Lets talk about fuel injectors
Lets talk about fuel injectors Okay lsx gurus...
I am swapping out my injectors for some ls3 length injectors...
first thought is to get some SD 60lb'ers to replace the ls1 length SD 60s I took out. These would be direct replacement nothing new. They seemed to work fine, but idle and cruise AFR was hard to get to stay steady, did bounce a bit within a few tenths.
2nd thought is LS3/7 stock injectors, but at 42lbs (@3bar), I am not sure it will be enough for my 416 (expecting 550whp range), I really dont want to go above 90% duty cycle
3rd option is LS9 injectors which are 52lb, but the spray pattern is off and could hit the runner/wall, since the manifold sits at a different angle, though i have heard people have used these w/o issue.
4th option is FAST injectors.... though unfamiliar with these and how they perform, but can get 50 lb @4bar or 65lb @4bar...
Anyone have input/experience to share?
I am swapping out my injectors for some ls3 length injectors...
first thought is to get some SD 60lb'ers to replace the ls1 length SD 60s I took out. These would be direct replacement nothing new. They seemed to work fine, but idle and cruise AFR was hard to get to stay steady, did bounce a bit within a few tenths.
2nd thought is LS3/7 stock injectors, but at 42lbs (@3bar), I am not sure it will be enough for my 416 (expecting 550whp range), I really dont want to go above 90% duty cycle
3rd option is LS9 injectors which are 52lb, but the spray pattern is off and could hit the runner/wall, since the manifold sits at a different angle, though i have heard people have used these w/o issue.
4th option is FAST injectors.... though unfamiliar with these and how they perform, but can get 50 lb @4bar or 65lb @4bar...
Anyone have input/experience to share?
Staging Lane
Joined: Dec 2006
Posts: 82
Likes: 0
From: Calgary, Alberta
I was just figuring the very same thing. According to a fuel injector supplier, the formula for fuel injector required is: Horse power (550)x BSFC (use 0.50) divided by # of injectors (8) x .80 duty cycle= 42.9 lbs per hour Looks like 42 lb are going to be good. There is more calc depending on fuel supply pressure but this is close.
I choose the LS9 fro my second round of injectors. Round 1 was ID 1000 with IDC of 38%. I'm hoping for improved atomization thru out as a result.
I'm going with these hoping the spray pattern effect will be trumped by better atomization & good data.
I've also made significant changes to the cylinder heads & hope to see a power.
level increase with a higher than 80% IDC.
Should be back on the dyno in a month for some results.
I'm going with these hoping the spray pattern effect will be trumped by better atomization & good data.
I've also made significant changes to the cylinder heads & hope to see a power.
level increase with a higher than 80% IDC.
Should be back on the dyno in a month for some results.
TECH Resident
Joined: Aug 2003
Posts: 970
Likes: 4
From: England UK
I got myself a set of Racetronix 42LB High Impedence Fuel Injectors which flow at about 48lb/hr at the 58psi(stock rail pressure).
When you do your tuning, you will find you have to tweak the min/inj pulse width to get it to idle correct. Great injectors though, had mine in for about 50-60k miles now.
When you do your tuning, you will find you have to tweak the min/inj pulse width to get it to idle correct. Great injectors though, had mine in for about 50-60k miles now.
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TECH Apprentice
Joined: Feb 2012
Posts: 360
Likes: 3
From: Montreal
I ran LS9 injectors to 600 rwhp. They work perfectly, with perfect idle and low rpm stability. I dont know about the spray pattern but this is off Linginfelters site....
Engine performance and running quality are enhanced through the optimized spray pattern. Unlike competitors “pencil stream” high flow injectors; these High Flow injectors utilize a multi-orifice tip for improved mixture preparation and atomization. This results in lower BSFC and better idle quality than many injectors with less flow.
Have some for sale cheap with a few thousand miles on them.
Engine performance and running quality are enhanced through the optimized spray pattern. Unlike competitors “pencil stream” high flow injectors; these High Flow injectors utilize a multi-orifice tip for improved mixture preparation and atomization. This results in lower BSFC and better idle quality than many injectors with less flow.
Have some for sale cheap with a few thousand miles on them.
LS9 injectors spray at a different angle, due to the way they are placed on the intake from the supercharger. Since the injectors physically sit at a different angle, the spray angle is changed so they still hit the back of the valve. The 'risk' of running an ls9 injector, is the spray pattern angle will cause the fuel to hit the port wall causing destabilization.... though plenty seem to run them w/o issue.
TECH Apprentice
Joined: Feb 2012
Posts: 360
Likes: 3
From: Montreal
LS9 injectors spray at a different angle, due to the way they are placed on the intake from the supercharger. Since the injectors physically sit at a different angle, the spray angle is changed so they still hit the back of the valve. The 'risk' of running an ls9 injector, is the spray pattern angle will cause the fuel to hit the port wall causing destabilization.... though plenty seem to run them w/o issue.
Many people use them with no problems at all. Here is an interesting read on the topic.
http://www.teamzr1.com/ubbthreads/ub...at&Number=4289
FormerVendor
Joined: Nov 2012
Posts: 390
Likes: 0
From: Dyno Tuning in KY
As stated the spray pattern isn't optimal on the LS9 injectors but they do flow more. If you are wanting to have plenty of headroom you could go with those as well. However if you are targeting 80-90% duty cycle the LS3/7 injectors are the ticket. I've tuned a few heads cam LS7's with stock injectors that are making a ton of HP so I wouldn't think you would need more injector with a smaller engine.
