There is plenty that can be done with exhaust and intakes on EFI modern engines. Look at the Ford MOD Motors and LSX motors. My own 11 Sec 1/4 LS1 Trans Am is a good example. The difference between an LS6 intake on an LS1 is about 15 to 20 HP at the wheels without a tune.
Next you do the tune and get even more gains. The best way to do it is on the Dyno.
Now having said that a catback alone won't do it. You may see a few hp at the wheels, but you won't even notice it and you will be out at least 500 bucks.
A complete exhuast system with a tune on a modern EFI vehicle may net anywhere from 20 to 40 RWHP depending on the engine and type of exhaust system.
My WS6 gained 26 HP and 32 FT/LBS of toruqe from a custom exhaust, stock cats and mid length headers. Then with the LS6 intake I picked up another 16 hp and 13 ft/lbs of torque. All at the wheels, Dyno proven.
Problem is you have to be willing to do the whole thing. Headers, Cats, exhuast and tune. So you are looking at a pretty good chunk of money. 1200 bucks for nice headers, 300 bucks for a dyno tune and at least 600 for a complete custom exhaust. More if you get an off the shelf catback.
If you are not trying to pick up tenths in the 1/4 mile, I am not sure it is really worth it unless you like the sound.
It is why my 6.0 Chevy truck, which is really similar to the 5.7 in my WS6 is bone stock minus a tune to change the Transmission shift points and when the torque converter locks up.
To the op, leave it alone until it falls off, then pick something nice. Performance or mileage won't be worth the cost.
Thanks everybody, and thanks to sleepy! Between here and the list he gave me on the phone, I've got a LOT on my plate to do! I knew there were a bunch of things to do here, but just have to find them. Sorry I haven't posted sooner, but my internet has been out for a few days. Hopefully I'll have some neat pictures to share in a couple months.
Jim...where do you live out there? I lived in Bremerton while I was stationed at the Bangor sub base and then over in Richland when I got out of the Navy before I moved here.
Nice Bullet! ^^^ They were as rare as Allisons when I lived out west but now I see 'em all the time living here!
To the OP...20' Allison XB-2003 with a 225 Mercury Promax. Fun little rig.
Interesting to read the responses here. I've got an '07 5.9, pretty much same as the OP's truck. I put gauges on a long time ago and kept the truck stock for a long time. You will be amazed how hot the EGTs on this motor will get in stock form. I've had mine at 1425 when I chickened out. I didn't figure I could hurt it in stock form but that seemed hot enough, haha! Contrary to popular belief, downshifting and winding it up actually produces higher EGTs. I've seen the hottest in the 2700rpm range. At lower rpm the computer is programmed to not give as much fuel and it is virtually impossible to get EGTs too high by means of lugging with the auto tranny.
I really like having my gauges, just gives me a little extra info on what the truck is doing. Boost/Tranny/Pyro. As far as cooldown goes, think of it like this: How many people out there who nothing about these trucks drive the wheels off them and never let them cool down and they just keep going? I let mine come down to around 350, but if you're waiting for 300 degrees, you'll be waiting for a while. Seems like wasted time and fuel to do that.
Now, since I've put the Smarty Jr. on, my EGTs are much lower at WOT and towing, but they do come up higher down low now. With reduced EGTs that temperature is now inside the cylinder so I've made a lower EGT limit for myself. That's another topic though.
I live about a half hour West of Knoxville. Lived here for about a year and a half and have yet to take the camper out. Hopefully in the next month or two things will settle down and I'll be able to get out for a night or two here and there.
I'm mainly looking for a place to go park the truck and camper and just relax, maybe walk around and do some practicing with my new to me SLR camera. I know there's a guy on here, "sleepy" I think, looks like he lives real close to me, I know I need to send him a pm sometime. Just curious where good places are around here. Always enjoy meeting other campers too. It's weird how some campgrounds people keep to themselves and others you talk to everybody that walks by. That's what I enjoy.
Thanks for any input! Have a good one,
My Arctic Fox has been sitting more than I had hoped for a while and is due for a wash from sitting. Got the streaks running down it below clearance lamps, windows, etc... I've used Nu Finish for years with great success. I bet if I were to ask about waxes it would about turn into an oil thread as there are so many choices.
My plan is to wash the camper with dish soap, and then use a foam pad on my buffer at a low speed (easier than elbow grease) with the Nu Finish. I've used this on my boat and car and truck with great results.
Pros or cons? Just thinking out loud. I've got a few projects to finish up, lawn, oil change on car and truck, and putting my work car, 89 Corolla, back together after pulling the motor to fix some pesky oil leaks. After that I plan on going somewhere with it even if just for a night. I've lived in east TN for a year and a half now and the camper hasn't been used that whole time. It's driving me nuts! Can't wait to get it back on the road.
Thanks for any input or advice. Have a good one,
I've been running mine for a while now. Do they ride a little stiffer? Yes. Is it bad? No. They are the worst on a washboard/pot hole filled road. Down the interstate they aren't bad at all, although you do feel the road a little better. Best way I can describe it is that it rides a little more like a truck. Honestly, the big rear sway bar made the ride worse than the 19.5s did. The only thing I dislike about my particular tire is the road noise, although I have gotten used to it. It's funny, the smoother the road is, the louder the tires are. Also, I don't air mine down either because it really doesn't affect the ride much. After airing down you gotta find someone with good air to get them back up to 90-100+ lbs or wherever you run them. Can't do that at the corner gas station.
To summarize, they aren't as bad as some would have you to believe, just expect a more "truck like" ride. Still smoother than dad's old '84 chevy!
One more update. Drove the truck to work the last couple days, mostly interstate. Had it up to 75 a couple times, cruising at 70 most of the time which is a little faster than I usually run. I typically run around 67ish for fuel mileage, but after putting over 100 miles since the balance job, I'm HAPPY! Rolls smooth as silk. Lot to be said for that road force balance. Just wanted to update and close out the thread. I hate it when threads go unfinished. Thanks to those here who helped, especially rv2go.
Just got back from Fleet Tire a short bit ago. Went over and started explaining what was going on and he said all was well until I mentioned the Equal, haha! They got me in quickly and I got to hang out in the shop while they worked on it. All the guys were nice and seemed pretty knowledgeable. They dismounted the tires, vacuumed out the equal, cleaned tires and rims up and put them back together. While balancing 3 of the tires were between .014 and .018 runout and one was .024. They said that was pretty good for those tires. I didn't get to drive a lot of highway on the way home due to a big wreck on the interstate, so I took the back roads. What little bit I did have it on the road I ran it up to 75 real quick and still felt smooth. I'll probably drive it to work tomorrow just to see, but as of right now I'm pretty happy. No noticeable vibration yet!
Just with my one trip there, I'd recommend these guys. Staff was courteous and answered all my random questions while out in the shop. They charged me $15/tire for all that. They said if I had any issues just come on back and they'd check it out.
Thanks for the advice everybody!
My 19.5's used to roll smooth as silk and then I took them off and they sat for a year. They have equal inside them. A few weeks before I took them off I aired them up for a big trip. I'm wondering if I didn't get some moisture in there. She vibrates on and off in the 65-70mph range now, right where I like to drive. I'm looking for a recommendation on a tire shop to get these balanced, and I'd rather have somebody that knows what they're doing work on it. Thanks!
Well, in an interesting turn of events, it started working. I haven't touched it. Went out a week or 2 ago to plug it in and top off the batteries and it was charging away. I've went out there several times since and it's been working every day. Kinda odd, but I'm not gonna argue. I guess I'll just keep an eye on it and if it stops working again I'll check that plug up top.
Arctic Fox is a good camper, just like everybody said though, they're heavy. Too heavy for stock tires. The guy I bought my 19.5s from had a short bed Dodge with a Lance on it and he said even with everything he did, the short bed truck just did not handle well with a bigger TC, and he's had quite a few setups. Now on the flip side, my long bed with the 19.5s is a beast and carries my camper quite well. Fully loaded with water and gear about as heavy as I can get it my camper is 42-4300 lbs. And that's an AF 811. The 990 will be heavier. I don't think you can put a 990 on a short bed. Whatever you end up getting, put a big sway bar on your truck too, you'll not regret it. Having a short bed definitely limits your options.
My 2010 AF 1140 has the slide out tray. The years before mine did not. Im sure the space was always there but they just didnt put in the door and tray. You might be best to call the factory and find out that info.
I'll probably do that tomorrow. Just thinking out loud right now, haha!
I've got a 2007 Arctic Fox 811 for a long bed. Before I bought it I looked at some other 811s but they were for short beds. I noticed they had a hatch in the back under the entrance door that had a tray that slid in and out for basement storage. I do not have that. I'm wondering if there is a tank in the way since I do not have the long overhang? Does anybody know if there is any open space under the floor? If there is, I wouldn't be opposed to putting a hatch in the floor for access if there is any room there. It would be nice to put tools and stuff I don't need much down there out of the way. Thanks for any help,
It was 3 days ago, but I finally got mine back! It's been sitting in Ohio for a year in my parents yard. Finally have everything straightened out and brought it down to TN the other day. Now to find somewhere to go, haha!
Oh, the other thing I've been doing, and this does count for today, I've been trying to figure out why my solar isn't working and believe I have tracked it down to what I hope is a bad connection up at the panel on the roof. Down side is that it's cold and I have to un-goop the screws and pull it off the roof to get to the plug, so that will have to wait for a warmer day. This pic was from this morning to keep in the spirit of the thread :)