Ariel.Club Forum

by **Rooney1000** » Tue Aug 02, 2022 6:10 pm

Funny that you had this problem. I had same issue last year, although not limited to 3500rpm but once I got to 80mph it would take about 30 seconds more to get to 90 !

My cat was shot to pieces but here the story carries on. Got a new cat from Ariel and installed, all fine and car working well. That was as last summer. And then, just yesterday, on track day at Snetterton and after just 5 laps out the same loss of power ! Took the cat off and guess what, same problem, all messed up.

Spoke with Ariel who agree it is odd and suggested investigating further when next at the factory (fuel / injectors). Like you mine runs fine with bespoke decat now

by **John Scherrer** » Tue Aug 02, 2022 12:56 pm

by **Sir Nick** » Tue Aug 02, 2022 10:21 am

Yes Bod has it.

by **Sir Nick** » Tue Aug 02, 2022 10:19 am

I don't think we three have it...I'll message Bod and ask him.

by **John Scherrer** » Tue Aug 02, 2022 10:08 am

There was a Club members CAT last seen with Alex BS back in 2019. Bod was asking where it was in 2021 - don’t know if he found it.

Alex may have handed it over to one of the committee members as he sold his car.

by **Mrlizard** » Tue Aug 02, 2022 8:26 am

there was a forum cat for the 3.5/3 right? is that still about?

by **John Scherrer** » Mon Aug 01, 2022 11:16 pm

Don’t forget you will need to refit one for the MOT !

by **Badger** » Mon Aug 01, 2022 9:12 pm

To conclude:
The car has ran faultlessly since fitting the straight-pipe.
Impossible to say if there has been any increase in power/throttle response and so on, and I find it unlikey anyone would notice a decat is now fitted unless they were competing against the clock continuously and shaving 10ths of seconds away. After one day out in the car it's now the same colour as the rest of the exhaust system.
No remap required at all, no faults stored or pending (via obd port diagnostics).

by **JT1020** » Sat Jul 16, 2022 6:48 pm

. Thanks for the confirmation

by **speedmachine** » Fri Jul 15, 2022 8:21 pm

JT1020 wrote: ↑Fri Jul 15, 2022 7:39 pm Good find! Does anyone know if you or have to map the car if you are changing to/from cat to decat pipe? Or vice versa…

Thanks

No on the pre 4 cars its not, just fit and forget

by **JT1020** » Fri Jul 15, 2022 7:39 pm

Good find! Does anyone know if you or have to map the car if you are changing to/from cat to decat pipe? Or vice versa…

Thanks

by **John Scherrer** » Fri Jul 15, 2022 3:41 pm

Good find !

Considering the state of the CAT, I suspect 'solid' wasn't the best description Nick

by **Sir Nick** » Fri Jul 15, 2022 2:35 pm

Well at least you found something solid.

by **Badger** » Fri Jul 15, 2022 1:58 pm

Thanks for the replies I appreciate it.

I've removed the plugs and checked these (gap and condition is correct/clean).
I've removed lambda sensor and cleaned the soot off it and condition seems fine.
'Checked all wiring in proximity to heat and have continuity along the harness with no evidence of fatigue or melt.
I also lost some skin from my knuckles getting to the obd port but was pleased to see there were no faults stored/logged. what a pain that is unless you have hands the size of a three year old.

After checking the above I noticed from cold and with progressive acceleration the car runs okay, but at full throttle it stutters so I then expected to (possibly) find a restriction with air in/exhaust gases out. I removed the catalyst and it's totally shot so I guess I must have put too much heat through it yesterday in my excitement (2-3 warm up laps and cool-downs for both car and tyres has been my mantra for years and works for me). Maybe I should've put less laps in for each session, who knows (I'm not the cars first owner).

I suppose the 'downside' is I'll have to fit a decat now. Oh no :-D

by **Sir Nick** » Fri Jul 15, 2022 8:04 am

I seem to recall that the ECU limits revs if its not getting a speed sensor reading

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Rev's restricted to 3500? Power loss.

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