forester sti upgrade

[Guest sleeperfoz]

well some info on what can be done

1997/1998 stb forester manual. (does not apply to auto or ttb forester)

a good upgrade for a standard stb forester

1. v3/v4 sti 3 plug ecu.

2. v3/v4 yellow 440cc injectors.

3. v3/v4 orange sticker afm ( air flow meter)

4. remember that sti of that model run a standard 16psi,so you will need a boost tap or electronic boost controller.

5. you could also use a v3/v4 sti waste gate actuator

6.you will have to switch out the old intake pipe after the afm. as the sti afm is larger.

this can be done by sourcing the v3/v4 intake and air box.

aswell as using an aftermarket intake, such as zerosports,hks and so on.

ok so thats a good 20 to 30 kw increase on the forester.

Things to remember,

ecu is on the passengers side floor under the kick panel(where you put your feet under glove box)

NEVER HAVE BATTERY CONNECTED WHEN PUTTING ECU IN OR TAKING OUT!!!!

stb fuel rails are the same as v3/v4 sti.

DO NOT RUN sti afm and ecu with standard grey injectors!!!!!!

(YOU WILL BLOW IT UP WHEN IT LEANS OUT AT 16 PSI)

If i have missed anything please post up the details.

Please remember that if you are unsure on how to do this,contact a mechanic!

Happy cruising 8)

[cpt kernow]

I'm happy about that, now just gotta save up and keep a sharp eye on trademe.

Are the pistons and gaskets etc ok with the increase in boost?

[Guest]

 sleeperfoz said:

well some info on what can be done

1997/1998 stb forester manual. (does not apply to auto or ttb forester)

Thanks Will . . .

Any Idea's on upgrading my automatic ttb weapon of mass DeForestation?

[cpt kernow]

get the gearbox and diffs out of a rolled foz? lol

only kidding. I wonder if the ecu out of a JDM forester would make a difference?

[Sudo]

Quick question, would using STi ECU, but still on 14PSI make a difference?

I'm wanting to buy another STi ECU, but cant afford injectors and afm just yet. So would there actually be a power increase even 13/14psi?

[ReubenH]

14psi, just means you're not getting as much power, nothing actually wrong with it i think. And yes, the STi ECU is very different, driving with one is good fun. But you'll want to get 16-18 PSI in there pretty quick.

And yeah, i'm curious on the auto fozzy. Don't tell me they get that 1-plug-wonder ECU than the Auto GTB's do. I will laugh if that's the case I sometimes wonder if they did that just to spite them. "Hah, no STi conversions for YOU"

[Guest]

Feel free to come over and inspect to find out Reub! Wouldn't surprise me tbh

[Guest sleeperfoz]

 cpt kernow said:

I'm happy about that, now just gotta save up and keep a sharp eye on trademe.

Are the pistons and gaskets etc ok with the increase in boost?

yep same engine as the v/3 v/4 as far as i can remember with the old forums.

mine has run 22 psi without hassle.

you will get some blowby from the breather on the drivers side

catch can will cure that.

[Guest sleeperfoz]

 Sudo said:

Quick question, would using STi ECU, but still on 14PSI make a difference?

I'm wanting to buy another STi ECU, but cant afford injectors and afm just yet. So would there actually be a power increase even 13/14psi?

the standard ecu will go to 14.97 psi or one bar. with boost tap or ebc.

I am unsure as to weather the sti ecu would make a difference.

I myself wouldnt do it unless i had all the sti gear

[Guest sleeperfoz]

 matdaymon']

[quote name='sleeperfoz said:

well some info on what can be done

1997/1998 stb forester manual. (b]does not apply to auto or ttb forester[/b])

Thanks Will . . .

Any Idea's on upgrading my automatic ttb weapon of mass DeForestation?

yep make it a manual!! ha ha

sorry matt all i know is that the ttb are all auto.

ruebs may be correct on the one plug special.....honestly i dont know

[cpt kernow]

I mentioned it because the t/tb is an aussie/NZ edition and thought they may have just toned it down to meet emission standards. It's probably got all the same parts as an s/tb but needs a different ecu or remap?

All this is pure speculation, I don't have a clue, just guess someone else might.

[Guest sleeperfoz]

 cpt kernow said:

I mentioned it because the t/tb is an aussie/NZ edition and thought they may have just toned it down to meet emission standards. It's probably got all the same parts as an s/tb but needs a different ecu or remap?

All this is pure speculation, I don't have a clue, just guess someone else might.

i would hazzard at a guess that if it does have the same 3 plug ecu,some of the pinouts would be transmission

related?

it would be interesting to see if you could get an eprom burnt for the auto if the ecu is a single plug. :-\

well matt you had be different mate ;D

[Guest]

Mwahahahaha! T/TB Foresters have 3 plug ecu's! STi Conversion on the cards in the future!

[ReubenH]

Yeah, i tore up mats carpet to have a look ;D. It's a 5W and it's an orange sticker, if that means anything to anyone.

[Guest sleeperfoz]

you would have to be sure that nothing is (auto) related in ecu first

i have my old ecu in my hand and it is a 4w :-\

[ReubenH]

Well the auto plugs would probably take up empty slots on the ECU right? So as long as you do a manual conversion first, you're sweet right? Or is there more to it than that. It's always worth a shot at least.

The GTB's 3 plug was totally compatible, everything related to the TT was on a blank plug on the STi ECU.

[Guest sleeperfoz]

 ReubenH said:

Well the auto plugs would probably take up empty slots on the ECU right? So as long as you do a manual conversion first, you're sweet right? Or is there more to it than that. It's always worth a shot at least.

The GTB's 3 plug was totally compatible, everything related to the TT was on a blank plug on the STi ECU.

you may be on to something ruebs

have a shot matt you may be the first to upgrade a ttb

[Guest]

Yeah I'll definitely give it a go in the future, though first on the upgrade cards for my weapon of mass DeForestation is ripping everything that lives under the wheel arches out and replacing it with Version 7 gear as soon as I can source the said Version 7 gear and money :

[uwantsumbeef]

can anyone tell me if this: http://www.trademe.co.nz/Trade-Me-Motors/Car-parts-accessories/Subaru/ECUs/auction-204551402.htm

will be a good replacement over a standard 2001 Forester Turbo ECU?

[Guest sleeperfoz]

is yours the 3 plug?

is the 2001 a 3 plug?

if it is yes,however you would still need to upgrade afm and injectors to suit the ecu.

dont know much about the 98 onwards,would pay to check the ecu numbers to see that it is an sti ecu

[uwantsumbeef]

this is what mine looks like...to be honest i had no idea what i was looking for so thats why i took some pics.

So a straight swap of ECU will not give me any gains in anyway of the standard one?

[Guest sleeperfoz]

a bit different to the v3/v4 which in pic below

unless the plug sizes are the same?

dont know to be honest :-\

[ReubenH]

Yeah, weird. That first one pictured has 3 plugs, yet 4 sockets. These are the later ECU's for the Phase-II engines such as in the V5 and 6. When i talk about 3 plug's atleast, i'm refering to the yellow socket 3 plug pictured above. These are the 96-98 ish impreza/forrester/GTB ecu's.

[benniepak]

 sleeperfoz said:

well some info on what can be done

1997/1998 stb forester manual. (does not apply to auto or ttb forester)

a good upgrade for a standard stb forester

1. v3/v4 sti 3 plug ecu.

2. v3/v4 yellow 440cc injectors.

3. v3/v4 orange sticker afm ( air flow meter)

4. remember that sti of that model run a standard 16psi,so you will need a boost tap or electronic boost controller.

5. you could also use a v3/v4 sti waste gate actuator

6.you will have to switch out the old intake pipe after the afm. as the sti afm is larger.

this can be done by sourcing the v3/v4 intake and air box.

aswell as using an aftermarket intake, such as zerosports,hks and so on.

ok so thats a good 20 to 30 kw increase on the forester.

Things to remember,

ecu is on the passengers side floor under the kick panel(where you put your feet under glove box)

NEVER HAVE BATTERY CONNECTED WHEN PUTTING ECU IN OR TAKING OUT!!!!

stb fuel rails are the same as v3/v4 sti.

DO NOT RUN sti afm and ecu with standard grey injectors!!!!!!

(YOU WILL BLOW IT UP WHEN IT LEANS OUT AT 16 PSI)

If i have missed anything please post up the details.

Please remember that if you are unsure on how to do this,contact a mechanic!

Happy cruising 8)

hey just wondering if the stock turbo will handle 16psi??? sory im new to all this

[nt_a_foz]

TDO4 factory turbo probably would be ineffiecient past say 14psi...

Although sleeperfoz was running 20psi through his but in saying that its crapped out hahah

If you want to upgrade get a vf series sti turbo good upgrade