whats the max hp for 50# injectors????
whats the max hp for 50# injectors???? shooting for 620-650 rwhp this weekend and just wondering if they will do it.
ive read other places that they should be good for 800 flywheel so maybe it wont be a problem...
thanks...
ive read other places that they should be good for 800 flywheel so maybe it wont be a problem...
thanks...
Originally Posted by blackz93
shooting for 620-650 rwhp this weekend and just wondering if they will do it.
ive read other places that they should be good for 800 flywheel so maybe it wont be a problem...
thanks...
ive read other places that they should be good for 800 flywheel so maybe it wont be a problem...
thanks...
Injector....Duty Cycle on Injector.....Crank HP.......RWHP (my estimate)
50 Pound........80%.........................580...... .......480-500
50 Pound........90%.........................650...... .......550-570
50 Pound.......100%........................725....... ......625-645
I wouldn't run the injectors any more than 90% of their duty cycle. Forced injection requires a LARGER injector than NA with the same HP requirements. They are some that beleive this chart is conservative but I would go with it myself. 50 pound injectors are the largest HIGH IMPEDANCE injector you can use with the STOCK computer WITHOUT having to use a software driver that will allow you to use the LOW IMPEDANCE injectors. ONCE you start using low impedance injectors however, a FAST system probably is not too far behind!!!
BTW this link is also VERY useful as well:
http://www.robietherobot.com/storm/f...ectorguide.htm
Last edited by sr71bb; Jan 16, 2004 at 05:15 AM.
just FYI, those calculations are assuming...
unless you've got something more than a single intank 340 in the car, you'll be out of pump before you're out of injector. Even with the 42's in there. Been there, done that
- Your fuel pressure is the same at which the injector is rated
- Your maintaining a constant pressure across the injector (ie using a rise rate regulator)
unless you've got something more than a single intank 340 in the car, you'll be out of pump before you're out of injector. Even with the 42's in there. Been there, done that
Originally Posted by y2khawk
just FYI, those calculations are assuming...
unless you've got something more than a single intank 340 in the car, you'll be out of pump before you're out of injector. Even with the 42's in there. Been there, done that
- Your fuel pressure is the same at which the injector is rated
- Your maintaining a constant pressure across the injector (ie using a rise rate regulator)
unless you've got something more than a single intank 340 in the car, you'll be out of pump before you're out of injector. Even with the 42's in there. Been there, done that
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Originally Posted by smokinHawk
largest high impedance injector out there is the 60lb not the 50lb
TECH Fanatic
Joined: Nov 2001
Posts: 1,190
Likes: 0
From: Las Cruces, NM
Based on all my logs (which jive with the calculators) at 80% and a base pressure is 58 psig (and a rising rate regulator) I will be able to get about 570 fwhp (with msd 50, pump is less). A single walbro 340gs stating at 58 psig and pressure going one-to-one with boost will run out about 550 fwhp (probably a little less). If your base pressure is 43 psig then the 340 is going to be worth quite a bit more. Hot wiring or boost a pump gets you little more.
Gary
Gary
Originally Posted by blackz93
even with a boost-a-pump?
I was running a volt-blaster with the alternator putting out close to 17 volts. Enough to cook the bearings outta the alternator
TECH Enthusiast
Joined: Dec 2001
Posts: 553
Likes: 0
From: Columbia, MD
I'm running a single Walbro 340 AND a Vortech T-Rex with 50# injectors.
This combo seems to be working very well for ~530RWHP.
If I spray any nitrous, I'll have to upgrade the fuel rails and fuel lines.
This combo seems to be working very well for ~530RWHP.
If I spray any nitrous, I'll have to upgrade the fuel rails and fuel lines.
TECH Addict
Joined: Nov 2001
Posts: 2,207
Likes: 0
From: College Station, Tx
You can't accurately determine that without knowing what your BSFC is. You can estimate, but every setup will be different.
Also, if you are looking at the MSD 50's, I wouldn't use them - I have tuned them before and do not like them. The siemens 57's would be my choice for big high-z injectors (though I would get a box from LJ/Speed Inc. and run low-z ).
As for pump, I wouldn't mess with aeromotive, weldon, etc (though weldon are definitely top notch - the best you can get, I think they are overkill and even a bit dubious on a street car unless you get the DC controller also to go with them (a must on the street)). Just do 2 intank/inline GSS340's or equivalent. Will support more flow than any of those injectors will, and you get stock reliability and sound level. Plus it's cheaper (especially than weldon).
Also, if you are looking at the MSD 50's, I wouldn't use them - I have tuned them before and do not like them. The siemens 57's would be my choice for big high-z injectors (though I would get a box from LJ/Speed Inc. and run low-z
).As for pump, I wouldn't mess with aeromotive, weldon, etc (though weldon are definitely top notch - the best you can get, I think they are overkill and even a bit dubious on a street car unless you get the DC controller also to go with them (a must on the street)). Just do 2 intank/inline GSS340's or equivalent. Will support more flow than any of those injectors will, and you get stock reliability and sound level. Plus it's cheaper (especially than weldon).
TECH Apprentice
Joined: Apr 2002
Posts: 308
Likes: 0
From: Austin, TX
Humm, I've seen/read about several C5s running a single racetronix intank with a BAP and hitting 650+RWHP without running out of pump. The LPE 427TT also uses a single intank with a BAP. Maybe the c5 fuel sender is the difference.
I agree about the intak comments. The externals are just too loud and unreliable for a street car.
I agree about the intak comments. The externals are just too loud and unreliable for a street car.
TECH Regular
Joined: Nov 2002
Posts: 408
Likes: 0
From: Houston TX (Chicago/Evanston IL)
I have a set of 50# injectors for sale, flowed and never used. 300 Shipped.
Gordon
ruckuss303@aol.com
Gordon
ruckuss303@aol.com
i paid a hundred bux each for my dual walbros in tank. maybe 6 bux worth of rubber hose, 5 bux for band clamps, 7 bux for a relay and 'found' wire at work
grand total is an easy 510lph for < $250.. and nice and quiet too.
fwiw i have the somewhat questionable mototrons in my car now and i'm going to run them 'out' on the new set up before switching to the 83's.
also consider:
https://ls1tech.com/forums/fueling-injection/128238-fuel-flow-line-size-pump-calculator.html
and
https://ls1tech.com/forums/fueling-injection/128515-low-impedance-converter-box-72-injectors.html
grand total is an easy 510lph for < $250.. and nice and quiet too.
fwiw i have the somewhat questionable mototrons in my car now and i'm going to run them 'out' on the new set up before switching to the 83's.
also consider:
https://ls1tech.com/forums/fueling-injection/128238-fuel-flow-line-size-pump-calculator.html
and
https://ls1tech.com/forums/fueling-injection/128515-low-impedance-converter-box-72-injectors.html