Decat question

[budaholic]

I've decided to decat my 4.5 cerbera.
After fitting bypass pipes, is there anything else that has to be done? Or is it just a matter of cats out, pipes in?
I'm not sure whether ECU mapping or lambda sensors are affected!

Budaholic (Mark)

[SXS]

Naa, should be fine - but the reports have varied, some feel better performance, some feel its more lumpy, some dont notice a difference at all - apart from the noise - which then leaves the last group = some go back to cats - less of a headache! hehe

[TVR Slag's Bil]

When Fluff was decatted she was taken to Guglielmi motorsport to have the ECU and mapping, checked with the pots as well. This is because it changes the back pressure of the exhaust system.

However, not sure if they changed anything!

[SXS]

From my understanding, the current units done make much of a difference to the back-pressure, the existing 2-1 2-1 skinny headers create most of the back pressure.... maybe they changed their designs over the years of the headers?

[budaholic]

Thx, ordered pair bypass pipes from Mark at Tower View Race Services. Hope not too long before he gets them for me.

[joospeed]

[quote=SXS ]From my understanding, the current units done make much of a difference to the back-pressure, the existing 2-1 2-1 skinny headers create most of the back pressure.... maybe they changed their designs over the years of the headers?[/quote]

no ur right Ash .. the decats do nothing for power, but release more noise

[trooper1212]

joospeed said:

no ur right Ash .. the decats do nothing for power, but release more noise

Speaking of which, have you posted me a set yet Joolz

[joospeed]

er yeah, you not got them yet? don't tell me another thing has got lost .. effing delivery services, spend more time and money on the fone chasing up bloody lost parcels than the parcel is worth in the first place .. FFS!

joo

[trooper1212]

joospeed said:

er yeah, you not got them yet? don't tell me another thing has got lost .. effing delivery services, spend more time and money on the fone chasing up bloody lost parcels than the parcel is worth in the first place .. FFS! joo

Not yet, hopefully they will turn up this week.

[rjben]

Joo,

How much are your decat pipes (not fitted)?

Cheers,

Rob

[arcbeer]

I went the de-cat route. No regrets at all. Just pipes to swap them out, that's it.

Probably worth having a tune-up anyway as the throttle pots invariably need tweaking.

[joospeed]

rjben said:

Joo, How much are your decat pipes (not fitted)? Cheers, Rob

95.50 a pair plus vat and carriage

[rjben]

Ta very much Joo!

Rob

[Julian64]

so then rob, are you going to go for it?

[rjben]

Hi Julian,

Well it did occur to me to remove my cats, which appear to be working as normal (i.e. passed the MOT) and replace with decat pipes. That way I can keep a good set of cats and always be sure to pass my MOT in future! Does that make any sense?

I'm not sure I could deal with the noise though. Does anybody have experience of decat pipes with a standard back box?

[big g]

Yes, I have standard back silencer and de-cat pipes. Below 3K revs it is not to much noisier, as the revs build the sound is awesome. The pop and bang on the overrun is more pronounced but easily controlled...just bang it down a gear for more ;-)
Flames are the added bonus.
I use the car for 40 miles a day every day including motorway and I won't be going back.
Graham

[rjben]

Cheers,

Strangely enough I’d actually prefer more exhaust volume below 2000rpm, something to actually drown out the horrible noise the AJP8 makes at tick over! Also, not much louder than normal after 2000rpm. I doubt very much that this is possible though.


Thanks for the info,

Cheers,

Rob

[SXS]

Custom headers, and a pair of 3"'ers to the back with small resonators will produce a harmonious F1 sound thanks to the flat-plane crank...

Wont cost much:

Custom headers depending on quality - from £600 to 3k
Custom 3" piping and brackets and decat pipes - from £500 to 2k
SLP type resonators - around £200 each

and there you have it, for the budget concious - you can get a system built for around £1600 + labour

or for the performer purists - anything from 3k upwards...

you'll be wandering why you never did it earlier - thats how gobsmacking the sound and sensation will be when you first hear her fire up!...

The way I see it, if you can spend £1500 on a sofa or something - you can spend 1500 on your car! which you probably get more enjoyment out of anyway...

[trooper1212]

SXS said:

The way I see it, if you can spend £1500 on a sofa or something - you can spend 1500 on your car! which you probably get more enjoyment out of anyway...

You haven't seen my sofa

[budaholic]

SXS said:

and there you have it, for the budget concious - you can get a system built for around £1600 + labour or for the performer purists - anything from 3k upwards...

It took me a long time to accumalate enough points with the missus to buy my cerb. Bit of budget I have left is to sort any probs that may arise. (fingers crossed)
Upgrades of that calibre will have to wait a very long time.

I'll just stick with the decat for now and a few cosmetic bits to tidy her up.

Budaholic