classicaaron

just wondering why a remap is a must on a vehicle if it gets a decat system?iv read many posts on the impreza that it will damage the engine if its not remapped after a decat fitted? where is the evidence of this?iv had many cars in the past and put a decat on nearly all of them never had any problems and engine always went as it should.appreciate the inputs from members.cheers friends.

veerinder9

iTrader: (1)

My uk turbo v6 came with a induction kit n decat, wasnt mapped n was driven hard, also santa pod'd, no issues whatsoever..

classicaaron

my both mates also got the classic model both got decats and not been mapped the 1 has had a decat for 5 years the other for nearly 2 years never had a days trouble with either of them.would like to hear the views of other members or mechanics also please.

JDM_Stig

iTrader: (3)

depends on year of car tbh too

classicaaron

my 1 mate got a 95 sti ra been going 5 years no problem with full decat system without remap other mate got 1998 uk model turbo'd impreza been going 2 years decatted straight through without remap.

scc28

iTrader: (1)

i think its alot to do with age of the car. i was told going decat on my 2.5 i would need a remap. i was told that by my mapper and i really dont have a reason to question his knowledge.

yabbadoo4

iTrader: (8)

i think people say its safer to have it mapped, not essential. also the mapper can adjust afr etc to maximise the gain from the free flowing exhaust. at the end of the day its your engine. my wagon is mapped and im going for full decat with ported headers and up pipe after my mot and i will def have the map tweeked to suit.

scc28

iTrader: (1)

as Yabbadoo says, for the cost of modifying a map is it worth a £3k rebuild cost. I always go safe rather than sorry. i think the timing can be advanced quite a bit due to increased flow