Towing capacity

[JDopirak]

You notice all your gain is at 4000 rpm...

below 3000 no gain......

4.10 axles for sure.....

Yup all the power i gained from heads cam are in useless areas i rarely get to. I thought i did enough research and i actually spoke to customer service at texas speed so i thought i was good to go and would get gains where i actually needed it. I was wrong.

 

[JDopirak]

Those numbers are for Corvettes and cars and maybe regular cab short bed pickups. Anyhow, subtract your Cargo Capacity from your GVWR and that's your curb weight, then add yourself and minus the seats. With that number, we can mathematically computer your actual rear wheel horsepower based on your drag strip run(s).

Looks like 5,917 so without seats and then add me its around 5,957 race weight.

 

[swathdiver]

Looks like 5,917 so without seats and then add me its around 5,957 race weight.

Good, so that would be 303.26 RWHP.

Here's the formula: Race Weight x ((Trap Speed x .00426)^3)

So that was stock with a tune?

 

[avalonandl]

Yup all the power i gained from heads cam are in useless areas i rarely get to. I thought i did enough research and i actually spoke to customer service at texas speed so i thought i was good to go and would get gains where i actually needed it. I was wrong.

You can try the 4.10 since you have 3.42 now. Figure out your rpm's at cruise levels.

I am thinking you should just bore & stroke to about 7 liters....
But thats me... You could keep the 3.42 gears then.

 

[swathdiver]

You can try the 4.10 since you have 3.42 now. Figure out your rpm's at cruise levels.

I am thinking you should just bore & stroke to about 7 liters....
But thats me... You could keep the 3.42 gears then.

Stock 20s run about 1680 RPMs at 70 MPH, 3.73s @ 1834 and 4.10s @ 2016 RPMs. How did the old saying go? "There's no replacement for displacement!"

 

[JDopirak]

You can try the 4.10 since you have 3.42 now. Figure out your rpm's at cruise levels.

I am thinking you should just bore & stroke to about 7 liters....
But thats me... You could keep the 3.42 gears then.

Im having a 6.0 built so that should help a little.

 

[JDopirak]

Stock 20s run about 1680 RPMs at 70 MPH, 3.73s @ 1834 and 4.10s @ 2016 RPMs. How did the old saying go? "There's no replacement for displacement!"

Next time i tow ill have the dash cam running or maybe the gopro facing cluster and ill post it on youtube so you can see what im talking about. I do value all of your input ive learned alot. Ive been towing a 5x8 for years with my forester so owning and towing with a huge car trailer like this is one hell of a learning curve. And i learned as soon as i picked it up i went to big for the truck i have lol. But im not buying another truck any time soon so ill take my time and try to set the truck up as best i can to last as long as it can.

 

[Dantheman1540]

That 212/218 600/600 cam in a 6.0 with decent compression ratio 9.5-11.0 will pull like a champ down low! If the 5.3 dies and the cam is still good I would not hesitate for a second to put it in the 6.0. With the 1st gear ratio of the 6L80 being 4.56 I would not touch the 3.42 gears until you get the new motor in and see how it does. Also If you have had it tuned in the past and aren't using a 93 octane tune when towing you should. The little bit more spark advance that you can run with 93 will give it a peppier feel off the line.

Also most Toyotas especially the tundras seem to be geared really low from the factory I think some have come with as low a 4.56 with the towing package. That might be why the 4.6 tundra felt ballsy.

 

[swathdiver]

...the 1st gear ratio of the 6L80 being 4.56 I would not touch the 3.42 gears until you get the new motor in and see how it does.

FYI: 4.027

 

[Dantheman1540]

FYI: 4.027

Just went back to the google page that I found the 4.56 and for some reason when you google 6L80 gear ratio it brings up the 8L90 ratios first. Guess COVID even messed up google searching. Thanks for the correction . My opinion still stands I'd 6.0 before regear.