Please help!!

89LXRagtop · 03-12-2002, 02:30 PM

I'm hoping somebody can help me....Just had a 255lph fuel pump and 30lb injectors installed.. Car runs very badly..Planning on picking up, and installing a vortech MAF calibrated for my injectors tonight.. Will this solve my problem, or do I also need to get an AFR? Thanks in advance for the help!!

Blue Beast · 03-12-2002, 02:49 PM

Definitely a MAF issue...

just out of curiousity...who told you to get 30lb injectors? Do you have a supercharger or nitrous I don't know about...if not...that is probably too much injector for your setup. 24lbs should be right up your alley. They are good to just over 400 hp on a naturally aspirated car.

89LXRagtop · 03-12-2002, 03:56 PM

Thanks for the reply.. I was told by a bunch of people that if I planned future mods, to go with the 30 #'rs to avoid having to do it again. Also, a good posibility of a SC in my future.

juiceman · 03-12-2002, 08:59 PM

a calibrated meter and a afr is recommend, however your car will still run bad since those injectors and pump you have are way too big. unless you have a 10 sec car you dont need that kind of fuel. as for the people who told you to do that ask them how they determined that.where in l.i are you from? out near ronkonkama by any chance?

89LXRagtop · 03-13-2002, 09:59 AM

I'm in Farmingdale..The new maf goes in this afternoon.. I have to make this combo work since I'm outta $$ for the moment

Blue Beast · 03-13-2002, 10:07 AM

Money can be an issue...but doing things right can be very rewarding. I hope the MAF helps enough, but for what you have I wouldn't have gone any bigger than 24lb's...it will cost more to upgrade down the road, but at least your car would be running great until then. Tell me how everything goes.

89LXRagtop · 03-13-2002, 10:19 AM

Thanks.. Got my fingers crossed!

89LXRagtop · 03-14-2002, 11:25 AM

Anybody know what fuel pressure I should be running with my setup? The car seems to run really well with the new MAF..Idles better than it did with the stock pump, inj. and MAF, but, I have no idea what FP I should run now.. Any ideas? Many thanks!!

Blue Beast · 03-14-2002, 11:28 AM

Do you know roughly what HP you are running? With 30lbers I am saying that fuel pressure will probably have to be set pretty low...maybe 38 or 39 pounds...There is a fuel pressure calculator on this web page that should give you a base...and you can work from there.

89LXRagtop · 03-14-2002, 11:39 AM

I was told I should be putting 290-300 hp to the rear wheels.. I don't know how accurate that is, or whether it would be more with the fuel system upgrades. I need to strap it to a dyno, but, shortage of $$ doesn't allow

Blue Beast · 03-14-2002, 11:47 AM

I plugged in your numbers to the calculator and this is what I got...

FUEL SYSTEM ANALYSIS
Total fuel consumption under wide open throttle: 150 lbs/hr
Minimum fuel pump volume required: 90 L/hr
Optimum fuel pump volume required: 108 L/hr
Injector size needed at stock pressure (40 psi): 21 lb/hr
Pressure required on current injectors to simulate needed size: 20 PSI
FMU Required on Current Injectors: N/A
Your current injector status is: OVER INJECTED

See what I mean...with friends like yours, who needs enemys?

89LXRagtop · 03-14-2002, 11:54 AM

Thanks Blue, I appreciate the help....but...........

OUCH!!

Blue Beast · 03-14-2002, 12:04 PM

Even with 24lb injectors the calculator recommends using the stock 19lbers.

FUEL SYSTEM ANALYSIS
Total fuel consumption under wide open throttle: 150 lbs/hr
Minimum fuel pump volume required: 90 L/hr
Optimum fuel pump volume required: 108 L/hr
Injector size needed at stock pressure (40 psi): 21 lb/hr
Pressure required on current injectors to simulate needed size: 32 PSI
FMU Required on Current Injectors: N/A
Your current injector status is: IN THE SAFE ZONE, But it may be better to run a smaller injector using more pressure

My recommendation....buy a supercharger to compensate. lol

89LXRagtop · 03-14-2002, 12:41 PM

Hmm...supercharger..tempting..Know any good banks to rob? Rich people willing to finance my habit? lol...Thanks again.

03-12-2002, 02:30 PM	#1
89LXRagtop Registered Member Join Date: Dec 1999 Location: Farmingdale, NY Posts: 49	Please help!! I'm hoping somebody can help me....Just had a 255lph fuel pump and 30lb injectors installed.. Car runs very badly..Planning on picking up, and installing a vortech MAF calibrated for my injectors tonight.. Will this solve my problem, or do I also need to get an AFR? Thanks in advance for the help!! __________________ 89 LX Notch, world class T-5z, 4:10's, FMS Aluminum DS, Hurst short throw shifter, Motorsport H/D clutch/cable/quadrant, Mac 1 5/8" Long Tubes, Mac Prochamber, Mac flowpath 2.5 cat back, Mac power pullies,TFS Twisted wedge heads, B303 cam, Trick Flow 1.6 Rockers, Comp Cams valve springs, Cobra intake, 255 lph, 30# injectors, Kirban AFPR, Vortech 73mm MAF, BBK 70mm TB, Mac CAI, Eibach Sportlines,Cervini 4" cowl, KB subs, Hotchkis C/C plates, MSD 6AL and more to come..... My Car Domain Pages

03-12-2002, 02:49 PM	#2
Blue Beast Registered Member Join Date: Jul 2001 Location: New Jersey Posts: 47	Definitely a MAF issue... just out of curiousity...who told you to get 30lb injectors? Do you have a supercharger or nitrous I don't know about...if not...that is probably too much injector for your setup. 24lbs should be right up your alley. They are good to just over 400 hp on a naturally aspirated car. __________________ Midnight Blue 89 GT... 306... ported and polished aluminum GT40's, MAC Long tubes, MAC power pipe, Flowmaster 2 1/2 cat back, GT40 intake with ported upper and lower, B-Cam, 24lb injectors, 77mm Mass Air, 65mm TB. World Class T5, 3.73's, Centerforce Dual Friction, FRP aluminum radiator, Victor Jr water pump, Pro 5.0 shifter, Crane adjustable FPR, 255lph fuel pump

03-12-2002, 03:56 PM	#3
89LXRagtop Registered Member Join Date: Dec 1999 Location: Farmingdale, NY Posts: 49	Thanks for the reply.. I was told by a bunch of people that if I planned future mods, to go with the 30 #'rs to avoid having to do it again. Also, a good posibility of a SC in my future. __________________ 89 LX Notch, world class T-5z, 4:10's, FMS Aluminum DS, Hurst short throw shifter, Motorsport H/D clutch/cable/quadrant, Mac 1 5/8" Long Tubes, Mac Prochamber, Mac flowpath 2.5 cat back, Mac power pullies,TFS Twisted wedge heads, B303 cam, Trick Flow 1.6 Rockers, Comp Cams valve springs, Cobra intake, 255 lph, 30# injectors, Kirban AFPR, Vortech 73mm MAF, BBK 70mm TB, Mac CAI, Eibach Sportlines,Cervini 4" cowl, KB subs, Hotchkis C/C plates, MSD 6AL and more to come..... My Car Domain Pages

03-13-2002, 09:59 AM	#5
89LXRagtop Registered Member Join Date: Dec 1999 Location: Farmingdale, NY Posts: 49	I'm in Farmingdale..The new maf goes in this afternoon.. I have to make this combo work since I'm outta $$ for the moment __________________ 89 LX Notch, world class T-5z, 4:10's, FMS Aluminum DS, Hurst short throw shifter, Motorsport H/D clutch/cable/quadrant, Mac 1 5/8" Long Tubes, Mac Prochamber, Mac flowpath 2.5 cat back, Mac power pullies,TFS Twisted wedge heads, B303 cam, Trick Flow 1.6 Rockers, Comp Cams valve springs, Cobra intake, 255 lph, 30# injectors, Kirban AFPR, Vortech 73mm MAF, BBK 70mm TB, Mac CAI, Eibach Sportlines,Cervini 4" cowl, KB subs, Hotchkis C/C plates, MSD 6AL and more to come..... My Car Domain Pages

03-13-2002, 10:07 AM	#6
Blue Beast Registered Member Join Date: Jul 2001 Location: New Jersey Posts: 47	Money can be an issue...but doing things right can be very rewarding. I hope the MAF helps enough, but for what you have I wouldn't have gone any bigger than 24lb's...it will cost more to upgrade down the road, but at least your car would be running great until then. Tell me how everything goes. __________________ Midnight Blue 89 GT... 306... ported and polished aluminum GT40's, MAC Long tubes, MAC power pipe, Flowmaster 2 1/2 cat back, GT40 intake with ported upper and lower, B-Cam, 24lb injectors, 77mm Mass Air, 65mm TB. World Class T5, 3.73's, Centerforce Dual Friction, FRP aluminum radiator, Victor Jr water pump, Pro 5.0 shifter, Crane adjustable FPR, 255lph fuel pump

03-12-2002, 08:59 PM	#4
juiceman Registered Member Join Date: Jan 2001 Location: ny Posts: 197	a calibrated meter and a afr is recommend, however your car will still run bad since those injectors and pump you have are way too big. unless you have a 10 sec car you dont need that kind of fuel. as for the people who told you to do that ask them how they determined that.where in l.i are you from? out near ronkonkama by any chance?

03-13-2002, 10:19 AM	#7
89LXRagtop Registered Member Join Date: Dec 1999 Location: Farmingdale, NY Posts: 49	Thanks.. Got my fingers crossed! __________________ 89 LX Notch, world class T-5z, 4:10's, FMS Aluminum DS, Hurst short throw shifter, Motorsport H/D clutch/cable/quadrant, Mac 1 5/8" Long Tubes, Mac Prochamber, Mac flowpath 2.5 cat back, Mac power pullies,TFS Twisted wedge heads, B303 cam, Trick Flow 1.6 Rockers, Comp Cams valve springs, Cobra intake, 255 lph, 30# injectors, Kirban AFPR, Vortech 73mm MAF, BBK 70mm TB, Mac CAI, Eibach Sportlines,Cervini 4" cowl, KB subs, Hotchkis C/C plates, MSD 6AL and more to come..... My Car Domain Pages

03-14-2002, 11:25 AM	#8
89LXRagtop Registered Member Join Date: Dec 1999 Location: Farmingdale, NY Posts: 49	Anybody know what fuel pressure I should be running with my setup? The car seems to run really well with the new MAF..Idles better than it did with the stock pump, inj. and MAF, but, I have no idea what FP I should run now.. Any ideas? Many thanks!! __________________ 89 LX Notch, world class T-5z, 4:10's, FMS Aluminum DS, Hurst short throw shifter, Motorsport H/D clutch/cable/quadrant, Mac 1 5/8" Long Tubes, Mac Prochamber, Mac flowpath 2.5 cat back, Mac power pullies,TFS Twisted wedge heads, B303 cam, Trick Flow 1.6 Rockers, Comp Cams valve springs, Cobra intake, 255 lph, 30# injectors, Kirban AFPR, Vortech 73mm MAF, BBK 70mm TB, Mac CAI, Eibach Sportlines,Cervini 4" cowl, KB subs, Hotchkis C/C plates, MSD 6AL and more to come..... My Car Domain Pages

03-14-2002, 11:28 AM	#9
Blue Beast Registered Member Join Date: Jul 2001 Location: New Jersey Posts: 47	Do you know roughly what HP you are running? With 30lbers I am saying that fuel pressure will probably have to be set pretty low...maybe 38 or 39 pounds...There is a fuel pressure calculator on this web page that should give you a base...and you can work from there. __________________ Midnight Blue 89 GT... 306... ported and polished aluminum GT40's, MAC Long tubes, MAC power pipe, Flowmaster 2 1/2 cat back, GT40 intake with ported upper and lower, B-Cam, 24lb injectors, 77mm Mass Air, 65mm TB. World Class T5, 3.73's, Centerforce Dual Friction, FRP aluminum radiator, Victor Jr water pump, Pro 5.0 shifter, Crane adjustable FPR, 255lph fuel pump

03-14-2002, 11:39 AM	#10
89LXRagtop Registered Member Join Date: Dec 1999 Location: Farmingdale, NY Posts: 49	I was told I should be putting 290-300 hp to the rear wheels.. I don't know how accurate that is, or whether it would be more with the fuel system upgrades. I need to strap it to a dyno, but, shortage of $$ doesn't allow __________________ 89 LX Notch, world class T-5z, 4:10's, FMS Aluminum DS, Hurst short throw shifter, Motorsport H/D clutch/cable/quadrant, Mac 1 5/8" Long Tubes, Mac Prochamber, Mac flowpath 2.5 cat back, Mac power pullies,TFS Twisted wedge heads, B303 cam, Trick Flow 1.6 Rockers, Comp Cams valve springs, Cobra intake, 255 lph, 30# injectors, Kirban AFPR, Vortech 73mm MAF, BBK 70mm TB, Mac CAI, Eibach Sportlines,Cervini 4" cowl, KB subs, Hotchkis C/C plates, MSD 6AL and more to come..... My Car Domain Pages

03-14-2002, 11:47 AM	#11
Blue Beast Registered Member Join Date: Jul 2001 Location: New Jersey Posts: 47	I plugged in your numbers to the calculator and this is what I got... FUEL SYSTEM ANALYSIS Total fuel consumption under wide open throttle: 150 lbs/hr Minimum fuel pump volume required: 90 L/hr Optimum fuel pump volume required: 108 L/hr Injector size needed at stock pressure (40 psi): 21 lb/hr Pressure required on current injectors to simulate needed size: 20 PSI FMU Required on Current Injectors: N/A Your current injector status is: OVER INJECTED See what I mean...with friends like yours, who needs enemys? __________________ Midnight Blue 89 GT... 306... ported and polished aluminum GT40's, MAC Long tubes, MAC power pipe, Flowmaster 2 1/2 cat back, GT40 intake with ported upper and lower, B-Cam, 24lb injectors, 77mm Mass Air, 65mm TB. World Class T5, 3.73's, Centerforce Dual Friction, FRP aluminum radiator, Victor Jr water pump, Pro 5.0 shifter, Crane adjustable FPR, 255lph fuel pump

03-14-2002, 11:54 AM	#12
89LXRagtop Registered Member Join Date: Dec 1999 Location: Farmingdale, NY Posts: 49	Thanks Blue, I appreciate the help....but........... OUCH!! __________________ 89 LX Notch, world class T-5z, 4:10's, FMS Aluminum DS, Hurst short throw shifter, Motorsport H/D clutch/cable/quadrant, Mac 1 5/8" Long Tubes, Mac Prochamber, Mac flowpath 2.5 cat back, Mac power pullies,TFS Twisted wedge heads, B303 cam, Trick Flow 1.6 Rockers, Comp Cams valve springs, Cobra intake, 255 lph, 30# injectors, Kirban AFPR, Vortech 73mm MAF, BBK 70mm TB, Mac CAI, Eibach Sportlines,Cervini 4" cowl, KB subs, Hotchkis C/C plates, MSD 6AL and more to come..... My Car Domain Pages

03-14-2002, 12:04 PM	#13
Blue Beast Registered Member Join Date: Jul 2001 Location: New Jersey Posts: 47	Even with 24lb injectors the calculator recommends using the stock 19lbers. FUEL SYSTEM ANALYSIS Total fuel consumption under wide open throttle: 150 lbs/hr Minimum fuel pump volume required: 90 L/hr Optimum fuel pump volume required: 108 L/hr Injector size needed at stock pressure (40 psi): 21 lb/hr Pressure required on current injectors to simulate needed size: 32 PSI FMU Required on Current Injectors: N/A Your current injector status is: IN THE SAFE ZONE, But it may be better to run a smaller injector using more pressure My recommendation....buy a supercharger to compensate. lol __________________ Midnight Blue 89 GT... 306... ported and polished aluminum GT40's, MAC Long tubes, MAC power pipe, Flowmaster 2 1/2 cat back, GT40 intake with ported upper and lower, B-Cam, 24lb injectors, 77mm Mass Air, 65mm TB. World Class T5, 3.73's, Centerforce Dual Friction, FRP aluminum radiator, Victor Jr water pump, Pro 5.0 shifter, Crane adjustable FPR, 255lph fuel pump

03-14-2002, 12:41 PM	#14
89LXRagtop Registered Member Join Date: Dec 1999 Location: Farmingdale, NY Posts: 49	Hmm...supercharger..tempting..Know any good banks to rob? Rich people willing to finance my habit? lol...Thanks again. __________________ 89 LX Notch, world class T-5z, 4:10's, FMS Aluminum DS, Hurst short throw shifter, Motorsport H/D clutch/cable/quadrant, Mac 1 5/8" Long Tubes, Mac Prochamber, Mac flowpath 2.5 cat back, Mac power pullies,TFS Twisted wedge heads, B303 cam, Trick Flow 1.6 Rockers, Comp Cams valve springs, Cobra intake, 255 lph, 30# injectors, Kirban AFPR, Vortech 73mm MAF, BBK 70mm TB, Mac CAI, Eibach Sportlines,Cervini 4" cowl, KB subs, Hotchkis C/C plates, MSD 6AL and more to come..... My Car Domain Pages