Question about 1984 Ford F 250

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RS4 performance chip in a 2008 Class A motorhome

Will the RS4 performance chip improve HP, torque and/or fuel economy on a 2008 Class A Coachman Mirada RV running the Triton V-10 in a 2007 Ford motor home Chassis? Specs on the engine are around 360 HP and +420 # torque. Currently averaging around 10 mpg with transmission in overdrive (out of towhaul) @ 62 - 64 mph and fueling with 87 octane. When I push the speed up to around 70 mileage drops to around 9 mpg on flat pull. Obviously highway grade makes a difference and I never operate in cruise control unless grade is relatively zero to 3%. Running Royal Purple synthetic lube in engine and the Dana 110 rear axle.

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  • Ford Master
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RS4 performance chip is just a $0.50 resistor that fools your IAT (Intake Air Temperature) sensor. All it will do is cause your engine to run leaner or richer depending on what the resistor rating is on the resistor. You can get the same result by disconnecting the wire leads to your IAT, the resistor only keeps your check engine light from coming on.
The higher resistor rating, the leaner the engine will run and the lower the resistance will cause your engine to run richer. But the program to your engine PCM has set perimeters which takes readings from your MAF, MAP, Engine Temperature, and O2 sensors to keep your engine running at 14.7:1 air fuel ratio, so the RS4 Performance chip only works during start up on a open loop with the engine still cold and under 400 RPM. It IAT is only there to determine the amount of fuel needed to start the engine during cold starts.
If you are interested in a true performance and economy for the amount of fuel used. Dyno tune your PCM for the best performance your F250 can provide.http://www.pcmforless.com/ is one of the best tuners out in the market that is worth investing.
Thank you for using fixya, and good luck

Posted on May 10, 2010

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Posted on Jan 02, 2017

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