v5/6 WRX engines (non STI) what CR?

[gazzy2000]

Hi,

Just need some info on standard WRX engines and ECUs (non STI) questions:

- does anyone know for absolute sure that the standard WRX v5/6 engine run 9:1 compression ratios?

- do NZ new ones have higher PSI boost?

- how do you tell one is NZ new as oposed to JDM (i spose the model/chassis numbers are the indicator here?)

- do all v5/6 WRXs & STIs run yellow injectors?

- what turbos do standard v5/6 WRXs come out with?

Much appreciated

[wrx_lou]

A nz new will have a white 260km gauge. Will usualy be running yellows etc and boost slightly higher at 1 bar. I believe 4 pots are optional. They also have no speed limiter and a td04l turbo.

[Guest DMSREX]

They don't run 9:1 CR thats wrong. CR is 8:1 Boost in mine (NZ New) 14.5. Radio aerial mounted on front A pillar not the back of the roof.

Standard injectors 440cc dunno what colur they are though. 4 Pots on the front are standard fittment.Build date on plaque mounted on passenger side B pillar.

[Stoffa]

AFAIK the only ones running 9:1 are revision d legacy's but only in manual

[gazzy2000]

spoke with chap at J3 Automotive in CH-ch and by his books and speaking with his engine builder they said they are 9:1

[newsuba]

NZ new WRX and STi ran 8.0:1

NZ new ran lower boost, output 155kW/290Nm

Cf. JDM sedan 206kW/328Nm, wagon 179kW/308Nm.

[Stoffa]

 gazzy2000 said:

spoke with chap at J3 Automotive in CH-ch and by his books and speaking with his engine builder they said they are 9:1

well I read it on the internet so it must be true!!

lets work it our another way then, They both run the same crank/rods and head castings, so the only difference is in the pistons.

Who knows the difference between a semi forged v5 sti piston and a cast v5 wrx piston?

The V5 sti pistons have the square dish in them I can tell you that much, not sure if they have a different offset pin height though

[gazzy2000]

 Stoffa']

[quote name='gazzy2000 said:

spoke with chap at J3 Automotive in CH-ch and by his books and speaking with his engine builder they said they are 9:1

/quote]

well I read it on the internet so it must be true!!

all good man, just want a definitive answer from someone that actually knows... not dolphin answers

[gazzy2000]

 DMSREX said:

They don't run 9:1 CR thats wrong.

do you have this answer from reliable source? plse justify this answer?

[Guest DMSREX]

 gazzy2000']

[quote name='DMSREX said:

They don't run 9:1 CR thats wrong.

/quote]

do you have this answer from reliable source? plse justify this answer?

Not that i have to justify anything to you.....but yeah the actual owners manual that came with my car.... :

Your man at 33 whatever is right & FHI are wrong what would they know. !!

Cheers

Dolphin

[gazzy2000]

 DMSREX']

[quote name='DMSREX said:

They don't run 9:1 CR thats wrong.

/quote]

do you have this answer from reliable source? plse justify this answer?

Not that i have to justify anything to you.....

Nope, you dont have to justify anything at all, but having a virtually unknown person post "they dont run 9:1..." without a rational explanation holds as much credibility as david bain anouncing that he didnt 'do it'.

So explain it dopey or STFU and dont bother

[Stoffa]

good thinking, i've got the manual from a NZ new v5 wrx and it says its got an ej205 at 8.0:1 compression ratio

and FWIW if your engine builder had the heads and face of an engine resurfaced for a rebuild, then he measured everything up using a factory head gasket it would have higher compression than factory anyway.

[gazzy2000]

 Stoffa said:

good thinking, i've got the manual from a NZ new v5 wrx and it says its got an ej205 at 8.0:1 compression ratio

Alright then, so that begs the question what v5/6 were 9:1 (if any) autos??

[Stoffa]

just modified my post read back one, theres no mention of any difference between auto or manual compression ratio.

dont believe everything an engine builder tells you as gospel

[gazzy2000]

 Stoffa said:

just modified my post read back one, theres no mention of any difference between auto or manual compression ratio.

dont believe everything an engine builder tells you as gospel

yea nup i dont take anything as gospel these days.... every man and his dog is a fukin expert these days lol

This is what i am trying to do... my BH with the ST conversion done is 9:1 right, its running a link insert, i want to sell the link and run a WRX ECU (or what ever ECU) that is tuned for 9:1. SO its rather important i get the right information before i fit it.

[Stoffa]

whats a link insert?

not a plug in link obviously?

[gazzy2000]

 Stoffa said:

whats a link insert?

not a plug in link obviously?

yea plug-in i.e. fit/insert inside your OEM ECU case

[Stoffa]

is your BH a rev d model running AVCS and V7 throttle body? cos I thought that was the ONLY one running 9.0:1, if you've got a v5/6 equivilent setup then im 99% sure it'll only be 8.0:1 ie same as wrx

[Stoffa]

 gazzy2000']

[quote name='Stoffa said:

whats a link insert?

not a plug in link obviously?

/quote]

yea plug-in i.e. fit/insert inside your OEM ECU case

why would you want to swap? just get it retuned for the single setup

[gazzy2000]

 Stoffa']

[quote name='Stoffa said:

whats a link insert?

not a plug in link obviously?

/quote]

yea plug-in i.e. fit/insert inside your OEM ECU case

why would you want to swap? just get it retuned for the single setup

it is LOL, long story.... its the missus's car, she wont let me do anything else to it, i have my BG with ST done and am happy with that, i wanna generate some cash as the link is gng to waste in her car

[gazzy2000]

 Stoffa said:

is your BH a rev d model running AVCS and V7 throttle body? cos I thought that was the ONLY one running 9.0:1, if you've got a v5/6 equivilent setup then im 99% sure it'll only be 8.0:1 ie same as wrx

didnt see this post sorry, my BH is a 2001 Rev C, so yea its like a v5/6 setup, but i can 100% gaurantee it is 9:1 CR (after MAJOR detonation troubleshooting when i did the ST converion)

The story goes that the v5/6 STI ECU i was initially using was tuned for 8:1 CR, the BH5 engine was 9:1.. the STI ECU and CR mismatch caused too far advanced timing causing major Detonation. Had to get a Possum link and tune to suit.

[Stoffa]

sweet, I understand now, your trying to find a stock ecu to run your car. I've got one from a nz new auto V5 non sti if you want to try. I can just send it to you if its no good send it back

[gazzy2000]

 Stoffa said:

sweet, I understand now, your trying to find a stock ecu to run your car. I've got one from a nz new auto V5 non sti if you want to try. I can just send it to you if its no good send it back

yea right.. that cud be the go thanks, i still hav emy home made Knock listening device too.

I will PM you my address..

[gazzy2000]

K, i emailed a chap by the name of Ewan Clubsub username = todagt, he is a tuner and I believe many know him on here.

I emailed him and asked him the question bout non sti CR etc. He states that the non sti is 9:1.

He may jump on here and explain what he knows...

[Stoffa]

sweet we maybe onto a winner with my ecu then, i'll get it sent today, sorry i was too busy yesterday