De Cat Headers ??

[les049]

I know they'll probably be a thread somewhere on here about this but.........

De Cat Headers !! are they worth it, there are some on Fleabay at moment for about £180 new. The ad's say "increase bhp / fuel economy / increase your length" etc etc, but......are they a worth while mod..so fellow tossers whats your opinion(s).

(alright so they would'nt increase your length !)....

 

[Rasher]

Just fitted a set to my 2008, definately gives a bit of low-midrange boost, not done enough miles to tell if MPG is better but seeing as the cat is like jamming a spud down your exhaust I cannot see it being any worse.

They are a whopping kilogram lighter as well - it all helps.

 

[Sgt Bilco]

They will increase your bhp slightly and make the engine breathe better so it feels a bit more lively on the throttle.

You will feel it low down in the rev band and the increase in torque helps the bike pull better especially loaded. Also, the noise is a bit deeper and fruity.

I've never noticed an increase in mpg though.

Good mod

 

[forest biker]

They will increase your bhp slightly and make the engine breathe better so it feels a bit more lively on the throttle.

You will feel it low down in the rev band and the increase in torque helps the bike pull better especially loaded. Also, the noise is a bit deeper and fruity.

I've never noticed an increase in mpg though.

Good mod

+ 1 with sgt bilcos comments , what i would add though me personally i think it decreases engine breaking slightly

 

[Pukmeister]

They can also make an engine that runs lean as standard go a bit too lean unless some form of enrichment is added eg Power Commander. Caveat emptor.

 

[forest biker]

They can also make an engine that runs lean as standard go a bit too lean unless some form of enrichment is added eg Power Commander. Caveat emptor.

would a accelerator module help that as it puts more fuel through the system ??

 

[mirboo72]

headers are a good investment,today i rode to NOG round trip 150 miles first proper ride with the race headers averaging 47 mpg compared to 43-45. on a mix of roads..will know for sure on a full tank day out..

There wasn't a lot weight reduction with my headers. the end can was a lose of 4 KG when that was changed.
Highly recommend it.

 

[Pukmeister]

would a accelerator module help that as it puts more fuel through the system ??

The accelerator module is overruled on steady throttle by the lambda (oxygen) sensors, so your bike will run enriched initially during acceleration then the mixture will lean off.

I have acquired some open headers and a Power Commander, but they aren't yet fitted as my bike is still under warranty. I also use a K&N filter. No way would I run my bike with open headers and no Power Commander type device as I believe the engine could be placed under undue stress through lean running (hence my caveat emptor comment).

Several GS engines have failed through dropped exhaust valves, which are usually the first thing to fail in an over-lean engine.

 

[forest biker]

The accelerator module is overruled on steady throttle by the lambda (oxygen) sensors, so your bike will run enriched initially during acceleration then the mixture will lean off.

I have acquired some open headers and a Power Commander, but they aren't yet fitted as my bike is still under warranty. I also use a K&N filter. No way would I run my bike with open headers and no Power Commander type device as I believe the engine could be placed under undue stress through lean running (hence my caveat emptor comment).

Several GS engines have failed through dropped exhaust valves, which are usually the first thing to fail in an over-lean engine.

Thanks for answering my question pukmeister , ive alway used power commanders on my R1 and gsxr but never really thought about it on the gsa perhaps time to get one fitted then

 

[Nick dj]

Save money

I cut the BMW headers as a previous post had shown.
I took them to a local welder cost £20
It really is worthwhile pulls from far lower add an Apro end can which help save more weight and the bike is even better.
Where are you?- could get it done for you?
Nick

 

[les049]

Good Thought

Not bad option Nick, i saw the aforementioned post and was impressed by it. Did the bike run any richer / leaner after the mod ?

As for location I am reet darn sooth in Portsmouth, bit far from you in Suffolk I guess !

 

[Nick dj]

The fuel injection should be able to cope with the slight change in back pressure,I have`nt changed the air filter as I was told that I would need a power comander.
Will check this week to see if it is running weak and get back to you
It has been done for over 4k and no problems.
Yes suffolk but any welder can do it and will be glad of the work, just check they will weld with a stainless rod.
Nick

 

[Sgt Bilco]

You won't need a Power Commander on a GS unless you run with a full after market system with no baffles and a K&N filter. By the time you get there you've probably got the wrong bike

The Lamda sensors will sort the fuelling with decatted headers no problem

 

[Rasher]

You won't need a Power Commander on a GS unless you run with a full after market system with no baffles and a K&N filter. By the time you get there you've probably got the wrong bike

Nick Sanders will show you they way if performance adventurebiking is your thing.

 

[Pukmeister]

The Lamda sensors will sort the fuelling with decatted headers no problem

If the fuel curve compensation via Lambda is at 100% and your mixture is still too lean, you'll either find out via a rolling road power run with exhaust gas analysis, or by the sound your engine makes when it eats itself.

The smart thing to do is to pay for a power run on a dyno once the decatted headers are fitted (probably less than £50). If the mixture is too lean you'll need to invest in a PC3 or similar. Much better to be safe than sorry.

 

[Bikerjim]

I ran de cat headers on my GS for 15000 miles to and from work on a daily basis

The bike ran smother and faster with them as Rasher posted its like taking a potato out the pipe

Never had any problems with fueling It seemed better with de cat.

Only problems is the rear tyre takes a pounding if you give it a handfull

Im no expert but if the lambada sensor is in the cicuit before the cat then why would it change the fueling to lean ? how would it know ?

Jim

 

[Pukmeister]

Im no expert but if the lambada sensor is in the cicuit before the cat then why would it change the fueling to lean ? how would it know ?

Jim

The Lambda doesn't change the fuelling to become lean, the increase in flow through the engine (without any alteration to the fuel map) does.

The Lambda sensors are there to ensure complete combustion by measuring the amount of Oxygen in the exhaust gas. They trim a percentage of the pre-programmed fuel curve to make the engine run without over fuelling and damaging the catalytic converter, which itself is fitted to change the exhaust gasses into a cleaner form. The Lambda sensors are not fitted to control fuelling directly.

 

[(RIP) Proff]

Bugger

I thought it said

De CAT HERDERS >>


<iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/m_MaJDK3VNE" frameborder="0" allowfullscreen></iframe>

 

[ianran]

I cut the BMW headers as a previous post had shown.
I took them to a local welder cost £20
It really is worthwhile pulls from far lower add an Apro end can which help save more weight and the bike is even better.
Where are you?- could get it done for you?
Nick

Have you got a linky to that post?

 

[advancedbiker]

De Cat Headers - Sandy Bike Spares - E Bay

This has been a very interesting forum posting, but going back to the first post, has anyone tried the De Cat Headers from Sandy Bike Spares, only £179.99 post free. Seem too good to be be true, considering the price of the Remus version.

Thinking or getting some at that price, stainless steel aswell

Nigel