supercharged fuel injector size

[Jordo2]

gday, are 42lb injectors too big for vn supercharged on 8psi? and are 28lb inj too small? cheers.

[scouser king]

gday, are 42lb injectors too big for vn supercharged on 8psi? and are 28lb inj too small? cheers.

28lb bit to small,iam using 42lb on my vp v6 with powerdyne@5psi and plan to upgrade to 10psi with the same injectors(42lb)

[Jordo2]

28lb bit to small,iam using 42lb on my vp v6 with powerdyne@5psi and plan to upgrade to 10psi with the same injectors(42lb)

Awesome thats what I had hoped, I picked up a brand new set for 420. Reason being, my car is running 8 psi on buick pos dis charger. It has been pinging even under light loads. In fact I havent put my foot down at all bcos of it. I figured larger INJ would help even things out?

[MR 1JZ]

you will need to tune the car and maybe fit an adjustable fuel pressure regulator to make sure you get a good spray pattern out of larger injectors

[Jordo2]

you will need to tune the car and maybe fit an adjustable fuel pressure regulator to make sure you get a good spray pattern out of larger injectors

yes, ive got a malpassi rising rate yet to go on aswell, and allready hav a tune but it seems to b tuned 4 lower boost, and am having trouble finding a boost press location on the charger where i can connect a reg and boost gauge to? i dont want to hav to drill out the valley plate. any ideas?

[immortality]

standard L67 uses 36lbs injectors.

ditch the rising rate reg, fit the standard reg and get a proper tune to suit the injectors you end up getting

[Jordo2]

standard L67 uses 36lbs injectors.

ditch the rising rate reg, fit the standard reg and get a proper tune to suit the injectors you end up getting

i prob shouldve asked b4 i bought it

[Jordo2]

28lb bit to small,iam using 42lb on my vp v6 with powerdyne@5psi and plan to upgrade to 10psi with the same injectors(42lb)

does your type charger make more power than mine at the same amout of boost? and if so, why?

[scouser king]

does your type charger make more power than mine at the same amout of boost? and if so, why?

Iam putting down 250ph@wheel(with a shit auto that slips)but i have a lot engine mods as well eg: big lumpy cam ,over size pistons,custom twin mainfols and so.

[VN Wagz]

36lb injectors from a super6 are 370cc, will support (at 80% duty cycle) around 420hp at the crank... you can use either a stock regulator, a rising rate, or a fixed rate reg- mine feeds 1psi more fuel pressure per psi it sees, which is 1:1 preset rate, and apparently helps with tuning due to the base pressure being adjustable (bigger squirters can run well at lower base when chasing higher power).

[delcowizzid]

even the stock reg will rise at a 1:1 rate hence why i and a lot of other tuners allways tell people not to replace them the aftermarket regs dont hold constant pressure and can vary from day to day and are badly affected by heat and other weather variables

[VN Wagz]

i and a lot of other tuners allways tell people not to replace them the aftermarket regs dont hold constant pressure and can vary from day to day and are badly affected by heat and other weather variables

I reckon Turbosmart would love to reply to that statement.

My FPR800 is dead fkn sexy, for that i love it to bits... that and the base pressure adjustment.

[MR 1JZ]

standard L67 uses 36lbs injectors.

ditch the rising rate reg, fit the standard reg and get a proper tune to suit the injectors you end up getting

when using bigger injectors a small increase in fuel pressure can help obtain a better spray pattern from the injectors...and the same amount of power can be made from less duty cycle...i would agree the rising rate isnt necessary but perhaps an adjustable 1:1 regulator should be fitted

[Jordo2]

Iam putting down 250ph@wheel(with a shit auto that slips)but i have a lot engine mods as well eg: big lumpy cam ,over size pistons,custom twin mainfols and so.

did u have to get a different cam to suit boost? or is it an n/a cam grind?

[scouser king]

did u have to get a different cam to suit boost? or is it an n/a cam grind?

my cam (so far from stock) was part of a engine rebuild i got done and the blower was put about 8 months later.but some blower set ups dont like lumpy cams.your best bet is check with your local performance shop or talk to the guys on here,iam 100%.

[Jordo2]

my cam (so far from stock) was part of a engine rebuild i got done and the blower was put about 8 months later.but some blower set ups dont like lumpy cams.your best bet is check with your local performance shop or talk to the guys on here,iam 100%.

cheers 4 that. since im in perth aswell [hamilton hill], do u kno where i can get my delco tuned to run my 42lb inj? so far ive found none in perth.

[scouser king]

cheers 4 that. since im in perth aswell [hamilton hill], do u kno where i can get my delco tuned to run my 42lb inj? so far ive found none in perth.

I got my vp done at
Walkinshaw Performance & Formula Tech Dyno Centre
61 Miguel Road
Bibra Lake.
Phone: 08 9494 2424
there not cheep but they do a good job

[Jordo2]

I got my vp done at
Walkinshaw Performance & Formula Tech Dyno Centre
61 Miguel Road
Bibra Lake.
Phone: 08 9494 2424
there not cheep but they do a good job

thanx heaps 4 that mate, uve saved me alot of dramas.

[scouser king]

it all good hope it turns out ok