8.1 Marine Injectors (17113739) What's the deal???
06-29-2016, 04:38 PM
#22
Teching In
Join Date: Jan 2015
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Can't help you much on the non return, but using the stock truck injector info and changing only the IFR worked well. But I was unhappy enough with part throttle tuning that I bought some different injectors with good known data when i switched to the FAST intake. My marine injectors are sitting in a box and are for sale if anyone wants them.
10-25-2016, 09:25 AM
#27
If 50, use these:
Although, I don't know if they are 42 or 44? Seems like it's dependent on the o-ring. I used 44.
The IFR is less important. Just set to something like what I have and tune VE apparently with those injectors.
Code:
47.17 47.51 47.85 48.19 48.52 48.85 49.18 49.51 49.84 50.16 50.48 50.80 51.11 51.43 51.74 52.05 52.36
The IFR is less important. Just set to something like what I have and tune VE apparently with those injectors.
Last edited by JakeFusion; 10-25-2016 at 09:32 AM.
10-25-2016, 09:44 AM
#28
If 50, use these:
Although, I don't know if they are 42 or 44? Seems like it's dependent on the o-ring. I used 44.
The IFR is less important. Just set to something like what I have and tune VE apparently with those injectors.
Code:
47.17 47.51 47.85 48.19 48.52 48.85 49.18 49.51 49.84 50.16 50.48 50.80 51.11 51.43 51.74 52.05 52.36
The IFR is less important. Just set to something like what I have and tune VE apparently with those injectors.
! What numbers did you start with? Just curious on how you scaled them.
10-25-2016, 12:01 PM
#30
Just multiple the entire factory IFR table to get it to match what the new injectors flow at 0 KPA vacuum. And yes, the IFR is very important to have accurate since modifying the VE/MAF throws off your previous airflow and load values. Since they flow 42 lb/hr at 58 psi it's easy to multiply the IFR table correctly since there are no fuel pressure conversions to worry about. Some people list them at 44 but they have been tested to flow around 42.
10-25-2016, 12:37 PM
#31
Just multiple the entire factory IFR table to get it to match what the new injectors flow at 0 KPA vacuum. And yes, the IFR is very important to have accurate since modifying the VE/MAF throws off your previous airflow and load values. Since they flow 42 lb/hr at 58 psi it's easy to multiply the IFR table correctly since there are no fuel pressure conversions to worry about. Some people list them at 44 but they have been tested to flow around 42.
VAC (kPa) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80
Injector Flow (g/sec) 5.317110911 5.350248235 5.38318158 5.415914665 5.448451101 5.480794389 5.512947929 5.544915023 5.576698876 5.608302603 5.639729233 5.670981711 5.702062899 5.732975583 5.763722476 5.794306215 5.824729372
Injector Flow (lb/hr) 42.2 42.46299904 42.72437917 42.98416991 43.24239992 43.49909699 43.75428809 44.00799943 44.26025646 44.5110839 44.76050578 45.00854547 45.2552257 45.50056857 45.74459562 45.98732778 46.22878544
12-12-2016, 09:08 PM
#32
I just ran across an Amazon listing for these injectors. It is the first time I have ever seen any seller post voltage offsets for them. The posted latency offsets are significantly higher than the values in any stock truck tunes I have seen. I will try them and report results, as I have been having some recent issues with idle tuning after a build change.
