terzo204

A friend of mine has just bought a MY94 JDM WRX and he's thinking about modding it.

What should he do first? I know he's thinking about getting a decatted exhaust, if so, does the car have to be remapped to avoid the dreaded DET?

Also, if he did get a decat and remap (if that's possible) what gains should he expect? I think the car is 240 standard.

Finally, does the car need to be remapped for UK fuel or will SUL be ok?

Any advice gratefully recieved

terzo204

Bump

samcowrx

A lot of people will avoid posting on this thread because the world of modding snowballs, it depends what gains he is after eventually, and how much he has got to spend really

terzo204

What with him just buying the car I think the decat and remap is the only mod he could do right now.


Doest anyone know if he will need a remap even without the decat, to map it for UK fuel?

Cheers

djquest

iTrader: (8)

hello mate,

i have subaru impreza wrx 1994 jdm, When i first got my car all i did was run it on Shell V power. i didnt get any problems. the first mod i did was get a centre decate. followed by decatted downpipe, Then i went and got a els chip, which is same one as polar performance chip. This gave me much better performance. around the 280bhp mark.

Since i have owned the car i have done the following mods.

- Centre Decat
- Decat Downpipe,
- Ninja Back box,
- Stainless Steel tubular headers - ( You can also get your current standard ones ported they are much better lower - mid end and feel allot more torquey)
- 440 CC injectors ( brought them on flat4online whom advertised it as 550CC)
- FMIC
- Black Mamba Viper induction kit
- 4 Pot brakes,
- vented, cross drilled discs all round
- Light weight Pullys
- 5 paddle clutch
- Exedy Light weight flywheel
- Front and rear strut brace,
- Walbro Fuel Pump,
- Knocklink sensor
- Esl Board plus custom remap @ PTS - which cost way too much (£801 for the remap + £250 for the chip) - you would be better of getting Apexi Power FC, which something i plan to do.

- KPH - MPH converter - fits behind the dashboard.
- Hybrid technologies electronic Boost Controller and guages.
Prolly done other bits but may have forgotten.

All the above gave my 300bhp - 277lb torque @ 1 bar of boost
When i run it at 1.35 Bar i get 342bhp - 321lb torque.

this is basically the limits of the engine and gearbox. Also to note you car prolly has TD05 turbo innit. which when on a standard 240 scooby i found to be very laggy.

if you just want to get close to the 300 mark, i would say get the car fully decated ( yes it will pass the MOT coz mine does with no Cats), get the headers ported and get a esl or polor performance chip. This is if you plan not to go beyond the 300mark.

if you do want to get past the 300 mark later on then get a apexi installed and mapped ( prolly cost around 750 for including a Map). this way if you do want more power and want to mod the car further, remapping will be cheaper. Normally a re-map of an apexi is around £250.

All the above im stating is from experience from modifying the same car as your mate.

i hope this helps you and your mate out.

regards,

djquest

myblackwrx

iTrader: (1)

How come you got charged £1000 for the esl remappable chip it's only about £350 for the chip + £200-250 for the remap and how come you hard to decat the centre section as early imports only have 1 cat in the downpipe.
JollyGreenMonster.co.uk charges £600 for the esl chip and map.
The polarperformance remappable chip can be remapped for any mod (bigger turbo etc so will go over 300bhp if you have supporting mods.

To answer the OP a decat and run it on Vpower or Tescos99 ron and it will be fine but a reamp wiull get the best out of the decat

djquest

iTrader: (8)

i got this done couple of months ago after i brought the car. this is roughly 2 years ago. At that point in time their wasnt esl remappable chip. i had to go to PTS Performance in luton to get my car remapped. hope that explains why it cost so much

myblackwrx

iTrader: (1)

that does explain it

djquest

iTrader: (8)

i only know how much it cost me coz i was going through my car reciepts and stuff and it showed the total as £801

djquest

iTrader: (8)

i only want to get an apexi power fc coz i want to be able to use the FC commander to get info and maybe to tweak it a bit if and when i need it. everybody has their preference when it comes to modding. you know how it is

myblackwrx

iTrader: (1)

Wasn't criticising just quering because of the cost but since it was before the remappable daughter board was avaliable that explained it.
The Apexi is now quite hard to get for early cars but i do like the Commander function (my mate has 1 on his 94wrx mapped by JGM who is very good)

djquest

iTrader: (8)

yeah the apexi are hard to get. i have seen a few being sold on the net and in japan but are around 500 mark which includes the commander, which isnt too bad i think. Then again it depends on how further i go. if my engine goes bang, then it will be 2.5 route for me and in that sense, i would want an apexi plus it depends on my budget as well. BTW i found a cat on the centre pipe on my scoob thats why i brought a centre decat aswell.

i wish their was a mappable board when i had the chip fitted. oh well thats life.

terzo204

Thanks for the guidance gents.

So in summary My friend might be looking at:

Chip + Remap = 600
Decat DP and Centre Section = 300 (?)

Total gains in the order of 240 to 280?

myblackwrx

iTrader: (1)

Decat about £120 , as i said i'm surprised that djquest had a cat in the centre section as it's normally a resonator.
A good quality exhaust can be bought from Revolution Performance Motorstore :: Alloy Wheels, Tyres, Auto Performance and Styling Parts and nicely priced imo
Uprated fuel pump would be worth it (and maybe an fpr)

terzo204

The revolution exhausts start at £319 which is great value.

Will there be any issues with getting just a decat? I assume this will give about 30 increase?

Ditto your thought about the resonator (having just done it myself)

myblackwrx

iTrader: (1)

The decat alone will give you quicker spool up and a few more bhp but if your mate gets the remap at the same time the remap will make better use of it.

My 93wrx has a decat (no remap) and gave a few more bhp and has had no problems running like that.

terzo204

The revolution web site claims that a standard (except filter) UK Turbo had gains of 45 bhp from the straight through exhaust alone.

I might suggest he gets the exhaust now, then when funds permit, a remap, fuel pump and filter later. This should see best part of 280 going on what you guys have said.

Whats the limit of the turbo? 300?

myblackwrx

iTrader: (1)

It depends on the health of the car etc ,i'm not saying your mate won't get big increases but be prepared if he doesn't.
the TD05-16g (standard turbo or should be) is good for betwwen 300 and 330bhp running 1.2+bar boost (these figures are approximate and not set in stone but just to give you an idea).
The TMIC is a major limiting factor as well as the early ones are pretty poor.

terzo204

Thanks,

Sounds like a new TMIC and fuel pump would be good precautionary measures, but the exhaust would be a good first move.

The car is immaculate and low milage so I can only assume it's healthy.

Do you think a 30 break increase might be achivable with the exhaust alone?

myblackwrx

iTrader: (1)

Wouldn't worry to much about the tmic for the mo (it's a pain in the **** getting a later model one to fit).
The 30bhp may be achievable but i can't say for sure just get it fitted and try it.

terzo204

I will pass that on.

Are there many second hand exhausts on the market and where's the best place to look?

rossyboy

iTrader: (8)

I suspect 30 is the absolute most you would see without a re-map and not many would get that high. For example, mine registered a 7 bhp increase when I first took out the cat down pipe.

terzo204

Interesting rossyboy.

Thanks for the input. I guess a remap is required to get the most out of the mods

osborne

if he hasen't purchased a centre pipe decat i've got one he can buy for a good price. I ended up with two when i brought one so just make an offer

AlanPPP

iTrader: (2)

Hasn't the 1994 got a TD04?

And the 95> TD05

I've had a 94 and a 95 and my 94 was fully decatted and it was very quick! Totally changes the car.Because the TD04 is a smaller turbo is spools up quicker too.

Oh and if it hasn't got a boost gauge get one.Also Run it on V power and NF booster and it should be fine till he can afford the remap.

I think that's all correct! lol

terzo204

V-Quick - was it remapped too?

It has a boost guage luckly. Why is it a must?

Doe's he really need to use octabe booster?

mac12

all had same turbo td05 just different ecu's z4 in the 95/96 being the 256bhp,
the wagon import has the td04.
when i had a z4 ecu fitted it was fine on just v power no booster needed and no knock activity.

terzo204

Thanks Mac12

myblackwrx

iTrader: (1)

Jap Performance Parts : Home

Essex Subaru Breakers

Or look in the 'For Sale' sections on this forum ,i got my calipers,exhaust,ecu and rear bumper from people on here.