2014 - Present Challenger MT Series Tractor Reflash
From $1,850.00
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$1,850.00
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$1,850.00
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2014–Present Challenger MT Series DEF Delete Reflash
Built for the E-series and later Challenger MT tractors, from the compact-frame MT400E to the articulated MT900E. The Reflash Master handheld connects at the cab and loads a calibration that turns off urea dosing and stops SCR faults from cutting power. Add Stage 1 or Stage 2 to put more horsepower behind the hitch and PTO. We ship all across the US and Canada.
FitsMT400E–MT900E, 2014–present
SystemsDEF / SCR
EngineAGCO Power 4.9L–16.8L
MethodReflash Master handheld
TurnaroundTuned file in 2 hours
PowerStage 1 or Stage 2
Horsepower tunes · Challenger MT685E
Stock280HP
Factory rating
Stage 1308HP
+28 hp · +10%
Stage 2336HP
+56 hp · +20%
Figures are for a 280 hp MT685E. Every other model on this page gains about the same percentage over its factory rating, so ask us for the exact numbers on yours.
Kit includes
01Reflash Master handheld device
02USB cable and diagnostic cable
03Quick Reference Guide
04Reflash Master Client software
EXHAUST
No straight pipe needed
These Challengers reach Tier 4 Final through SCR only. With no particulate filter and no EGR system on the engine, nothing needs to come off the exhaust, and leaving the catalyst in place costs almost nothing in flow.
Handheld tuning process
STEP 01OrderPlace your order and the handheld is normally packed and shipped by the next business day.
STEP 02ReadConnect at the diagnostic port in the cab and copy the original ECM file onto the device.
STEP 03SendSend the stock file to us from your computer. Expect the modified file back in roughly 2 hours.
STEP 04WriteLoad the new file onto the tractor, turn the key off and on, and get back to work.
Challenger tractors it fits
Every E-series family plus the later MT700 tracks, model year 2014 and newer.
Challenger · Tier 4FMT400E SeriesMT455E · MT465E · MT475E · MT485E · MT495E
Challenger · Tier 4FMT500E SeriesMT515E · MT525E · MT535E · MT545E · MT555E · MT565E · MT575E · MT585E · MT595E
Challenger · Tier 4FMT600E SeriesMT645E · MT655E · MT665E · MT675E · MT685E
Challenger · Tier 4FMT700E SeriesMT755E · MT765E · MT775E
Challenger · Tier 4FLater MT700MT738 · MT740 · MT743
Challenger · Tier 4FMT800E SeriesMT845E · MT855E · MT865E · MT875E
Challenger · Tier 4FMT900E SeriesMT955E · MT965E · MT975E
Not sure which series you have? Email us a picture of the ID plate and we will check compatibility first.
Why delete DEF and SCR on a Challenger MT?
DEF
Diesel exhaust fluid
On a high-horsepower track or articulated tractor, urea is a line item that grows with every acre, and topping it off pulls the operator out of the seat. Left over winter it degrades, crystallizes in the pump and supply lines, and freezes easily in cold weather. Once the delete is loaded, drain the tank and flush the lines with washer fluid so no residue hardens inside.
SCR
Selective catalytic reduction
Tier 4 Final aftertreatment on these machines is aging, and dosing valves, heaters and supply modules are frequent failures. A single fault can drop the engine into reduced torque right when the planter or deep ripper needs it most. The new calibration ignores the SCR hardware completely, so engine output no longer depends on its condition.
NOx
NOx sensors
The upstream and downstream NOx sensors are pricey parts that are often back-ordered during the busy season. With their readings removed from the software, a failing sensor stops being a reason for a warning light, a power cut or a dealer visit.
Extra pull for E-series Challengers
AGCO sets conservative fuel and boost limits from the factory. Stage 2 takes an MT685E from 280 hp to around 336 hp without touching the hardware.
01280 to 336 hpRun a bigger drill or tillage tool without stepping up a frame size.
02Steadier engine speedLess lugging when the soil gets heavy or the field turns uphill.
03Reserve when you need itLighter jobs take less effort, and the extra power waits for the toughest acres.
Frequently asked questions
Q1Why choose Reimer Tuning for a Challenger MT tractor?+
Every Challenger file is built in-house by our own tuners, not outsourced. Turnaround is usually about 2 hours, files include a 1 year software warranty, and our techs will stay on the phone with you during the install if needed.
Q2Does it cover every E-series model?+
Yes. From the MT400E row crop up to the MT900E articulated tractors, including the later MT738, MT740 and MT743, each file is written for the stock read we receive. Include your serial number at checkout so we can confirm the fit before shipping.
Q3Can I order a horsepower tune without the DEF delete?+
Yes. Either stage can be combined with the delete or run alone with the factory SCR left active. Just note which option you want when you upload your original file.
Q4What is the difference between Stage 1 and Stage 2?+
Stage 1 gives roughly 10% more power and is a good match for steady, all-day loads. Stage 2 gives roughly 20% for heavy drawbar work where you want everything the engine can deliver. Factory temperature protections stay active with either one.
Q5Do I need to remove any exhaust parts?+
No. There is no DPF on these engines, and the SCR can remain installed. The change is made entirely in software with no exhaust modifications required.
Q6Can I tune a second tractor with the same handheld?+
Yes. The handheld is yours to keep, and extra licenses are available for additional Challenger, Massey Ferguson or other compatible equipment.
Q7How fast does the kit ship?+
Most orders leave within 1 business day for customers in the US and Canada. Expedited orders received after 12 ET go out the next day.
Q8Disclaimer+
For off-road farm equipment only. Not intended for any machine registered for road use. Confirm local state or provincial regulations before purchase.
Why Reimer Tuning
Our Canadian shop has tuned farm machinery since 2014. Challenger files carry a 1 year software warranty, and the person who answers the phone knows AGCO tractors inside and out.
Off-road use only. Not for machines registered for highway use. Buyers are responsible for knowing their provincial or state legislation. All sales final.
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2014 - Present Challenger MT Series Tractor Reflash
$1,850.00
