Right people, was wondering today, how much power loss would there be if i/you had a car mapped with the CAT still on the car?? i,m reading threads and most people that seem to have the Miltek, map, Filter, etc get around 340-350bhp similar torque, so would you say about a 20bhp loss with CAT still fitted??

AND, surely the extra 20odd bhp wouldn,t be noticable, or would it??

Opinions please.......

 

It is noticable IMHO

Lose the cats lol and keep them aside for the mot!

 

why in hell would you map a car with the cat still fitted , the idea is to remove the cat so free up the exhaust flow for more bhp !!!

 

Lol,

I know this.. i was just wondering about MOT`s etc AND there,s a guy on here, CAN,T remember his username, he,s had his mapped with CAT still fitted and made 359bhp, mind you, what Dyno i don,t know....

So tell me this then, surely a SPORTS-CAT still has some restriction then, yes, no???

 

Pete, talk to David, he'll advise you.
by the way what was your last motor again?

 

It is worth mapping with the cat in place - can still get very good results.

.... just not as good as without them. Sure the top end power isnt much different but you would get slower spool up with the cat.

 

Why not change your downpipe for a sports cat downpipe then go catless from there - i think you should be alright at MOT with just the sports cat? I'm not %100 sure tho someone who's done it maybe need to backup up this statement

 

Pete,

I'm thinking along the same lines: https://www.scoobynet.com/scoobynet-...-question.html

 

I have had mine mapped with a sports cat and it made 352Bhp on zens dyno, i also had a decat pipe on it before and to be honest i couldn't tell the difference :|

 

Is your Litcho Spec C not remapped by Powerstation anyway ?

 

Mine's got an early TSL catted downpipe and is running around 360 bhp till the re-map....

DunxC

P.S. Much less bother, even if I do know a man who can

 

Are you asking me that fella??





Burns

My last car was a cossie, you know this ya tart...

 

My car (MY07 STi) was mapped by AndyF and has a TSL Pulse Extraction Exhaust, it made 360/380.

 

Never heard of that System...

Great numbers though.......

 

mine has a decat on just the downpipe and it has been remapped and passes emissions on every MOT. Maybe you could consider a partial decat so you don't have to worry about failing MOT time.

 

As long as they can play with the power band and improve areas, ie; pulls like a train in 5th and 6th from low down, then it might be worthwhile.

But lets be honest here Pete....just get them cats out and unlock the cars true potential!

 

I was yes but I see its a DH import.

I would get it mapped if it hasn't been done already. Lots to play with from a driveability point of view, and it will still have a healthy achievable BHP/Torque even with the cats in place. If it hasn't already just ditch the second cat

 

Guys, just to clarify I am getting the car mapped & de-catted, it was just a question i thought i,d ask to see if anyone has had it mapped with CAT fitted and what results they got...

 

ahhh...missed that tbh.

 

Jimmy,

What car have you then at the moment, Evo, or the Subaru??

 

See my car bit ...got an 8, but swapping to a 6 hopefully soon.

 

Pete,
As I have already advised lol, if you want to keep a cat than go for a 100cell sports cat. Anyone on here that suggests any real appreciable gains that can be made, against no cat at this level, I will be more than willing to step outside in to the boxing ring and sort out the man's way!

A well known rally team (but I am absolutely sure they have all tried) could not find any benefit from running with or without, in various guises and locations etc. If it's could enough for them (a high flow sports cat) it is good enough for me.

If the stress free thing of MOT is of prime concern, fit a sports cat. You will not lose anything like people image.... apart from some cash that is!

A sports CAT will be going on mine soon. As it is a road car, regardless of what power it porduces!

 

^

I know yours will be the 2.0 rather than the 2.5 but with a 2.5" system H&S 100 cell sports cat, second decat, straight through centre and STi BB I run 288hp/323ftlbs at the wheels.

I fitted these parts as I had them there to fit, but having had it done I haven't felt the need to decat further.

 

Im in the same dilema mate, let me know what you research & decide ultimately. Am I right in thinking the Spec C has just one cat in the downpipe? Also is it a 3" that then mates onto the 2.5" or 2.5" all the way through?

Because I would prefer to buy a twinscroll 3" downpipe (either sports cat or decat) that I could mate onto my existing 2.5" std exhaust. Then in the future it gives me the option if I want to change the remaining to full 3".

 

AFAIK 2.5" all the way through.

 

Thanks again Which 3" twin scroll type downpipe, (racing cats or decat), to attach onto our std 2.5" exhaust, would you recommend.

 

I can't see the point personally swapping part to 3" and then keeping the rest 2.5". You release one area with a free'er flowing pipe, only to restrict flow further on. Seems a bit **** about face to me.

 

Here's a link, it's the best system I have ever had.

TSL Pulse Extraction Exhaust System

 

In 911's thread in projects (Searching for the perfect chassis).. He tried a sportscat vs the usual decat. If a little wary of comparing a hugely modified Classic STI vs a newage Spec C but ISTR he made 345BHP with the sportscat and about 380BHP with the decat.

I don't recall the whole situation as to whether he had it mapped etc. between swapping the pipes over.

J.