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Author unichip does it???
corsa120
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Registered: 4th May 02
Location: Northamptonshire
User status: Offline
10th Jan 04 at 18:20   View User's Profile U2U Member Reply With Quote

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
Wolf In Welsh Clothing
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Registered: 31st Mar 03
Location: North Wales...... Cooper S on order
User status: Offline
10th Jan 04 at 18:58   View User's Profile U2U Member Reply With Quote

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!
AK
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Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
10th Jan 04 at 19:41   View User's Profile U2U Member Reply With Quote

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
corsa120
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Registered: 4th May 02
Location: Northamptonshire
User status: Offline
10th Jan 04 at 23:26   View User's Profile U2U Member Reply With Quote

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
Andy
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Registered: 28th Dec 99
Location: Cumbria, UK
User status: Offline
11th Jan 04 at 00:20   View User's Profile U2U Member Reply With Quote

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
AK
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Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
11th Jan 04 at 00:23   View User's Profile U2U Member Reply With Quote

or just find a nice MOT manny
Wolf In Welsh Clothing
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Registered: 31st Mar 03
Location: North Wales...... Cooper S on order
User status: Offline
11th Jan 04 at 15:03   View User's Profile U2U Member Reply With Quote

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.
miles
Member

Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
11th Jan 04 at 16:47   View User's Profile U2U Member Reply With Quote

Why would anyone want to hit the rev limiter in neutral?

You should be fine. I passed my emmisions test.

 
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