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Supercharger & Burned CATs

Discussion in 'Performance and Tuning' started by Chickadee, Aug 9, 2017.

  1. Aug 9, 2017 at 7:12 AM
    #1
    Chickadee

    Chickadee [OP] No, It's not my husband's truck.

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    OME lift, Relentless Bumpers, Supercharged, UCON
    Looking for some advice. I'm not super mechanically talented & know just enough to be dangerous. Reading this forum over the past year has been very helpful.

    This is a long story - I'll summarize: Had a local shop install the Magnusson SC, AFE headers with CATs & the Bully Dog GT back in December. Upgraded to the stealth pulley in January to adjust for the altitude (6500 ft).

    Initially was very happy with everything except crappy MPG (12 in town, 14-18 hwy) Had a few misfires at idle for the first couple months, but no CEL. I then drove it to TX in April (about 2200 miles round trip) & burned out my factory CATs. MPG was 12-13 for the entire trip, running at 70-75 mph on cruise.

    The shop deleted the factory CATs & did a new dyno run. Told me it was running a bit rich at WOT, but I should be fine & not to worry about it at all. Said he would contact Magnusson to get a modification on the tune.

    Truck continues to get poor MPG, & CEL came on. Initially P0420, now both P0420 & P0430.
    I cleaned the MAF, reinstalled the factory air filter in place of the K&N & reset the codes - they came back.

    Had a local exhaust shop inspect my AFE CATs - completely burned out.

    Shop that did the initial install told me they would 'take care of everything & make this right'. That was 2 weeks ago & I've heard nothing from them.

    My initial plan is to call Bully Dog to see what they can do for me. Any other suggestions? I don't currently have AFR or boost gauges. I'll post the dyno runs.
     
  2. Aug 9, 2017 at 7:14 AM
    #2
    Chickadee

    Chickadee [OP] No, It's not my husband's truck.

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    OME lift, Relentless Bumpers, Supercharged, UCON
    Dyno pre-SC

    Taco Dyno Stock.jpg
     
  3. Aug 9, 2017 at 7:15 AM
    #3
    Chickadee

    Chickadee [OP] No, It's not my husband's truck.

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    OME lift, Relentless Bumpers, Supercharged, UCON
    Dyno with SC, & headers, stock pulley

    Taco Dyno Charged.jpg
     
  4. Aug 9, 2017 at 7:16 AM
    #4
    Chickadee

    Chickadee [OP] No, It's not my husband's truck.

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    OME lift, Relentless Bumpers, Supercharged, UCON
    Dyno post CAT deletion, stealth pulley

    Taco Dyno Post Pully & CAT.jpg
     
  5. Aug 9, 2017 at 7:19 AM
    #5
    inwood customs

    inwood customs Roaming potato

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    P0420/430 is because u have no cats.... no worries

    Dyno numbers look lethargic tho.
     
  6. Aug 9, 2017 at 7:23 AM
    #6
    rmepilot

    rmepilot Well-Known Member

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    I wished I could help, but I'm running the Magnuson S/C w/ BD tune and everything else stock.

    @Torspd
    @VolcomTacoma
     
  7. Aug 9, 2017 at 7:24 AM
    #7
    inwood customs

    inwood customs Roaming potato

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  8. Aug 9, 2017 at 8:01 AM
    #8
    Torspd

    Torspd Tor-nication

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    There has been another member or two to have the AFe cats blow out. Nothing the installation shop can do other than install new high flow cats.

    Is your dyno taken at 6000' elevation?

    The WOT AFR is good at 11:1.

    Install an O2 simulator for your CEL problem.
     
  9. Aug 9, 2017 at 8:06 AM
    #9
    Chickadee

    Chickadee [OP] No, It's not my husband's truck.

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    OME lift, Relentless Bumpers, Supercharged, UCON
    Dyno was done at 6500' elevation.

    I see the CEL as a symptom. What I want to do is figure out why it's burning out my CATs & getting such crappy MPG - seems like it's running too rich, even though the dyno says it's fine.
     
  10. Aug 9, 2017 at 8:17 AM
    #10
    Torspd

    Torspd Tor-nication

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    The CELs listed only read the cats. The ones installed might not have catalyzed well enough from the beginning. Then blew out.

    A CEL for running too rich would be more symptomatic.

    If you have an AFR gauge, you can visually monitor how rich it is actually running. Some even have the capability to datalog. Then you could have the data aquisition to prove it is running in a manner that needs an update for the tune.

    Or get a UCON.
     
  11. Aug 9, 2017 at 8:20 AM
    #11
    Torspd

    Torspd Tor-nication

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    How does it drive nearer sea level? Any changes in mileage?
     
  12. Aug 9, 2017 at 8:45 AM
    #12
    CoyoteRuns

    CoyoteRuns Well-Known Member

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    I'm getting 14mpg with 70/30 city/hwy and a heavy foot at sea level. Would love to get a little more, but I think that's what you get with a SC. I'm very interested to see how this issue works out.
     
    12TRDTacoma likes this.
  13. Aug 9, 2017 at 8:58 AM
    #13
    Torspd

    Torspd Tor-nication

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    How much larger are your tires from stock @Chickadee ?


    What is your tire pressure?

    How ofter are you laying into the skinny pedal?
     
  14. Aug 9, 2017 at 9:18 AM
    #14
    12TRDTacoma

    12TRDTacoma Powered by Ford, GM, VW, and Mercedes

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    Have not seen a cat blow out for too much fuel going through it. I have however seen it blow out for lean misfires or lean conditions. I have also seen them die due to there not being enough "meat" there also. I actually see that all the time when comparing aftermarket cats to OE. They have been defective even at the time of install because of lack of reduction bed material innards so they fail smog immediately or pop that check engine light for the same P0420/ P0430 code.

    If you run a cat converter at 14.7 air fuel ratio it will last you a VERY long time.

    Then there is also question in quality, which you may have gotten a defective one for lack of of QC or QA.

    I don't know how big the OE cat is in comparison to the AFE one, but I'd imagine the AFE's are smaller over stock, which as I mentioned can always be problematic.
     
  15. Aug 9, 2017 at 9:19 AM
    #15
    12TRDTacoma

    12TRDTacoma Powered by Ford, GM, VW, and Mercedes

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    That's about what I get.
     
  16. Aug 9, 2017 at 9:44 AM
    #16
    inwood customs

    inwood customs Roaming potato

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    Alot of it is the right foot if the trucks running right.
    The blower uses about 1/3 hp to run if its in bypass mode.
     
  17. Aug 9, 2017 at 10:09 AM
    #17
    Chickadee

    Chickadee [OP] No, It's not my husband's truck.

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    Tires are 265/70 on 17" rims @ 30 PSI

    Skinny pedal was very inactive during my TX trip.

    I don't have AFR or Boost gauges yet. Open to suggestions on those.
     
  18. Aug 9, 2017 at 10:16 AM
    #18
    Chickadee

    Chickadee [OP] No, It's not my husband's truck.

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    Didn't really notice any changes near sea level, but I was driving it very conservatively & trying to stay out of boost since I had the new exhaust noise develop during the trip (which I now know was my disintegrated factory CAT).

    Average MPG for the entire trip was 12.5. It improved slightly when I returned to CO - currently not driving it much, but most recent tank was 13 on mostly in town driving. Right after the SC was installed it was getting 14 in town & 18-19 hwy (if I drove nice :)
     
  19. Aug 9, 2017 at 10:22 AM
    #19
    Kyitty

    Kyitty Mr. Beard

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    I don't have a S/C. Just headers, front cat delete, and intake. Red = Before Headers. Blue = After Headers.



    Granted I'm at about 5,000 feet. But our numbers are too close.
     
  20. Aug 9, 2017 at 10:22 AM
    #20
    Chickadee

    Chickadee [OP] No, It's not my husband's truck.

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    I thought about them being defective too, but I've now blown out all 4 - the factory rears & the 'hi flow' AFE's on the headers. The truck only has 37,000 miles on it.

    Still learning about all the AFR stuff, but if it was running lean wouldn't my MPG be better?
     

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