RC 550 injector tuning
#1
RC 550 injector tuning
setup:
550RC Injectors
FlyinMiata Turbokit ~8psi
Speeduino w/TunerStudio
I had my car running really good with stock injectors (self tune) but they couldn't keep up at the top of the rev limiter, so I went with the RC500 injectors. After installing them and
updating my required fuel to 5.5 I am getting really weird behavior. I got the car running and turned on auto tune and at idle it cranked the fuel cells down to 1/0 and my AFRs are still <10 but under any load they shot up to 200+ and it is still leaning out. below is my setup, any help would be greatly appreciated!
550RC Injectors
FlyinMiata Turbokit ~8psi
Speeduino w/TunerStudio
I had my car running really good with stock injectors (self tune) but they couldn't keep up at the top of the rev limiter, so I went with the RC500 injectors. After installing them and
updating my required fuel to 5.5 I am getting really weird behavior. I got the car running and turned on auto tune and at idle it cranked the fuel cells down to 1/0 and my AFRs are still <10 but under any load they shot up to 200+ and it is still leaning out. below is my setup, any help would be greatly appreciated!
#3
#7
Where do I go to get them flow tested?
Is having my Required Fuel at 5.5 seem right? (compared to others running a similar setup)
What are dead times and how do I set them?
EDIT: found this post: https://www.miataturbo.net/ecus-tuni...ad-time-56061/
#8
You can find a local source to clean and flowtest injectors. A popular website is FuelInjectorClinic. The issue is... It's $25 per injector which adds up quite a bit. Rather than clean, I'd just buy new ones from somewhere like GoFlowForce.com
https://fuelinjectorclinic.com/
Regarding injectors, they are injector specfic so the ones you find for lets say RX7 injectors are different from what you'll find for RC550. I found this table which included rc550 in the table.
http://www.phearable.net/information...ead-times.html
Regarding where the setting is located, i'm not sure as i don't use TunerStudio. MS is pretty popular so i'm sure you can find documentation online.
To add, i'd fix the deadtime settings before spending any money. Wrong dead time settings can result in bad idling. Also, autotune shouldn't be tuning 'idling' cells.
https://fuelinjectorclinic.com/
Regarding injectors, they are injector specfic so the ones you find for lets say RX7 injectors are different from what you'll find for RC550. I found this table which included rc550 in the table.
http://www.phearable.net/information...ead-times.html
Regarding where the setting is located, i'm not sure as i don't use TunerStudio. MS is pretty popular so i'm sure you can find documentation online.
To add, i'd fix the deadtime settings before spending any money. Wrong dead time settings can result in bad idling. Also, autotune shouldn't be tuning 'idling' cells.
#11
I have spent a lot more time with the car, trying to get something to work.
There are a few things that I can't figure out here:
1. At idle my AFR's sit just above 10:1 no matter if my VE's are at 1 or at 9.
2. It seems to be scaling way to drastically. at idle I'm at 9 and not too much above that I am already up to 50
3. As soon as I dip into boost it is a losing battle. You can see I have it cranked up to 110 and that is still leaning out past my gauge can read.
My fuel constant is set at 6.5. I believe if I crank that number up a little it will fix #2. but it also makes #1 worse. Nothing I do seems to help #3, as soon as I go into boost the engine leans out hard.
Any insight here would be great. I am also looking for someone that could do remote tuning, there aren't any shops or dyno's where I'm at (So. Utah)
There are a few things that I can't figure out here:
1. At idle my AFR's sit just above 10:1 no matter if my VE's are at 1 or at 9.
2. It seems to be scaling way to drastically. at idle I'm at 9 and not too much above that I am already up to 50
3. As soon as I dip into boost it is a losing battle. You can see I have it cranked up to 110 and that is still leaning out past my gauge can read.
My fuel constant is set at 6.5. I believe if I crank that number up a little it will fix #2. but it also makes #1 worse. Nothing I do seems to help #3, as soon as I go into boost the engine leans out hard.
Any insight here would be great. I am also looking for someone that could do remote tuning, there aren't any shops or dyno's where I'm at (So. Utah)
#15
A few things:
1) Don't drive around with such a shitty VE table / advance table. Seriously.
2) Update your speeduino, you're on quite an old version.
3) Do a full reset and then try again.
If after all of this you still can't get it right, you probably just have shitty injectors.
1) Don't drive around with such a shitty VE table / advance table. Seriously.
2) Update your speeduino, you're on quite an old version.
3) Do a full reset and then try again.
If after all of this you still can't get it right, you probably just have shitty injectors.
2) Thanks for this, I didn't even realize it was a thing
3) I ended up just buying some Flow Force 640CC injectors last night. Once I get those and wire them up ill be able to give this another go
#18
UPDATE: I bought FF460 injectors, got them installed and now I am running into some other weird behaviors. The AFR's spike like it will idle fine for a minute, slowly rev higher, and then drop and the AFR's will go out of range. The other weird thing is when I remove the IAT sensor it gets a lot better. I have checked for leaks by spraying starter fluid on all the injectors and the sensor while running, with no noticeable revving. Any ideas??
#19
It sounds like you have a hunting idle. I installed new injectors recently, and as I am tuning it up I occasionally get a set of values that cause a hunting idle.
If you are using closed loop idle control, look at the idle VE table and idle timing table and smooth them out, so that the idle point is a local minimum, instead of on a sadgle point. Also, watch the VE idle table as it hunts, to see which cells it is going to, and how it gets out of control.
If you are not, then the same advice applies to VE table 1.
If you are using closed loop idle control, look at the idle VE table and idle timing table and smooth them out, so that the idle point is a local minimum, instead of on a sadgle point. Also, watch the VE idle table as it hunts, to see which cells it is going to, and how it gets out of control.
If you are not, then the same advice applies to VE table 1.
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