32lb injectors in the ls2
Originally Posted by Spinmonster
Any idea what RWHP these injectors are good for?
I think the FAST and 90mm suck so much air it really taxes the injectors to feed the enhanced airflow. I was fine with 28s prior.
im about to work on a spread sheet that will calculate the injector flow that people can download, did it in thermo class today so from the desired hp you can see the minimum injector to get that will run 80% and feed enough fuel for the engine.
Thread Starter
TECH Enthusiast
Joined: Sep 2003
Posts: 730
Likes: 66
Originally Posted by See5
I am on the 80% line with my setup and SVO36# which flow 42# in a LS1/6.
I think the FAST and 90mm suck so much air it really taxes the injectors to feed the enhanced airflow. I was fine with 28s prior.
I think the FAST and 90mm suck so much air it really taxes the injectors to feed the enhanced airflow. I was fine with 28s prior.
thanks for the response
I will dyno on Sat. I was 401 with mods in sig except ported LS6 heads LS6 intake and Shaner. The intake must be the big factor in fuel demand. All the LS1edit and other calculators said I should be fine with SVO 30s (#36) injectors but I was @92% @5600 rpm. This after tuning and best adjustment of IFR.
Thread Starter
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Joined: Sep 2003
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I never checked my injectors duty cycle. I wouldnt be surprised if that was the limiting factor with my cars top end performance.
The 32lb injectors I am speaking of are the stock size used on the C6. There is no way for me to tune for bigger injectors due to not havng LS2 edit available for injector pulse ect....
I imagine that 440-460would be near 90% duty cycle.
Good post.
The 32lb injectors I am speaking of are the stock size used on the C6. There is no way for me to tune for bigger injectors due to not havng LS2 edit available for injector pulse ect....
I imagine that 440-460would be near 90% duty cycle.
Good post.
Originally Posted by Spinmonster
I never checked my injectors duty cycle. I wouldnt be surprised if that was the limiting factor with my cars top end performance.
The 32lb injectors I am speaking of are the stock size used on the C6. There is no way for me to tune for bigger injectors due to not havng LS2 edit available for injector pulse ect....
I imagine that 440-460would be near 90% duty cycle.
Good post.
The 32lb injectors I am speaking of are the stock size used on the C6. There is no way for me to tune for bigger injectors due to not havng LS2 edit available for injector pulse ect....
I imagine that 440-460would be near 90% duty cycle.
Good post.
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Originally Posted by See5
The LS2 injectors are a dif diameter to fit the LS2 intake. They do not fit well in a LS1/6 intake even with recommended o-ring upgrade. Been there.
Keith
TECH Apprentice
Joined: Jan 2004
Posts: 337
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From: Frisco TX (Dallas Area)
32 pounders (static at 43.5 psi) will support approx 370 rwhp at 80% duty cycle assuming 52-55 psi fuel supply pressure and BSFC of .5 lbs/hp.
Here's the calc (working backwards) if you're interested:
370 whp/.8 drivetrain loss = 462 crank hp
462 chp x .5 bsfc = 231 lb/hr fuel required
231/8 = 29 lb/hr delivered per cylinder (the injector)
29 lb/hr/80% duty cycle = 36 lb/hr injector static flow at 52-55psi fuel pressure.
Square root of (55 psi fuel pressure/43.5 test pressure) = 1.12 flow difference.
36/1.12 = 32 lb/hr injector static flow at 43.5 psi test pressure.
All this changes when you change the BSFC (say to .45), the duty cycle (say to 90%), and the fuel pressure (say to 58 psi).
BTW, here's link to a good calculator:
http://www.rceng.com/technical.htm#WORKSHEET
HTH
Here's the calc (working backwards) if you're interested:
370 whp/.8 drivetrain loss = 462 crank hp
462 chp x .5 bsfc = 231 lb/hr fuel required
231/8 = 29 lb/hr delivered per cylinder (the injector)
29 lb/hr/80% duty cycle = 36 lb/hr injector static flow at 52-55psi fuel pressure.
Square root of (55 psi fuel pressure/43.5 test pressure) = 1.12 flow difference.
36/1.12 = 32 lb/hr injector static flow at 43.5 psi test pressure.
All this changes when you change the BSFC (say to .45), the duty cycle (say to 90%), and the fuel pressure (say to 58 psi).
BTW, here's link to a good calculator:
http://www.rceng.com/technical.htm#WORKSHEET
HTH
