Sct SRL
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 14
From: Virginia Beach VA
The Atlas 40 doesn't matter, they just need the PCM strategy. It will fuel to whatever they program the PCM and then add the Atlas 40 on top of that. Won't hurt anything. But I would say, if you run a hot tune, better be studded.
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,258
Likes: 771
From: Houston, Texas
I would say so, because Matt generally never recommends going over the Atlas 40 with SRL, SRL+, or SRLX. (SRLX is a full fuel tune comparable to TSD's SPD) Depending on the PCM strategy, things tend to get smoky and too hot, too fast. The VXCF4 family of strategies is a prime example of this. This family of strategies has aggressive fueling that made stock trucks powerful and yield great fuel economy when paired with the FICM calibration AMZ2AL12. (I've seen this with VXCF4X3 and VXCF4HB)
The VXCF9 family of strategies tends to be a little leaner, so it benefits more from the Atlas 40 than the earlier strategies.
The VXCF9 family of strategies tends to be a little leaner, so it benefits more from the Atlas 40 than the earlier strategies.
More Turbo
Joined: Mar 2016
Posts: 644
Likes: 10
Well it seems I was misinformed about the Bully Dog. Just got an email back from Gearhead and they say they can't tune the Bully Dog. Multiple sources said it was the same software as other SCT devices and the custom tunes worked. I guess it's Innovative now for tunes.
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Elder User
Joined: Jan 2004
Posts: 900
Likes: 0
From: Arizona
Well it seems I was misinformed about the Bully Dog. Just got an email back from Gearhead and they say they can't tune the Bully Dog. Multiple sources said it was the same software as other SCT devices and the custom tunes worked. I guess it's Innovative now for tunes.
More Turbo
Joined: Mar 2016
Posts: 644
Likes: 10
Yes, the Innovative tunes tune the trans through the Bully Dog. Bully Dog press releases even say it uses SCT custom tuning software but apparently there is something different because Gearhead said they can't tune through it.
Senior User
Joined: Apr 2016
Posts: 103
Likes: 1
I've been reading some unsettling reports on a couple of other powerstroke forums regarding stacking the Atlas40 and the SRL. Curious if others have had issues on FTE.
I'm currently waiting on a revision from Gearhead but my issues had to do with the shift points but haven't had the tune long enough with shifting that I like to have an idea of the driveability or if there is a conflict between the PHP Ficm tune and the SRL pcm tune.
I'm currently waiting on a revision from Gearhead but my issues had to do with the shift points but haven't had the tune long enough with shifting that I like to have an idea of the driveability or if there is a conflict between the PHP Ficm tune and the SRL pcm tune.
Senior User
Joined: Apr 2016
Posts: 103
Likes: 1
Drivability. I'm not sure exactly what that means but the implication was that stacking the tunes did not always meet with good results.
From PHP...
Because many tuners spoof the ICP reading to artificially raise the pulsewidth in the FICM, some ECM tunes may see some incompatibility or drivability issues when running our FICM tunes. This is because the FICM generates a pulsewidth value based on the ICP pressure received from the ECM. If the ICP value is already artificially low and then is run through a FICM tune where the pulsewidth tables are modified, unpredictable results can occur.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 14
From: Virginia Beach VA
I'm not having any issues, love the way it shifts, no wait on turbo spool times, little smoke except on hard throttle and I routinely see 15 mpg in town and 20+ highway.
My EGTs are a little higher than stock but not overly high and rarely see anything higher than 1100. Highway EGTS are mid 650-700 at 70mph sustained and I run 35% IPR with 10# boost, rarely come out of a locked torque converter to pass.
Trucks got a 2" level kit up front, 35x12.5x20 mud tires, 4" exhaust sounds like a jet engine and drives like a sports car!
Almost every tuner modifies the pulse width to get a longer burn, it increases EGTS without increasing cylinder pressures. Why you can run some tunes without studs.
If your close to Virginia Beach. Come by and I'll take you for a ride and you can see for yourself what a stacked tune will do.... made specifically for your truck.
My EGTs are a little higher than stock but not overly high and rarely see anything higher than 1100. Highway EGTS are mid 650-700 at 70mph sustained and I run 35% IPR with 10# boost, rarely come out of a locked torque converter to pass.
Trucks got a 2" level kit up front, 35x12.5x20 mud tires, 4" exhaust sounds like a jet engine and drives like a sports car!
Almost every tuner modifies the pulse width to get a longer burn, it increases EGTS without increasing cylinder pressures. Why you can run some tunes without studs.
If your close to Virginia Beach. Come by and I'll take you for a ride and you can see for yourself what a stacked tune will do.... made specifically for your truck.
Senior User
Joined: Apr 2016
Posts: 103
Likes: 1
Cool, I'm a long way from VA beach but will take your word for it.
I have the Xstreet from IDP which I generally like but the power comes on quick (lightbulb effect) and it's a bit smokey. Atlas40 on my rig just seems to increase the heat but it's hard to tell when it's stacked with a PCM tune. One reason I wanted to try the SLR, hoping the power is a bit more linear. But still waiting on a revision for the wonky shifting.
I have the Xstreet from IDP which I generally like but the power comes on quick (lightbulb effect) and it's a bit smokey. Atlas40 on my rig just seems to increase the heat but it's hard to tell when it's stacked with a PCM tune. One reason I wanted to try the SLR, hoping the power is a bit more linear. But still waiting on a revision for the wonky shifting.