Wrap the cats; yes or no?

Discussion in 'Generation 4 - Performance Upgrades' started by STAN SCHWARTZ, Jul 23, 2019.

  1. STAN SCHWARTZ

    STAN SCHWARTZ SHO Member

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    So my PPE cat'd downpipes came Monday and I want to wrap them before installation. ...and they are a thing of beauty.

    This seems to be along the lines of a religious question but... Should I wrap the cats or not?

    I think the cats will be biggest heat source... So not wrapping them makes me wonder if I should bother wrapping at all.

    Thoughts?


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  2. krewat

    krewat SHO Member

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    I'm going to pose a purely philosophical question here: The cats get HOT - they might be better off radiating the heat than trapping it inside?
     
  3. STAN SCHWARTZ

    STAN SCHWARTZ SHO Member

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    Isn't that the point of the wrap though...to stop it from radiating the heat in to the engine compartment, and sending it out the tailpipe?


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  4. luigisho

    luigisho SHO Member

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    I don't have a GenIV SHO so i'd have to look at a diagram, but I guess my decision would be based on whether these radiated significant heat to the ptu and wrap could keep the fluid from being cooked. If I had high confidence that temps and fluid degradation in the ptu would be reduced then I would pull the trigger
     
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  5. 76FoMoCo

    76FoMoCo SHO Member

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    I did not wrap mine and I don't see them putting out much more heat then the factory cat. JMO
     
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  6. STAN SCHWARTZ

    STAN SCHWARTZ SHO Member

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    Did you wrap the pipe at all?


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  7. luigisho

    luigisho SHO Member

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    I had read from other members posts (not an exact science!) that perhaps the exhaust routing and proximity may produce excessive heat transfer to the ptu and contribute to fluid degradation. OEM or aftermarket piping should not matter unless the proximity to the ptu was changed.
    Alot of qualifiers. However anecdotal evidence is also used to recommend drive train fluid changes vs Ford guidance that these are lifetime fluids.
     
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  8. 76FoMoCo

    76FoMoCo SHO Member

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    NOPE, I have 10K miles on it with the pipes and even changed the ptu fluid half way ( against fords guidance) and it looked good. And it has been down the track 30 time since the pipes. ;)
     
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  9. SHOinVa

    SHOinVa SHO Member

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    I had mine thermal coated, and it made an overall difference, Yes it is better to keep the heat in the pipe instead of heat soaking everything around them. There is some belief out here the heat from the cats is what causes the PTU oil to deteriorate so quickly but that is just an educated guess, I agree with it but I cant prove it. Kind of up to you, if you have not installed them yet its not to late to have someone thermal coat them.
    C/
     
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  10. SM105K

    SM105K Land Yacht Pilot Supporting Member

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    I am working on my DP's and I will wrap them front to back. I don't have to worry about rust because AZ, and I feel the car and my PTU will be a lot happier.
     
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  11. Jus2quik

    Jus2quik Member

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    I’ve been debating about wrapping my factory cats ,might just do it if I can get in there without pulling them,the heat gets insane around that Ptu ,gonna break out my heat gun tomorrow and see
     
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  12. 76FoMoCo

    76FoMoCo SHO Member

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    we get a lot of weather and the wrap holds the moisture and will rot most pipes. FYI the pipes are stainless the cat is not! A magnet will stick to them.
     
  13. Jus2quik

    Jus2quik Member

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    They would need replacing before they would rust through unless your running on salt roads then the whole car will be rusted out ,no worries
     
  14. SuperPete

    SuperPete Member

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    Brining this post back to life.
    I have PPE Downpipes on the way, deciding on wrapping them
    Well more like debating, I know wrap needs to happen or the PTU will cook.
    I am in Pensilvania, heavy rains, snow, salt, name it we got it.
    I was thinking to wrap pipe only to the bent part, from turbo down and stop there, undercarriage plastic guard under engine should protect that part from direct water and salt exposure.
    Another thing I was kind of arguing is when people say that water will rust the pipes, well, first of all they are stainless, second they are hundreds of degrees hot, they should dry out in no time, that moisture should be done, its like putting iron on wet cloths, dry in seconds, right?
     
  15. Majestic

    Majestic SHO Member

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    SS will still rust, especially after it's been welded on.
     
  16. SHOinVa

    SHOinVa SHO Member

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    If you paid the extra money and had them thermal coated you should be fine, if you didn't my advice is to find someone locally and have it done before you put them on the car. IMHO it made a difference in may car and once its on you never have to worry about it again.
    Charlie
     

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