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Old 11-06-2008, 07:28 AM   #1
colchon
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Member#: 133812
Join Date: Dec 2006
Default can i be maxing out the injectors?

Hi i'm starting to tune my car but have run into a wall

This are my specs of my ej20g

td05-18g
2004 intercooler
eagle rods
wiseco pistons
8.75 compresion radio
legacy gt intake (ported)
complete head work
equal lenght exahust
3 inch de cat-back
cold aire intake
apexi power fc
550 injectores
walbro 255
ssqv

heres is the problem I plug in the wide-band and whent street tunning, but fund my self maxing out the injectors at 0.85 bar, turned fuel rail pressure up to 4 bar but can't hit 12.0 f/r, can this be???? maxing out 550 injectors at 0.9 bar????
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Old 11-06-2008, 09:54 AM   #2
colchon
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ansewerd my own question, it seems to be a problem with the fuel pump
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Old 11-06-2008, 09:59 AM   #3
theonlygreat
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Location: Seattle, WA
Vehicle:
1996 Impreza WRX

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.9 Bar from a TD05-18g is different than .9 bar on the stock turbo, so I guess it is possible you are maxing them out. What afr are you getting to and what RPM is this at?
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Old 11-06-2008, 10:45 AM   #4
colchon
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Quote:
Originally Posted by theonlygreat View Post
.9 Bar from a TD05-18g is different than .9 bar on the stock turbo, so I guess it is possible you are maxing them out. What afr are you getting to and what RPM is this at?
i think y run with a problem in my fuel pump, itīs loosing psi, don`t know explactly why, have to check this but sure i have a problem there, fully closing the return fuel line y can only wet the pressure up to 60/70 psi at idle
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Old 11-06-2008, 11:57 AM   #5
linsavy
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Location: Ontario
Vehicle:
1997 GF4-STiV3 clone

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I run 550cc injectors with a deadbolt td05-16g and can boost 21psi at about 93% duty cycle. Stock fuel pressure with a Walbro. AFRs in the 11s.

Check the sock on the fuel pickup if it is the original. They can get pretty cruddy.
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Old 11-06-2008, 12:09 PM   #6
colchon
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Quote:
Originally Posted by linsavy View Post
I run 550cc injectors with a deadbolt td05-16g and can boost 21psi at about 93% duty cycle. Stock fuel pressure with a Walbro. AFRs in the 11s.

Check the sock on the fuel pickup if it is the original. They can get pretty cruddy.

I was think reaching 90% duty cycle in 21/25 psi, with more fuel pressure than the stock, around 4, 4,5 bar

how much power are you making??
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Old 11-06-2008, 04:22 PM   #7
linsavy
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I don't know how much power I am making as it was a road tune. It must be tons of torque because my clutch is slipping in 5th now, yeah!
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Old 11-07-2008, 10:47 AM   #8
colchon
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Quote:
Originally Posted by linsavy View Post
I don't know how much power I am making as it was a road tune. It must be tons of torque because my clutch is slipping in 5th now, yeah!
jejej great!!!!!!
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