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i just got a new STC chip and i was wondering if it would hurt the truck if i left it in performance mode when towing. Heaviest thing would probably be a bobcat or some cars. Thanks.
towing in performance mode?
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Do not attempt this without an EGT gage, you could ruin your engine.
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Your tune doesn't matter when towing, as long as you never exceed 1,250º pre-turbo exhaust gas temp (EGT). So as 69mach1377 cautioned, don't even think about tying onto a trailer with a hot-rod tune unless you have a pyrometer with the thermocouple (sender) mounted before the turbo (pre-turbo).
You will quickly discover that the performance tunes will reach 1,250º in heartbeat, and it is much more difficult to maintain 1,200º to 1,250º when towing up a grade. So a good towing tune is much better for towing. You still have to drive by the pyrometer (EGT gauge), but it's much easier to maintain 1,200º to 1,250º as you climb the pass with a heavy load.
Don't underestimate the weight of those "little" Bobcats. They're like hauling around a big chunk of lead, so their size is deceiving. If you climb a mountain pass or even a big hill with a Bobcat in tow, you can quickly melt an engine if you don't drive by the pre-turbo pyrometer.
You will quickly discover that the performance tunes will reach 1,250º in heartbeat, and it is much more difficult to maintain 1,200º to 1,250º when towing up a grade. So a good towing tune is much better for towing. You still have to drive by the pyrometer (EGT gauge), but it's much easier to maintain 1,200º to 1,250º as you climb the pass with a heavy load.
Don't underestimate the weight of those "little" Bobcats. They're like hauling around a big chunk of lead, so their size is deceiving. If you climb a mountain pass or even a big hill with a Bobcat in tow, you can quickly melt an engine if you don't drive by the pre-turbo pyrometer.
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thanks guys im gonna go throw in into tow mode right now.. i also have an AFe stage 2 intake and 4 inch downpipe into 5 inch straight pipe stacks. How much do you think that brings the EGTs down. AND with the chip one of the options in Locked at CT. DO you know what this means. its a ford f350
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Poorly-worded question.
As long as your EGT is less than 1,250º pre-turbo, then you don't need to "lower" EGT. You can run all day at between 1,200º and 1,250º EGT without hurting a thing except your fuel bill. What you want is more speed, or a heavier load, or a steeper grade without the EGT exceeding 1,250º.
So with your stock intake and exhaust, if you can drag your loaded trailer up a certain pass at 55 MPH without exceeding 1,250º EGT, then the improved intake and exhaust should give you about 5 to 10 MPH more speed up the same grade with the same load without exceeding 1,250º EGT.
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The only way to know would be a before and after with a gage, but those 2 mods are supposed to help for sure.
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Also - EGTs can go higher with tunes if things are not in top notch condition - so just because one truck is safe to drive in a certain tuning mode, another truck may exceed the max recommended temps.
As far as the "Locked at CT" - I think that is locked at TC - and will lock the torque converter - or an option to set when it locks.
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Just installed the EGT gauge before going to PA to pickup an engine 1100 miles RT. Being as I had just installed the EGT gauge I kept a close eye on it under varying conditions. Running 70 MPH in PA over the hill's the EGT hit 850* unloaded uphill, normal EGT's was 725*. On the way back loaded with the engine (900 lbs) the EGT's quickly climed to 1150* at 70 MPH. Everything is stock on the truck in my profile. So pulling a load like grgzlotnick768 is going to pull, I would think that 1250* would come up real quick even at 55 MPH. on the slightest hill's or tromping down to pass.
70 MPH uphill 4% grade boost @ 8 PSI EGT 850* unloaded.
70 MPH uphill 4% grade boost @ 12 PSI EGT 1150* loaded (900 lbs)
70 MPH flat boost @ 4 PSI EGT 725* unloaded.
70 MPH uphill 4% grade boost @ 8 PSI EGT 850* unloaded.
70 MPH uphill 4% grade boost @ 12 PSI EGT 1150* loaded (900 lbs)
70 MPH flat boost @ 4 PSI EGT 725* unloaded.
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thanks that helps a lot... im getting guages intalled prettty soon
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Depending on your truck profile (single rear wheel vs. dually, 2wd vs 4wd cab height), headwind vs. tailwind vs. no wind can also make a difference in EGT at 70mph. As stressed above - you need pre-turbo EGT gauge if you're anything other than stock.
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Guess I should have said where I located my pyrometer, drilled a 1/4" hole between the #6-8 cyl's in exhaust manifold, pryrometer is held in by a stainless hose clamp with a hole in it and a ceramic washer to seal it. That is pre-turbo EGT's.
Head winds 20-25 MPH will make the EGT's vary by about 50*-60*. All of the above will also vary the EGT's.
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