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Post Info TOPIC: Injector sizing
SteveS


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Injector sizing
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I don't know a lot about injectors, but the pounds do vary by the fuel pressure your running.  I've never had mine dynoed but I hope to be around 500 hp at the crank and the injectors I have are 36# at LS1 fuel pressure (stock LS1 are 28#).  I think the same injector is rated:

30#'s per hour @ 39psi (ford)

32#'s per hour @ 43psi (early GM)

36#'s per hour @ 58psi (LS1)

I ordered mine from fuel injector connection, they were really good to work with and they will buy your old injectors for rebuilding.

http://fuelinjectorconnection.com/shop/index.php

I found the one's I'm running.

http://fuelinjectorconnection.com/shop/index.php?_a=viewProd&productId=237



-- Edited by SteveS on Monday 20th of February 2012 12:53:54 PM

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Steve S. - Fountain, MN

 

1972 Chevelle - 383 stroked LS1/4L60E - SOLD!
67ss


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So all you guys running efi, what horsepower does your engine produce and what lb per hour injectors are you running. I know they have calculators for injector sizing but I wonder how close they really are. Raising fuel pressure will obviously raise flow some as well to make the injector seem bigger.

I am running running 29 lb per hour right now but am upgrading my supercharger and know I am going to need some bigger injectors. I never have dynoed the motor to know what horsepower was previously. But I was thinking of going yo 45 lb per hour injectors at this point. Which based on the injector sizing tables should support something close to 500 crank horsepower.



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Chris P
East Central, Mn

66 Chevelle 300 deluxe
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Chris,

Your assumptions for using a 45 lb injector are sound.

Below is an injection table link. 

With supercharger, that could bump up your BSFC from .52 to .57.  This is at 43.5 psi for fuel pressure.  If you go to the bottom of the page.

500 hp / 8 injerctors = 62.5 hp / injector.

BSFC set to .57

80% duty of a 45 lbs injector = 63.2 hp * 8 = 505.6 hp

95% duty of a 45 lbs injector = 75 hp * 8 = 600 hp

http://users.erols.com/srweiss/tableifc.htm#ITABLE

What pressure are you running at now? 

Does your pump have enough capacity to provide enough fuel without losing the psi?



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John E - Rogers, MN

Instructions? All I need is the exploded view.
70 El Camino soon to be ls1/t56
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67ss


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Mine system is running 43 psi, I am pretty sure my pump is up to the task. What I don't have at this point is an adjustable regulator to modify pressure higher if I need to. That is something I might have to look into, but I am hoping to get injector size close so that I don't need to go there.



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Chris P
East Central, Mn

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That Sy/Ty adjustable regulator would work for you too right? Definately stay away from what I started with.


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Bryan-NW 'burbs
1972 Malibu
Vaguely stock appearing, and the opposite of restored.
1999 std bore 5.7, Vortec heads, Holley Stealth Ram, GM cam
700R4, Viking coilovers, 12 bolt 4.10 posi, and a whole bunch more
Dave Seitz


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Mine is a 383 with 450 HP 465TQ and 36# injectors. You need to look at cycle rate on these I found out, mine are still good for more HP not much.

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67ss


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Well I just pulled the trigger on the injectors, should have them next week. Ordered 46 lb hr so I think I should be pretty safe of not going lean. Will be back on the road for spring though needing some tuning.

gearbanger



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Chris P
East Central, Mn

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Maybe Jim will do a 2-fer deal on dyno tuning at TPIS?

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Bryan-NW 'burbs
1972 Malibu
Vaguely stock appearing, and the opposite of restored.
1999 std bore 5.7, Vortec heads, Holley Stealth Ram, GM cam
700R4, Viking coilovers, 12 bolt 4.10 posi, and a whole bunch more
Lost in the 60s


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67ss wrote:

Well I just pulled the trigger on the injectors, should have them next week. Ordered 46 lb hr so I think I should be pretty safe of not going lean. Will be back on the road for spring though needing some tuning.

gearbanger

There is another guy in St. Paul that Aaron in the Camaro Club swears by and Aaron is extremely picky about his tune.  He bought a "lifetime" tune and can get changes whenever he wants for free.

Get that Camaro going in time for the Club Dyno Day may 5th....nana

 



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Mitch D.   River Falls, WI

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1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

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Lost in the 60s wrote:

 

Get that Camaro going in time for the Club Dyno Day may 5th....nana

 

 I'll have it back together for sure by then. thumbsup



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Chris P
East Central, Mn

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Lost in the 60s wrote:

Get that Camaro going in time for the Club Dyno Day may 5th....nana 

Mitch, I've tried several times to find out if the Camaro club would let us combine our clubs for the dyno event, but haven't heard anything back.  Can you help me with that? 

We didn't have enough to participate last year, but we would if we combined the clubs.  Thanks.



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Stan S.-Twin Cities 'South Metro'

1972 Malibu Convertible 2nd time around 

2001 Mustang GT Convertible 

Forum influenced terms: 'Link Paste', 'Stanitized', & 'Revolving garage door...' 

 
Lost in the 60s


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SShink wrote:
Lost in the 60s wrote:

Get that Camaro going in time for the Club Dyno Day may 5th....nana 

Mitch, I've tried several times to find out if the Camaro club would let us combine our clubs for the dyno event, but haven't heard anything back.  Can you help me with that? 

We didn't have enough to participate last year, but we would if we combined the clubs.  Thanks.

We have an officers meeting next Tuesday and I'll bring it up, but we usually have more cars than time with just the Camaro's...dunno

 



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Mitch D.   River Falls, WI

Lifetime member of the "Cars apart Club"

1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS/RS 350 M20
Chris R


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Lost in the 60s wrote:
SShink wrote:
Lost in the 60s wrote:

Get that Camaro going in time for the Club Dyno Day may 5th....nana 

Mitch, I've tried several times to find out if the Camaro club would let us combine our clubs for the dyno event, but haven't heard anything back.  Can you help me with that? 

We didn't have enough to participate last year, but we would if we combined the clubs.  Thanks.

We have an officers meeting next Tuesday and I'll bring it up, but we usually have more cars than time with just the Camaro's...dunno

 

 Thats what I heard too. Camaro club gets a pretty big turnout at those events and they usually have very little dyno time left for other cars out side of thier club. Which is understandable when your a club that big.

We might be able to work this out with MSMA or something though.



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Chris - Ramsey, MN.

Dear Optimist, Pessimist, and Realist.

While you guys were busy arguing about the glass of water. I drank it!

Sincerly,

The opportunist.
67ss


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Injectors showed up today which is cool and I can start putting things back together. But now I won't be able to get the car out of the garage to put it back in the shed.

angry



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Chris P
East Central, Mn

66 Chevelle 300 deluxe
OscarZ


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Chris you will just need to think of a few other projects to do while it's stuck in the garage.  It's supposed to be 40's possibly 50 next week so the snow won't last too long.



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Michael S. - Cambridge
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67ss


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OscarZ wrote:

Chris you will just need to think of a few other projects to do while it's stuck in the garage.  It's supposed to be 40's possibly 50 next week so the snow won't last too long.

 Mike I sold the engine that is in my buddies 69 chevelle, so I need to get it back in the garage and pulled out. So I am trying to get the camaro back together so I can get it out of the way to do that.



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Chris P
East Central, Mn

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Chris, time to insulate and get some heat in that pole barn so that you can free up the home garage! 



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Stan S.-Twin Cities 'South Metro'

1972 Malibu Convertible 2nd time around 

2001 Mustang GT Convertible 

Forum influenced terms: 'Link Paste', 'Stanitized', & 'Revolving garage door...' 

 
67ss


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SShink wrote:

Chris, time to insulate and get some heat in that pole barn so that you can free up the home garage! 

 Stan you don't know how much I wish I had the money to get that done. I would really just be happy to get some concrete and electricity down there.



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Chris P
East Central, Mn

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67ss wrote:
SShink wrote:

Chris, time to insulate and get some heat in that pole barn so that you can free up the home garage! 

 Stan you don't know how much I wish I had the money to get that done. I would really just be happy to get some concrete and electricity down there.

Chris, we can have a concrete party and mix up a bunch of bags for you!  Maybe BYOB?  Bring Your Own Bag of concrete?  thumbsup

We have a few electricians in the gang as well that could work cheap for beer and burgers.   beers



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Stan S.-Twin Cities 'South Metro'

1972 Malibu Convertible 2nd time around 

2001 Mustang GT Convertible 

Forum influenced terms: 'Link Paste', 'Stanitized', & 'Revolving garage door...' 

 
67ss


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SShink wrote:
Chris, we can have a concrete party and mix up a bunch of bags for you!  Maybe BYOB?  Bring Your Own Bag of concrete?  thumbsup

We have a few electricians in the gang as well that could work cheap for beer and burgers.   beers

 It would be better if it was BYOCT Bring Your Own Concrete Truck to make it go a little faster. But once I get enough stashed away I may be calling for some help from the group.



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Chris P
East Central, Mn

66 Chevelle 300 deluxe
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You know I'll be there, I'll even bring my own shovel.


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Bryan-NW 'burbs
1972 Malibu
Vaguely stock appearing, and the opposite of restored.
1999 std bore 5.7, Vortec heads, Holley Stealth Ram, GM cam
700R4, Viking coilovers, 12 bolt 4.10 posi, and a whole bunch more
Lost in the 60s


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Rent a mini backhoe this summer and we'll trench the wires under ground from the house out there. I did that when I built my shop but I went down 6' and buried a water line too.

 



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Mitch D.   River Falls, WI

Lifetime member of the "Cars apart Club"

1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS/RS 350 M20
67ss


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Lost in the 60s wrote:

Rent a mini backhoe this summer and we'll trench the wires under ground from the house out there. I did that when I built my shop but I went down 6' and buried a water line too.

 

 My thoughts are the same in running water out there when I do the electrical.



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Chris P
East Central, Mn

66 Chevelle 300 deluxe
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