93WRX with Z4 ecu and 3" decat - remap?
#1
Scooby Regular
Thread Starter
93WRX with Z4 ecu and 3" decat - remap?
Apologies for what must be the 1000th question on the subject - I've searched but can't find an answer for the exact combination of Z4 + 3" decat.
Having fitted an STI Z4 ecu and full 3" decat to my 1993 WRX I've decided to leave the power as is, and just enjoy it as a fun, capable road car.
The car is otherwise original - even down to the 112mph limiter. I've been watching the boost gauge and it only overboosts very slightly (1-1.5psi) in 5th. But, given the speed limiter and my awareness of the issue, it rares sees WOT in 5th for more than a few seconds.
It never bangs, except for the odd bang when changing 2nd-3rd at 3.5-4k rpm pulling away after a good run (I think due to momentary overfuelling 'thanks' to the dump valve which I'm replacing with a standard recirc). This worries me - should it not be popping more if the fuelling was safe?
Next on the shopping list is a wideband AFR gauge and (maybe) a 190lph fuel pump for piece of mind.
So, the age-old question: am I safe to use it without a remap?
I'm reluctant to cross that bridge, because then I 'may as well' get a FMIC/FPR/440cc/etc. and suddenly the c.£650 remap costs a lot more!
Thanks in advance!
Having fitted an STI Z4 ecu and full 3" decat to my 1993 WRX I've decided to leave the power as is, and just enjoy it as a fun, capable road car.
The car is otherwise original - even down to the 112mph limiter. I've been watching the boost gauge and it only overboosts very slightly (1-1.5psi) in 5th. But, given the speed limiter and my awareness of the issue, it rares sees WOT in 5th for more than a few seconds.
It never bangs, except for the odd bang when changing 2nd-3rd at 3.5-4k rpm pulling away after a good run (I think due to momentary overfuelling 'thanks' to the dump valve which I'm replacing with a standard recirc). This worries me - should it not be popping more if the fuelling was safe?
Next on the shopping list is a wideband AFR gauge and (maybe) a 190lph fuel pump for piece of mind.
So, the age-old question: am I safe to use it without a remap?
I'm reluctant to cross that bridge, because then I 'may as well' get a FMIC/FPR/440cc/etc. and suddenly the c.£650 remap costs a lot more!
Thanks in advance!