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Removing Cat -will it improve performance/power help please
Topic Started: Sun Aug 22, 2010 3:22 am (4,822 Views)
tellurian
Newbie
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Hi folks new to your forum and needing some help please- i have a 1990 2.6 Sportline 190E.
I want to know the following please..any advice links or info experiences would be much appreciated.
Are the two enlarged sections of pipe on the exhaust [section 8 in pic where it hooks to the manifold], precatalytic converters?
Do they contain anything I can remove?.
Also if I remove my catalytic converter and replace with a resonator of the same shape and size and replace the O2 sensor will I get better performance/power and better fuel economy ?
I will be leaving the rest of the exhausts and mufflers stock standard.

I currently am running the car with a K&N air filter element (same size as original etc)
please note we dont have same emission laws here in New Zealand so no probs with legality ..purely a drive to have a bit more welly on tap and better fuel economy, which the K&N has provided in spades.
PS some damn nice mercs on here!
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NZ_190
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Part of things
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Hi sorry dont no the answer to this one but I also have a 2.6 and am also from nz =). Ill keep an eye on this see what people say. What sorta kms are you getting to a bout 20 buks of gas???
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MadMike
Therapy Needed
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Hi mate and welcome to the forum.

2.6 Sportline,very nice car. We would love to see some pictures of it.


Its pretty early here in the morning,some guys should be on later who should be able to help you.



Mike.
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alan
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hmmmm interesting
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welcome along i may be totally wrong but as i understand it, it may improve the power as the exhuast is less restrictive but may increase fuel consumption as well
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jeremy
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Too Far Gone To Help
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It will increase fuel consumption , only because you'll be using the extra performance now liberated .......

You do get a few hp ....


Jeremy
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190ian
190ian
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jeremy
Sun Aug 22, 2010 9:42 am
It will increase fuel consumption , only because you'll be using the extra performance now liberated .......

You do get a few hp ....


Jeremy
yes it will increase fuel consumption , it does make it a bit quicker, and a quicker responce from gear change
(mine is only a 1.8)
and louder exhaust sound

and the 2 enlarged bits at section 8 are pre cat
Edited by 190ian, Sun Aug 22, 2010 9:57 am.
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alogaparaloga
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crazy mind
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By helping exhaust gas to escape faster from the system the fuel ratio will become leaner.
So you will need to adjust the fuel to keep the AFR at around 14.7. That's the reason for consuming more fuel.
as for the power you will notice some low end torque loss especially when the car is loaded. On the other hand mid to high rpm will be improved.
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tellurian
Newbie
[ * ]
@NZ_190 yeah around town i get about 22 mpg ...on the open road about 30 mpg town driving its all the stop start idiots who cant figure out their brake from an accelerator and the morons who stop at roundabouts that dont help :)

ok I seem to be having two schools of thought here one says more grunt better acceleration but at the same time worse fuel use (well i suppose more HP your going to fang it some :)) )
@alogaparaloga...What does AFR stand for??
How do you adjust the fuel or is this only down via computer or agent with comp hook up etc??
would the O2 sensor ( which i will be leaving in a replica of the cat ) not adjust the fuel to compensate??

PS sorry for late replies i have been very sick and was in hospital for a week and have only just got back to work after a month off! so will post upi some pics when i get s nice day and the cars shiney :)

can anyone LINK me to any tech articles on this topic please ??
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jeremy
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Too Far Gone To Help
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Sorry to hear about your recent ill health , hope you are back to your fighting fitness soon .


Jeremy
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alogaparaloga
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tellurian
Tue Aug 31, 2010 10:59 am
@NZ_190 yeah around town i get about 22 mpg ...on the open road about 30 mpg town driving its all the stop start idiots who cant figure out their brake from an accelerator and the morons who stop at roundabouts that dont help :)

ok I seem to be having two schools of thought here one says more grunt better acceleration but at the same time worse fuel use (well i suppose more HP your going to fang it some :)) )
@alogaparaloga...What does AFR stand for??
How do you adjust the fuel or is this only down via computer or agent with comp hook up etc??
would the O2 sensor ( which i will be leaving in a replica of the cat ) not adjust the fuel to compensate??
AFR stands for Air Fuel Ratio.

As you remove the CAT from your car you make exhaust gas will have no restrictions and flow out easier than before.
That will have 2 effects.
1. on low engine revs, the cylinders will be emptied of burning fuel-air mixture faster and that results in reduced low end torque.
2.At higher revs where combustions are faster and the exhaust pipes are filled with gas there is less restricion so the gas speed is higher and that improves mid-to high end torque.

So according to the above cases in city driving you will see fuel consumption to increase as you drive in stop/go rhythms becauseyou will rev the engine a bit higher to get the car moving,
but for motorway driving you will see some improvement in consumption if you have not a heavy foot and some improvement in engine response.
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Mr.Speedy
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I don't know how much difference de-catting makes, as mine had already been knocked out when i bought it.
It is a fair bit quicker than a 2.0 carb model tho (ask grats. Lol) but found it a little too raspy with a straight through system and just a straight through powerflow back box, so i've just fitted a cherry bomb as a centre box in the position of where the cat used to be and is a much nicer sound
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balamb37
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Grumpy Old Grampa with Dog
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By removing the 'Cat' the HP will increase by approx. 5 to7 more.

And providing that you dont remove the Lamda sensor it will correct the AFM accordingly.

The only reason that some people experience more consumption is because the engine has 5-7 more HP

they tend to use it with a livelier usage of the throttle. ;)
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tellurian
Newbie
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thanks guys sorry about long reply time been ill :(
will have a look at all this with exhaust guy i use
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190ian
190ian
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balamb37
Tue Aug 31, 2010 7:36 pm
By removing the 'Cat' the HP will increase by approx. 5 to7 more.

And providing that you dont remove the Lamda sensor it will correct the AFM accordingly.

The only reason that some people experience more consumption is because the engine has 5-7 more HP

they tend to use it with a livelier usage of the throttle. ;)
you do seem to have your foot down more :D


my 1.8 no cat with just 1 stright through centre box with twin exit pipes
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but now has a cat back on :(

Edited by 190ian, Wed Oct 6, 2010 7:12 pm.
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