tuning fitech for better gas mileage
hi
my car setup :
impala 77 l6 250 all components is stock (cam intake headers) trans is 350 and final drive ratio is 2.73 with fitech 30003
AFR Targets :
idle : 13.6
1100 45kpa : 14.7
3000 45kpa crouuise : 17
6000 45kpa : 13
others is 12.6
but fuel usage is about 13.3 L/100Km
I got 525 kilometers with 70L gasoline but also with normal speed (100 to 115km)
i have another car and that is nova 79 with 2004r trans and all component is stock (with 1bbl carb)
but this car millage is about 10 to 12
i think my fitech setting is not good and could be better anybody here to help me ?
tnx
The 250 is handicapped from the start because of it's intake and the head port design. Fuel distribution is not balanced whether carbed or EFI. We have a 230 in my Mom's 63 C10 that we have talked about installing a Fitech. I have accepted the fact that the system will not increase the efficiency much unless we do some extensive mods. It will make it more reliable though.
In your case, fuel efficiency may have some room for improvement. As you know fuel efficiency is a mixture of AFR, timing, and volumetric efficiency. At least in the case of the engine. Allthough your quest is a matter of trial and error, and at your own risk, I can give one piece of advise.
Your AFR reading is not calibrated to your engine. The number is simply a scale. I recommend you tune your idle AFR to your plug reading. Find the setting that gives you the best reading at idle and then you have a base line to work from. I usually start by adjusting AFR to vacuum like you would on a carb.
Quote from Austin DeHaas on February 15, 2019, 10:46 amThe 250 is handicapped from the start because of it's intake and the head port design. Fuel distribution is not balanced whether carbed or EFI. We have a 230 in my Mom's 63 C10 that we have talked about installing a Fitech. I have accepted the fact that the system will not increase the efficiency much unless we do some extensive mods. It will make it more reliable though.
oh i forgot to say my head detail
intake valve is 1.84 ex 1.5 and port lumped
but intake is stock with some modifying ...
In your case, fuel efficiency may have some room for improvement. As you know fuel efficiency is a mixture of AFR, timing, and volumetric efficiency. At least in the case of the engine. Allthough your quest is a matter of trial and error, and at your own risk, I can give one piece of advise.
Your AFR reading is not calibrated to your engine. The number is simply a scale. I recommend you tune your idle AFR to your plug reading. Find the setting that gives you the best reading at idle and then you have a base line to work from. I usually start by adjusting AFR to vacuum like you would on a carb.
yeah
but this my engine afr in last night :
https://img.techpowerup.org/190216/screenshot-20190216-134358.png
speed is 100km/h
for plug i'll check
in last night i have drag with that nova i failed very easy !
my car acceleration is very bad with fi tech and head working I thought I'll be the first but i failed vs nova 😐
Check your plugs and send us a datalog. Must use a Dropbox or Cloud link.
Quote from Austin DeHaas on February 16, 2019, 7:24 amCheck your plugs and send us a datalog. Must use a Dropbox or Cloud link.
ok
i did use data log in today but when i remove card from handheld and checked it in my pc i didnt found anything about log
what do i do ?
I answered on your other post. Must plug the handheld into the laptop. But, all of this is wasted until you update your Software.
oh excuse me
please check this topic
https://fitechefituning.com/fitech-efi-tuning-forum-2/topic/stumble-on-fast-acceleration/?part=2
but answer me here
thank so much
Your datalog link will not work. The service you used is corrupted and not secure. I need you to use Dropbox please. Sorry for the inconvenience.
Quote from Austin DeHaas on February 18, 2019, 9:46 amYour datalog link will not work. The service you used is corrupted and not secure. I need you to use Dropbox please. Sorry for the inconvenience.
where are my photos ? i did uploaded many photos but i cant find those !!
so i sent you an email with mediafire link and dropbox share link
but you didnt see that
is this true ?
plz chech it and say me what do i do for fitech setting ...
tnx
We are tying to help you Henry.SS. I need you to help me help you.
If you want to share a Datalog, you must use Dropbox or Cloud to link here. Do not email me with datalogs.
So we are clear, I do not work for Fitech. I built this site so a community could help the community. Emailing me does not help the next user....