l67 fuel injectors @ 43.5pis? whats the Lb/hr? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-10-2009, 03:19 AM   #1
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Default l67 fuel injectors @ 43.5pis? whats the Lb/hr?

https://www.gmforum.com/t274205/

I saw that post, but it seems that the bonnies run a higher psi, then my caprice.

I can ****** some L67 injectors out of some cars from the yard, to fuel my new build.

From my understanding raising or lowering the PSI of an injector changes the fuel rate.


BTW.

bs2
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Old 11-10-2009, 07:38 AM   #2
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That is true, now it depends on what program you use to tune the PCM

In DHP the fuel flow rate was measured in milliseconds/gram (how many milliseconds it takes one gram of fuel to flow)

and in HP Tuners it is Lbs./Hour so just what you know what you are tuning for

what model/year car did they come from? there are slight differences from year to year and car to car
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Old 11-10-2009, 08:27 AM   #3
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L32 is a returnless system, L67 always had a return.
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Old 11-10-2009, 12:18 PM   #4
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I belive the cars I have choices of injectors, (check my junkyard SSEI finds 3 infact)

They range from 96-98 I belive.


The project,

358 gen 1 block (non roller)
SIngle plane EFI Vortec intake converted to FI
Vortec heads
12-771-8 solid roller cam reto.
Headers
Dynomax bullets.

My tunning software uses LB/HR Tuner Pro

Th350
3500 stall
3.23 gears

Should get my big92 caprice wagon up to 12.8s in the 1/4.
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Old 11-10-2009, 12:44 PM   #5
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The L67 injectors are rather large compared to most other cars out there and certainly they are typically larger than most V8'*. If you need larger than the 36lb injectors, Ford Lightenings use 42lb and even larger are available.
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Old 11-10-2009, 12:48 PM   #6
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Naw I dont need them that big, Desktop dyno claims about 461 hp, according to my chart 36 lbs should work, but since its rated at 50 psi, IDK what it would do on 40. (40 is realy where my psi is according to my gauage)

This is being done on a bugdet, my dad is giving me his trans,stall, and heads.

Im just doing the othe parts, cam and intake.
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Old 11-15-2009, 10:44 PM   #7
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Came to the conlcusion why not just get a SSEI FPR?

If it runs at 50psi, Im sure i can run it.

Is the stock FPR boost refferenced? How high can it go?

Any pics of one?

Decided to go to a less radical cam, and a Holley Stealth ram intake.

http://www.summitracing.com/parts/LUN-00012LK/

which is quicker then the other cam and its a hydro flat tappet.

So guys help me out on the fuel.

Last edited by Killerzracing92; 11-15-2009 at 10:48 PM.
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Old 11-15-2009, 10:48 PM   #8
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Here'* a picture.



Not sure on the specks of it. Billboost might have that information.
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Old 11-16-2009, 07:47 PM   #9
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under boost we can see as much as 55+ psi of fuel pressure. Our (ssei) fuel pressure rises 1 psi for every 1lb of Boost
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Old 11-16-2009, 07:52 PM   #10
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Sweeeeeeeeeeettttttttt its BOOST refferenced. Damn I kinda want an SSEI now


Im wondering if I can get away with constant 50 psi, if the injectors are made for it shouldnt be a problem. IDK what my DC will be on the injectors.

What size is the line?

Is it part of the Rail?

Also, it does use a vacum line to determine if its in boost right?
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