corsa120
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Registered: 4th May 02
Location: Northamptonshire
User status: Offline
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basicaly my 1.6 16v has 4branch/cat-back/filter, i have just booked it in to velos to have a torque-tube/unichip/arp bolts some head work the last mod im after is a decat pipe my question is once the engine is mapped with a decat when i come to MOT it i will have to put the cat back on will it affect the emissions test and the car in general as it will have been mapped to suit a decat cheez
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Wolf In Welsh Clothing
Member
Registered: 31st Mar 03
Location: North Wales...... Cooper S on order
User status: Offline
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I had my de-cat fitted after my unichip(and plenum).
Went back to velos and the unichip didn't need altering.
Just gave an extra 5bhp at the wheels without any raspy noise! (Janspeed mild steel)
Ul probably need to put ur cat back on for the MOT, unless you can find a friendly MOT station!
Not that im sujesting that you break the law!
I may know sum1 who can help you with raising ur rev limit if its after 97 (has to be 16 pin diagnostic plug).
Me mate is going on a traing course for programming ecu's soon.
With ARP bolts i was running 7250/7500rpm daily but ran 7500/7800rpm once without blowing it up.
Just never used to bounce off the limiter much in 1st (never in neutral), always used to hit it in 2nd (63mph), 3rd and 4th(115mph) though!
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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to be honest your car will prob still fail its MOT with the cat on...  just find a nice station
My silver sport passed 2 mot's over the limit.... one with no cat, 1 with a cat....
it was the idle test mine failed on  d/t cams
dont even think my 2.0 had a emmisions test... never had any scooshers, no horn - but got an MOT
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corsa120
Member
Registered: 4th May 02
Location: Northamptonshire
User status: Offline
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thanx ladz but niether of ya have really answered question i will have a cat on for every MOT just i wanna no does the unichip need altering every time u add/remove the cat for the MOT
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Andy
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Registered: 28th Dec 99
Location: Cumbria, UK
User status: Offline
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The Unichip can be 'switched off' ie instructed not to make any alterations to the standard map. So if you refit the CAT and switch the Unichip off, you should be OK. You'll need a laptop though to access the Unichip
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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or just find a nice MOT manny
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Wolf In Welsh Clothing
Member
Registered: 31st Mar 03
Location: North Wales...... Cooper S on order
User status: Offline
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quote:
Originally posted by Wolf In Welsh Clothing
I had my de-cat fitted after my unichip(and plenum).
Went back to velos and the unichip didn't need altering.
Unichip shouldn't need altering for cat or de-cat, mine didnt and spec wasnt that different to what yours will be.
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miles
Member
Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
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Why would anyone want to hit the rev limiter in neutral?
You should be fine. I passed my emmisions test.
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