what size fuel injectors are on your boosted efi engine??
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what size fuel injectors are on your boosted efi engine??

  1. #1
    Senior Member ap67et10's Avatar
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    Default what size fuel injectors are on your boosted efi engine??

    Im in the process of building my procharged efi deal for my boat. i have a really good idea what size injectors i am planning on running, but am curious to see what other people have done. what size injectors are you running? do you only have 8? what kind of low rpm/idle characteristics are you seeing? how much fuel pressure? and what kind of duty cycle at full boost? and what is the setup you have?

    i'm just trying to get a better idea of, if it would be worth running smaller injectors and adding 2 in the plenum for full throttle, or if i should just go with all 8 fully capable of handling the power i am expecting.

    thanks, AP

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    Highaboosta Unchained's Avatar
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    I run eight 160# injectors @ 45 psi on E85.
    Same injectors I started with 7 seasons ago.
    Motor starts in 1/2 revolution and idles smooth.
    Size the injectors larger than the most hp you would ever need to run.

    I just tuned a FAST XFI Procharged engine in a 25 Daytona and he used eight 120# injectors for 10# boost on E85. Starts good and idles smooth at 850 rpm.

    No need to used any staged injector setup.
    Good deals on injectors on ebay or yellowbullet.com

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

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    Senior Member steveo143's Avatar
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    Hey Mark, I am about to get an intake made for my deal. I thought you said in another thread that those 160's were at 100% duty cycle. I was planning on making the intake to accept 16 injectors. 622 cu. BBC, 2 Y2K 91's, Fast EFI, 16 160# injectors on E85, Lee intercooler. What do you think?
    steveo143 AKA DiMarco 21 II



    Now totally Green on E-85, saving the world one ear of corn at a time!
    RIP Davey B and Denis and Chris and Bob GN7

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    21 Daytona Outlaw's Avatar
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    Mark, is your fuel pressure at 45 all the time?
    I mean your not boost referencing your regulator are you?

    sorry for the jack
    I've got 8 95 lb injectors BTW but have not ran it yet.
    #55

  7. #5
    Senior Member ap67et10's Avatar
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    Quote Originally Posted by Unchained View Post
    I run eight 160# injectors @ 45 psi on E85.
    Same injectors I started with 7 seasons ago.
    Motor starts in 1/2 revolution and idles smooth.
    Size the injectors larger than the most hp you would ever need to run.

    I just tuned a FAST XFI Procharged engine in a 25 Daytona and he used eight 120# injectors for 10# boost on E85. Starts good and idles smooth at 850 rpm.

    No need to used any staged injector setup.
    Good deals on injectors on ebay or yellowbullet.com
    man i wish i could get E85 out here!! I would be all over this if i could get this stuff. would work way better for how much static c/r ill be running. i'll probably have to downsize the pulleys because i'll end up making too much boost with the pulleys that came with my blower but i don't want to run straight race fuel. but E85 would make it all better!! oh well.

    how much more do you factor in for the E85? I know it requires a considerable amount of fuel compared to regular gas. what injectors would you be running if you ran race gas?

    how much boost are you running? and do you happen to know about how much power you are making....if you want to tell everyone.

    Thats great info on the injectors, thanks..i'll be looking around as i will need to pic them up soon. what kind of injectors are you running?

    AP

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    Highaboosta Unchained's Avatar
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    Quote Originally Posted by ap67et10 View Post
    how much more do you factor in for the E85? I know it requires a considerable amount of fuel compared to regular gas. what injectors would you be running if you ran race gas?

    how much boost are you running? and do you happen to know about how much power you are making....if you want to tell everyone.

    Thats great info on the injectors, thanks..i'll be looking around as i will need to pic them up soon. what kind of injectors are you running?

    AP
    I've had boost control issues all year and haven't got it where I want it yet.
    With 60 mm wastegates wide open I was able to get it down to a mere 27# from the 30# it first went to.
    That's where the injectors went to 100% DC and it bent the prop. It's running closed loop so it just adds as much fuel as it can.
    I hate to put out HP estimates because everyone gets their panties all bunched up over that but 100% DC on E85 is around 1900 hp and it was a lean mixture at that. Good thing I only did a 2 second blast the first time. The engine has held up real good for all the overboosting this year.
    It's been on the rev limiter at 7800 rpm so many times I lost count.

    E85 takes 28% - 30% more fuel than gas. It's $ 2.29 / gal here.

    I run 45# base fuel pressure. Vaccum reduces that to 42# and boost adds pressure pound for pound.

    The injectors I have are green on top and say fomoco on the side.

    Steveo, it sounds like a good package but I can't understand using 16 injectors. What are you trying to achieve, 3000 hp ? Can the rest of the package take that ?
    I can email you my FAST fuel maps for a 3 bar MAP sensor. It should be pretty close for eight 160# injectors.

    Everyone always talks about how much HP they want to make and how fast they want to go but once you get there you find it's a scary parts breaker and dangerous to drive around in. I just want to level off at 15 - 20# boost and call it good enough.
    Last edited by Unchained; 07-18-2009 at 02:24 PM.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

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    Senior Member steveo143's Avatar
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    Thanks for the clarification Mark. I don't want to run more than 8 injectors if I don't have to. Would love to be able to use 8 160's @ around $500.00, the 220's are about double in price. I am aiming for 2500hp and the rest of the boat will be able to take it. I will gear the v-drive to keep max rpm around 6200.
    steveo143 AKA DiMarco 21 II



    Now totally Green on E-85, saving the world one ear of corn at a time!
    RIP Davey B and Denis and Chris and Bob GN7

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    Quote Originally Posted by ap67et10 View Post
    Im in the process of building my procharged efi deal for my boat. i have a really good idea what size injectors i am planning on running, but am curious to see what other people have done. what size injectors are you running? do you only have 8? what kind of low rpm/idle characteristics are you seeing? how much fuel pressure? and what kind of duty cycle at full boost? and what is the setup you have?

    i'm just trying to get a better idea of, if it would be worth running smaller injectors and adding 2 in the plenum for full throttle, or if i should just go with all 8 fully capable of handling the power i am expecting.

    thanks, AP
    I have a 540 with twin garrett 4788's with 2 spearco 1000 hp intercoolers side by side.Bosch 160 lb injectors,45 psi @ idle.
    I calculated that @ 2000 hp i'll be @ 88% duty cycle using a middle of the road .057 for the BSFC.


    We need some lots of pictures of your boat and motor.

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    Senior Member ap67et10's Avatar
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    Quote Originally Posted by twntrbo View Post
    I have a 540 with twin garrett 4788's with 2 spearco 1000 hp intercoolers side by side.Bosch 160 lb injectors,45 psi @ idle.
    I calculated that @ 2000 hp i'll be @ 88% duty cycle using a middle of the road .057 for the BSFC.


    We need some lots of pictures of your boat and motor.

    what kind of fuel are you running? thats some major hp right there. let see some pics of the setup.

    i'm in the process of putting the engine together now. should have the block, heads, and rotating assembly back from the balancer and machine shop. but its a 502 bbc, gen4 bowtie tall deck block, pro crank billet 4.0 crank, carrillo rods, je pistons. i have a set of heavily ported (will know the flow numbers this next week) 990's, holley efi intake with 4500 flange and holley 2000 cfm throttle. the real power comes from the F2 procharger i'll be tossin on it. right now its set to put about 14-16lbs of boost at 6000rpm with the engine, but that is what procharger told me. we'll see what it really does. I think it should be around 1100 hp. I was thinking i would run 95lb injectors, which should be plenty for my setup...at least from the number i have run.

    AP

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    I guess i should clear up my previous post.I used 2000 hp for the calculation for the duty cycle %.I'm only running 9#'s of boost right now on pump gas and i don't have the fuel pump to get me their.Doesn't sound like much but with a light boat it's really quick.With my combo i make 100 hp for every # of boost,i'm guessing you could make 1200 to 1300 hp on pump gas easy with a 622 and 91mm ers.
    Are you using the FAST system now?

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    Senior Member s2k1's Avatar
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    Quote Originally Posted by ap67et10 View Post
    man i wish i could get E85 out here!! I would be all over this if i could get this stuff. AP
    Where are you located?
    We buy E85 from Pearson Fuels in San Diego area.
    Chris @ Benchmark Performance

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    Senior Member s2k1's Avatar
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    Quote Originally Posted by steveo143 View Post
    Thanks for the clarification Mark. I don't want to run more than 8 injectors if I don't have to. Would love to be able to use 8 160's @ around $500.00, the 220's are about double in price. I am aiming for 2500hp and the rest of the boat will be able to take it. I will gear the v-drive to keep max rpm around 6200.
    You can also run higher base fuel pressure instead of going with a bigger injector. I run 160 lb injectors on boosted engines at 60 psi base all the time with no problems. You can obviously do this with other injectors too.
    Chris @ Benchmark Performance

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    Highaboosta Unchained's Avatar
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    Quote Originally Posted by s2k1 View Post
    You can also run higher base fuel pressure instead of going with a bigger injector. I run 160 lb injectors on boosted engines at 60 psi base all the time with no problems. You can obviously do this with other injectors too.
    Does the higher pressure compromise your idle quality any ?

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

  16. #14
    Senior Member ap67et10's Avatar
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    Quote Originally Posted by s2k1 View Post
    Where are you located?
    We buy E85 from Pearson Fuels in San Diego area.

    I live in claremont, but I keep my boat up in the central california, fresno area. I searched for placed to get E85 and only found 1 place in LA area and 1 place in Tulare which is about an hour or so from fresno. Other than that, I can't find any other place to get this stuff. My engine i'm building will be going into my Sanger Mini Cruiser, so its not a super hot rod or anything, its a bigger mini cruiser that won't be setting any speed records, just hoping to catch some average lake hot rods off gaurd and have a little fun with a total sleeper. The majority of my boating will be cruising, skiing and an occasional hot lap (I'm known for driving like a grandma...I don't like my dad driving my boat because he has a lead foot). So if I can't get it easily I don't think its going to be worth it for me. I'd be better off running an alcohol or methonal injection on a race fuel blend. i can just get a 50gal drum or av or race fuel if i'm only mixing a 1/4 to 1/2 with pump gas. it will last me a good amount of time that way. i will probably also get some diff. pulleys to run lower boost for straight pump gas.

    however its just slightly depressing to think that if we had it here, i could just pump E85 right into the tanks and run all the boost I want.

    AP

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