Changing custom tunes - Ford Powerstroke Diesel Forum
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post #1 of 20 Old 07-18-2012, 01:58 PM Thread Starter
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Changing custom tunes

So I have SRL, 8k tow and I haven't used the tow tune yet. I am going to pull my boat this weekend only about 30 miles. I have heard that when changing tunes there is a slight relearn curve, and also that you shouldn't tow with SRL. I wanted to check to see if this was true and what is the proper way to change to the tow tune and pull my boat and then switch back. Basically, I want to DD the SRL and occasionally pull my boat. What are you guys thoughts on this? Thanks

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post #2 of 20 Old 07-18-2012, 03:44 PM
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Load your tow tune, drive unloaded for ~30 miles to allow it to learn to shift again then you should be good to tow.

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post #3 of 20 Old 07-18-2012, 04:41 PM
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How heavy is your boat? I have srl tune and I tow my boat (2400lbs w/trailer) and dont have any problems. Just should take it kinda easy and if possible watch your temps.

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post #4 of 20 Old 07-18-2012, 05:20 PM
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I tow my small 18ft center consle on the IDP X Street tune and it seems ok. But I only go about 5 miles and never over 60mph and I stay light on acceleration

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post #5 of 20 Old 07-18-2012, 05:46 PM Thread Starter
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My small boat is a 16ft cc and its aluminum so very lightweight so it would probably be alright if I babied it, but I just dont want it to cause any problems later down the road. Guess I could try it once and watch temps to look for how much difference.

psd_va, what kind of mileage are you seeing with SRL? Also, I see your outta newport news. I'm from yorktown but live in southern maryland now and come back to va most weekends. Maybe we can meet up sometime.

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post #6 of 20 Old 07-18-2012, 06:05 PM
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I just towed 10K with the SRL and stock head bolts. Just take it easy and watch the temps.

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post #7 of 20 Old 07-18-2012, 06:42 PM
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Quote:
Originally Posted by Joeshu1000 View Post
I just towed 10K with the SRL and stock head bolts. Just take it easy and watch the temps.
You'll pay for that mistake. The reason they say not to tow with race tunes is because of the extreme cylinder pressures that they create. A tow tune changes the torque curve to lower rpms to and don't advance the fueling and timing to keep the cylinder pressures to a minimum while maximizing torque. Mark my words if you keep towing 10,000 with a race tune you will stretch your stock head bolts.

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post #8 of 20 Old 07-18-2012, 06:51 PM
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Quote:
Originally Posted by Tuscany View Post
You'll pay for that mistake. The reason they say not to tow with race tunes is because of the extreme cylinder pressures that they create. A tow tune changes the torque curve to lower rpms to and don't advance the fueling and timing to keep the cylinder pressures to a minimum while maximizing torque. Mark my words if you keep towing 10,000 with a race tune you will stretch your stock head bolts.
my boat is probably around 2000 lbs or less....would you switch tunes? Currently on idp extreme street. If I tow anything heavy I would def switch over, but the boat last minute sometimes and I could be at ramp before the tune is swapped

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post #9 of 20 Old 07-18-2012, 07:09 PM
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I don't think that little bit of weight would hurt it if you aren't driving it like you stole it. No quick accels and what not. The other guy says he tows 10,000 with a race tune and if he keeps it up he could very possibly be buying a new engine and not just blow the head gaskets.

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post #10 of 20 Old 07-19-2012, 03:48 AM
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10-4 on that. Yes, def not going over half throttle when towing the boat, especially knowing what yoy mentioned above on how the race tune is set up...
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