Subaru Legacy b4 engines??

gv1.3

gv1.3

Admin
Hi lads,

my brother is buying a subaru legacy b4 twin turbo and has been told that in 2002 the engines changed and one type is known to give problems.

Has anyone any experience of these cars?

Thanks,

Dylan
 
gayan_GT

gayan_GT

Lifer
never head that there was such an issue... have a couple of mates who have this but no one has complained of any issues...
 
azerty

azerty

Supermoderator
main problem with sub engines occures when low octane is filled (at least it is true for JDM STI)
 
gv1.3

gv1.3

Admin
so this would be the same for a legacy?? would it be wise to get a powerfc and get it mapped for 95ron?
 
azerty

azerty

Supermoderator
that's what I did on my sti mate. now I don't know about the legacy, is it a JDM ? does it have STI engine ? if not, I don't think it would be mapped for high octane, but I don't realy know :( which engine code ?

an other wellknown boxer engine problem is the fuelrail system
the way it is designed, last cylindre gets less fuel presure so injector send less fuel, that's why last cylindre is the one that will always blow first.
 
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gv1.3

gv1.3

Admin
not sure what engine code... he just said its the 2ltr twin turbo 280bhp version. It is JDM. He is picking it up on Saturday so Ill check it out then... supposed to be pretty quick motors
 
G

Gally_1

Fresh Recruit
Ive heard only good things about the b4 engines pre 2002 and after 2002, suppose to be nearly impossible to destroy them but theres always one ;)
 
azerty

azerty

Supermoderator
if it is 2 litre and 280 hp, it has to be a sports engine, and probably mapped with agressive timing, might be worth to map the baby for ron 95 then. I've seen one engine like that today in a yard. didn't know they where that powerfull when twin turbo

do you know that legacy year? ECU after 2002 can be mapped using opensource softwate :)
 
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gv1.3

gv1.3

Admin
some impressive figures if they are to be believed... they do quarter mile in mid to late 13s For a big heavy family car thats pretty good...
 
D

Dave@TM-developments.com

Trader
There is a problem with the fuel rail as said, resulting in many 3rd lung failures. They also suffer from various other problems, take a look at the size of the crank for starters. I supply a guy who specialises in Subaru/Alfa flat 4's rebuilding. He is so busy its unreal!
 
gv1.3

gv1.3

Admin
ouch...

Can anything be done with the fuel rail? Or anything to address the other issues that occur with these motors?
 
azerty

azerty

Supermoderator
there are 3 options I know

- cheap : buy a rrfpr and change the way fuel rail has fuel coming in from fuel hose ("H" design instead of "S". contact me thrue msn I'll explain)
- change 3rd injector duty so it will open a bit more than others (don't like this idea that much as it doesn't resolve the problem from where it first came)
- buy an aftermarket fuel rail that resolve the prob
 
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dac69er

dac69er

Super Moderator
my mate got through 3 wrx engines in a year in his subaru. he gave up on it and bought an evo.
 
azerty

azerty

Supermoderator
evo has much reliable engine than wrx/sti ... that's a fact... (but I'm just not ready to go for more than 3 doors yet...)
now things can be done to have those sub beeing reliable. 3 engine a year ? that's quite bad !! was he pushing the boost and/or using crap fuel ?
 
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