Looking for help with SCT X4 canned towing tune consistently lean, '99 F350 V10
#1
10-22-2017, 04:17 PM
Join Date: Aug 2001
Location: Queen Creek, AZ
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Looking for help with SCT X4 canned towing tune consistently lean, '99 F350 V10
I think I'm at the end of what the tuner is capable of without getting a custom tune made, wanted to see if anyone else has any advice before pulling the trigger on some dyno time which is a PITA with a dually...
Truck is a 75k mile '99 F350, V10 auto 4x4 dually w/ 4.30 gears. It tows the horse trailer, the car hauler, and carries bales of hay and bags of feed, so it is constantly under load.
Modifications, BBK dual 65mm TB, custom 3.5" single exhaust w/ Magnaflow XL 3 chamber muffler with turn down, homegrown ram air that draws from behind the grille w/ K&N drop-in filter, Iridium XP plugs, SCT X4 (updated to latest) canned 91 octane towing tune. Going to make things worse shortly with a nice clean Y-pipe instead of the wonky loopdy-doo Ford put on there.
Truck pulls AMAZING with this setup compared to stock! Part throttle and easy to moderate acceleration is like the horse trailer isn't back there, and I've only had to go WOT once with a trailer on a very short highway on-ramp and the little non-PI V10 launched the truck and loaded car hauler up to 65 before hitting the merge.
Problem: Short term fuel trim is consistently 0.98x-0.99x, long term is 1.05x-1.1xx, not terrible but not ideal for a tow rig that I'd rather not run lean.
I've messed around with the fuel settings a little but am a little gun shy since I'm not real well versed with it and I don't want to hurt the truck any. Thinking of dropping the tune octane setting down to 89? I run 91 in it, the best we have here in AZ.
Thoughts are appreciated!
Truck is a 75k mile '99 F350, V10 auto 4x4 dually w/ 4.30 gears. It tows the horse trailer, the car hauler, and carries bales of hay and bags of feed, so it is constantly under load.
Modifications, BBK dual 65mm TB, custom 3.5" single exhaust w/ Magnaflow XL 3 chamber muffler with turn down, homegrown ram air that draws from behind the grille w/ K&N drop-in filter, Iridium XP plugs, SCT X4 (updated to latest) canned 91 octane towing tune. Going to make things worse shortly with a nice clean Y-pipe instead of the wonky loopdy-doo Ford put on there.
Truck pulls AMAZING with this setup compared to stock! Part throttle and easy to moderate acceleration is like the horse trailer isn't back there, and I've only had to go WOT once with a trailer on a very short highway on-ramp and the little non-PI V10 launched the truck and loaded car hauler up to 65 before hitting the merge.
Problem: Short term fuel trim is consistently 0.98x-0.99x, long term is 1.05x-1.1xx, not terrible but not ideal for a tow rig that I'd rather not run lean.
I've messed around with the fuel settings a little but am a little gun shy since I'm not real well versed with it and I don't want to hurt the truck any. Thinking of dropping the tune octane setting down to 89? I run 91 in it, the best we have here in AZ.
Thoughts are appreciated!
#2
11-24-2017, 07:00 PM
I don't have a v10, however, on my 7.3 custom tunes vs canned tunes is a night and day difference. With the canned tunes, shifting and the shift points were lousy, power delivery was horrible (torque converter never locked until I got into overdrive) crappy idle. With the new custom tunes I just got, power and power delivery is waaay better. Shifting and the shift points are spot on. The idle is rock steady.
Basically, I'd go for custom tunes if I was you. The v10 with 4.30s is already a beast, I'd imagine custom tunes would awaken the beast even more
Basically, I'd go for custom tunes if I was you. The v10 with 4.30s is already a beast, I'd imagine custom tunes would awaken the beast even more
#3
11-27-2017, 04:26 PM
Join Date: Mar 2005
Location: Marlboro Mental Hospital.
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talk to Mike at 5 star.
he should be able to help you with your issues.
he straightened my 2014 6.2 out.
http://5startuning.com
he should be able to help you with your issues.
he straightened my 2014 6.2 out.
http://5startuning.com
#4
12-21-2017, 01:10 PM
talk to Mike at 5 star.
he should be able to help you with your issues.
he straightened my 2014 6.2 out.
Custom Dynomometer Chassis Tuning Products and Services - 5 Star Tuning
he should be able to help you with your issues.
he straightened my 2014 6.2 out.
Custom Dynomometer Chassis Tuning Products and Services - 5 Star Tuning
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