F355 CEL codes are real - Page 7 - Ferrari Life
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post #121 of 155 Old 05-05-2015, 06:51 PM
 
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I have some on order....thanks for the heads up. Should I email them and ask for the right size holes?
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post #122 of 155 Old 05-06-2015, 05:01 PM Thread Starter
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Ahh crap

I've got the car back together and both sides are leaking exhaust at the connection of the new cats

Tomorrow I will tight the bolts some more and see if that helps but I suspect I need new gaskets:

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post #123 of 155 Old 05-06-2015, 06:56 PM
 
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Ahh crap

I've got the car back together and both sides are leaking exhaust at the connection of the new cats

Tomorrow I will tight the bolts some more and see if that helps but I suspect I need new gaskets:

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well that sucks. It looks like there are four of them. 2 for cats and two for by pass. I will order some of those for my project. Thanks for the heads up.
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post #124 of 155 Old 05-07-2015, 12:05 PM
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Dave,
I hope you don't skin another knuckle! Does NY have anything similar to the Calif. law that mandates OEM only on emission equipment? If the car tests clean, I doubt that any inspector would catch the non-OEM, BUT - - -. For us, it looks like re-core is the way to go.
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post #125 of 155 Old 05-07-2015, 12:21 PM Thread Starter
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Dave,
I hope you don't skin another knuckle! Does NY have anything similar to the Calif. law that mandates OEM only on emission equipment? If the car tests clean, I doubt that any inspector would catch the non-OEM, BUT - - -. For us, it looks like re-core is the way to go.

Nope - only OBDII check - no sniff, no visual (at least in Erie County where I live - NYC my be different)
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post #126 of 155 Old 05-07-2015, 02:11 PM
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Looks nice. Appears to be the same as whoever Magnaflow uses.
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post #127 of 155 Old 05-07-2015, 02:36 PM Thread Starter
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Looks nice. Appears to be the same as whoever Magnaflow uses.

Jim, when you made yours, did you have any issues with the connection to the headers? I still cannot believe mine are leaking - I'm pretty meticulous and tightened them real well (so I thought). I noticed the OEM flanges have a much larger chamfer that mates with the flare of the cat end - the Evoflows seem about 1/2 the size.
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post #128 of 155 Old 05-07-2015, 03:10 PM
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Jim, when you made yours, did you have any issues with the connection to the headers? I still cannot believe mine are leaking - I'm pretty meticulous and tightened them real well (so I thought). I noticed the OEM flanges have a much larger chamfer that mates with the flare of the cat end - the Evoflows seem about 1/2 the size.
Dave I had no issues with the original gaskets. When I ordered the materials I bought flared sections and they made them to original dimensions.
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post #129 of 155 Old 05-07-2015, 03:44 PM
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Dave, I'm sure you have, but just in case, have did tried to rotate the cats a little to make sure they match the angle coming off the headers?

If you are going to tell someone how to remove a bolt you should at least know which way to turn the wrench.
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post #130 of 155 Old 05-07-2015, 04:54 PM Thread Starter
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Dave, I'm sure you have, but just in case, have did tried to rotate the cats a little to make sure they match the angle coming off the headers?
Yes, however I do have some limitations with my custom pipes (in place of muffler) as the connection is rigid.

Here is the driver's side that I just loosened - looks like it seat fine to me.
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post #131 of 155 Old 05-07-2015, 04:55 PM
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Dave, I'm sure you have, but just in case, have did tried to rotate the cats a little to make sure they match the angle coming off the headers?
That could do it ! Doesn't take much rotation for the flange to not seat correctly
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post #132 of 155 Old 05-07-2015, 05:02 PM Thread Starter
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post #133 of 155 Old 05-07-2015, 05:19 PM
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Here is the driver's side that I just loosened - looks like it seat fine to me.
Agreed, looks spot on.
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post #134 of 155 Old 05-07-2015, 05:29 PM Thread Starter
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Passenger side

I've got a bad feeling about this....

If the new gaskets don't work, I'm gonna blow a gasket....
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post #135 of 155 Old 05-07-2015, 06:06 PM Thread Starter
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Old gaskets. Some kind of powder metal (I snapped one from my 95 to see). Look like crap to me but I have no experience with these to judge
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post #136 of 155 Old 05-08-2015, 03:40 AM
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Those donuts look a bit old, but most likely still OK. A couple of things worth mentioning, as it appears that you're reusing the old hardware. With the washer-spacer/spring-washer on the flange bolt, you are limited on just how tight you can go if you run out of threads on the bolt. Huh, you say? If the flanges on your new cats are thinner than OEM, you can bottom the locking nut on the partially threaded bolt, hence limiting just how tight the fasteners really are. I just ran into this on a F355 with a CEL and subsequent exhaust leak found at the crossover pipe. (The bolts used were too long, hence the threads bottomed on the nut before the flange was tight. This may not be the case with your car, but worth a closer inspection.

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post #137 of 155 Old 05-08-2015, 04:02 AM Thread Starter
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Thanks, Dave. I will measure the old flange and new. I had these almost as tight as I could make them (near spring solid height)

I assumed (wrong of me) that the new cats would have had flanges that were exactly like OEM. Needing to drill out the mounting holes should have been the first clue they are not.
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post #138 of 155 Old 05-08-2015, 04:41 AM
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I assumed (wrong of me) that the new cats would have had flanges that were exactly like OEM.
I don't like to assume anything with these cars...But, with that said, just look at the threaded portion of the bolt and see if you've got enough thread to adequately tighten the bolt without bottoming. The flange can be difficult to measure if the cone depth/angle is different from OEM.

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post #139 of 155 Old 05-08-2015, 05:11 AM Thread Starter
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Originally Posted by David @ FluentInFerrari View Post
I don't like to assume anything with these cars...But, with that said, just look at the threaded portion of the bolt and see if you've got enough thread to adequately tighten the bolt without bottoming. The flange can be difficult to measure if the cone depth/angle is different from OEM.

Last night when I started looking at this, the first thing I did was tighten a bit more and I did have the thread to do so - I completely understand what you are saying though. Then I decided - screw it - I've ordered the new gaskets - might as well install them so I then began dis assembly.

I have a funny feeling this issue is related to the flare of the tube (although it appears correct by eye) and the chamfer (cone) of the flange. The OEM is very large and makes contact with the entire flare - the Evoflow is only about 1/2 size and I think I'm getting a radial line contact only.
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post #140 of 155 Old 05-08-2015, 05:28 AM
 
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Old gaskets. Some kind of powder metal (I snapped one from my 95 to see). Look like crap to me but I have no experience with these to judge
Just throwing this out there. It appears one of those gaskets has an extra shoulder on it. Any chance they install one direction?
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