mattdoyle

As above, ran my 2005 wagon with a decat for 18months and it was fine, have a recently bought a 03 sti and have now got a 3" decat, have plans to have it remapped soon(got work on another car to do first).
Am i better waiting or should I just put it on, I f I take it easy until remap time I should be ok shouldnt I.

regards

Matt

eggy790

iTrader: (20)

drive off boost till its mapped, as for your old wagon for 18 months, did it overboost? as my mates wagon does that and hes ran it like that for a year.. i assume the overboosting preserved the engine as it was backing off..

dynamix

iTrader: (3)

Dont decat without remapping - the turbo on the STi will just want to spool and you will get horrendous boost spikes. At best this will feel cr@p, at worst it could be VERY destructive. Fit the day before the remap

petethemeat

iTrader: (6)

sorry to hijack,

but does this apply to classics too?

Thanks

turbo200chris

sorry to butt in, but with the decat, would i have to remap wen i got a downpipe bk decat system on classic? so its still got the downpipe cat just not the centre one?! and with remapping, will a 95 wrx ecu thats remapped fit my 97 v4 uk turbo? thanks, chris

TonyBurns

iTrader: (3)

Any STI doesnt like being decatted without a remap, especially the later classics (5's and 6's) and the new age cars.
Turbo 2000's are safer, then your imports are a little less safe, best to fit a knocklink on classics to see whats happening

To the OP, definately dont rag the car, it will cause destructive damage to the engine

Tony

TonyBurns

iTrader: (3)

Chris, your car isnt a version 4, your car is an MY97 uk turbo, only classic STI's have versions, 1994 (model year) was the original version, this has no number, 1996 (they missed a year) is a v2, 1997 is a v3, 1998 is a v4, 1999 is a v5, 2000 is a v6.
As you can see, uk classics started in 1994, then 95, and 96, and 97, and 98, and 99 then 2000 (7 years of production in total).
You dont need to worry about removing the centre cat, though note that your car will run better on super unleaded fuel, and DONT put a 95 wrx ecu in your car, for one your turbo is different and WRX ecu's are designed for a higher octane fuel.
You should be ok with yours as it is.

Tony

turbo200chris

oh rite, thanks, if i were to get a full decat can i remap my ecu or do i have a buy another?? how would super unleaded help? does it make that much of a difference?

joz8968

iTrader: (13)

You'd need a replacement ECU solution. Cheapeat would be a 2nd hand Apexi Power FC - you can prob get one now for no more £350 odd WITH the Commander - check the Classifieds section on here, and eBay...

Then get JGM to come and fit and map it for you for £250 +VAT... and his fuel costs. He will raise the boost to 1.15bar and, with the decat, you should get a max of c.260-280bhp (seriously up from your std 208).

But it'll be the throttle response, on-road manners and proportionally added torque, that'll put a big grin on your head!

rtm4676

I would only run your car on V power, wouldnt even bother with Tescos super or anythings else, V powers the best, buy Octane booster and use a bottle each time you fill up, if your running a dcat you can afford to use something a wee bit stronger. I have to agree that the safest and best course of action is a remap but at £700+ including the commander etc people are opting for the octane only route. BTW most scoobies are not mapped for UK fuel - you decide

turbo200chris

thats good! really, even the uk spec ones! so remapped ecu, full decat and v power and octane booster. does that octane booster even work, n wat does it do?

joz8968

iTrader: (13)

if you intend to do the remap, then the car's ign timing/fuelling/boost, etc. maps will be optimised for whatever fuel you have in the tank, after the mapper's worked his magic. So you don't have to worry about the extra hassle and expense of Octane boosters (I'm sceptical of their effectiveness anyway).

If you KNOW that you'll always use V-Power 99 after the remap, then by all means make sure you have that in you tank for the remap for the maximum gains! If, however, Shell stations are thin on the grounnd in and around your area, then get it mapped on a 97 RON instead (I'd personally opt for Esso Supreme 97 for the actual remap... then run on any 97 thereafter, but NOT BP Ultimate! ).

That way, you won't have to worry about ALWAYS trying to find a shell station... But it will only add an extra layer of protection against det if you do run it on V-Power (after previously getting it mapped on 97). This is what I did.

turbo200chris

yeah, the nearest shell i no is about 12 miles away, lol i mean will tescos super be alrite? as i dont have any esso for miles n miles ok, ill do that then! ive used the injector cleaners aswell, but i duno. will i need a walbro 255 and fse regulator for the better gains?

joz8968

iTrader: (13)

Advisable to fit a Walbo 255l/h pump, yes.

DO NOT fit an FSE fuel regulator!!! - they're extremely flakey at holding a set pressure! In any case, a proper uprated FPR isn't required - save some dosh.

turbo200chris

ok, ill do that! thanks

eggy790

iTrader: (20)

joz quick question.. whats wrong with bp ultimate?

joz8968

iTrader: (13)

Someone (involved in tuning Scoobs), who is an aquaintence of member 'New Scooby 04', had noted that, for some bizarre reason, BP Ultimate literally pulled the timing of the OEM ECU!!! ... Really not want you want is it!

Scoobyben85

Need some help...little but worried about decating my impreza it is a 97 but is a turbo 2000..the decat pipe has had the sensor plug welded over but that isn't a problem..will it be safe to run it without a remap or will I have to get it remapped to have it running safe? A lot of ppl have said it is safe and you won't have a problem and ppl have said the oppersite can some one help! Cheers