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09-05-2006, 08:37 AM
If you remove the exhaust after the cat in order to fit your long arms, PLEASE install an exhaust turn-down (if you don't have the exhaust re-done)! If you don't install the turn-down, the hot exhaust gases will point directly at the plastic gas tank and will eventually weaken and puncture the tank. This happened to Snowmore (Jeff Bay) a few years ago and we had to patch the gas tank (and get a turn-down pipe).
This past weekend I was wheeling with another Jeeper who had this same dangerous setup. Luckily I had a removable turn down exhaust tip I install for emission testing, so we could get the Jeeper home safely.
If you have your long arms installed, please take enough interest in the install to make sure the installer uses an exhaust turn-down.
09-05-2006, 10:19 AM
X2!
This happened to ChrisL back in the day as well.
09-05-2006, 12:48 PM
Ive seen this also boil the fuel in the tank, very dangerous.
But I think if you hack your exhaust off, and do nothing about correcting, thats your own fault. Darwin award time.
Originally Posted by DankNesS
09-05-2006, 01:01 PM
I used the stock turndown =D
09-05-2006, 04:47 PM
Good to see this today. My tailpipe got pinched and ran over when I rolled backed off of a steep hill the other day. I just cut it off and now the exhaust comes straight out of the muffler. Since I have a Flowmaster 40 series, its a little loud inside. I thought that it was the only bad side-effect. I'm gonna be faster now about replacing the tailpipe. I don't want to roast a hole in the gas tank. That would really suck.
-RC
09-05-2006, 04:53 PM
Oh one question for you guys with the turndowns:
Are you guys worried about carbon monoxide leaking into the cab? I know the exhaust goes out the back for a reason.... It's probably not a problem when you're going down the road, but sitting at a stop light or idling in a parking lot some could leak in the cab, right?
Maybe not, but it's a big risk anyway...
-RC
09-05-2006, 05:00 PM
Ive seen this also boil the fuel in the tank, very dangerous.
09-06-2006, 12:09 AM
I cut the tailpipe off at the muffler on my truck about a month ago or so when I lost a rear spring and came down and mashed up my rear bumper and exhaust. I didn't feel like paying the exhaust shop another $75 bucks to replace it again (2nd time mangling the exhaust) with another 2.5" pipe so I went to Kragans and $8 bucks later I had a turn down and a hanger. It's WAY louder now as I have a Flowmaster Delta 40 but I don't really smell the exhaust in the cab, then again I always use my A/C and I hardly have my rear windows open when I'm not.
Fred R.
09-06-2006, 12:22 AM
I've been running without a tailpipe or turndown for around 8-10 months now and no adverse affects. I know its not the best idea but I'm going to have to redo the exhaust for the LA's in the near future so why waste $ on it now.
09-06-2006, 01:46 AM
Hmmm, $5 for a clamp-on turn down or risk immolation.
I can see why the decision is so tough.
09-06-2006, 02:02 AM
I don't have much to live for anyway.
09-06-2006, 08:45 AM
It's not that it's just a bad idea... IT'S ARROGANT AND STUPID.
Simple fact is that we've seen holes blown through the plastic tanks by people doing the same thing. WHY IN THE HELL would you not spend a happy meal for a turn down?
09-06-2006, 09:09 AM
I don't have a turndown...or a muffler for that matter. Just the cat so it is a loooong way from the gas tank. I have been meaning to finish the exhaust but it was hot, and now I am lazy and cheap.
09-06-2006, 09:29 AM
so is running one metric 8 bolt in a single upper control arm. It's on the list of things to get to, I haven't even driven the jeep 10 miles in the last month anyway.
09-06-2006, 09:32 AM
Yeah I just used the tip of the stock tailpipe on my setup. It ends up basically under the back doors. Just just a tad lower than the frame rail.
09-06-2006, 10:19 AM
Thanks for the post. I've been running with just a muffler (no cat or turn-down) for a few months. Although I believe the gas tank issue is when you are still running a cat and the muffler ends much closer to the tank. My muffler probably ends before the back doors begin but Im going to pick up a turndown soon anyways.
About fumes in the cab, You can always smell my exhaust as I have no cat, but I usually roll with my windows down and I've sat in traffic for some time and I'm not dead (bit of a bad way to test huh). As long as your getting FRESH air in, you are fine. I would recommend a turndown but don't make it turn straight down towards to ground. Angle it so it's pointing towards the side of the car as well as down. And don't drive around with your rear hatch window open, then you are really inviting exhaust fume problems.
09-06-2006, 11:41 AM
The only thing bad about the turndown is water crossings. I found it took a bit of power to keep the engine running in deepish (hood level) water. I supposed you'd need to put a stack to avoid that though.
I can see it now, ZJ with a bit chrome stack and tractor flapper.
09-06-2006, 11:45 AM
Sweet...
09-06-2006, 12:29 PM
Hey Puma, funny, I didn't see your rig at GSW. It was aircraft grade, like te stock lowers.
Anyway my bolt made for a shity trip, while your time bomb is a Darwin award in the making.
If there's no muffler I wouldn't worry about it, but Chris L's wasn't that close to the tank and almost went KABOOM.
Like Nate said use some scrap and make one.
09-06-2006, 06:01 PM
It mostly depends on where your tail pipe ends if its a stock or near stock length a turndown is a must. If its a short muffler hats pushed forward there is a lot less worry. i ran mine for awhile without one but my muffler ends where the longarms begin. That said I run an elbow instead of a turn down it keeps the noise down a lot better.
09-06-2006, 11:03 PM
Boiled the gas in my tank, melted a johnny joint bushing in an upper link and the whole axle shifted and caused a rear tire to rub the spring and put a hole in the side wall and just about had the heat shield melt a hole in the tank because it all got hot when the turn down fell off doing 85 up a hill trying to make it to moab. Turn down was not welded on. Needless to say I didn't make it moab. Run a turn down.
Chad
11-23-2006, 03:05 PM
I wasn't aware of this until it happened to me too. I Got my LA install done at a shop about 3-4 hrs of intersate driving away.....first time I stopped for gas...when i uncorked it, the tank hissed at me (air pressure coming out). I didn't know WTF it was....then, when i went to put fuel in, there was so much pressure in the tank, that it kept tripping the "I'm full" valve in the gas pump, so I couldn't even put gas in it for a few minutes until it cooled off to a stable temp.
Needless to say - I got my exhaust back on REAL quick.
11-23-2006, 09:43 PM
When I was using just a down pipe I could sometimes smell fumes. So I bought a cat for 80 bucks that was 13" long, a muffler for 20 bucks 16" long, two 30% bends, two 45% bends, a short straight piece and a bunch of clamps. Now I have a complete 2.5 system with a tail pipe out the back on my longarmed ZJ for under 140 buck. You should be able to see a good pic of it in the next issue of JP mag.
12-12-2006, 02:41 AM
Thanks for bringing this up, Tom. It's something that many don't think about before something "bad" happens to them. We have had several customers cook their poly bushings in their rear tri-link setup after installing one of our long arm kits, and not heeding the warning in the install instructions to install a turndown at the same time, even if you're on the way to an exhaust shop. You could drive with a bit of slop in the tri-link...that's not the issue; but it's hard to drive with fuel leaking out of your tank due to melting a hole in it...or worse, driving it while it's on fire. Fun.
Kevin
01-02-2008, 01:18 AM
i have a turndown and the fumes really are not that bad but i do seem to get a little loopy and really sleepy in traffic.
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