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Thread: 2 1/2" vs 3" Exhaust and Diff Heat

  1. #16
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    Re: 2 1/2" vs 3" Exhaust and Diff Heat

    You may have a very valid point! Why oh why did GM not include a diff cooler?!?!?

    Bill


  2. #17
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    Re: 2 1/2" vs 3" Exhaust and Diff Heat

    Quote Originally Posted by 5CTRVET
    You may have a very valid point! Why oh why did GM not include a diff cooler?!?!?

    Bill
    Good question. I keep hearing this diff cooler dilemma...where can we get one (and sorry, no, I didn't bother to search) and how much $$$ and PIA to install?

  3. #18
    urbanski is offline Cadillac Owners 10000+ Posts
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    Re: 2 1/2" vs 3" Exhaust and Diff Heat

    how about different rear end lubes? like Amsoil? would that make heat less of an issue?

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  4. #19
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    lasstss is offline Cadillac Owners Connoisseur
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    Re: 2 1/2" vs 3" Exhaust and Diff Heat

    Just a comment on exhaust. I deal with stainless components everyday. I have not taken measurements yet but I think you will find that stainless is a really bad radiator! as opposed to steel. You can get pretty close to a hot stainless pipe before you really feel the heat. IMO
    Unless you are sitting in traffic and its 105 in Phoenix, I dont think the exhaust is going to cause the diff to get hot enough.

  5. #20
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    Re: 2 1/2" vs 3" Exhaust and Diff Heat

    Of Course GM engineers say that wheel hop is a natural part of operation too

  6. #21
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    Re: 2 1/2" vs 3" Exhaust and Diff Heat

    Quote Originally Posted by lasstss
    Just a comment on exhaust. I deal with stainless components everyday. I have not taken measurements yet but I think you will find that stainless is a really bad radiator! as opposed to steel. You can get pretty close to a hot stainless pipe before you really feel the heat. IMO
    Unless you are sitting in traffic and its 105 in Phoenix, I dont think the exhaust is going to cause the diff to get hot enough.
    what about titanium exhausts?

  7. #22
    Dreamin is offline Cadillac Owners Connoisseur
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    Re: 2 1/2" vs 3" Exhaust and Diff Heat

    I have not taken measurements yet but I think you will find that stainless is a really bad radiator! as opposed to steel.
    lasstss is absolutely right!

    Stainless Steel is a very good thermal insulator, (very low Thermal Conductivity), which is why it's used in heat shields all over the place.
    http://www.matweb.com/search/Specifi...?bassnum=Q304A

    Aluminum however is a very good thermal conductor (Thermal Conductivity is 10x higher than SS)
    http://www.matweb.com/search/Specifi...bassnum=MA0001

    Titanium is an even better thermal insulator than SS.
    http://www.matweb.com/search/Specifi...bassnum=MT0001


    FWIW, many of the C5 guys that track their cars take apart their perfect good stock brakes and replace the factory aluminum brake pistons with Stainless Steel ones! Effectively adding a heat shield between the brake pads and brake fluid. I've done mine, it's a major PITA... but it make a big difference.
    http://www.dougrippie.com/drm/brake_...aliper Pistons

  8. #23
    Dreamin is offline Cadillac Owners Connoisseur
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    Re: 2 1/2" vs 3" Exhaust and Diff Heat

    I keep hearing this diff cooler dilemma...where can we get one (and sorry, no, I didn't bother to search) and how much $$$ and PIA to install?
    Haven't heard of a specific kit for the V, but C5 places like LPE, Mallett, Dougrippie can easily put something together for you.

    Cost (guessing): $650-$850

    Install: Yes, a major PITA... you need to mount the radiator part somewhere... the pump... get power to the pump... (pumps are LOUD!)... probably a thermostat, and then all the hoses and fittings.

    It's always the classic argument against having oil cooler all over the place... lots of plumbing, lots of weight, lots of $$$, and lots of FAILURE POINTS.

    Clearly, the risk of something failing in the cooler: pump dies, something hits an oil line, and you dump oil all over the freeway and destroy your diff anyway FAR OUT WEIGHS all this 3" exhaust nonsense!


    Tranny and diff cooler radiators and pumps... no oil lines yet:
    Last edited by Dreamin; 08-08-04 at 05:14 PM.

  9. #24
    Dreamin is offline Cadillac Owners Connoisseur
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    Re: 2 1/2" vs 3" Exhaust and Diff Heat

    Why oh why did GM not include a diff cooler?!?!?
    Because 99.7% of CTS-V owners will not drive their cars hard enough to overheat the diff oil (i.e. on a track).

    The diff's aren't failing due to overheated fluid... they are failing because they cant handle the engine power and/or the stress from wheel hopping.

  10. #25
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    Re: 2 1/2" vs 3" Exhaust and Diff Heat

    Quote Originally Posted by Dreamin
    Because 99.7% of CTS-V owners will not drive their cars hard enough to overheat the diff oil (i.e. on a track).

    The diff's aren't failing due to overheated fluid... they are failing because they cant handle the engine power and/or the stress from wheel hopping.
    Quoted for truth.

    I doubt most of us, even with the 3" exhaust, will see any real detriment over that which is already created by wheelhop and higher than designed for (?) horsepower levels.

    So, I guess the next upgrade will have to be a spool for the drag racers and a high(er) performance, stouter differential for us curvy road drivers!

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