AFPR for our cars?
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From: AR
Car: 1991 Camaro RS Vert
Engine: 350 S-TPI
Transmission: T5
Axle/Gears: GU5/G80/J65
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Joined: Dec 2002
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From: Central FL
Car: 91 Camaro
Engine: 3.1...not hardly stock
Transmission: 700r4....not stock either
Axle/Gears: 3.73
Originally posted by Doward
Vortex Performance is thinking of building one. It'd be $65. Anodized red.
Vortex Performance is thinking of building one. It'd be $65. Anodized red.
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From: AR
Car: 1991 Camaro RS Vert
Engine: 350 S-TPI
Transmission: T5
Axle/Gears: GU5/G80/J65
doward=vortec performance.
What he would be doing is maching and outside, with a sealproof screw on the middle to make it adjustable.
What he would be doing is maching and outside, with a sealproof screw on the middle to make it adjustable.
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Joined: Dec 2002
Posts: 2,564
Likes: 1
From: Central FL
Car: 91 Camaro
Engine: 3.1...not hardly stock
Transmission: 700r4....not stock either
Axle/Gears: 3.73
doward AND vortex = vortex performance...his buddy adam, i think is the main one of vortex performance.
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Joined: Aug 2002
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From: Gainesville, FL
Car: 1988 Chevy Camaro Hardtop
Engine: Turbocharged/Intercooled 3.1
Transmission: World Class T5 5 Speed
AM91's correct... Vortex is the 'Vortex' in Vortex Performance... or something like that... LOL
Yeah, ours would be modified stock ones, adjustable, with a completely new diaphragm/spring assembly. Considering the cost of anodizing, it's more a way to get some recognition, than to actually make some money! LOL
The first one will be put on the Turbo mule.... so stay tuned!
Yeah, ours would be modified stock ones, adjustable, with a completely new diaphragm/spring assembly. Considering the cost of anodizing, it's more a way to get some recognition, than to actually make some money! LOL
The first one will be put on the Turbo mule.... so stay tuned!
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Joined: Oct 2003
Posts: 1,668
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From: Houston
Car: 86 Berlinetta 84 MonteCL
Engine: 3.4 MPFI 3.8 229
Transmission: 700r4 T350
From my understanding
)you wont see too many gains at all unless you have some breathing modifications already (cam, headders, exhaust). A motor can't benefit from more fuel until it has more air to burn it. By the way, KED, did you use the 3.4 regulator internals on your swap? I have the whole 3.4 regulator and it's in excellent shape. Skrew it, i'll swap it today, got nothing else to do (except change Sonars fuel pump
)
) 
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Joined: Jan 2001
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From: ****SoCal, USA****
Exactly correct!
Since the 3.4 Fuel Pressure regulator will not "fit" the 2.8 fuel rail, I opened up the 3.4 one & opened the 2.8 one, swapped 3.4 guts into the 2.8 housing & closed up.
This worked perfect.
Incidentially in my swap/upgrade, the rubber diaphram in the 3.4 pressure regulator was in perfect shape & the original 2.8 rubber diaphram was torn.
I was also told I could add a nickle (acting as a shim) to the spring & increse pressure this way.
I mearly placed my 3.4 spring inside the 2.8 housing.
I only did this Fuel pressure regulator swap/upgrade as cheap insurance (meaning the 1995 3.4 stuff was only 10 years younger than my 1985 stuff).
Since the 3.4 Fuel Pressure regulator will not "fit" the 2.8 fuel rail, I opened up the 3.4 one & opened the 2.8 one, swapped 3.4 guts into the 2.8 housing & closed up.
This worked perfect.
Incidentially in my swap/upgrade, the rubber diaphram in the 3.4 pressure regulator was in perfect shape & the original 2.8 rubber diaphram was torn.
I was also told I could add a nickle (acting as a shim) to the spring & increse pressure this way.
I mearly placed my 3.4 spring inside the 2.8 housing.
I only did this Fuel pressure regulator swap/upgrade as cheap insurance (meaning the 1995 3.4 stuff was only 10 years younger than my 1985 stuff).
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Joined: May 2003
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Car: 88 BMW 535i
Engine: 3.5L M30
Transmission: 4HP22E
Re: From my understanding
Originally posted by FbodTrek
)you wont see too many gains at all unless you have some breathing modifications already (cam, headders, exhaust). A motor can't benefit from more fuel until it has more air to burn it. By the way, KED, did you use the 3.4 regulator internals on your swap? I have the whole 3.4 regulator and it's in excellent shape. Skrew it, i'll swap it today, got nothing else to do (except change Sonars fuel pump)
)you wont see too many gains at all unless you have some breathing modifications already (cam, headders, exhaust). A motor can't benefit from more fuel until it has more air to burn it. By the way, KED, did you use the 3.4 regulator internals on your swap? I have the whole 3.4 regulator and it's in excellent shape. Skrew it, i'll swap it today, got nothing else to do (except change Sonars fuel pump
) this is from the Thirdgen.org FAQ section:
Code:
Q: What fuel pressure setting will give me the best performance?
A: The stock setting is 42 PSI. Much track testing has showed that any type of increase will greatly benefit both horse power and torque. Here's some dyno testing on a stock 350 motor which substantiates those claims:
42 PSI (stock) 46 PSI 50 PSI
RPM Torq HP Torq/diff HP/diff Torq/diff HP/diff
------------------------------------------------------------------------
2250 237.7 101.8 254.9/17.2 109.2/ 7.4 275.0/37.3 117.8/16.0
2500 241.7 115.1 262.1/20.4 124.8/ 9.7 283.3/41.6 134.9/19.8
2750 241.5 126.5 275.2/33.7 144.1/17.6 297.0/55.5 155.5/29.0
3000 237.1 135.4 278.2/41.1 158.9/23.5 305.5/68.4 174.5/39.1
3250 233.8 144.7 278.9/45.1 172.6/27.9 311.3/77.5 192.6/47.9
3500 241.0 160.6 278.2/37.2 185.4/24.8 309.5/68.5 206.3/45.7
3750 246.6 176.1 283.4/36.8 202.4/26.8 303.3/56.7 216.6/40.5
4000 250.4 190.7 278.3/27.9 212.0/21.3 298.0/47.6 227.0/36.3
4250 251.6 203.6 272.5/20.9 220.5/16.9 289.1/37.5 233.9/30.3
4500 253.5 217.2 257.3/ 4.2 220.5/ 3.3 277.0/23.5 237.3/20.1
4750 245.0 221.6 242.1/-2.9 219.0/-2.6 266.4/21.4 240.9/19.3
5000 227.6 216.7 225.0/-1.4 214.2/-2.5 237.8/10.2 226.4/ 9.7 Supreme Member
Joined: Aug 2002
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From: Gainesville, FL
Car: 1988 Chevy Camaro Hardtop
Engine: Turbocharged/Intercooled 3.1
Transmission: World Class T5 5 Speed
I don't know about dyno numbers - but I'm hoping to have track numbers from the VP AFPR this weekend, if I ACTUALLY get a Saturday off!
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Joined: Jan 2001
Posts: 7,604
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From: ****SoCal, USA****
I hope your testing bears fruit! In your egine combination, I certainly believe you will see gains.
Not to dump on the stated test results, but a 350 cubic inch sized engine fuel management system will injest "More..." then an engine sized fuel management system of a 217 Cubic Inch (3.4).
Plus to add more "dump", I'd say an engine using 6 cylinders would show "different" results, than an engine using 8 larger cylinders.
NOT Dumping, just throwing out a few other thoughts.
Not to dump on the stated test results, but a 350 cubic inch sized engine fuel management system will injest "More..." then an engine sized fuel management system of a 217 Cubic Inch (3.4).
Plus to add more "dump", I'd say an engine using 6 cylinders would show "different" results, than an engine using 8 larger cylinders.
NOT Dumping, just throwing out a few other thoughts.
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From: AR
Car: 1991 Camaro RS Vert
Engine: 350 S-TPI
Transmission: T5
Axle/Gears: GU5/G80/J65
I am hoping to bump mine up to about 44-45'ish psi.
Found some parts, and its in my welders hands right now. This is modifying a "stock" one also.
Just wish I could get my damn heads back today
Found some parts, and its in my welders hands right now. This is modifying a "stock" one also.
Just wish I could get my damn heads back today
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Joined: Oct 2003
Posts: 1,668
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From: Houston
Car: 86 Berlinetta 84 MonteCL
Engine: 3.4 MPFI 3.8 229
Transmission: 700r4 T350
Dangit!
Mine is spiking at 45 psi right now, problem is I have instant bleedoff . Guess I need to do what we did to Sonars Trans Am last weekend-swap the fuel pump. Apparently I have a leaking check valve or somthing. The Regulator housings are the same too by the way, so are the part numbers on the diaphrams. I used a Dime for a shim....I guess I need another nickel
. Guess I need to do what we did to Sonars Trans Am last weekend-swap the fuel pump. Apparently I have a leaking check valve or somthing. The Regulator housings are the same too by the way, so are the part numbers on the diaphrams. I used a Dime for a shim....I guess I need another nickel TGO Supporter
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From: AR
Car: 1991 Camaro RS Vert
Engine: 350 S-TPI
Transmission: T5
Axle/Gears: GU5/G80/J65
Sure its not your injectors leaking off? Its more commen then fuelpump bleedback.
If you swap pumps, install a camaro v8 one, or corvette pump.
I knew the v8 regulator, and v6 regulator are the same. Just how many v6 guys wish to spend 80-100 bux for an adjustable one vs v8 guys?
If you swap pumps, install a camaro v8 one, or corvette pump.
I knew the v8 regulator, and v6 regulator are the same. Just how many v6 guys wish to spend 80-100 bux for an adjustable one vs v8 guys?
Supreme Member
Joined: Mar 2000
Posts: 13,414
Likes: 6
From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
I have the same thing on my car (pressure drops right to zero), diagnosis with my GM service manual tells me what dale just said- it's a leaking injector. You'd think I'd fix it soon... inspection was last month. (Oops) I'm sticking to driving at night on major highways so I don't get pulled over 
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Joined: Oct 2001
Posts: 8,113
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From: NWOhioToledoArea
Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
Wouldnt a leaky injector show more signs? Wouldn't it get into the oil and thin it down and also smeel of gas? 45 psi is allot of fule to leak out into one cylinder. It should also blow some crap at start up?
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Joined: Oct 2003
Posts: 1,668
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From: Houston
Car: 86 Berlinetta 84 MonteCL
Engine: 3.4 MPFI 3.8 229
Transmission: 700r4 T350
It's not a leaking injector.....
They are good injectors. The same thing was happening when the 2.8 was in the car. There is a check valve that wears out, that's what it is.
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Joined: Mar 2000
Posts: 13,414
Likes: 6
From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
Well, on my car, I went through my GM service manual diagnostic chart, and it told me it wasn't the check valve. Did you run through the chart on your car?
This is out of sequence, but I had to crimp the return line AND feed line closed, so the only "outlet" for fuel pressure was to the injectors- and the pressure still dropped.
I believe it's my CSI since I had sent the 6 injectors out to Rich J at cruzinperformance.com to be cleaned a few years ago, but never sent him the CSI. My car is also hard to start when cold, and always smells rich...
This is out of sequence, but I had to crimp the return line AND feed line closed, so the only "outlet" for fuel pressure was to the injectors- and the pressure still dropped.
I believe it's my CSI since I had sent the 6 injectors out to Rich J at cruzinperformance.com to be cleaned a few years ago, but never sent him the CSI. My car is also hard to start when cold, and always smells rich...
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