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| Steve40th | My LT1 is flowing a tad over 80% duty cycle with 42# Injectors!! | ||
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Elite Guru
 
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At 6200 rpm she is flowing 82% duty cycle with Bosch III 42#'s! Holy heck.
What is your take on this? Heads? They are older CNC inc heads from Florida. They flowed 280 at 550 in, and 180 at 550 ex according to old data. Anyways, rather interesting. I figured going from 30# Fords to Bosch 42's would give me a little more leeway. The 30#'s were going Well into the 90%'s at 6k rpms. Cam is only 544/555 at 230/236 duration. |
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Posted on: 2010/8/7 5:41
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| mseven | Re: My LT1 is flowing a tad over 80% duty cycle with 42# Injectors!! | ||
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Senior Guru
 
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80% is acceptable and I wouldn't consider that a problem.
However, assuming the inj. constant is set around 41.6-41.9 (for a 42#), and inj. pulse width v.s. battery offset add-ons are stock you can still lower the dc without re-tuning CL. There are a few ways that dc can be lowered, and if the tune is good I would tweak a table titled 'PE% change to afr vs. coolant' (depending on availability in the bin/hack). Increasing the percentage there and will lower your dc. from there you will need to tune wot again. |
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Posted on: 2010/8/7 12:56
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| 383tpimachine | Re: My LT1 is flowing a tad over 80% duty cycle with 42# Injectors!! | ||
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Master Guru
 
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I was always told 80-90% is optimal. Better pattern or something.
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Posted on: 2010/8/7 13:36
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| Steve40th | Re: My LT1 is flowing a tad over 80% duty cycle with 42# Injectors!! | ||
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Elite Guru
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Quote:
The injectors constant is set at 42, as they flowed a hair over 42#'s at 43.5 psi. Battery offsets are stock right now. DO they change things allot if messed with? Thanks, STeve |
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Posted on: 2010/8/7 16:54
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| mseven | Re: My LT1 is flowing a tad over 80% duty cycle with 42# Injectors!! | ||
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Senior Guru
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Quote:
Steve40th wrote: The injectors constant is set at 42, as they flowed a hair over 42#'s at 43.5 psi. Depending on how much you change, those numbers they can create dramatic global changes. |
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Posted on: 2010/8/8 1:17
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| Steve40th | Re: My LT1 is flowing a tad over 80% duty cycle with 42# Injectors!! | ||
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Elite Guru
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Quote:
Baby changes then. |
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Posted on: 2010/8/8 5:08
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| mseven | Re: My LT1 is flowing a tad over 80% duty cycle with 42# Injectors!! | ||
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Senior Guru
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Steve,
if you need to add fuel globally "baby steps" there is good, and as long as you are monitoring controlling it should not be a problem. You can also lower the inj.constant from 42.10 to 41.9 which will give a similar global result but not as fine tuneable.(both methods will have an effect on dc). You might want to see if you have the table I mentioned earlier available in your bin, as it is specific to PE fueling percentage add-on. Mick |
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Posted on: 2010/8/8 13:01
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| Steve40th | Re: My LT1 is flowing a tad over 80% duty cycle with 42# Injectors!! | ||
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Quote:
I do have the table you were talking off. |
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Posted on: 2010/8/8 17:31
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| Steve40th | Re: My LT1 is flowing a tad over 80% duty cycle with 42# Injectors!! | ||
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I am trying to borrow a Wideband so I can drive and see how things are really going.
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Posted on: 2010/8/8 17:31
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