Tow Haul??
Tow Haul?? I have a 2003 silverado 5.3.... I dynoed the other day and the guy said put your tow haul on.... does this effect anything or should i have not put it on??????
I think you all konw this all ready but its a Automatic....
I think you all konw this all ready but its a Automatic....
17,16,15,14,13,12,11 Drvr
iTrader: (10)
Joined: Aug 2003
Posts: 6,704
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From: Mont Belvieu, Texas
well when i dynoed my 4.8 along time ago i did a comparison and with it on it dynoed 10 hp less and tq was down as well just cant remember how much. dynoed with it first and without it last.
the only thing the tow haul on the trucks do is change the transmission gearing so the final drive is a 4.10 rather then the 3.83 or whatever it is. just helps for towing. i would imagine that it would dyno less with the 4.10 ratio in the trans. this is just from what i understand. not sure how true it is
Teching In
Joined: Sep 2002
Posts: 46
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From: Cheraw South Carolina
The tow haul setting on the truck does not change the gearing in the trans. What this button does is just change the shift point of the trans. You can see this in an editing program. It is under the performance setting. When tow haul is engaged it makes the trans shift later so it is easier to tow a trailer. It is easier to tow a trailer b/c the motor is higher in the rpm.
Chase
Chase
Originally Posted by Chase71Z28
The tow haul setting on the truck does not change the gearing in the trans. What this button does is just change the shift point of the trans. You can see this in an editing program. It is under the performance setting. When tow haul is engaged it makes the trans shift later so it is easier to tow a trailer. It is easier to tow a trailer b/c the motor is higher in the rpm.
Chase
Chase
TECH Addict
Joined: Oct 2003
Posts: 2,620
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From: Central, MA
Yeah, it's pretty much already covered here, but my '04's tow-haul sounds a little different.
WOT shift points are both set at 5,200..... vs 5,600 for the 1-2 and 5,200 for the 2-3.
The upshift downshift parameters are changed so that shifting is "more consistant." (my wording from what I read in my owners manual).
I found that my shift pressures were actually REDUCED in tow/haul. Not by a lot, but in all of the part throttle cruise ranges you'd typically be in.
That's all...
WOT shift points are both set at 5,200..... vs 5,600 for the 1-2 and 5,200 for the 2-3.
The upshift downshift parameters are changed so that shifting is "more consistant." (my wording from what I read in my owners manual).
I found that my shift pressures were actually REDUCED in tow/haul. Not by a lot, but in all of the part throttle cruise ranges you'd typically be in.
That's all...
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