Jump to content
SAU Community

Recommended Posts

Hey,

Is it normal practise for a tuner to melt your hi flow cat, then when it doesnt flow, to punch if out so its no longer a cat?

Obviously if the high flow cat melted, it wasn't much of a high flow.

:) cheers :)

Link to comment
https://www.sau.com.au/forums/topic/93264-melted-cat/#findComment-1682699
Share on other sites

Hey,

Is it normal practise for a tuner to melt your hi flow cat, then when it doesnt flow, to punch if out so its no longer a cat?

If the tuner punched out the cat, then I suggest you get him to replace it (or maybe punch him out!).
Link to comment
https://www.sau.com.au/forums/topic/93264-melted-cat/#findComment-1683638
Share on other sites

Thats dodgy pratice for a mechanic to be doing that sort of thing. He could be up for massive fines, and more likely to be on the receiving end of the fine than joe public.

Cat shouldn't melt.. must have some massive heat (...more so than standard) coming down your exhaust, which could be a cause for alarm

Link to comment
https://www.sau.com.au/forums/topic/93264-melted-cat/#findComment-1683924
Share on other sites

People DO get fines for this. I know of a $3200 fine. happend to someone i know at small car sunday one year. The police were there inspecting cars. All they were checking was ride height and exhausts. they let everyone off with a warning except for those with environmental issues.

I think there were 3 cars fined in total and one was for no catalytic converter.

BE WARNED!!!!

There is a guy on these forums called BATMBL and he sells very good quality cats for a good price.

Check to see if your O2 sensor is connected. and if so you shouldnt be melting cats. I would have the AFRs checked if a hack has tuned it. Take it to somewhere reputable and for $50 they should do a power run to check AFRs.

goodluck and replace that cat ASAP :P

Link to comment
https://www.sau.com.au/forums/topic/93264-melted-cat/#findComment-1683980
Share on other sites

it is not uncommon for your cat to melt if your tuner likes to tune your car to be a bit on the safe side

this is like 11:1 under power or richer with a not so agressive ignition curve

this is good because it stops you popping your engine but it also causes a bit more heat and unburnt fuel which is what kills your cat

the only time iv ever heard of people getting fines for not having a cat is when they replace it with a straight pipe

if it looks like its there than what are they going to do....take it off on the side of the road to prove you havnt punched it

id like to see that

the only way they could catch you is if they do an emissions test and even if you fail that and they discover you have a puched cat,your not a mechanic and you didnt know that you didnt have a working cat

you will be right dont let these guys scare you

Link to comment
https://www.sau.com.au/forums/topic/93264-melted-cat/#findComment-1684254
Share on other sites

it is not uncommon for your cat to melt if your tuner likes to tune your car to be a bit on the safe side

this is like 11:1 under power or richer with a not so agressive ignition curve

i thought tuners liked to take out fuel and add ignition over stock settings to increase power, given that stock ecus run rich and retarded. if not, my stocker should've turned the cat into a molten lump by now?

Edited by GTR32
Link to comment
https://www.sau.com.au/forums/topic/93264-melted-cat/#findComment-1685396
Share on other sites

i thought tuners liked to take out fuel and add ignition over stock settings to increase power, given that stock ecus run rich and retarded. if not, my stocker should've turned the cat into a molten lump by now?

the rich/retard safety feature on the standard ecu is much richer than 11:1

and im not saying it will melt the cat down straight away, it could take week or months

its just one of those things

depends how old and what quality your cat is

excess heat and fuel will kill a cat in the end

Link to comment
https://www.sau.com.au/forums/topic/93264-melted-cat/#findComment-1687555
Share on other sites

Isnt more heat produced when your car is running lean?

If the mechanic wrecked ur cat and then removed it, i would be asking for it to be replaced free of charge. Especially if they didnt ask you first.

Link to comment
https://www.sau.com.au/forums/topic/93264-melted-cat/#findComment-1688402
Share on other sites

Running richer results in more unburnt fuel.

This fuel travels out of the turbo, down the pipe and collects in the cat.

Cat get really hot and this temperature causes the fuel to ignite inside the cat. This furthur increases the temperature causing a positive feedback mechanism inside the cat...

Link to comment
https://www.sau.com.au/forums/topic/93264-melted-cat/#findComment-1688473
Share on other sites

Modern ecu's have cat overtemp protection on them which means once they exceed a preset value the mixtures are richened as in really rich a standard GENIII will command between 11.0-11.2 for cat overtemp. There fore a leaner mixture will kill your cat quicker then a richer mixture. The thing to watch is how retarded the timing is.

Thing is shit happens, get over it and move on. Yes he should have told you before bashing it out. He really should have just removed it and run the car to make sure the cat had broken up. Anyways when your modify your car you should expect some small things to go wrong.

Link to comment
https://www.sau.com.au/forums/topic/93264-melted-cat/#findComment-1688601
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • After @Kinkstaah debacle, I'd never want to try and get it right 😛
    • The hood lines up with the fenders. The front bar doesn't perfectly line up with the fenders where the wheel arch is. You have to 'squeeze' the front bar 'in' as it wants to naturally flare out and be longer on the sides. There's a few threads where people notice this when they only swap a GTR style bumper and front bar. Unless you have genuine OEM items - you may be better served getting conversion kits. There are GTT bumpers to fit GTR hoods. There are GTR hoods (non genuine) to fit the GTT bracketry. MAY  
    • The real question is, on some of those wild roads they call highways, how many times did a farmer in an old ute from the early 2000s blaze past you over double lines?   Tassie is a wild and really cool place, and after doing a work related road trip there January of 24, I understand why Targa Tasmania is ran there, and is so tough to do well at! We had a brand new Camry Hybrid that handled quite nicely, and thankfully weren't in an old car, because cresting some of those hills in a 100kmh zone for it to suddenly be like "surprise f**kers, this is a recommended 30kmh hard right turn" wouldn't be pretty. We weren't racing the Camry around, but we weren't slouching in the bends either. But my lord those old farmers know their old clapped out utes, and those roads, as they were absolutely hammering it!   You're also super lucky to make it up to Mt Wellingtong this time of year. It's often road closed with snow/ice! Also, I hope you hit up Salamander Road in Hobart for some insanely good food (I highly recommend the dimly lit Irish pub for a Guiness Pie, or even the bangers and mash!!!)   How long did the Ferry take to get across? I want to do a road trip of Tas on my own time, but I get horrifically sea sick, and I don't want me on the Ferry, just the car 😛
    • So far so good, about 30km on it so far and nothing out of sorts yet thankfully
    • Look at @Kinkstaah's thread on the issue.
×
×
  • Create New...