Dave1980

The time has come to begin doing some mods to the engine ,now, had the car for 3 years and only ever put a dumpvalve on (which is now Gone!). The car itself had a lot of suspension mods etc when i had it.

As far i know the engine is pretty standard other than the hks exhaust and the sti 2 ecu i put in.
So currently around 260bhp.

I would like to get up to around the 300bhp mark, although whats the cheapest and best way to do it?.

I was thinking along the lines of a decat and maybe an adjustable boost controller and an induction kit.

Just interested to hear from those who have done it how they did it and what their opinions are.

Please do not muppetise this thread, this is a genuine question. And ps lewis or whatever name you are using now keep your opinions to yourself and go and have a cup of cocoa and go to sleep.

Thanks
Dave

StiX

iTrader: (4)

LOL @ the cocoa

Not sure about the ecu, but a 93 with just a backbox change will be producing about 240bhp? They are 240ps as standard - 236bhp.

If the STi2 ecu is similar to the Z4 however, then you will have about 250-255?

Definitely decat, as you are pre Sep 95 you have no need for cats for MOT anyway.

I wouldn't go for an induction kit, just a panel filter change - cost you £30-40 and 5 minute job to change.

Due to early ecu, you will need an Apexi power FC for remapping (£700ish), possibly bigger injectors (not sure) and fuel pump.

Your TD05 is good for 350bhp so no worries there.

The slanty TMIC is a real bottleneck apparently, so something like an STi 5/6 would be good enough for your 300bhp.

myblackwrx

iTrader: (1)

A mate has a 94 wrx which is running 310bhp/280lb torque (figures from Roger Clark rolling road)
1 Apexi power fc mapped by JollyGreenmonster
2 Uprated headers
3 Decat
4 Uprated fuel pump
5 HKS backbox
6 HKS induction kit

myblackwrx

iTrader: (1)

A mate has a 94 wrx which is running 310bhp/280lb torque (figures from Roger Clark rolling road)
1 Apexi power fc mapped by JollyGreenmonster
2 Uprated headers
3 Decat
4 Uprated fuel pump
5 HKS backbox
6 HKS induction kit
As STIX said
The intercooler is the main limit for horsepower you can uprate the tmic with any from the classic shaped some require a bit of work to get them to fit, injectors might need uprating as my mate has seen his injectors nearly maxing out (possibly due to the warmer weather as he had the car mapped in the winter)

Dave1980

thanks guys, few ideas there. didnt think about the intercooler. will keep you posted. going to do some shopping round.

[Davey]

We've been playing with our 94 WRX..

So far its had a decat, larger intercooler and a panel filter.. The decat made the biggest difference, turbo spools up so much faster and the car is much more responsive.

I doubt there is much more power its just much more of a pleasure to drive now.

Dave1980

might go straight for the decat. should i get anything else or just go ahead and do it?

eg am i going to damage anything just doing a straight decat?

StiX

iTrader: (4)

I wouldn't have thought so. A lot of people advise getting a remap as soon as you decat, but it would probably be fine. Its obviously best to remap but I wouldn't say essential.

My MY95 had a full decat, and it upped the boost a bit naturally but not that much. Fitted a knocklink and everything fine on just Optimax (Z4 ecu though).

scoobfan

Are you sure about that ?

Rob

scoobfan

For your 300bhp target you'll be OK with the standard Intercooler and injectors, although they will nearly be at their max duty cycle.

The uprated fuel pump, such as Walbro is a good idea, not just becasue
it will flow more fuel but as a safety net, your car is getting old and it's
worth doing.

Full decat (wrapped)
Flowed headers (Wrapped)
Uprated fuel pump
panel filter (not induction kit)

And if you can stretch, go for an Apexi Power FC (Mapped)

This should see your car at 300bhp

Rob

Moley

iTrader: (9)

Might be worth considering one of these......
http://bbs.scoobynet.co.uk/showthread.php?t=513866

scoobfan

Rob

StiX

iTrader: (4)

Unless the laws have changed yes:

when I had to MOT my MY95, it failed the emissions even after I had put the centre cat back on (it had a full decat).

Wondering where to go next, I trawled scoobynet and SIDC and apparently pre Sep95 imports are not an exact match on the register, so can be MOTd with the non-cat test.

Worked for me, so unless they have changed this loophole it still is there.

Moley

iTrader: (9)

Ooops....note to self: read the thread before posting a link!!!!

[Davey]

Shouldnt have a problem with just the middle cat, unless its fubar'ed..

The first cat is a pre-cat and not really required over here, same with just about every modern car that has a pre-cat.. Its not needed. Theres more of a chance that you have a fueling problem.

StiX

iTrader: (4)

Failed on centre cat alone? Nowt wrong with it?

Dave1980

decat and new fuel pump here we come,