Diesel_DC

iTrader: (7)

Just picked up an 02 sti with PPP, looking to decat it, what I need to know is will I need a remap, will the PPP ecu learn the new mods.

Basically I had a 96UK car with PPP. decatted it and never remapped. I never got any cel lights come on and had no problems with the car for best part of a year, so am confused if remap is required straight away

hoskib

iTrader: (1)

no point mate, the decat will give you such a small increase over the sports cat it's not worth the headache come MOT time. have a search on here, it's a top piece if kit.

if you do go for it though, i would guess it'll throw up the CEL light though.

Scooby Dan

I decatted my old 02 STI PPP and while it gained about 20 bhp it developed a few flat spots throughout the rev range. I eventually fitted some headers and had the car remapped and the improvement was massive. Richard Bulmer checked the car out before he mapped it and said that the car was running pretty safely but just wasn't making anywhere near its potential power.
My decat never caused the cel to come on but unless you are planning a remap I wouldn't bother with the decat as the ppp cat is pretty good

Diesel_DC

iTrader: (7)

Anyone else got a view on this?

T5NYW

iTrader: (4)

IIRC On 02 STis after a decat it could go far worse due to boost spikes. without remap they had to fit different size restrictors in the boost pipework.

Scooby Dan says

Tony

anthscooby01

Very little difference between sports cat and decat. Would think u could get away without remap but obviously a remap would give u better bhp regardless. PPP map is generic and not optimised.

MikeWood

PPP may not be optimised to a particular car but there's more variation due to the weather than the tolerances between individual cars (if they have the same mechanical spec). A car mapped on a particular day may work really well that day and give a better result but has it been tested in all the other temperature conditions, atmospheric pressure and humidity that the car is likely to experience in it's life? Not possible in the time frame that one customer can afford to pay for.

We actually found a small loss with a decat compared to our downpipe in our early testing, probably down to the volume in the downpipe that the gasses can expand into with properly designed inlet and outlet cones and a low density cat.

Regards

Mike

Midlife......

iTrader: (2)

As Tony says there were issues with boost spikes when decatting the Bugeye Sti, not always solved by drilling out or fitting different restrictors in the pipework so remap me thinks

Shaun

Diesel_DC

iTrader: (7)

Cheers for the comments guys