203 stat and 235/85 tires - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 4 (permalink) Old 10-11-2007, 01:52 PM Thread Starter
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203 stat and 235/85 tires

I currently have the 203 stat for a few years and I thought that it did help with economy, but I have had my doubts over the years. What have you guys discovered about this mod? Also, I am getting close to the end of my stock tires. Does it help to go to the narrower 235s? Thanks

2002 f-350 PSD, 4x4, cc short bed, 6spd, ccv mod, airdog, AIS filter, isspro ev and scangauges, detroit TT, ITP boost annihalator, ITP RR, bellowed up-pipes, ats housing, turbomaster, 3.5 dp magnaflow, very happy with ultra smooth and linear PHP 50t, 80DD and "whisper" tunes.
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post #2 of 4 (permalink) Old 10-12-2007, 12:30 AM
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Re: 203 stat and 235/85 tires

I put the 203 degree stat on my truck and documented an 0.5 MPG improvement.

I really think these engines are pretty optimized but put inot wildly overgeared drive trains. I don't think there is much fuel economy improvements to be had from tinkering with the engine. Even with a specail MPG chip, I got only a 0.75 MPG improvement.

As for tires...in theory the 235-85s should give better MPG than the 265-75s but I've had both and can't document any difference. be sure to get E rated tires and air them up to 80 psi.

I may be doing new tires in the spring and I think I'm gonna try some rib-pattern tires like the Michelin XPS Rib.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
Rugged Air Dam
315,000 miles
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post #3 of 4 (permalink) Old 10-12-2007, 12:59 AM
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Re: 203 stat and 235/85 tires

yea i agree i dont see a whole lot of MPG gain I run 285-75-16 and i dont notice a drop from the 245-65 i was running. with your 4wd id stick with the larger tire. It kinda defeats the purpose of having the 4wd and wont look as good on your truck.

Jeff
HIS: EARLY '99 F250 SD 4x4 Off Road, 7.3L PSD 6 SPD SuperCab Short Bed
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HPx Line-DIY Tymar-Fuel System(on Return)

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post #4 of 4 (permalink) Old 10-12-2007, 11:47 PM
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Re: 203 stat and 235/85 tires

Going from 245s to 285s would in fact decrease your fuel mileage.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
Rugged Air Dam
315,000 miles
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