The science behind going completely catless without tune

[Spuds]

Originally Posted by steve99

Driving with the mil\cel on will mask any other engine issues so not a good idea

In case necro-OP was wondering, ^this guy^ knows his stuff.

[Ultramaroon]

Originally Posted by Trueweltall

Honestly it's not bad at all, you never notice it until you park it in the garage, sit at a drive through, or you know stand behind it while it's running.

Nope. If I'm rolling behind any one of my catless friends it's very noticeable. Three or more and it's just like being at the races.

I don't know how old you are but the bad ol' days weren't that long ago. I have lived through the dramatic improvement in air quality since tougher emissions standards have driven the changes.

I'm not judging but let's not fool ourselves. The benefits are real. If and when I do play with a header & tune, in keeping with the spirit of the exercise, I plan on moving the secondary O2 sensor behind the stock cat so I'll know if it quits working. That's science.

[Trueweltall]

Of course you would notice it if you're behind a car without a cat, I assumed you were talking about being the one driving it and if you notice it then. Oops.

[Ultramaroon]

Originally Posted by Trueweltall

Of course you would notice it if you're behind a car without a cat, I assumed you were talking about being the one driving it and if you notice it then. Oops.

lol...

[Bkdshadow]

Haha geez I’m going through so much “should I, should I not” in my head. But yeah I’ll take good ol Steve’s word for it then. It’s cool to see people actually reply to me on these forums, no one did on the Lexus forums hahaha. Thanks a lot again guys! Sounds like OFT is the mandatory first upgrade then 👍🏽


Sent from my iPhone using Tapatalk

[Tokay444]

You misspelled ECUTEK.

[guybo]

Originally Posted by steve99

Im just saying their is no 5% hard limit in ecu like those guys seem to be suggesting

I didn't quote the whole thing. It was in context of tuning. I just snipped out that part about doing bolt ons and not tuning. The article is in 2 parts- no tuning with intake only and tuning with Ecutec +intake.