Help plz Fuel VE values seem very unique...
 

I'm wondering if I have my injectors added into mega-squirt the right way. Because my Fuel VE Tables look like they're a bit high overall, especially in the IDLE category -> I'm looking at values of high 90's high 80's and some low 100's for ve fuel values just to keep a stable idle. I haven't found a resource online to teach me how to tune warm up enrichment yet.

Currently, Although I know this is definitely wrong, I was basically using VEAL to get the AFR's looking decent while cruising but when I'm starting the car up and idling, I'm changing VE Table values just to get a decent AFR at idle. but this changes while the car is hot/warm and then of course the next cold start, my AFR is rich as heck. But I'm still learning. Truly trying to take this one step at a time, and stay positive.

I started off with a base tune for a 94-95 1.8L Miata from megasquirtpnp.com

And I followed some of Greg's@TheCarPassionChannel's megasquirt videos to allow me to hook up my 640cc Flow-Force injectors, and get started initially but after his videos, I'm kind of at a loss of resource to keep learning and try to drive the car.

I'm positive the req fuel value i put into settings was right. The injectors are 640cc. And i used what i could find from flowforces website to input the dead time data. But that is all. Something is telling me that there's some other setting I'm not familiar with (since I'm a noob) that should help fix my problem with the high ve fuel values at low rpm low load. Unless that is normal for some cars and i shouldn't be worrying about it then nvm. But here's my afr target table and my ve fuel table.

https://cimg1.ibsrv.net/gimg/www.mia...57505d6df5.jpg
https://cimg3.ibsrv.net/gimg/www.mia...66ffed07fc.jpgDont pay mind to the higher load areas. Im just trying to find out why my low load values are so high to keep a stable afr 14.7:1


Extra note: don't even pay mind to the higher load values of the ve fuel table, because i haven't even began driving/tuning any of those areas. I'm just working on warm up enrichment and idle and low cruise tuning first.

Those higher values are just to start the car right?

it doesnt idle up there?

Did you change the required fuel setting? Also it's easier to just post your tune instead of taking pictures of some screens of it.

That is where it's idling. The car starts up pretty much every time whether hot or cold. But I get different AFR's at idle depending on whether it's hot or cold start, and so That's why I figure I have to do something involving warm up enrichment tuning.
But I don't want to get too heavily involved if I have some type of fundamental settings configured wrong.
I set those values my self in the VE Fuel table in order to stable the AFR during idle. And that's what it took to get the AFR in place. It was leaning way out prior. I'm just concerned if those numbers are way too high. Because I am ready to tune. I just don't want to destroy or over work my new injectors, I'm worried that I might have some type of basic set up configuration incorrect, I figured it'd be smart to ask first if things look correct before moving forward.

I did change the Req Fuel setting. Let me double check. Let me know if this looks right to you guys

https://cimg1.ibsrv.net/gimg/www.mia...237fe601a3.jpgEngine and Sequential Settings (Left)
Injector Dead-time/PWM (Right)

As stated before POST YOUR TUNE.

Oh my mistake I must of over looked that! Here it is.

I started off with a base tune fr 94 95 Miata from megasquirtpnp.com.
Then used TheCarPassionChannel's advice on getting it setup. GM IAT sensor in place of stock air-flow meter. (right about as close as I could get it to throttle body ~12")
I have a AEM wideband installed it is wired into the stock harness O2 signal wire. The calibration is setup properly. 0.01 close accuracy.
The throttle position is calibrated as well.
I made some adjustments to the AFR target table. Definitely not the final draft.
I installed 640cc flow-force injectors. I did the Req Fuel and injector dead times.
Other than that, I have not messed with warm up enrichment or Accel enrichment at all. As I have not yet learned how to. It's still however the base tune had it.

The car ran great on stock ecu prior to this megasquirt installment. I had no vacuum leaks, AFR's were pretty nice. high load = 12.5-13.4, cruise = 14.7-15.1, idle = 14.7=15.4 etc.
But that's about it, if that helps at all.

Post a short log of it idling please.

My VE is 85 at idle and i have 825cc injectors so those numbers aren't shocking to me.

Ok I'm pretty sure it's still relatively warmed up. Be right back.

​​​​​​​Oh yeah? =]

Ya, 83-85 in idle area. 14.5-15.0 afr
​​​​​​​Top end of my map is around 160 ve

This doesnt answer the questions we have which are why it idles with very little vacuum and why the number in that area are so high compared to the rest of the table.

You can half your REQ FUEL and then double all of the fuel table numbers and the car will run the same. Absolute VE numbers arent as important as the shape of the table.

Dann

That's what I kind of had an idea of and figured. Just wasn't sure if it could overwork anything hardware wise in a bad way such as my fuel injectors or whatever, so I was worried. Thanks for the clarification!!

I wanted to say that I haven't driven the car past 3-4k RPM in 1st,2nd,3rd and 4th gear. So I haven't put a heavy enough load on it yet to even get into the upper right territory of the VE Fuel table. It is basically untouched on that part of the map still. I hope to get to it sooner than later though ;) but right now I just wanted to verify my settings are correct and values look reasonable from someone with experience because I don't want to break anything.

But right now I'm running outside to take a quick log of the start up and idle for sombody that requested it. And let me take this moment to thank everybody for their input. Very much appreciated; brb 10mins.

Ok so as I kind of knew would happen. The car's temp had cooled back down, and it ran very rich upon start up. It died twice, I had to input some throttle to get it running. I made sure to get everything in the log though.
As long as it starts up while hot, the current VE Fuel table delivers a good AFR for idle. But upon cold start, or low-warm start, it just runs rich until heated back up.
So I'm assuming I have use warm-up enrichment tuning to get that problem fixed?

Anyhow, here's the log!! It was about 1 and a half minute or so and then I stopped because it was idling so rich. And I only have the free version of Megalogviewer so IDK how long it records for yet. If I had let it continue to heat up, it might've evened out the IDLE AFR but this was only for the purpose of the data log right now anyway.

You said it idles with very little vacuum? How could you tell that? I likely have 1-2 reasons for it. If I knew how you could figure that out, it might help me later on for the idle tuning.

Because you said in that second quote that the high numbers in the VE table are where it's idling. ~86kpa is very little vacuum. Idle should be in the 30-40 range. Check for vacuum leaks.

I'm wondering. Do you have your warm up enrichment dialed in a way so that even tho your AFR is normal @ 83-85 VE Fuel @ operating temp, you still get normal AFR during cold start, and not like way rich or too lean?

Knowing that would probably help me a lot. Because that is a problem I'm having so far, and that is the only way I can understand to fix it with my given power/knowledge thus far.

It starts good at any temp. I just ran auto tune on warmup enrichment once.

Oh ok. I apologize. It wasn't idling that high. It's idling in the ballpark of medium-high 30-40 kpa range.
I think i misinterpreted nitrodann when I answered. I meant originally "was the VE Fuel value supposed to be that high of a number @ idle?"
Not that it was idling high in the kpa or rev range. 1RMDave and nitrodann answered my concern with that question. which was the major question of the thread. :) Sorry for the confusion on my behalf