How far will 42#ers take me?
Oct 10, 2006 | 12:08 AM
#21
Been working too much lately so I have not given to much thought about it.
Every book I have read, even in the how too ls1 book I have.
Every boosted motor build had 42 lb. injectors and an after market regulator with the fuel pressure set to 80 psi for the tune to make the most horse power.
I know out their on the web is a table for a set of 42 lb. injectors at different fuel pressures.
All I remember about the read was that the higher fuel pressure made the injector shoot out more fuel, tuned for lower cycles and that the steady 80 psi made tuning much easier because it remained constant at all rpm levels.
All of this was well over a year ago when I was hunting for a better set of injectors.
I know because of this I choose the 42 lb ford green tops over the delphi 42 lb blacks.
Every book I have read, even in the how too ls1 book I have.
Every boosted motor build had 42 lb. injectors and an after market regulator with the fuel pressure set to 80 psi for the tune to make the most horse power.
I know out their on the web is a table for a set of 42 lb. injectors at different fuel pressures.
All I remember about the read was that the higher fuel pressure made the injector shoot out more fuel, tuned for lower cycles and that the steady 80 psi made tuning much easier because it remained constant at all rpm levels.
All of this was well over a year ago when I was hunting for a better set of injectors.
I know because of this I choose the 42 lb ford green tops over the delphi 42 lb blacks.
Oct 10, 2006 | 09:20 AM
#23
if you are sure you will need more fuel later why dont you want to step up to the 96's now? i had some 58's? when i switched over to the lowz 96's the truck was actualy easier to tune. it seems like the peek and hold(lowz) injectors are easier to tune and have better control.
i ran my lq4 at 14psi for a long time(about a year with lots of runs). i tried it at 15 and 16psi more than a few times but the turbo was running out of breath at that level and it seemed to like 14psi the best. i had rod bolts, head studs and valve springs in that thing and that was it. dont let it knock and it will run for along time, let it knock and it could die instantly.
i ran my lq4 at 14psi for a long time(about a year with lots of runs). i tried it at 15 and 16psi more than a few times but the turbo was running out of breath at that level and it seemed to like 14psi the best. i had rod bolts, head studs and valve springs in that thing and that was it. dont let it knock and it will run for along time, let it knock and it could die instantly.
Oct 10, 2006 | 09:37 AM
#25
Originally Posted by moregrip
all depends on your setup, my 42's took me to 430rwhp @ 63psi WOT
Same here, i dont have quite 430rwhp, maybe more like 395-400. I have 65psi-68psi @ WOT with 44lb'ers on the stock pump. No problems at all yet for me.
Oct 10, 2006 | 09:45 AM
#26
Originally Posted by parish8
if you are sure you will need more fuel later why dont you want to step up to the 96's now? i had some 58's? when i switched over to the lowz 96's the truck was actualy easier to tune. it seems like the peek and hold(lowz) injectors are easier to tune and have better control.
Oct 10, 2006 | 04:19 PM
#28
Thread Starter
Tin Foil Hat Wearin' Fool
iTrader: (36)
Joined: Oct 2004
Posts: 23,204
Likes: 4
From: Austin, TX
Originally Posted by 1slow01Z71
This the hobbs switch I need?
http://cgi.ebay.com/ebaymotors/Boost...spagenameZWDVW
http://cgi.ebay.com/ebaymotors/Boost...spagenameZWDVW
Oct 10, 2006 | 04:24 PM
#29
Adkoonerstrator
iTrader: (4)
Joined: Nov 2001
Posts: 21,436
Likes: 3
From: Deep in the seedy underworld of Koonerville
Originally Posted by ranwalk
Both my Walbros run all the time. I dont think its nessessary to run a hobbs switch on a return fuel system.
Oct 10, 2006 | 04:28 PM
#30
Originally Posted by TurboBerserker
Do you (or CB) know your peak IDC for those runs? I would love to hear that you are in the 80s with the meth, that would be a kick *** gain from the meth.
You guys run 100% meth, right? Two 15s or a single?
You guys run 100% meth, right? Two 15s or a single?