v3 and v4 sti ecu

[Pappu1]

just to confirm, the v3 and v4 sti ecu are pretty much interchangeable, right?

(so are the sti air flow meters i presume?)

[nt_a_foz]

they have the same plugs yes

[funkytown]

yes interchangeable.. V3 STi usaully 6s and v4 is (i think)8s.

as always v1/2 interchange, v3/4, and v5/6

[ReubenH]

The ECU's are different though. I do believe the V3 is the more... aggressive, of the two. Or at least i've been told...

I'd love to try both and see just how different they are from the drivers point of view.

[kamineko]

 funkytown said:

yes interchangeable.. V3 STi usaully 6s and v4 is (i think)8s.

negative. V4 STI / STI RA / STI R are all ecu code 75

they do share the same pinouts, pretty sure they are interchangable but its the one thing i havn't tried yet. i think the boost solenoid plumbing is different. not sure if its important

[ReubenH]

Does that actually matter though? (i know very little about BCS's)

[kamineko]

afaik the difference is 2 and 3 port solenoid setups. im not sure if both setups would share the same control mapping

[Guest]

Im told the tune between a ver 3 & 4 sti ecu is different.

The difference mostly down to the slightly more agressive cams on the 3. The p20 exhaust housing would play its part as well in the need for a different tune.

[Pappu1]

as far as i read around it seems the v4 sti has slightly more torque and drivebility so tunes must be slightlly diffreent -

on the USA forum there was a thread saying that the type RA had a lower tune than standard sti based on its shorter gearing

not sure if that was true for v3/4 or only v2

[funkytown]

 kamineko']

[quote name='funkytown said:

yes interchangeable.. V3 STi usaully 6s and v4 is (i think)8s.

/quote]

negative. V4 STI / STI RA / STI R are all ecu code 75

they do share the same pinouts, pretty sure they are interchangable but its the one thing i havn't tried yet. i think the boost solenoid plumbing is different. not sure if its important

75... or 7s (7S)...?

[kamineko]

lol. i have spent a lot of time researching these codes. trust me

no formatting. i still have to tidy this somehow for it to display right on the forum

Ver3 GC8 D WRX MT 1S AC721 * D55 AFM: E AA271 MAP: AA090

WRX AT 3S AC740 D34 AFM: AA280?

WRX-RA MT 1S AC722

STI MT 6S AD170 D35

STI-R MT 6S AD170 D35

STI-RA MT 6S AD170 D35

GF8 D WRX MT 2S AC730/1 * D31

WRX AT 3S AC741

STI MT 6S? ?

Ver4 GC8 E WRX ? 7S?

WRX ? 8S? AE380

STI MT 75 AE360 * D66

STI-R MT 75 AE360 D66

STI-RA MT 75 AE360 * D66

22B MT 95

GF8 E WRX MT 88

WRX AT 8Z

STI? ? 8S?

[funkytown]

yer i believe you 5 and S can just look very similiar..!!

[KING PIN]

ok so the question also stands is which ecu would be aggressively tuned for performance etc.... v3 or v4? so i can decide which one to go for , for my v4 wrx... was thnking v4 sti type r or ra, aparetly no difference between both of them so yea ....

[ReubenH]

I would say, if you had to chose between V3 and 4... def go V3 6S

I've got a 6S in the GTB, and it's brilliant. Compare it to the old TT ECU, and it's just liberal with the petrol, crackles and pops everywhere, it's a mean driving experience.

Dunno how it stacks up to the V4 one, but what i've heard is the V4's a bit more tame.

[kamineko]

Reuben do you have experience with the 75? i wish i did so could say for sure. its an interesting question

[ReubenH]

Yeah, i'd love to get a hold of one and see. Till then, all hearsay and ponderings

Only comparison i do have is between the 206KW 3 Plug GTB ECU and the 206K V3 STi ecu. The GTB one was soooooooo boring compared, i never heard a crackle out the exhaust with it.

[kamineko]

oh. this is your black wagon i was following out of taupo? that had a 6S in it? you or Shale did put the hammer down at one point?

well lol its allllll down to weight. 6S or 75 isn't going to make a massive difference. much better than V1/V2 tho

[KING PIN]

so you guys recommend me getting the v3 sti ecu cuase its aggresive thn the v4? or.......?

[kamineko]

STI ecu is always going to be the most aggressive. but an ecu is tuned to a particular engine.

v3 / v4 engines are essentially the same, however its generally said the v3 has more aggressive cams. and they run slightly different turbos.

so you can assume the v3 ecu is tuned around this. how well the v3 or v4 ecus work with slightly different cams is anyones guess.

[KING PIN]

i scored a v3 sti type r ecu D35 for 100 is that a good steal?

[kamineko]

v3 sti / sti r / sti ra are all the same ecu

and they don't come much cheaper than a hundy.

score if it works

[KING PIN]

they guy guarantee me that it definately works cause he used it on his car and has replaced it with a sti so he didnt need this one

[ReubenH]

I picked up two different 6S's for $100 both times, both worked mint. That seems to be the going price. Seen them for much more on trademe though.

[ReubenH]

 kamineko said:

Ver3 GC8D, WRX, MT, 1S AC721 * D55 AFM: E AA271 MAP: AA090

Bump. And can someone confirm that this ECU runs grey tops and a purple AFM?

[kamineko]

 ReubenH']

[quote name='kamineko said:

Ver3 GC8D, WRX, MT, b]1S[/b] AC721 * D55 AFM: E AA271 MAP: AA090

Bump. And can someone confirm that this ECU runs grey tops and a purple AFM?

negative, the 1S or IS runs yellow injectors and Orange AFM. its the bad boy jdm wrx with vf22 and 280ps

your thinking of the 2S which is based on the EJ20G