New tune for a new camper????

BigSur · #1 Mon, April 25th, 2011, 10:36 PM

Just looking for some quick advice here. I'm about 1 week from purchasing a brand new camper

I'm upgrading from a small Jayco popup to a 26' Jayco travel trailer. "Dry weight" on the camper is about 4,800 lbs....I'm assuming I'll be closer to 5300 lbs once loaded.

My plan is to run on the stock 87 tow tune for now. Is that a good decision? What advantages will I see with a custom tow tune???

Any help is always appreciated. Thanks in advance Jack

P.S. On another note, I had a complete brain fart tonight.....removed the Gryphon w/out returning back to stock, and tried to update my tunes. Yes, I'm an idiot....I've read and been told a MILLION times not to do that. Luckily, all that happened was Pegasus said "can not update til you return to stock". SO...I reinstalled, switched to stock, and successfully completed the updates. I haven't reinstalled the unit as of yet but I think all is well. Do you think I'm okay here.....other than the red spot on my left cheek from left hooking myself?

ticopowell · #2 Tue, April 26th, 2011, 01:15 AM

Quote:

Originally Posted by BigSur

Just looking for some quick advice here. I'm about 1 week from purchasing a brand new camper

I'm upgrading from a small Jayco popup to a 26' Jayco travel trailer. "Dry weight" on the camper is about 4,800 lbs....I'm assuming I'll be closer to 5300 lbs once loaded.

My plan is to run on the stock 87 tow tune for now. Is that a good decision? What advantages will I see with a custom tow tune???

Any help is always appreciated. Thanks in advance Jack

P.S. On another note, I had a complete brain fart tonight.....removed the Gryphon w/out returning back to stock, and tried to update my tunes. Yes, I'm an idiot....I've read and been told a MILLION times not to do that. Luckily, all that happened was Pegasus said "can not update til you return to stock". SO...I reinstalled, switched to stock, and successfully completed the updates. I haven't reinstalled the unit as of yet but I think all is well. Do you think I'm okay here.....other than the red spot on my left cheek from left hooking myself?

Lucky guy... Because you had the most up to date pegasus installed you should be ok, it knew that you still had your truck tuned so it wouldnt touch anything in the Gryphon.
A custom tow tune will take into account the extra weight that you are adding as well as your driving style and where you live. the canned tow tune will work until you get the custom one loaded, but I still think you will like, and your truck will like, the custom one better than a canned tune.

***Longshot270*** · #3 Tue, April 26th, 2011, 10:32 AM

Your truck should be able to pull it pretty easily stock but custom tunes will definitely help out. We pulled a 26' jayco behind my parent's expedition and it was a 4.6L

***Jackpine*** · #4 Tue, April 26th, 2011, 10:59 AM

Very good replies, Ticopowell and Longshot. You young guys are on the ball.

As I posted in another thread, the updates to Pegasus have corrected some deficiencies in the user interface, among other things. One of those deficiencies was not rejecting a programmer holding a tune. Yours is fine - go ahead and use it.

The issue of towing with the new popup is a bit more subjective. I think the canned tow tune is pretty nearly designed for towing a trailer with that weight (in the 5000# range). It's certainly going to be a valid tune to use when you get that camper.

But, a custom tune MAY perform enough better to justify the cost. I think I'd like to talk to Bill about that. I doubt the difference between custom and canned will blow you away, but it MAY "feel" better and be slightly better on gas consumption. Regardless, Bill will not try to "sell" you on a custom tune if he doesn't think it's really worthwhile.

You're going to feel like you're living in a mansion when you get the new camper! What are you going to do with all that room?

- Jack

BigSur · #5 Tue, April 26th, 2011, 01:30 PM

Thanks guys...appreciate the advice. One thing to consider is that the new camper is 4,785 lbs "dry". Once I add cargo, and if I had anything in my tanks, I could easily be pushing 7,000lbs. With that said, $30 for another tune that might help is definitely worth it IMO.

Should I try to get ahold of Bill direct on this?

***Jackpine*** · #6 Tue, April 26th, 2011, 08:41 PM

I'm tempted to move this to the "Towing" forum, and may do so eventually.

Be careful loading things in the trailer. If you actually have 7,000# there, your tongue weight should be 840-1050#. (12-15% of 7000.) Now, this can easily exceed your truck's rear axle limit unless you use a Weight Distributing hitch, which I think you need to use anyway if the trailer is in the 5000# range. But notice, the 1050# tongue weight is a Class IV WD hitch, and I think 600-750# for 5000# is too.

Also, what is the load rating on your trailer axle/tires? You should ideally not go higher than 80% of that figure.

Regardless, I URGE you to take your truck/trailer combination to a truck scale and get things weighed. You can get one weight with your truck's two axles on separate platforms and the trailer axle(s) on the third, and then do a separate weighing with the trailer disconnected on the third platform and the truck by itself on the first two platforms. This way, you will know your truck's axle loadings (with and without the trailer), and, you'll know the total weight of the trailer. DO NOT take the trailer manufacturer's word for anything!

Tell the person in charge of the scale what you want to do before driving on it. I think he/she will be very accommodating. And unless there's a big lineup of big rigs, you can take your time. When I did it here in Tucson, it was $9.00 per weighing. It was cheap information that led me to have my trailer axle moved forward 3" to balance the trailer properly (my "dry" trailer weight was actually higher than the manufacturer's spec, and the tongue weight was much higher than it should have been - overloading my WD hitch)!

Yes, talk to Bill if you can reach him about the advisability of a tow tune.

- Jack