Need Uprated Injectors For 1997 JDM Ver 3 STi
Thread Starter
Scooby Newbie
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From: Barbados
Need Uprated Injectors For 1997 JDM Ver 3 STi
Hi Guys,
I have a friend here who has a 1997 JDM STi, Ver 3 I think. He needs larger injectors, but is unsure what to buy, and has already bought one set that didn't fit. Can anyone please point me to websites, sellers etc. for any uprated injectors available specifically for the car.
Thanks,
Dennis
1990 Toyota Celica GT-Four
2001 Subaru Impreza WRX STi
http://member.newsguy.com/~gtfour
I have a friend here who has a 1997 JDM STi, Ver 3 I think. He needs larger injectors, but is unsure what to buy, and has already bought one set that didn't fit. Can anyone please point me to websites, sellers etc. for any uprated injectors available specifically for the car.
Thanks,
Dennis
1990 Toyota Celica GT-Four
2001 Subaru Impreza WRX STi
http://member.newsguy.com/~gtfour
Scooby Regular
Joined: May 1999
Posts: 2,637
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From: SSO2003 2nd, SSO2005 1st, SSO2006 2nd, TACC Rd4 5th 4wd: In my car ;-)
Has he up rated the fuel pump yet ?
Depending on how much power your friend wants, it may be a case of increasing his fuel pressure, using an adjustable reg'.
STi3 has 440cc injectors, good for circa 350bhp.
The next step would be 550's, which are good for circa 400bhp.
As Catxxxxxx said, most of the bigger injectors are for the later fuel rails, and require adapters, which are readily available.
Mark.
Depending on how much power your friend wants, it may be a case of increasing his fuel pressure, using an adjustable reg'.
STi3 has 440cc injectors, good for circa 350bhp.
The next step would be 550's, which are good for circa 400bhp.
As Catxxxxxx said, most of the bigger injectors are for the later fuel rails, and require adapters, which are readily available.
Mark.
Thread Starter
Scooby Newbie
Joined: Aug 2005
Posts: 28
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From: Barbados
Thanks for the info 
Yes, the fuel pump is uprated, but too much of a fuel pressure increase would be needed. I'd say he should have at least 600cc/min for a nice injection duration. To get that on pressure, starting at 40 psi (2.75 bar) base, he would need to increase the pressure to 75 psi (5.2 bar), which means at 20 psi (1.4 bar) boost, he'd have 95 psi (6.5 bar) of fuel pressure, which may be a tad too high
Again, thanks for the info guys, it's appreciated.
Dennis
1990 Toyota Celica GT-Four
2001 Subaru Impreza WRX STi
http://member.newsguy.com/~gtfour
Yes, the fuel pump is uprated, but too much of a fuel pressure increase would be needed. I'd say he should have at least 600cc/min for a nice injection duration. To get that on pressure, starting at 40 psi (2.75 bar) base, he would need to increase the pressure to 75 psi (5.2 bar), which means at 20 psi (1.4 bar) boost, he'd have 95 psi (6.5 bar) of fuel pressure, which may be a tad too high
Again, thanks for the info guys, it's appreciated.
Dennis
1990 Toyota Celica GT-Four
2001 Subaru Impreza WRX STi
http://member.newsguy.com/~gtfour
Scooby Regular
Joined: May 1999
Posts: 2,637
Likes: 0
From: SSO2003 2nd, SSO2005 1st, SSO2006 2nd, TACC Rd4 5th 4wd: In my car ;-)
To get that on pressure, starting at 40 psi (2.75 bar) base, he would need to increase the pressure to 75 psi (5.2 bar), which means at 20 psi (1.4 bar) boost, he'd have 95 psi (6.5 bar) of fuel pressure, which may be a tad too high
This is because you need to take into account the pressure in the intake manifold working against the pressure in the fuel rails.
For reference, the 550's will give circa 580cc at 4 bar fuel pressure.
I believe Power Enterprise do a 660cc, but they are expensive. The next step is either 740's, or modified 550's, which give 800cc.
What power is your friend aiming for, and on what turbo ?
Mark.
Last edited by R19KET; Feb 23, 2006 at 09:16 PM.
