19lb injectors - configuration question
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Joined: Jul 1999
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From: Alberta, Canada
Car: 1989 Camaro-1LE
Engine: TPI(s)
Transmission: 5 speed (MM5, MK6)
Axle/Gears: 3.45, 3.73
19lb injectors - configuration question
When using 19lb injectors on a 350 application, is it better to
A) Up the fuel pressure to 55lbs to make the 19lb act like a 22 lb (assuming the 19lb are strong enough to open against the pressure and still provide adequite flow)
B) Set the prom to use a 19 lb injector for a 350 app and set the pressure back down the the mid 40's?
... Yes I am new to this world of PROM.
Second Question ... at what point will the 19lb injectors be the limiting factor with a modified 350 engine (ZZ3 cam, aluminum heads, ported intake, etc. etc. etc.)
Many thanks for the replys.
Mark.
A) Up the fuel pressure to 55lbs to make the 19lb act like a 22 lb (assuming the 19lb are strong enough to open against the pressure and still provide adequite flow)
B) Set the prom to use a 19 lb injector for a 350 app and set the pressure back down the the mid 40's?
... Yes I am new to this world of PROM.
Second Question ... at what point will the 19lb injectors be the limiting factor with a modified 350 engine (ZZ3 cam, aluminum heads, ported intake, etc. etc. etc.)
Many thanks for the replys.
Mark.
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Joined: Jul 1999
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From: Maryland
Car: 2005 Subaru STI
Engine: 153ci of Turbo Power!
Transmission: 6-Speed
IMHO - this depends on how well your fuel pump can flow at higher pressures and if the injectors can handle higher pressures. If (and only if) your fuel pump can supply enough fuel at 55psi and if your injectors work fine at those pressures then it will be best to bump the pressure up and use a bigger injector constant. It is beneficial to do this because you want to keep your injector duty cycles down and this can only be done by running a higher injector constant (with injectors that actually flow what that constant indicates).
Tim
------------------
TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org
Tim
------------------
TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org
Thread Starter
Supreme Member
Joined: Jul 1999
Posts: 1,466
Likes: 71
From: Alberta, Canada
Car: 1989 Camaro-1LE
Engine: TPI(s)
Transmission: 5 speed (MM5, MK6)
Axle/Gears: 3.45, 3.73
I have flowed my injectors at different flow rates and they max out at 55, rather they showed a non linear growth past 55. The stronger and weaker injectors started to show up past this point.
So I can safely save the injectors are *ok*. The fuel pump I have not tested, although I do want to get a fuel pressure gauge inside the vehicle to monitor. But they ain't cheap.
Mark.
So I can safely save the injectors are *ok*. The fuel pump I have not tested, although I do want to get a fuel pressure gauge inside the vehicle to monitor. But they ain't cheap.
Mark.
Supreme Member
Joined: Jun 2000
Posts: 7,554
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by Mark_ZZ3:
When using 19lb injectors on a 350 application, is it better to
A) Up the fuel pressure to 55lbs to make the 19lb act like a 22 lb (assuming the 19lb are strong enough to open against the pressure and still provide adequite flow)
B) Set the prom to use a 19 lb injector for a 350 app and set the pressure back down the the mid 40's?
... Yes I am new to this world of PROM.
Second Question ... at what point will the 19lb injectors be the limiting factor with a modified 350 engine (ZZ3 cam, aluminum heads, ported intake, etc. etc. etc.)
Many thanks for the replys.
Mark.</font>
When using 19lb injectors on a 350 application, is it better to
A) Up the fuel pressure to 55lbs to make the 19lb act like a 22 lb (assuming the 19lb are strong enough to open against the pressure and still provide adequite flow)
B) Set the prom to use a 19 lb injector for a 350 app and set the pressure back down the the mid 40's?
... Yes I am new to this world of PROM.
Second Question ... at what point will the 19lb injectors be the limiting factor with a modified 350 engine (ZZ3 cam, aluminum heads, ported intake, etc. etc. etc.)
Many thanks for the replys.
Mark.</font>
Thread Starter
Supreme Member
Joined: Jul 1999
Posts: 1,466
Likes: 71
From: Alberta, Canada
Car: 1989 Camaro-1LE
Engine: TPI(s)
Transmission: 5 speed (MM5, MK6)
Axle/Gears: 3.45, 3.73
Yes I saw the thread on injectors AFTER I posted ... doh!
I believe it is safe to say that I will need larger injectors than what I have, if I expect to achieve a higher HP level. Now the question of 22's, 24's or 30's come in. I would guess 24's, but I will know more after I dwell into the programming a bit more.
Mark.
I believe it is safe to say that I will need larger injectors than what I have, if I expect to achieve a higher HP level. Now the question of 22's, 24's or 30's come in. I would guess 24's, but I will know more after I dwell into the programming a bit more.
Mark.
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