Injector Options

[Swindog]

Right so ive searched some injector stuff on here and it seems we need to list out what upgrades fit into what.

Ie 440cc will fit into a v3 as an upgrade?

Now tell me whats the next size up from 440ccs that will fit striaght into my v5 wrx?

Im maxing mine out at 15psi!

99 V5 Wrx non sti factory 440cc yellow tops.

[funkytown]

 Swindog said:

Right so ive searched some injector stuff on here and it seems we need to list out what upgrades fit into what.

Ie 440cc will fit into a v3 as an upgrade?

Now tell me whats the next size up from 440ccs that will fit striaght into my v5 wrx?

Im maxing mine out at 15psi!

99 V5 Wrx non sti factory 440cc yellow tops.

my version 3 (sti) had 440cc standard (yellows). Not Upgrade. They fit into fozzies and V3 (wrx) and V1/2 that have greys as standard (380cc).

The v5/6 440's shouldnt be confused with v3/4 440's tho as they are different.

I have what i think is the next upgrade in my sti.. purple top Apexi's at 555cc. they are direct plug and play.

then 650 is your next step i believe...

*the above info for is for v1/4. V5/6 is different

[Guest boostin]

I don't know how much truth there is in it, but Dave at D Tech has supposedly decapped the V5/6 yellows to flow something stupid like 800cc. I have no idea whether its true or not, but I have heard it from more than 1 source.

[Swindog]

Ive heard about this decapping aswell. youd think if it were possible more people would know about it.

[Swindog]

 funkytown']

[quote name='Swindog said:

Right so ive searched some injector stuff on here and it seems we need to list out what upgrades fit into what.

Ie 440cc will fit into a v3 as an upgrade?

Now tell me whats the next size up from 440ccs that will fit striaght into my v5 wrx?

Im maxing mine out at 15psi!

99 V5 Wrx non sti factory 440cc yellow tops.

/quote]

my version 3 (sti) had 440cc standard (yellows). Not Upgrade. They fit into fozzies and V3 (wrx) and V1/2 that have greys as standard (380cc).

The v5/6 440's shouldnt be confused with v3/4 440's tho as they are different.

I have what i think is the next upgrade in my sti.. purple top Apexi's at 555cc. they are direct plug and play.

then 650 is your next step i believe...

*the above info for is for v1/4. V5/6 is different

So your apexis wouldnt directly fit my v5?

[funkytown]

correct - they changed fitting in the v5/6 rails. This is limited by the fuel rail fittings however so if you change these you can do as you wish - More farking round with it though. One would suspect you can get apexis or something in the 550 range to fit your rails...

ive heard of, 440, 550, 555, 600, 650, 740, 800, 1000. Im sure there are others

AFAIK they are still side fed however, v8 onwards are top (i think).

The v 5/6 are still yellows but infamously known as the "big yellows" coz they are just a bit bigger in size.

Hope these ramblings make sense...

short story is, its determined by rail fittings, which is determined by manifold type.

*which can be mixed and matched with some careful modification.

[Swindog]

yessir.

My mate has some 850s in his big green starlet which i thnk may fit. Will see if a bottle of Jim will secure them.

[funkytown]

 Swindog said:

yessir.

My mate has some 850s in his big green starlet which i thnk may fit. Will see if a bottle of Jim will secure them.

that would be a fuken steal...

also be careful that the plug fittings to the wires are the same - a real trick for new players.

clearly you will need to re-tune your car before running it at all eh...

[funkytown]

 Swindog said:

Ive heard about this decapping aswell. youd think if it were possible more people would know about it.

yer thats reasonably well known as an art.. definately not a science thats for sure. I think its pretty well known also that it messes up the stray pattern and instead of misting you get much more of a jet.

I would go safe and just buy the right injector at the rating you want/need

[Jammasta]

 Swindog said:

Ive heard about this decapping aswell. youd think if it were possible more people would know about it.

A lot of people have done it with great success.

Its something that if you've tried it you swear by it, but people (like myself) are still sceptical of doing it the "backyard" way.

Not to say it doesn't work, because i've heard from people i have great respect for that it does, and they've done it (not sure on how, someone with more clue can fill in my blanks), but its not the solution for everyone.

[dubbedup]

potential for flooding or poor idle? maybe??

[funkytown]

 dubbedup said:

potential for flooding or poor idle? maybe??

i wud go with just in-accurate..

[caspros]

Coincidentally, on the weekend I decapped some yellow top 440cc I bought of trade me for $160 for fun.

Just got back a minute ago from having them flow tested. Unfortunately rather than going out to the Hutt to get them tested by my tuner, I got them done just around the corner from my work. I'm trying to work out how he tested them, as the figures I've got aren't in cc. However, they are all flowing evenly, at 220 something. Once I figure out the real conversion, I'll let you know the cc increase. The tuner has said the only problem ( apart from increase fuel usage ) will be, over a long time, possible pitting on the cylinder wall ?? But this is over 5-10years.

[Swindog]

Prob be rebuilt a couple times by the time 5-10 years come around.

[gotasuby]

ive got decapped yellows running in my car and they are mint under any power but a bit rough at idle with a possum link and 3 bar map sensor. they flow 960cc at 3 bar and all were withen 1% of each other when i got 16 flow tested

[nt_a_foz]

im pretty sure the way Dave does it is replace the actual cap with a twin spray cap not just drill a bigger hole or whatever the hory backyard way is..

forcefed has these in his car and it does work rated to 800cc and runs perfectly.....

it works and think its about 250 to be done alot cheaper than anoterh set of injectors.....

Dave knows his stuff wouldnt do it if he didnt work thats for sure....

[smokn4]

 funkytown']

[quote name='Swindog said:

Ive heard about this decapping aswell. youd think if it were possible more people would know about it.

/quote]

yer thats reasonably well known as an art.. definately not a science thats for sure. I think its pretty well known also that it messes up the stray pattern and instead of misting you get much more of a jet.

I would go safe and just buy the right injector at the rating you want/need

+ 1

safer option

;D

[PhatRS]

 caspros said:

Coincidentally, on the weekend I decapped some yellow top 440cc I bought of trade me for $160 for fun.

Just got back a minute ago from having them flow tested. Unfortunately rather than going out to the Hutt to get them tested by my tuner, I got them done just around the corner from my work. I'm trying to work out how he tested them, as the figures I've got aren't in cc. However, they are all flowing evenly, at 220 something. Once I figure out the real conversion, I'll let you know the cc increase. The tuner has said the only problem ( apart from increase fuel usage ) will be, over a long time, possible pitting on the cylinder wall ?? But this is over 5-10years.

Are we talking V5-6 sidefeeds or newage top feeds? I was sure before that the later sidefeeds could be decapped but was told categorically no it was only the top feeds.