i want more bhp out of my car without all the expense, is a straight swap for a bigger turbo an option or would i need other mods to accompany it. anyone got any answers

 

2nd hand sti engine?

 

talkin money there tho arnt we

 

Did you do the basics. Exhaust, Induction kit. Rolling road tuning?
how much you looking to get and what do you have now?

 

If you swap the turbo then you will need a remap for sure so thats the cost of the turbo and a remap which isnt cheap.Unfortunately if it was possible to get more power without spending lots of cash then everyone would be doing it

good luck with the modding bug

 

ive had a custom centre section and backbox made, taken ind kit off as it wasnt agreeing with my car also it needs a new maf so havnt done the rolling road yet.my car is standard at the mo running 240bhp i think,im wanting nearer 280-300

 

Not sure what age your car is. But if its an early scoob then go speak to scott.t on the forum who can do you a scoobyecy chip. Which will maximize what ever mods you have, and even max the turbo you have, and possible get you somewhere near your target figure.

You state 240bhp, so I am guessing a MY95WRX.

If its a MY98 onwards, then go speak to jollygreenmonster on the forums aka Simon. Who can supply and map an Apexi power FC. More expensive than scoobECU but very nice bit of kit.

 

Depends what M car you have and what your power aspirations are. It wouldn't be just a matter of swapping the turbo though. At the very least, you'll need a remap to get the best out of it and ensure it runs safely, you may also need to uprate the cars fueling, depending on what injectors and fuel pump you have fitted- you can't just chuck more air in without extra fuel.

Ns04

 

nice one guys its a 94 m plate so i will try to get intouch with scott.t and get sum more info on that chip. thanks

 

A very inexpensive upgrade would be to replace your ecu with a 'Z4' ECU or 'Z5'ecu. These were standard on late95/96 WRX saloons and gave 260PS standard with 100 octane fuel. With a full decat your probably looking at somewhere in the regin of 270-275PS on 100 octane although the Z5 and Z5 are not mapped to make use of the decat.
They are supposed to be a very similar map to the prodrive classic PPP and run fine on 97 octane super unleaded.
Z4 should cost you no more than £100 (one ebayed last week for £55) and is a straight plug in replacement.
I've just had a Z5 put in my 1993 WRX with a full decat and its a completely different kettle of fish now, way quicker all through the gears.

The scoobyecu's are the ultimate upgrade because I think they have been mapped for a full decat and boost to around 16psi compared to the 12 psi of a Z4/Z5. They are good for 285BHP (not PS) on 97 octane super unleaded with a full decat so should give about 20BHP above the Z4/Z5. They are pricey of late though (think >£250).

 

cheers mate ill look into that z4 z5 ecu info nice one

 

would i need to re map if i put a z4 z5 on tho.or is it as simple as unpluging one and pluging in another?

 

The engine map is contained on the ECU, it controls everything - boost, timings, fueling ect.

Your current ECU will be in a box in the passenger well with some sort of number like 2C.

The full list is:

U8 or W6 ECU is standard 1993/1994 WRX
2C is standard 1994 WRX (a bit of a cross-over between U8/W6 and the Z4)
Z4 ECU is 1994-1996 WRX
STi ECU was SA
STi RA ECU was SB
STi 2 ECU was 6K
STi 2 RA ECU was 7K
WRX RA ECU are W9 or Z5
WRX Wagon 1C, 3B, V9
UK/Euro GT/Aus WRX Saloon & Wagon V7, 7D, 6D

The Z4 and Z5 were subaru ECU maps for 1995 and 1996 WRX's. Subaru refined the maps over the years to develope more power and run cleaner. If you replace your ECU with a Z4 it will already have a different map.

However my point about scoobyecu was that the stock impreza maps will never take full advantage of a decat exhaust, it will still work and should give you no problems - but a map for a full decat will probably give you an extra 5 BHP as it will be specifically set for it.
Of course the scoobyECU also runs on higher boost as well as being mapped for a decat so it will give you about 20 extra BHP.

The Z4/Z5 are plug and go upgrades that you can do yourself in about half an hour - and thats with a cup of tea in the middle

The Z4 is said by many wiser than me on here to be the safest ECU upgrade to early impreza's.

 

cheers my friend some useful info there, im gonna get myself a z4 i think. thanks alot.

 

Powerwrx,

Keep me posted on how you get on with this mate, I'd be interested in doing this mod myself, i have a 93 wrx turbo and looking for more bhp!

Cheers

 

will do mate no problem.

 

You state 240bhp, so I am guessing a MY95WRX.

mines a 95 and it was running 260 standard (import)

95 uk runs at 240 m8

 

Uk 95 runs at 208bhp iirc

 

its a 94 import 240bhp

 

how about a superchip. i am getting one fitted next week (as long as not too much hassle with insurance) according to their site i should get about 40 more bhp. i got a wrx sti iv 98 import so getting a little over 280 already so will be well over 300. i am pretty new to the scooby scene so any comments to this reply would be greatly appreciated for example if there is a better alternative to a superchip or any other mods which will not affect insurance too much.

 

thought about a chip but i dont currently have £100's of pounds spare. i have been told that you could get upto +40bhp but wheather this is safe without any other mods to accomodate i.e uprated fuel pump i dont know. speakin to others as you can see, the z4 ecu is a good starting point ,getting +20bhp just for plugging in another ecu is a good. And all for around £100-£150 second hand.

 

Try Andy F he supplies , installs and maps appexi ecu's , his is known as one of the best around . Would steer clear of superchips do a search and see for your self !!! Espcially with and import as they are set for 100ron a wrx sti will be on its limit on 98 optimax , with just a decat exhaust could be causing the engine to detonate . Best option save money up and buy appexi , there was a group buy on them not sure if still going .I have a scooby ecu which is for my96 and before , was very cheap to buy when first came out now they are going for quite a bit more but they raise boost ,fueling ,alter ignition and change for 98 fuel , totally transform car .

good luck , best advise i can give is take your time and do your re-search you may have to do somthing else first like up grade your intercooler larger top mount or front mount before you can up performance

hope this helps


Mark

 

thanks for the info mate, can i ask what youve got and what ecu and performance your getting .Thanks

 

93 wrx saloon , knocklink , dawes afr , scooby ecu and dawes device set at 1.2 bar ,hks fuel cut defender ,ported headers ported up pipe ,full decat exhaust lagged down pipe and turbo ,freeflowing panel air filter ,larger 99-00 spec intercooler fitted using standard recirc dump valve , 99-00 spec 4 pot brakes , standard clutch and gear box , standard 380cc injectors ,standard fuel pump ,standard td05 turbo. Hopefully around 280 - 300 bhp . Huge difference to when first got the car as it was totally standard then .

Mark

 

Thats alot of work youve had done there mate, mines standard at the mo as you can see from above,need to get saving i think, i definatly want to do some modding to my car.Gonna get this ecu and start from there,new panel filter,dump valve and so on.Yours sounds a top scoob. Any pics of it?

 

Would recommend sticking with standard recirc dump valve and not noisey vent to atmosphere ones can cause problems, porting the headers brings turbo in sooner and can be done by yourself so free do a search on here there are threads that tell you what to do , H&S downpipe is open neck 2.5 inch straight through can be bought for about £175 new makes huge difference pig of a job though to fit nuts usually seized, 4 pots with discs £300 second hand, help stopping discs are larger than 2 pots may require larger wheels as only some clear the 4 pots ,standard 16inch wheels will catch i bought later spec 17 inch alloys . if you want more than 300 bhp need larger injectors ,fuel pump, fuel reg ,possible front mount ,uprated clutch, apexi or other remappable ecu , i have bought nearly all bits second hand off here for fraction of new costs just takes time .
hope this helps still not got around to posting pictures just in the proccess of facelifting the front of the car to later spec.

Mark

 

cheers mate gret info,look forward to seeing your car.

Rob