that Cobb has provided and it works well with my mods. There are definitely a lot of rooms to be fine tuned, as the base maps always come overly safe.

tomatoEVO

iTrader: (9)

weird, my tuner was talking about how a stock X makes around 213-215whp stock. the 180 mark seems kind of low for a vehicle making 291 at the crank.

smoothevo

iTrader: (3)

Think you may have missed this?

GSXR

iTrader: (3)

Wow, you have a really weird dip in your midrange. You should see about getting a custom tune on yours. I'm betting your aftermarket parts are not working well with the tune.

LVSBB6

iTrader: (4)

Yes there's still a lot of room to be tuned, the dip is mostly associated with the intercooler, my AFR is still pig rich with this map.

davidiii

iTrader: (5)

do you still have stock exhaust, stock cat etc? id imagine your afr would be slightly higher if you replaced the cat with a testpipe etc etc..

GST Motorsports

iTrader: (8)

The dip in the power curve is most likely because of the same dip in the boost curve that you can see in the second chart he posted up. I've seen this on a couple X's still using the factory pill. Some don't have the dip, some do. A couple have been contributed by boost leaks as well.

Noize

iTrader: (24)

To me, that dip is extreme and I would not want to drive around like that. I'd definitely go with a custom tune from your Cobb tuner to get the boost and other bugs hammered out.

gunzo

iTrader: (2)

Nah .. its from poor adjustment of the boost control

ice1874193

I don't think "you are in luck" with that tune....

LVSBB6

iTrader: (4)

yes, turbo back is still stock. only the intake and intercooler are changed.

GST Motorsports

iTrader: (8)

In the cases I have seen it was not from poor boost control tuning at all. Still did it with error correction off, etc.

Here is an example, even happens around the same RPM as the OP:

gunzo

iTrader: (2)

Then its the exhaust .. because I used to have this issue also

Once you set the spool too fast with the stock exhaust .. this is what you get .. even removing the CAT will change that ..

And if you've noticed .. the stock timing right at 6000rpms is much lower than its surrounding ..

LVSBB6

iTrader: (4)

^The stock exhaust is choking in the midrange big time, expecially with my intake and intercooler already in place.

I will be putting in test pipe and exhaust soon, still debating which O2 downpipe to get.

A full tune will be done once the parts are on

gunzo

iTrader: (2)

be careful of your GruppeM filter

Maintenance is ALOT more frequent than normal filters .. miine is totally choked at 2000mi ..probably because it's taking much more direct outside air than standard filters ..

Bryan, just have a check on most of the dynos with stock exhaust .. so far that's what I noticed if the boost control is not setup properly ..