Had Silenced De-cat! MPG??

[Quid]

Had this fit about a month ago and MPG is down to 29 is this the norm?

Thanks in advance

Antony

 

[hipwell]

Mpg should increase with decat.

Your probably just driving it harder cos of the noise lol

 

[Quid]

Hi mate, I've been going quite steady to be honest. I know it requires mapping but I didn't expect such a drop in mpg

 

[aucky]

I've dropped about 3-4mpg it seems since my decat.

 

[Quid]

So it's not just me then? Thanks for your info

 

[Jamie]

Car runs richer, not sure how or why you'd get more mpg from that.

Mine dropper a similar amount to Aucky's.

 

[hipwell]

Mine went up. Not sure if that was due to the remap or not though as I did both at same time

 

[sideways danny]

there's a fair chance the lambda sensor was damaged when fitting the decat. They're quite delicate

 

[Quid]

Yeah you could be rite as my warning light hasn't come on. I know some do stay off, but it's a possibility.
Thanks danny

 

[Andyman]

They dont always come on straight away. Id a said lambda too. MPG should be the same if not slightly better

 

[ripp]

had a read recently and fitting a de-cat will decrease back-pressure which some will say it won't do good to power or torque. so do you really gain anything from fitting one? my cat exit towards the mid section is slightly damaged and I was thinking of either doing the 2,5" cat mod or to buy a de-cat
what do you reckon?
mpg wise I don't see why a de-cat should change that if the lambda's are ok

 

[Dblock]

I had a ktec stealth and silenced decat and my mpg went up by 3mpg. I did use the rstuner to put a newer .cal on it though.

 

[Quid]

well i looked further into this and i have recently gone for the ph1 airbox setup, but the airbox only had two clips and i thought this was ok. anyway i took it off and the box wasnt that tight so i 'adapted' some tie wraps to close the box up as it shoud be. i did this in the morning and the journey from work to home it has gone from 29 to 30. ok i no its only 1 mpg but its a start ha ha.

As for gains i can tell it pulls better mid range and throttle response is much better. i wasnt expecting any thing major in regards to gains, but my future plans are matched inlets and a nice remap from paul at RS tuning.

thanks
Antony