late turbo decat?

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Rachel
480 Is my middle name
Posts: 1567
Joined: Thu Feb 09, 2006 2:21 pm
Location: Bucks

late turbo decat?

Post by Rachel » Sat Sep 30, 2017 7:59 pm

Hello,

I understand a late 480 T requires a cat to pass an mot, but just out of curiosity what would the actual difference be without running a cat? Noticable??

Many thanks
'95 Storm Grey 323 Manual Turbo, Richmod
----------------------------------------------------------
'95 Flame Red Celeb, Nos.191, 2 litre, LPG, used to be Adams ;) SOLD
'95 Vase Green Turbo~ Vanessa~ 'Serendipity' manual, Richmod. RIP
'90 Light Blue 480 Turbo auto....RIP
'68 VW Type 3 1.6 auto Lotus White,Swedish import. SOLD
Audi 80 coupe Gold...pimp my ride! RIP
'76 Bug, Ocean Blue, lowered, Empi wheels.RIP
'72 Bay window VW Camper 1600 twinport. Sold

jifflemon
480 Is my middle name
Posts: 2464
Joined: Sat Dec 17, 2016 11:03 am

Re: late turbo decat?

Post by jifflemon » Sun Oct 01, 2017 3:31 pm

Been having the same thoughts myself, particularly after getting the ecu done!

My thinking is that the cat is expensive; better having it being used once a year and run a decat the rest!
It may not give any improvements, but it can’t make it worse!

Robou
Knows an Aerodeck isn't a 480
Posts: 270
Joined: Sun Jul 08, 2007 11:34 pm

Re: late turbo decat?

Post by Robou » Sun Oct 01, 2017 8:49 pm

Without cat the exhaust gases meet less resistance so the flow has more speed and this benefits in general the behaviour of the engine. Whether a few hp's are noticable is the question.
When "the ecu has been done" it is a little different. Because the turbo gains more speed at low revs thanks to the speedier airflow the resulting higher torque, combined with some adjustments, makes the car run smoother at low revs/high gear.
Too old to bother
480 Turbo midst '91

Rachel
480 Is my middle name
Posts: 1567
Joined: Thu Feb 09, 2006 2:21 pm
Location: Bucks

Re: late turbo decat?

Post by Rachel » Mon Oct 02, 2017 11:36 am

Thank you Robou, yes, mine has a richmod. I like very much do to without the cat, just thinking of options.
'95 Storm Grey 323 Manual Turbo, Richmod
----------------------------------------------------------
'95 Flame Red Celeb, Nos.191, 2 litre, LPG, used to be Adams ;) SOLD
'95 Vase Green Turbo~ Vanessa~ 'Serendipity' manual, Richmod. RIP
'90 Light Blue 480 Turbo auto....RIP
'68 VW Type 3 1.6 auto Lotus White,Swedish import. SOLD
Audi 80 coupe Gold...pimp my ride! RIP
'76 Bug, Ocean Blue, lowered, Empi wheels.RIP
'72 Bay window VW Camper 1600 twinport. Sold

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