SCT tuning - performance and extreme - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 24 Old 09-16-2009, 06:49 AM Thread Starter
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SCT tuning - performance and extreme

I tested both the performance tune and extreme tunes using the race transmission settings. I noticed that EGT's and boost were much lower running the extreme tune at both 65 and 70 mph. I have to believe this is good and should mean better mpg's. Is this assumption correct? What are the downsides of running the extreme tune?

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2008 F250 Super Duty 4X4
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Nitto 37" Terra Graplers
4" dpf/cat delete w/MBRP
SCT Tuner - Performance Tune
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post #2 of 24 Old 09-16-2009, 10:08 AM
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The Extreme Tune is were everybody have been seeing the best Fuel Economy when they are keeping the vehicle around 2000 RPMs. I have not seen any problems running on the extreme tune.
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post #3 of 24 Old 09-16-2009, 10:16 AM Thread Starter
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Thanks. I'll keep running the Extreme Tune. Will the cat hurt fuel economy?

2015 F250 Lariat SD FX4
6" Rough Country Lift
20" XD Series Wheels
37" Nitto Trail Grapler M/T
Stock

2008 F250 Super Duty 4X4
6" Pro Comp Lift
Pro Comp 6001 Wheels
Nitto 37" Terra Graplers
4" dpf/cat delete w/MBRP
SCT Tuner - Performance Tune
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post #4 of 24 Old 09-16-2009, 10:27 AM
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On our 6.4 we just installed the DPF delete and we didn't run into any problems with the Cat.
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post #5 of 24 Old 09-16-2009, 10:31 AM Thread Starter
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Thanks. I'll leave the cat on for now.

2015 F250 Lariat SD FX4
6" Rough Country Lift
20" XD Series Wheels
37" Nitto Trail Grapler M/T
Stock

2008 F250 Super Duty 4X4
6" Pro Comp Lift
Pro Comp 6001 Wheels
Nitto 37" Terra Graplers
4" dpf/cat delete w/MBRP
SCT Tuner - Performance Tune
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post #6 of 24 Old 09-16-2009, 11:20 AM
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No Problem
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post #7 of 24 Old 09-16-2009, 11:24 AM
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you will see better fuel mileage with removing the cat too, its a big source of restriction.

Adam Brannan

First Coast Diesel Performance

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post #8 of 24 Old 09-16-2009, 01:39 PM
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im running my truck on extreme with the cat/dpf delete pipe installed, so far im satisfied, i hope to get an RCD tune pretty soon, ive had my tranny slip once though..and sometimes it kind of jumps from first to second gear
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post #9 of 24 Old 09-16-2009, 01:42 PM Thread Starter
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What's the RCD tune? Who provides the tune? What are the benefits?

2015 F250 Lariat SD FX4
6" Rough Country Lift
20" XD Series Wheels
37" Nitto Trail Grapler M/T
Stock

2008 F250 Super Duty 4X4
6" Pro Comp Lift
Pro Comp 6001 Wheels
Nitto 37" Terra Graplers
4" dpf/cat delete w/MBRP
SCT Tuner - Performance Tune
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post #10 of 24 Old 09-16-2009, 04:20 PM
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Quote:
Originally Posted by bsudkamp View Post
What's the RCD tune? Who provides the tune? What are the benefits?
RCD = River City Diesel, there on here and you can go to there website rivercitydiesel.com. The benefits are better mpg and oh sht I think I just craped my self speed. The 585 is crazy fast but I highly recomend trans upgrades as its pushing very very close to 600 rwhp and will over power a stock trans over time. The 485 is one sweet @$$ street tune that will dust most every thing on 4 wheels on the street.

2008 F-250 FX4

Procomp 6" lift, MX6 Shocks
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20" Black XD Hoss
SCT Livewire W/RCD 485 & 585
4" Flo-Pro Down Pipe
5" Flo-Pro Turbo back Exhaust
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