what size injector?
what size injector? Hey guys i'm installing new motor, and not sure what injector size and fuel pump i should use. Here is what I have: Iron 6.0 .40 over, custom Je pistons, lunati probillet rods, head studs, A.R.E. ported ls1 heads that flow 305@ 600 lift (has 2.02 and 1.6 valves) and MS3 cam. Lid, ported throttle body, slp 85 maf, ls6 intake full bolt ons...
Stage II trans with 3200 vig (speed Inc) etc.
I plan on spraying a 250 shot of giggle gas...
I still have 28.8 lbs injectors now, but will 36 or 42 be enough for what I want to do thanks...
Stage II trans with 3200 vig (speed Inc) etc.
I plan on spraying a 250 shot of giggle gas...
I still have 28.8 lbs injectors now, but will 36 or 42 be enough for what I want to do thanks...
Staging Lane
Joined: Apr 2008
Posts: 55
Likes: 0
just remember the rail pressure, really it adds up to your selection. the 28.8 il/hr you have are giving 28.8 lb/hr @ 58 psi, if the pressure is different, the flow rate will be somthing else.
Another thing to consider, the duty cycle, you need injectors that have duty cycle about 70% at WOT and max MAP, and duty cycle of 3~4% at idle.
Another thing to consider, the duty cycle, you need injectors that have duty cycle about 70% at WOT and max MAP, and duty cycle of 3~4% at idle.
injectors will only open/close and operate at such a small pulsewidth/ms, you try and go beyond that and you RUN RICH AT IDLE REGARDLESS OF THE TUNER.
grab you some 42# injectors or the 48# injectors
to give ya an idea
MY STICKY
https://ls1tech.com/forums/fueling-injection/293742-fuel-injector-size-calculator-fuel-pump-chart.html
website:
http://www.rceng.com/technical.aspx
if you need help interrpreting it let me know, I can explain everything.
IF the 42# injectors are rated at 43.5psi...which unless racetronix changed the ratings lately to something else
those 42# injectors ACTUALLY AT 58psi OUR FUEL RAIL PRESSURE
are 48# injectors
and the 48# injectors would be 55# injectors..(these 55# probably a bit much for ya and may idle rich)
so yeh with either of those you are good to 550+ N/A rear wheel horse power EASILY
I HIGHLY DO NOT RECOMMEND BUYING 60# injectors UNLESS YOU ARE MAKING HIGH 6xxHP or HIGHER 700+ rear wheel
to give you an example my friend is running 39# injectors making 480HP and 423TQ N/A
Last edited by ZL1Killa; Jun 1, 2008 at 07:49 AM.
you are honestly the guy(s) screwing quite a few people when they think they can buy 60# injectors and just think they are going to work. you need to evaluate IF they are going to ACTUALLY use all of the injector and NOT IDLE RICH... because they will be back on here asking... oh hell i'm idling rich and my tuner can't get it to not idle rich.. .whats wrong with my tuner who else can i go to and it will be a big fiasco when its the INJECTORS FAULT, and not the tuner.
you are one of the many that gave me a reason to inform people and educate people on injectors and the main reason I have to be all over this section along with helping people with selecting injectors
you are one of the many that gave me a reason to inform people and educate people on injectors and the main reason I have to be all over this section along with helping people with selecting injectors
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Verdad Gallardo you are honestly the guy(s) screwing quite a few people when they think they can buy 60# injectors and just think they are going to work. you need to evaluate IF they are going to ACTUALLY use all of the injector and NOT IDLE RICH... because they will be back on here asking... oh hell i'm idling rich and my tuner can't get it to not idle rich.. .whats wrong with my tuner who else can i go to and it will be a big fiasco when its the INJECTORS FAULT, and not the tuner.
you are one of the many that gave me a reason to inform people and educate people on injectors and the main reason I have to be all over this section along with helping people with selecting injectors
you are one of the many that gave me a reason to inform people and educate people on injectors and the main reason I have to be all over this section along with helping people with selecting injectors
I believe in using the injector that's RIGHT SIZED for the application. Now knowing one would want a little room for growth there is nothing wrong with stepping up a LITTLE.
For most NA 346 ci applications, 36 lb/hr @ 3 bar injectors are plenty adequate with room to grow. For larger ci NA applications, 42 lb/hr @ 3 bar are usually plenty adequate.
Whatever injector you go with, make sure you use one that has some known data points to tune with.
Is 42lbs big enough? Hey guys dont forget I'm also going to spray a 250 shot, will the 42 lbs be enough with my set up. Its gonna be a wet shot. Right now the car made 465 to the wheels on motor...
36 lb/hr injectors @ 3 bar are 41 lb/hr @ 4 bar and will easily support the power you have now. The 42 lb/hr @ 3 bar will be fine also, and allow for more HP in the future.
you are honestly the guy(s) screwing quite a few people when they think they can buy 60# injectors and just think they are going to work. you need to evaluate IF they are going to ACTUALLY use all of the injector and NOT IDLE RICH... because they will be back on here asking... oh hell i'm idling rich and my tuner can't get it to not idle rich.. .whats wrong with my tuner who else can i go to and it will be a big fiasco when its the INJECTORS FAULT, and not the tuner.
you are one of the many that gave me a reason to inform people and educate people on injectors and the main reason I have to be all over this section along with helping people with selecting injectors
you are one of the many that gave me a reason to inform people and educate people on injectors and the main reason I have to be all over this section along with helping people with selecting injectors
On The Tree
Joined: Oct 2005
Posts: 160
Likes: 0
From: PNW
Hey guys i'm installing new motor, and not sure what injector size and fuel pump i should use. Here is what I have: Iron 6.0 .40 over, custom Je pistons, lunati probillet rods, head studs, A.R.E. ported ls1 heads that flow 305@ 600 lift (has 2.02 and 1.6 valves) and MS3 cam. Lid, ported throttle body, slp 85 maf, ls6 intake full bolt ons...
Stage II trans with 3200 vig (speed Inc) etc.
I plan on spraying a 250 shot of giggle gas...
I still have 28.8 lbs injectors now, but will 36 or 42 be enough for what I want to do thanks...
Stage II trans with 3200 vig (speed Inc) etc.
I plan on spraying a 250 shot of giggle gas...
I still have 28.8 lbs injectors now, but will 36 or 42 be enough for what I want to do thanks...
