loztech

Hi. I've got a TSL decat downpipe to go on my Terzo (MY98) which has had PPP. Threads on here suggest a remap is needed afterwards. Can my ECU be remapped (standard STi ECU I'm assuming) or will I need to get a new one?

Steve

Tidgy

my98 i believe can be mapped, also you will get more performance from it than the ppp.

loztech

Cheers. Another question regarding this... will not remapping after decatting cause damage to the car in any way?

Steve

Gear Head

iTrader: (2)

My98's cannot be re-mapped. Some companies will be able to fit a piggy back board but it won't be specific to your car. You will need a stand alone ecu such as an Apexi Power FC.

Tidgy

i thought it was 97 that couldn't be mapped? or is it both?

Tidgy

right after consulting orrical,
if the coil pack is on centre of manifold it can't be mapped.
if its on right can be mapped using ecutek,
if there individual you'll need a scoobyecu.

think i got that down right, aparently its a bit of a minefield, best bet get spetialist to look at it.

loztech

Thanks for the reply. Bummer! I was hoping not to need a new ECU. Is it necessary to get a remap, or would I get away with not having one? Any issues with reliability at all? What I'm asking is, what are the reasons to remap?

Steve

Tidgy

changing the down pipe change's the back prssure on the turbo, allowing it to spool up faster, the down side of this is that it can mean the turbo starts pushing out to much pressure for the engine and you get overboost.
As i understand it the ecu has two boost cuts, soft cut and hard cut, soft cut is controlled by the ecu and will reduced pressure by itself and is no major effect other than a slight jolt, hard cut is a whole different ball game, a restrictor is added to a pipe that if the presure gets too high the ecu will back off all feeds to the engine, fuel and air, my old mcrae did this and its scared the **** out of me cos put me foot down it went, then slowed and dropped 500 rpm even woth foot planted, then went again, then slowed, like it was hitting a brick wall.
a simple ecu reset sorted this.

the ppp cosists of three things, a sports cat, uprated pannel filter and a remap (set up by prodrive but not specific to the individual car). by removing the cat the map, ppp, wil no longer be correct for the car. by restting ecu to origional settings, pre ppp, yo will find the ecu will learn the engine specs again and should sort itself out.

by remapping completely fresh you'll get the best performance from the engine and can be set up to run how you want it to in very basic terms, mine for example pops and bangs all over the place.

gains should be, 215bhp standard 215ftlb of torque (i think) ppp will be 240/240 full decat wil see near 260/260.

bear in mind though each car varies, mine for example runs 258bhp and 280ftlb of torque. yet another car with exactly same spec might get 250bhp and 250 ftlb.

loztech

Do you mean resetting the ECU here, or reverting it back to the original map?

Steve

Tidgy

resetting back to origional ecu, ppp was mapped with sports cat.

DIPSY

Ecutek is for 99onwards subarus .The 215bhp and 214torque is my99/00 classic years .The my98 208 and torque is the same as the my99/00

loztech

Thanks for you replies Tidgy.

Steve

DIPSY

The ppp on a classic .The downpipe is the same as any other impreza .The center and backbox are changed for a more freeflowing exhaust a panel filter intercooler hose and ecu for 99/00 .The new age impreza get a new sports downpipe cat well the sti does not the classic

Attu

Your mixing PPP's up a bit, Pre 99 had ECU, backbox and panel filter, 99 and 00 had ECU, backbox, middle box and blue intercooler hose.

Ive got a MY98 PPP that ive had for about 4 years and for the past 3 years its had a full decat, last weekend i put both cats back on the car and was amazed to find the car actualy feels quicker and smoother now the cats are back on.

Andy

StudentScooby

Now that is strange!