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Re:Higher RPM upgrades?

01 Dec 2022 17:52 #246188 by mlines
Replied by mlines on topic Re:Re:Higher RPM upgrades?
Fit a high flow cat?

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2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses

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01 Dec 2022 18:04 #246190 by Vandoni
Replied by Vandoni on topic Re:Re:Higher RPM upgrades?
I could but wouldn't a straight pipe be better for airflow?
I could get a 100 cell cat but that would still block flow a bit wouldn't it?

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01 Dec 2022 18:10 #246191 by DrRobin
Replied by DrRobin on topic Re:Higher RPM upgrades?
It's only the second O2 sensor that is the problem, you still need your first sensor.

If your de-CAT exhaust has a hole for the second O2 sensor (it might not) then
- fit it with an adaptor so it is away from the gas, then it will give a suitable reading to the ECU; or
- fit a dummy (de-CAT) fooler sensor, about 20 Euro

Will you get a CEL?
Not sure if the Jimny will give a CEL for a second O2 sensor missing, it will give an error code, but might not light the CEL, it depends on the year, which market the Jimny was made for and what the regulations in force at the time.

Will a CEL be a problem?
It won't stop the engine from running correctly or go in to a safe mode for an O2 sensor fault. However, the CEL on all of the time will be a right pain, plus if another [more serious] fault occurs you won't know.

It might also fail your equivalent of the [UK] MOT.

Will I have 2 O2 sensors?
Depending on your model, you might only have a pre-CAT O2 sensor, in that case you don't have a problem.

Finally from 4x4community.co.za they say
With all de-cats the white wire from the engine side must be earthed. This should solve the cat light coming on.

Not sure if this actually works.

It might be worth starting a new thread on here, say 'How do I de-CAT my Gen3 Jimny?' I am sure someone will have done it and know what you need to do.


2011 Blue Jimny SZ3, Hankook Dynapro/Maxxis Worm-Drive, BB Classics BB6 Sports Seats, Radius Arm protectors, Android Head, DAB, 360 Camera, TPMS, K&N, Bosch Aerotwin, boot light, parcel shelf, boot box, dash box, Osram Nightbreakers, CTEK Battery Sense, Front & Rear Recovery points, CB Radio.
The following user(s) said Thank You: Vandoni

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01 Dec 2022 20:17 #246194 by Vandoni
Replied by Vandoni on topic Re:Higher RPM upgrades?
alright i'll start the new thread and see what i can find, thanks for all the useful info!

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