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Need help. Went catless and i regret it

OP
OP

1slow.s650

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Could you tell us more about your cat failure and the CEL at delivery especially when the tune is 50 state legal CARB EO ?
Mind you I’m new to all this and wasn’t aware cats aren’t a good thing to run while being boosted let along what it’s pushing now. But after hearing all the potential damage and things that could go wrong I was afraid.
What @GregO is asking is how you aren’t getting CEL light with no cats as you stated in post 3.
i was. I was riding with the CEL for a long time it was until I got work done and foulers were installed.

IMG_3865.jpeg
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DevonTK

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robvas

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Those codes are low catalyst system efficiency which is what you would expect if you don't have cats on your ride...

Won't affect how the car runs so enjoy the blower!
 
OP
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1slow.s650

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Those codes are low catalyst system efficiency which is what you would expect if you don't have cats on your ride...

Won't affect how the car runs so enjoy the blower!
These are while the cats were still on.
 

GregO

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Well, as suspected the OEM Gen4 5.0 cats appear to be the same weak link as prior Gen’s
 

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GregO

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These are while the cats were still on.
So no VMP warranty claims by you or the installer. Their suggested solution was to smash out the catalytic bricks ?
Do you have visual emission inspection in your area ? Will removing or relocating the cats cause an emission inspection failure ?
 
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5PTWHOA

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You could leave the exhaust as is and try this product to see if it helps tame the smell. It is o2 sensor. It’s safe and works with all fuels, so you won’t have anything to lose. It may get a little costly (about $14 more per fill up though). It comes in a myriad of scents (pina colada, root beer, cherry and many more).

https://www.hyperracing.com/Power-P...2be5vLJyyHe2J2fxB1IeELAfi7ftBrDyie7ylZzq0t6DQ
I run this on a supercharged 2015 with ffe and no ill effects. Smells great
 

nnnnnn

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OP, I think what people are wanting to know is how when cat cel code came on, how you managed to get it to go away. What foulers are you referring to?
 

GregO

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I run this on a supercharged 2015 with ffe and no ill effects. Smells great
You want to save a bunch of money ?
IMG_5690.jpeg

Yup, fragrance oil’s. Those tiny bottles marketed to Motorsport guys are nothing more than fragrance oils marked up to 300% profit.
The two bottles pictured are $18.00 each @ 16oz. My mix ratio is .5oz per 3 gallons and my neighborhood smells like a Carnival when I’m running the chainsaw or backpack blower.
I used to use it trail riding until my buddies complained about craving cotton candy all the time. LOL Pipe tobacco screws with everyone !
 
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JoeCee

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2020+ gt500 cats or gesi gsport2 cats. Just scored a set of gt500 cats that were pulled with 30 miles for $600.
 

Cobra Jet

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So reading through all of this….

What I’m not getting is this:
Ford has authorized Dealers that can and do install the Whipples as a Dealer add-on, OR as seen on this site and through various other sites - such aftermarket S550/S650 Vendor versions like RTR, Roush, Steeda, Hennessy, etc etc etc…. And with that in mind - how is it the same Supercharger kit is used by those Companies (and Ford Dealers) - and they are still retaining the factory catback system with NO issues?

But DIYers and those kits installed by random “Mustang” or small “performance” shops using the same kits are somehow having catalytic converter failures or “blow outs”??

To me - and this is purely an assumption - but to me if the same kit is used by an Authorized Ford Dealer AND any aftermarket Vendor with the factory cats and they have no issues - then the problem has to be related to the “tune”. Am I right or wrong??

If there’s not a difference in the hardware being used whether a Dealer “authorized install” or DIYer, then the failure of the catalytics has to be due to poor or improper tuning.
 

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But DIYers and those kits installed by random “Mustang” or small “performance” shops using the same kits are somehow having catalytic converter failures or “blow outs”??
Some thread observations,
The VMP 2024 S650 kit;
Stage 1 3.875" 91-93 pulley 92mm TB
Stage 2 3.750" 91-93 pulley 112mm TB
Stage 3 3.750" 91-93 or 3.625" E30 112mm TB
Stage 4 3.750" 91-93 or 3.500” E30 120mm TB
OP states he has 3.625”
Stage 1 & 2 EPA CARB approved. Stage 3 & 4 Off Road only.
It appears the VMP system was pieced together ?
My guess, this started as a CARB EO Stage 2 kit, the Stage 3 E30 pulley added.
The big question, what tune was loaded ?
 
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JoeCee

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First , I’m assuming a canned whipple/roush tune retains cat overheat protection. A lot of tunable mustangs probably get it turned off? Secondly, I’ve heard of gen2/3roush calibrated cars having cat issues. I would think it could be because they are being beat on constantly, or as EngineerMike has stated dyno pulls with quick shutdown is a killer of the cats. Also these new s550 whipple are capable of higher boost…too high for cats period.
 

Cobra Jet

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First , I’m assuming a canned whipple/roush tune retains cat overheat protection. A lot of tunable mustangs probably get it turned off? Secondly, I’ve heard of gen2/3roush calibrated cars having cat issues. I would think it could be because they are being beat on constantly, or as EngineerMike has stated dyno pulls with quick shutdown is a killer of the cats. Also these new s550 whipple are capable of higher boost…too high for cats period.
But - to go back as I mentioned above - how are these Whipples being installed by Authorized Dealers and not running into such issues with the factory cats? We’re talking major players that are well known in the industry - and you don’t hear of such an install blowing, baking, melting, or destroying cats.

So the issue has to go back to either someone modifying the parameters (hardware or software) beyond the Manufacturer's recommended specs OR there are shops/tuners/DIYers causing the “meltdown”…

Ford Authorized Whipple installs or the larger Vendor Aftermarket installs aren’t pushing vehicles out of their bays that can (will) melt catalytic converters…. They’re not in it to have pissed off owners coming back with an application that will constantly cause cat failures.

As you stated; maybe there are or were some Roush cat failures - but were those failures on a Roush that was not touched at all by the owner (meaning the owner had not touched, modified, or tuned the vehicle hardware or software after purchase)?

I’ve been around Mustangs both stockers, factory modified, and of course those modified by DIYers or small performance shops for 30+ years now. Usually most failures where the catalytic converters were destroyed (melted) are always from in incorrect tune OR totally incorrect air/fuel ratios - not just the application of XYZ Supercharger.

I’m surprised at seeing some of the cat failures on this site because if the vehicle is properly tuned (PCM tune) and is running proper air/fuel ratios, it shouldn’t be melting cats even with higher horsepower applications.

If the car is a dedicated track car where it has exponentially high HP and is running dual turbos or massive boost via a Supercharger, then yes of course cats are eliminated and wouldn’t be a discussion point.

But when we’re talking a common Supercharger kit that is run on the street, the same installed by an Authorized Dealer or Vendor - designed to be used with a factory cat system - there shouldn’t be any catastrophic catalytic converter failures IF everything is operating within the parameters as designed.
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