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adjustable fuel pressure regulator

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Old Dec 24, 2010 | 11:17 PM
  #1  
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From: St louis mo
Car: 1991 z28 Convertable
Engine: Tpi 350
Transmission: 700r4
Axle/Gears: 273 built ten bolt posi
adjustable fuel pressure regulator

i have a adjustable fpr bought used screw is pretty far out i need to know where to have it at i wat it at a step or two above stock for a 5.7 also i have a modified fuel rail with a pressure gauge if that helps on the tuning thanks in advance.
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Old Dec 25, 2010 | 01:28 AM
  #2  
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: adjustable fuel pressure regulator

Originally Posted by IROC_Champion
i have a adjustable fpr bought used.
screw is pretty far out.
i need to know where to have it at.
i wat it at a step or two above stock for a 5.7....
also i have a modified fuel rail with a pressure gauge if that helps on the tuning.
Are not sending a txt message
A fullstop every now and then would make your posts MUCH easier to read

You need stock pressure setting ( 43 -45 psi ) with vac line disconnected and bigger (350 ) injectors

Last edited by vetteoz; Dec 25, 2010 at 01:39 AM.
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Old Dec 25, 2010 | 07:09 AM
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From: Elm City, NC
Car: 87 IROC Z
Engine: 5.7
Transmission: 700R4
Axle/Gears: 3.27
Re: adjustable fuel pressure regulator

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Old Dec 25, 2010 | 11:46 AM
  #4  
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From: Somewhere
Car: 88 IROC
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 10 bolt 3.73
Re: adjustable fuel pressure regulator

Originally Posted by IROC_Champion
i have a adjustable fpr bought used screw is pretty far out i need to know where to have it at i wat it at a step or two above stock for a 5.7 also i have a modified fuel rail with a pressure gauge if that helps on the tuning thanks in advance.
Yikes!! Tech questions are not going to work in that format. A little to much texting for this guy.
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Old Dec 25, 2010 | 03:05 PM
  #5  
IROC_Champion's Avatar
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From: St louis mo
Car: 1991 z28 Convertable
Engine: Tpi 350
Transmission: 700r4
Axle/Gears: 273 built ten bolt posi
Re: adjustable fuel pressure regulator

yea i do text a lot but i definetly dont spend my life in a forum,needed some advice on my car thats all school taught me well,but with that being said you still didnt answer the question cause i asked for the setting above stock.
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Old Dec 25, 2010 | 05:29 PM
  #6  
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: adjustable fuel pressure regulator

Originally Posted by IROC_Champion
you still didnt answer the question
Read bottom of my post above
You need stock pressure setting ( 43 -45 psi ) with vac line disconnected

Your original info / question is very vague.
From your other post about having a flat tappet '89 350 to replace your 305; it looks like you are trying to run a 350 on a 305 tune with 305 injectors by turning up the fuel pressure .You make no mention of having 350 injectors or a 350 chip
You can't run a 350 in your 305 car by just turning up the fuel pressure

Last edited by vetteoz; Dec 25, 2010 at 05:42 PM.
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Old Jan 11, 2011 | 06:29 PM
  #7  
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From: St louis mo
Car: 1991 z28 Convertable
Engine: Tpi 350
Transmission: 700r4
Axle/Gears: 273 built ten bolt posi
Re: adjustable fuel pressure regulator

trust me i have everthing i need chip,under drive pulleys ect some injectors are just out of the question for two pounds less wont make a difference for 600 bucks thats with my discount at advance so i guess im just cheap then.
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Old Jan 11, 2011 | 07:03 PM
  #8  
ASE doc's Avatar
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From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: adjustable fuel pressure regulator

Lb/hr rating is based on 40psi(bosch). Increasing pressure increases output on a linear scale. Therefore, increasing pressure 25%(10psi) will increase injector output 25%(4.75lbs). as far as what works for your engine combo, that you have to figure out for yourself. I would suggest using a wideband O2 AFR meter to check your settings.

Also, running stock, and I assume original injectors in your "stage 3" 350, (what stage 3 means I couldn't begin to guess) is a bad idea. Look at Southbay Injectors for a price on some 22lb/hr Bosch IIIs. Prob about $200
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Old Jan 11, 2011 | 08:16 PM
  #9  
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: adjustable fuel pressure regulator

Originally Posted by IROC_Champion
for 600 bucks thats with my discount at advance
i definetly dont spend my life in a forum.
Need to spend more time learning things on here and not "txt"ing then.
Correct injectors can be had for $170

Do a for injector recommendations; you might be surprised
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Old Jan 23, 2011 | 10:28 PM
  #10  
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From: St louis mo
Car: 1991 z28 Convertable
Engine: Tpi 350
Transmission: 700r4
Axle/Gears: 273 built ten bolt posi
Re: adjustable fuel pressure regulator

incorrect the bosch ones are $98 dollars a peice,and stage 3 was me referring to the prom chip im running
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Old Jan 23, 2011 | 10:34 PM
  #11  
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From: St louis mo
Car: 1991 z28 Convertable
Engine: Tpi 350
Transmission: 700r4
Axle/Gears: 273 built ten bolt posi
Re: adjustable fuel pressure regulator

@vetteoz thanks for the spell check Mr.perfect,but just putting some RANDOM injectors in is out of the question the stock ones were working correctly if you know anything about cars then you should know they have to have the same ohms....now txt that.
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Old Jan 23, 2011 | 11:18 PM
  #12  
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Car: 1985 Camaro Iroc-Z
Engine: LB9
Transmission: 700R4
Axle/Gears: 3.42
Re: adjustable fuel pressure regulator

Bosch III's can indeed be had for less than $600 for a set o.O

2 different companys who sell them have already been mentioned and probably more than 30% of this forum are running injectors from them, So. Nobody is trying to trick you man lol

You've already been told the stock pressure it needs, Why you need a afpr for a stock 350 is beyond me (if it is stock, not much info in this thread), And if 19lb injectors would work on 350's just fine, i dont see why chevrolet even put bigger in the 350's. They're such idiots lol
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Old Jan 23, 2011 | 11:43 PM
  #13  
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: adjustable fuel pressure regulator

Originally Posted by IROC_Champion
if you know anything about cars ..
If you know anything about cars .
Everybody ( except you ) is running the latest design in injectors, not something with 25 year old technology like the OEM Bosch injectors

Originally Posted by IROC_Champion
just putting some RANDOM injectors in is out of the question.
Nothing random about these
http://fuelinjectorconnection.com/sh...&productId=134

Do a search on 3rd Gen and see what guys say after they have fitted them
Also available from Southbay and Injectors Plus

Originally Posted by IROC_Champion
incorrect the bosch ones are $98 dollars a peice,
If you were up with the game plan you would know nobody pays that price

Originally Posted by IROC_Champion
stage 3 was me referring to the prom chip im running
LOL ,
Go over to the 3rd Gen tuning dept and ask what a "stage 3 " chip is
What size injectors is your " stage 3" chip tuned for?

Last edited by vetteoz; Jan 23, 2011 at 11:53 PM.
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Old Jan 24, 2011 | 06:14 AM
  #14  
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Re: adjustable fuel pressure regulator

Originally Posted by IROC_Champion
trust me i have everthing i need chip,under drive pulleys ect some injectors are just out of the question for two pounds less wont make a difference for 600 bucks thats with my discount at advance so i guess im just cheap then.
If you're saying injectors are $600, call me, we do them for well under $200 for the entire set flow matched with a lifetime warranty.

This is hard to follow.
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Old Jan 24, 2011 | 06:15 AM
  #15  
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Re: adjustable fuel pressure regulator

Originally Posted by IROC_Champion
incorrect the bosch ones are $98 dollars a peice,and stage 3 was me referring to the prom chip im running
Vette Oz is right, he usually is. and forget this stage 3 chip crap and underdrive pully. spend your money correctly.
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Old Jan 24, 2011 | 09:46 AM
  #16  
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Re: adjustable fuel pressure regulator

who is selling injectors for $600??? We sell our 22lb bosch lll's for $169.99 a set plus tgo members get
a 10% discount. $600???
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Old Jan 24, 2011 | 11:32 AM
  #17  
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From: ATX
Car: Trans am
Engine: 78 350
Transmission: T56
Axle/Gears: 9 bolt 3.27
Re: adjustable fuel pressure regulator

what AAP part number are you getting for the injectors you're looking at?
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Old Jan 24, 2011 | 08:56 PM
  #18  
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Car: 1993 GMC Typhoon
Engine: 4.3 Turbo
Transmission: 4L60
Axle/Gears: 3.42
Re: adjustable fuel pressure regulator

my head hurts from reading this... can some translate this bull crap?
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Old Jan 24, 2011 | 11:18 PM
  #19  
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From: Somewhere
Car: 88 IROC
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 10 bolt 3.73
Re: adjustable fuel pressure regulator

The guy just wants to know what to set his fuel pressure at for additional performance. I usually set at 46 to 48psi and yield good results. At around 50 PSI I found the injectors will tend to be a bit noisey and the idle quality will start to suffer.
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Old Jan 24, 2011 | 11:30 PM
  #20  
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From: sf bayarea
Car: 91 z28
Engine: 350/ported accel tpi/AFR 195
Transmission: t-5 =(
Axle/Gears: 345
Re: adjustable fuel pressure regulator

Originally Posted by IROC_Champion
@vetteoz thanks for the spell check Mr.perfect,but just putting some RANDOM injectors in is out of the question the stock ones were working correctly if you know anything about cars then you should know they have to have the same ohms....now txt that.
Im a little confused your asking for help and you insult someone with alot of insight on these cars. Being polite goes along way and you will get alot more help on here
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Old Jan 25, 2011 | 01:44 AM
  #21  
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: adjustable fuel pressure regulator

Originally Posted by KiLLJ0Y
my head hurts from reading this... can some translate this bull crap?
Simple
The crux of the problem is he wants to run his 19lb 305 injectors in his new 350 ( "two pounds less wont make a difference" ) by just turning up the fuel pressure

When told he needs 350 injectors for it to run right, his comeback is can't afford new injectors
"bosch ones are $98 dollars a peice,"

Last edited by vetteoz; Jan 25, 2011 at 01:50 AM.
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Old Jan 25, 2011 | 05:50 AM
  #22  
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Re: adjustable fuel pressure regulator

Originally Posted by vetteoz
Simple
The crux of the problem is he wants to run his 19lb 305 injectors in his new 350 ( "two pounds less wont make a difference" ) by just turning up the fuel pressure

When told he needs 350 injectors for it to run right, his comeback is can't afford new injectors
"bosch ones are $98 dollars a peice,"
Thanks for clearing that up....I think.
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Old Feb 3, 2011 | 11:53 PM
  #23  
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From: St louis mo
Car: 1991 z28 Convertable
Engine: Tpi 350
Transmission: 700r4
Axle/Gears: 273 built ten bolt posi
Re: adjustable fuel pressure regulator

everybody always has somthing smart to say so which one of you guys car is actually worth any money??? just asking
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Old Feb 4, 2011 | 12:04 AM
  #24  
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From: sf bayarea
Car: 91 z28
Engine: 350/ported accel tpi/AFR 195
Transmission: t-5 =(
Axle/Gears: 345
Re: adjustable fuel pressure regulator

Well we all dont have stage 3 irocs so im not sure they are worth as much as yours.
Im sure alot of us have alot of time and money in our cars so to each their own ...
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Old Feb 4, 2011 | 12:11 AM
  #25  
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From: St louis mo
Car: 1991 z28 Convertable
Engine: Tpi 350
Transmission: 700r4
Axle/Gears: 273 built ten bolt posi
Re: adjustable fuel pressure regulator

your running a little late thats actually my last years car this wat im putting together now

Last edited by IROC_Champion; Feb 4, 2011 at 12:17 AM. Reason: typo
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Old Feb 4, 2011 | 12:17 AM
  #26  
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From: St louis mo
Car: 1991 z28 Convertable
Engine: Tpi 350
Transmission: 700r4
Axle/Gears: 273 built ten bolt posi
Re: adjustable fuel pressure regulator

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Old Feb 4, 2011 | 01:32 AM
  #27  
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From: sf bayarea
Car: 91 z28
Engine: 350/ported accel tpi/AFR 195
Transmission: t-5 =(
Axle/Gears: 345
Re: adjustable fuel pressure regulator

what is a stage 3 iroc if you dont mind me asking im kind of intrigued
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Old Feb 4, 2011 | 07:29 AM
  #28  
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Re: adjustable fuel pressure regulator

Originally Posted by IROC_Champion
everybody always has somthing smart to say so which one of you guys car is actually worth any money??? just asking
I got over $40K in mine, what's your point?
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Old Feb 4, 2011 | 07:30 AM
  #29  
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Re: adjustable fuel pressure regulator

Originally Posted by IROC_Champion
You can't even get a garage?

Nice looking car BTW..
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Old Feb 4, 2011 | 03:48 PM
  #30  
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From: Pleasant Grove, Utah
Car: 1993 GMC Typhoon
Engine: 4.3 Turbo
Transmission: 4L60
Axle/Gears: 3.42
Re: adjustable fuel pressure regulator

Stage 7 B4C/1LE super vector cross ram TPI here.. thats WITH dual muffler bearings and triple action force fed charge air cooler... $41k invested...
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Old Feb 6, 2011 | 01:46 PM
  #31  
IROC_Champion's Avatar
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From: St louis mo
Car: 1991 z28 Convertable
Engine: Tpi 350
Transmission: 700r4
Axle/Gears: 273 built ten bolt posi
Re: adjustable fuel pressure regulator

you need to do some research http://www.iroc-z.com they have everthing you need to know producton numbers option codes.....just read a little please
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Old Feb 6, 2011 | 01:48 PM
  #32  
IROC_Champion's Avatar
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From: St louis mo
Car: 1991 z28 Convertable
Engine: Tpi 350
Transmission: 700r4
Axle/Gears: 273 built ten bolt posi
Re: adjustable fuel pressure regulator

i just bought this one only had it for three months versus you who probly had your's for several years think about it
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Old Feb 7, 2011 | 03:00 PM
  #33  
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From: Pleasant Grove, Utah
Car: 1993 GMC Typhoon
Engine: 4.3 Turbo
Transmission: 4L60
Axle/Gears: 3.42
Re: adjustable fuel pressure regulator

i love how this guy thinks we are serious...
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Old Feb 8, 2011 | 11:09 AM
  #34  
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From: ATX
Car: Trans am
Engine: 78 350
Transmission: T56
Axle/Gears: 9 bolt 3.27
Re: adjustable fuel pressure regulator

Originally Posted by KiLLJ0Y
WITH dual muffler bearings
so fast even my exhaust has bearings

don't even get me started on my CAI brah get like 5000hp
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