FJ60/FJ62 Exhaust differences (1 Viewer)

[dbbowen]

Thinking about Tigging up some 304 stainless bolt on exhausts for the 60 series from the manifold all the way back to the tailpipe and was wondering if anyone knew the differences between the 60 and 62 in terms of exhaust routing and everything. Could one exhaust be built for both vehicles or are there any differences in mounting?

My 60 had an aftermarket exhaust on it so i do not know what the oem one looked like, but im assuming they both had a cat.

For 2f/3fe trucks what would be optimal tubing size that yall would want? 2.5 inch? I was planning on adding o2 bungs for fj62s and fj60s with holley sniper. The 60 would just come with the bung with a removable hex cap

Is there even a desire for this? They might be kind of pricey but they would use the absolute best materials from Stainlessbros/TiCon, Vibrant Performance, etc all in 304SS, backpurged, and will probably outlast most of the truck.

There is also a stock hanger midway down the truck with 2 hangers in it, would you be willing to cut this hanger to tuck the muffler up higher for more clearance, or would it be better to build the exhaust based off of this hanger not being cut

Is the general desire for an oem replacement style quiet muffler or should I be looking at performance mufflers with a little more sound? The oem replacement mufflers use much lower quality Steel but are quieter.

Also, what is this little tube on this pipe in the photo? Is it needed for emissions or something? My truck did not have this on it when i got it

Any insight is very welcome.


Here is a picture of my trucks exhaust with a V8. The appearance will look like this. Will probably use mostly mandrel bends and not pie cuts


Before any heat cycles:

After its burned in:

 

[Devils Paw 80]

The stock 62 exhaust system is more complicated. It's one of the disadvantages of this model compared to a 60. You can look at and compare the routing at the SOR site.

Land Cruiser Exhaust Systems FJ60, FJ62, FJ80, FZJ80 & UZJ100 - Specter Off-Road

Toyota Land Cruiser parts since 1983. From the oldest FJ25 and to the newest Land Cruiser, Non USA or domestic 40 Series, 60 Series 80 Series or 100 Series, SOR has the largest selection of top quality new and used OEM and aftermarket Land Cruiser parts in stock in the world. Specializing in...

www.sor.com

 

[dbbowen]

The stock 62 exhaust system is more complicated. It's one of the disadvantages of this model compared to a 60. You can look at and compare the routing at the SOR site.

Land Cruiser Exhaust Systems FJ60, FJ62, FJ80, FZJ80 & UZJ100 - Specter Off-Road

Toyota Land Cruiser parts since 1983. From the oldest FJ25 and to the newest Land Cruiser, Non USA or domestic 40 Series, 60 Series 80 Series or 100 Series, SOR has the largest selection of top quality new and used OEM and aftermarket Land Cruiser parts in stock in the world. Specializing in...

www.sor.com

Whoah that is a perfect resource thank you. It looks much more complicated but could be simplified down pretty easily. Is there any necessity for the two cats on there besides emissions? it looks like there are two manifold exits then two cats and then they go into a Y pipe. Im wondering if you could put the Y pipe before the cat, then run one cat then have it go to the muffler and out the back in one pipe. Are there two O2 sensors?

 

[Devils Paw 80]

Whoah that is a perfect resource thank you. It looks much more complicated but could be simplified down pretty easily. Is there any necessity for the two cats on there besides emissions? it looks like there are two manifold exits then two cats and then they go into a Y pipe. Im wondering if you could put the Y pipe before the cat, then run one cat then have it go to the muffler and out the back in one pipe. Are there two O2 sensors?

Yes, 2 sensors. I believe a rerouting of exhaust has been achieved in some cases to get rid of the pipe that goes outside frame rail. That’s a bad design. Very “un Toyota like” as someone said to me. Not sure how it’s been done. Probably can find an example somewhere on MUD

 

[dbbowen]

Yes, 2 sensors. I believe a rerouting of exhaust has been achieved in some cases to get rid of the pipe that goes outside frame rail. That’s a bad design. Very “un Toyota like” as someone said to me. Not sure how it’s been done. Probably can find an example somewhere on MUD

Would something like this fit? Could put the o2 sensors on the 2 legs of the Y

 

[cps432]

You might run into fitment issues putting the cat that far up. The bell housing and transmission get pretty tight right there. It might also cause the driver’s area to get really hot having the cat right under your seat.

I’m not an expert here, but I think you want more straight pipe behind the collector before the cat. There’s a push-pull pulse created by the engine as it intakes and exhausts gases.

As I understand it, if there’s not enough pipe after the collector you start to lose the pull effect which causes excess exhaust to build up in the pipe rather than it getting forced out as the pistons do their thing.

The momentum of the exhaust exiting the pipe causes a draft that helps to pull the gases from the combustion chamber and into the exhaust system. Any disruption to this effect causes power loss problems in the engine as its working harder to evacuate the exhaust.

Also, the O2 sensors need to be far enough back from the collector to get an accurate reading of all the cylinders. And it needs to be far enough away from the cat that it doesn’t get cooked.

Someone smarter than me correct me if I’m wrong.

 

[ChaserFJ60]

The O2 sensors need to be as close as possible to the manifold, but not too close where they get cooked and dont get an accurate reading, and not too far where they dont get hot enough and return a delayed response to the ECU control system. The cat needs space in front of and behind it, It cant be too far or it wont work correctly if its too cold, but not too close where it melts. I routed my 62 exhaust exactly like @dbbowen drawing except I had a separate Y pipe combining the two exhaust pieces, a bit of a spacer, then the cat, a spacer, then the muffler. I'm sure you'll get a different suggestion from every person who responds to this thread. I think Toyota routed the 62 Exhaust the best way they could for the best overall performance in a stock engine. That being said, I dont know what im talking about when it comes to exhaust routing.

I will say that putting a catalytic converter back on my 60 was one of the best things Ive ever done. I can breathe with the engine running!

 

[dbbowen]

You might run into fitment issues putting the cat that far up. The bell housing and transmission get pretty tight right there. It might also cause the driver’s area to get really hot having the cat right under your seat.

I’m not an expert here, but I think you want more straight pipe behind the collector before the cat. There’s a push-pull pulse created by the engine as it intakes and exhausts gases.

As I understand it, if there’s not enough pipe after the collector you start to lose the pull effect which causes excess exhaust to build up in the pipe rather than it getting forced out as the pistons do their thing.

The momentum of the exhaust exiting the pipe causes a draft that helps to pull the gases from the combustion chamber and into the exhaust system. Any disruption to this effect causes power loss problems in the engine as its working harder to evacuate the exhaust.

Also, the O2 sensors need to be far enough back from the collector to get an accurate reading of all the cylinders. And it needs to be far enough away from the cat that it doesn’t get cooked.

Someone smarter than me correct me if I’m wrong.

Oh yeah that drawing wasnt to scale at all haha. Ideally the 2 pipes would merge next to the bellhousing, but the cat would be back by the transfer case above the crossmember. Something like this

 

[dbbowen]

The O2 sensors need to be as close as possible to the manifold, but not too close where they get cooked and dont get an accurate reading, and not too far where they dont get hot enough and return a delayed response to the ECU control system. The cat needs space in front of and behind it, It cant be too far or it wont work correctly if its too cold, but not too close where it melts. I routed my 62 exhaust exactly like @dbbowen drawing except I had a separate Y pipe combining the two exhaust pieces, a bit of a spacer, then the cat, a spacer, then the muffler. I'm sure you'll get a different suggestion from every person who responds to this thread. I think Toyota routed the 62 Exhaust the best way they could for the best overall performance in a stock engine. That being said, I dont know what im talking about when it comes to exhaust routing.

I will say that putting a catalytic converter back on my 60 was one of the best things Ive ever done. I can breathe with the engine running!

I was honestly thinking of either making a harness or providing instructions to wire both of the o2 pigtails into each other so you can just run one either at the Y pipe or whatever. On that diagram on SOR it doesnt look like there is a post cat o2 sensor. It looks like they are both right before the cats. You could easily just run them together. I had to do that on my is300 drift car because of spacing to get my CEL to turn off

 

[ChaserFJ60]

I was honestly thinking of either making a harness or providing instructions to wire both of the o2 pigtails into each other so you can just run one either at the Y pipe or whatever. On that diagram on SOR it doesnt look like there is a post cat o2 sensor. It looks like they are both right before the cats. You could easily just run them together. I had to do that on my is300 drift car because of spacing to get my CEL to turn off

I ran them both together for some time and switched back to keeping them at their respective banks, When routed separate Ive noticed a smoother idle

 

[dbbowen]

I ran them both together for some time and switched back to keeping them at their respective banks, When routed separate Ive noticed a smoother idle

huh, good to know. Glad I asked. On my LS i run them on the vertical portion of tubing before they flatten out under the truck. Could put them there but would require the harness to be lengthened probably

 

[cheeese]

There is also a stock hanger midway down the truck with 2 hangers in it, would you be willing to cut this hanger to tuck the muffler up higher for more clearance, or would it be better to build the exhaust based off of this hanger not being cut

if you remove the hanger, does something replace it to hang the muffler, and does that bolt to the body? I think more clearance is better than not *if* it's a constraint, ie if tucking the muffler higher makes it no longer the snag point in that area. if it's already protected by the frame, rear leaf, or something else then it might not be worthwhile to require body mods

 

[dbbowen]

if you remove the hanger, does something replace it to hang the muffler, and does that bolt to the body? I think more clearance is better than not *if* it's a constraint, ie if tucking the muffler higher makes it no longer the snag point in that area. if it's already protected by the frame, rear leaf, or something else then it might not be worthwhile to require body mods

Figure cutting that long bracket would be an easy mod for people to do. It’s like 4 bolts to remove it and just hitting it with an angle grinder

 

[cheeese]

yep that sounds totally doable especially if you can sneak a heat shield up there to compensate for less airflow around the muffler

 

[fl4031003]

Here is a system on my sons 62, all stainless and has been on since 2014. He has since swapped to a H55f

 

[Godwin]

Here is a system on my sons 62, all stainless and has been on since 2014. He has since swapped to a H50View attachment 3415533View attachment 3415534View attachment 3415535View attachment 3415536

No O2 senors installed in the exhaust and this is with a 3FE?

 

[fl4031003]

It’s got both 02 sensors and a cat, the sensors point straight up you can’t see them in my picture

 

[4Cruisers]

For my '86 FJ60 build with 3FE and H55f, I used an FJ62/FJ60 combination.

Exhaust manifolds to Y-pipe - custom section inside the frame rail, using the original flanges, O2 sensors, and bungs. Cost me all of $200 to have this fabricated at the local muffler shop that does the exhaust systems for a lot of the lowriders in the Espanola Valley. That custom section is bolted to the stock FJ60 catalytic converter. The catalytic converter is bolted to a short $20 custom transition section (same shop) to the stock FJ62 muffler/tailpipe assembly. The transition section was needed because the FJ62 tailpipe upstream from the muffler is about 6 inches shorter than the FJ60 assembly, and the flanges are different. I used the FJ62 muffler/tailpipe assembly from the FJ62 donor vehicle because it was fairly new and in good shape. All the hangers from the upstream end of the catalytic converter to the end of the pipe are stock FJ60 hangers. It turned out to be a very clean, inexpensive installation, plus I can use stock replacement components (with the exception of the first section) if needed in the future.

I'll try to post some photos later tonight.

 

[4Cruisers]

Photos:

 

[4Cruisers]

More photos: