How Accurate Is The Fuel Injector/Fuel Pressure Calculator?

BowTie Eater 5 Liter · 03-15-2006, 08:18 PM

was playing around on there, and it said with my setup if i was seeing 330ish hp my fuel pressure with 30lbers should be like 28 or so? im running 39psi and i know it is overfueling, but would i be safe down to about 32psi? or is that getting a little too low for a hci setup on 30lbers?

Dark_5.0 · 03-16-2006, 05:25 PM

What are your mods and have you been to the dyno?

Turning down the fuel pressure is your only option unless you are going to pay to get it tuned or buy a TWEECER.

You would be better off downsizing your injectors IMO.

BowTie Eater 5 Liter · 03-16-2006, 08:31 PM

Quote:

Originally Posted by Dark_5.0

What are your mods and have you been to the dyno?

Turning down the fuel pressure is your only option unless you are going to pay to get it tuned or buy a TWEECER.

You would be better off downsizing your injectors IMO.

cant downsize injectors, nitrous to come soon. i know 24lbers NA would be optimum, but with nitrous i should be better off with the 30lbers.

ive got edelbrock 60379 heads, 1.7rr's, crane "e" cam, cobra intake, 70mm t-body, 73mm c&l(matched to the 30lbers), 30lb fms injectors, asjustable regulator, 190lph pump, pulleys, full exhaust, taurus 3 speed fan, blah blah blah, probably lots of little stuff that i forgot, but basically all boltons.

Jeff Chambers · 03-16-2006, 08:36 PM

If your MAF is calibrated to the injectors you don't need to turn down the fuel pressure at all. The computer will only add the fuel it needs for any given amount of airflow.

Dark_5.0 · 03-17-2006, 02:08 PM

Are you going to run a dry or wet nitrous kit?

BowTie Eater 5 Liter · 03-17-2006, 08:39 PM

im going to run a dry kit, dont want to chance fuel puddling in the intake

BowTie Eater 5 Liter · 03-17-2006, 08:50 PM

Quote:

Originally Posted by Jeff Chambers

If your MAF is calibrated to the injectors you don't need to turn down the fuel pressure at all. The computer will only add the fuel it needs for any given amount of airflow.

im running a c&l 73mm, and fp is down to 32, are you saying i should bump it back to 39? will that not cause it to run too rich? i really dont know how the computer works, i know i would be best off to have someone dyno tune it, but i dont have the money for that as of now, so i will have to do what i can myself, please bare with me...

Jeff Chambers · 03-17-2006, 09:30 PM

Turn it back to 39-40 psi. If the injectors and MAF are matched, the computer will only add the amount of fuel necessary to go with the amount of air measured by the MAF.

BowTie Eater 5 Liter · 03-17-2006, 09:56 PM

ok, i will do that tonight, as for clocking, which way should i go? im running a k&n pannel in the stock airbox with the stock tube to the t-body???(my problem is when clocking, i can only go from 12 to 3 because the strut tower brace gets in the way, but i can go from 12 counterclockwise to 3)

Coupe50h · 03-18-2006, 03:03 PM

My friend tried "clocking" his maf, it just slowed him down.

Also, It's too bad your running a c&L 73, the one i had sucked, I couldnt get it to idle right. But thats just my experience.
Another thing, I know a guy spraying a wet 125 shot, he has 30#'s and gets no fuel puddling, just got to make sure everything is working correctly, he did have a big backfire off the line one night, blew his open element filter apart, since then he added a nos delay box, and no more backfires.

Dark_5.0 · 03-18-2006, 03:37 PM

I love my 73mm C&L MAM.

What do your spark plugs like after you have ran the car hard?

BowTie Eater 5 Liter · 03-18-2006, 03:41 PM

Quote:

Originally Posted by Coupe50h

My friend tried "clocking" his maf, it just slowed him down.

Also, It's too bad your running a c&L 73, the one i had sucked, I couldnt get it to idle right. But thats just my experience.
Another thing, I know a guy spraying a wet 125 shot, he has 30#'s and gets no fuel puddling, just got to make sure everything is working correctly, he did have a big backfire off the line one night, blew his open element filter apart, since then he added a nos delay box, and no more backfires.

still not something i want to chance, ive seen guys blow there intakes apart, not worth the risk imo, im only going to be spraying 125 max

03-15-2006, 08:18 PM	#1
BowTie Eater 5 Liter Registered Member Join Date: Nov 2000 Location: Maple Ridge B.C. Canada, The Best Place In The World Posts: 871	How Accurate Is The Fuel Injector/Fuel Pressure Calculator? was playing around on there, and it said with my setup if i was seeing 330ish hp my fuel pressure with 30lbers should be like 28 or so? im running 39psi and i know it is overfueling, but would i be safe down to about 32psi? or is that getting a little too low for a hci setup on 30lbers? __________________ 1984 Bronco II, 36" Michelin Military Tires, 95 EFI 5.0, NP435 Tranny, NP208 Doubler, NP205 Transfer Case, Fill Size Solid Dana 44 Front End, WH Progressive Rate Rock Crawling Coils, Bronco 8.8 Rear, Skyjacker Softride Leafs, 5.13 Gears, Detroit Locker. Final Crawl Ratio Of 175:1 88 GT Best 60ft. 2.181 Best ET 14.350 Best MPH 98.01 ~WRECKED!!!!~

03-16-2006, 05:25 PM	#2
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: How Accurate Is The Fuel Injector/Fuel Pressure Calculator? What are your mods and have you been to the dyno? Turning down the fuel pressure is your only option unless you are going to pay to get it tuned or buy a TWEECER. You would be better off downsizing your injectors IMO. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

03-16-2006, 08:36 PM	#4
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: How Accurate Is The Fuel Injector/Fuel Pressure Calculator? If your MAF is calibrated to the injectors you don't need to turn down the fuel pressure at all. The computer will only add the fuel it needs for any given amount of airflow. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

03-17-2006, 02:08 PM	#5
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: How Accurate Is The Fuel Injector/Fuel Pressure Calculator? Are you going to run a dry or wet nitrous kit? __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

03-17-2006, 08:39 PM	#6
BowTie Eater 5 Liter Registered Member Join Date: Nov 2000 Location: Maple Ridge B.C. Canada, The Best Place In The World Posts: 871	Re: How Accurate Is The Fuel Injector/Fuel Pressure Calculator? im going to run a dry kit, dont want to chance fuel puddling in the intake __________________ 1984 Bronco II, 36" Michelin Military Tires, 95 EFI 5.0, NP435 Tranny, NP208 Doubler, NP205 Transfer Case, Fill Size Solid Dana 44 Front End, WH Progressive Rate Rock Crawling Coils, Bronco 8.8 Rear, Skyjacker Softride Leafs, 5.13 Gears, Detroit Locker. Final Crawl Ratio Of 175:1 88 GT Best 60ft. 2.181 Best ET 14.350 Best MPH 98.01 ~WRECKED!!!!~

03-17-2006, 09:30 PM	#8
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: How Accurate Is The Fuel Injector/Fuel Pressure Calculator? Turn it back to 39-40 psi. If the injectors and MAF are matched, the computer will only add the amount of fuel necessary to go with the amount of air measured by the MAF. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

03-17-2006, 09:56 PM	#9
BowTie Eater 5 Liter Registered Member Join Date: Nov 2000 Location: Maple Ridge B.C. Canada, The Best Place In The World Posts: 871	Re: How Accurate Is The Fuel Injector/Fuel Pressure Calculator? ok, i will do that tonight, as for clocking, which way should i go? im running a k&n pannel in the stock airbox with the stock tube to the t-body???(my problem is when clocking, i can only go from 12 to 3 because the strut tower brace gets in the way, but i can go from 12 counterclockwise to 3) __________________ 1984 Bronco II, 36" Michelin Military Tires, 95 EFI 5.0, NP435 Tranny, NP208 Doubler, NP205 Transfer Case, Fill Size Solid Dana 44 Front End, WH Progressive Rate Rock Crawling Coils, Bronco 8.8 Rear, Skyjacker Softride Leafs, 5.13 Gears, Detroit Locker. Final Crawl Ratio Of 175:1 88 GT Best 60ft. 2.181 Best ET 14.350 Best MPH 98.01 ~WRECKED!!!!~

03-18-2006, 03:03 PM	#10
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Re: How Accurate Is The Fuel Injector/Fuel Pressure Calculator? My friend tried "clocking" his maf, it just slowed him down. Also, It's too bad your running a c&L 73, the one i had sucked, I couldnt get it to idle right. But thats just my experience. Another thing, I know a guy spraying a wet 125 shot, he has 30#'s and gets no fuel puddling, just got to make sure everything is working correctly, he did have a big backfire off the line one night, blew his open element filter apart, since then he added a nos delay box, and no more backfires. __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

03-18-2006, 03:37 PM	#11
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: How Accurate Is The Fuel Injector/Fuel Pressure Calculator? I love my 73mm C&L MAM. What do your spark plugs like after you have ran the car hard? __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

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