Is anyone using open loop fueling for either 0-5V MAF or -10 to 0 psi MAP?

does the car run well? figure you could really lean out hwy cruising etc.

I know most people use closed and open loop, but why not just open loop. UTEC has more than enough resolution for full control as NA.

experiences?

 

i know there was a thread on this where jeremy was tuning his na with it ... can remember the site but a quick search utec parameters will find it .... you would have to use maf open loop.... NA wouldnt be that tought to tune that way ...

 

ya, i have some down time, so i was goin to play with a NA tune tryin MAF based, as the car doesnt run real well without the blower belt on it. And I never take trips with the SC spinning as it KILLS my mileage on the hwy.

I'm goin to have the UTEC take full control from 1400 rpms so that the car can warm up and idle in closed loop.


Its too bad the UTEC doesnt have the param files associated with the tune files. That way you could change your params with your tune, like boost cut, solenoid control etc.

here's the thread https://my350z.com/forum/tuning/1816...ut-utec-9.html

although, with the newer versions of software (V2.8) its a lil different now. I'll have to get used to look at MAF values instead of actual IPW

 

Do you just take the cog belt off when you take trips?

 

sure

 

Dosen't your car go super-rich when you rev higher without the cog belt? What size injectors are you running?

 

^^ of course not. thats what the 0% load column is for when using a speed density map/params. 600cc with a stage 2 CJM return fuel system


argh, you does it have to be 20% minimum for the start of MAF mapping. Why cant it be 0! guess there's no way to have complete control.

also, what value do you guys start at for 'minimum MAF voltage for mapping'. seems like you get better resolution by using a MAF value thats closer to at least the 20% TPS threshold

 

utec is already limited on resolution and if you add vacuum them it will suck ever more. Even if it has 5 maps your open loop parameters will still be the same, it will be nice if you can have a separate parameters for every map but Utec dont offer that. Unless you are thinking of manually reconfiguring your parameters every time you remove your belt. Also why make it difficult, just use close loop for cruising and then use open loop for WOT. 99% of NA guy use close and open loop and it work fine so why make things difficult? The Utec manual also explain tuning MAF Tuning and you can also go to Turboxs to look at one if its MAF base map, it will be tricky coz you are using a bigger injector.

 

yes, i can change my map and params when i take off the belt. takes longer to put the belt on than it does to reload maps. no need to reconfigure params, as you just load the NA specific param file.

ctrl u and enter

The time i;d use this setup would be for 7+ hr car trips. I am tuning for 87 octane and AF of mid 15s for lean gas mileage efficient driving. One drawback is that the UTEC cannot run open loop MAF while using cruise control bc the UTEC sees 0 TPS. Sucks. and using speed density you can control while in cruise control but the resolution of the map sensor under vaccum is not enough. But theres enough control to lean out the 0% column it seems

Its not difficult to set the maps. But the only NA logs i've seen are like 4 or 5000 rpms and up. Mid range tune is what this plan of attack is all about, so those logs are not super helpful.

 

I will take a look at it tonight. I had it set up for na when I took my cog belt off. I have 600cc injectors as well. Pm me if you want and I will give u my email. I would be more than happy to help how ever I can.

 

ya basically i am just interested in what people with NA UTEC setups use for there

min MAF threshold for mapping
rpm threshold for mapping
TPS threshold for mapping

I agree with AthenG, i dont need to recreate the wheel if close to stock values are just fine for resolution and control, when the midrange tuning is really what I am after

 

slowly but shirley its coming together. you really have to scale 600cc injectors to run at 13.5 til 5800 rpms

 

Hey guys,
I'm trying to tune my car NA. and need a little help. I'm running open loop, MAF load control.

So between 2074 and 2152 rpms, the AF jumps almost 2 points. There is a definite stutter in acceleration every time around 2000 rpms, and I assume its the big lean out in AF. I've tried changing the timing and AF in the 2000 and 2250 load sites, but those spots are fine.

In the second chart, again a bounce in AF. I need to smooth that out as well, but cant get the right combo of timing and MAF modification.

I guess this is where I wonder how much resolution do you need? If I went down to a 14 point curve like on a dyno, it would be a pretty flat AFR bc it would skip those few points.

Any suggestions?