SS125

iTrader: (1)

Are there any drawbacks to running in open loop all the time. I have no cats on the car. Finally, would there be a reason to run in open loop at all times. Can it hurt the motor?

Black02SS

iTrader: (36)

No it can't hurt the motor. I have been in open loop now for over a year with no issues. I did this due to the fact my O2's wouldn't get hot enough and switch properly. After countless oxygen sensors and still the same problem, I decided it was time to switch.

DONAIMIAN

iTrader: (18)

Another reason to run open loop is if you have an exhaust leak before the O2's.

soundengineer

iTrader: (16)

The only thing to remember is that your tune...needs to be exactly how you want your car to run....cause in open loop...it IS exactly what it IS....

TAQuickness

iTrader: (28)

That really depends on who tunes it

After working with Black02SS on many itterations of my tune, I happily run OLSD full time. My bird has never run better.

Black02SS

iTrader: (36)

Good to hear that!! And you are correct, it depends on who is doing the tuning.

soundengineer

iTrader: (16)

I'm considering leaving my car in open loop now....
I'm well tuned to a wideband using the 13:1 method...spot dead on.... and I think I want my car to stay dead on
and my MAF is getting tuned the same way....

Torkman15

iTrader: (2)

Me too, no problems and lots of miles a 1/4 mile at a time for about half of em.

Black02SS

iTrader: (36)

If you are going to leave it in open loop, I would suggest tuning the VE table for 14.63 rather then 13:1. You will get better gas mileage and will help more with fumes.

soundengineer

iTrader: (16)

actually you tune it by seting your *edited-said closed-meant open* open loop table to 13:1 and your PE to a ratio of 1.00
then after you are finished tuning with a wideband you set you open loop table back to 14.63 and your PE to 13:1
and If you do Like I'm going to do I'm also going to (here in the near future) tune in lean cruise setings for a little better MPG

qsgto

iTrader: (1)

Closed loop table to 13:1? You mean open loop, right? I'm not really understanding why it should be tuned to 13:1 and then back to 14.63:1. How does that work? If the pcm commands 14.63:1 and is tuned to 13:1, then what are you truely running? Sorry about all the questions, but I'm not fully understanding this.

soundengineer

iTrader: (16)

LOL...yes open loop table..LOL
still not awake yet today..LOL

you tune open loop to a wideband and set it all to 13:1 so you can safely tune your Complete VE at all engine RPM's and Loads.
In open loop it is a direct Multiplier of the VE/MAF and you tune VE with MAF disabled
so IF you get it correct at a multiplier of 1.13 to get 13:1 the hit wil be correct when you reset it to a multiplier of 1 to get 14.63 everywhere...and PE will take car of WOT

very well proven methof of tuning the VE

and IF you Run in Open Loop you can tune in some lean cruising #'s into your VE

HumpinSS

iTrader: (1)

Wrong. This information is flawed. You tune your Open Loop Fuel Air/Table to either 13.0 or 14.6. I can tell you that 13:1 will dig a deep hole in your pockets with rising gas prices. And yuo will see when you set you OLFA table to 14.6 your AFR ERROR WILL be off ask me how I know . Black02SS is a Jedi knight and knows this stuff you arent telling him anything he doesnt know young padawan . If you do like I do, you will set your open loop table to 1.00 like i suggested to you in a previous post. Set your pe table to 1.13 and tune the car the way it will be driven when its all said and done. In the end the PCM and you WB is dividing Actual/Commanded

soundengineer

iTrader: (16)

actually the other day I finished up tuning in my VE with my wideband..using the method I mentioned....
and when I changed the multiplier back to 1(to get 14.63:1) it was dead on
and my WOT was dead on 13:1 as well
(with the obvious slight deviations - 14.8/14.5 as the furthest #'s from 14.63)

I now now need to finish tuning my MAF using the wideband as I am still planning on using it and just running an Open loop Tune and not a completely SD tune

soundengineer

iTrader: (16)

oh...and I'm not doubting that it can be off....but mine was not off

Black02SS

iTrader: (36)

Thats awsome for you sound, but I personally haven't seen a car tuned to 13:0 not have a % of error when adjusted for 14.63. Here is something that I don't understand anymore. Like Humpin said, why tune the car for a way that you aren't going to drive it?

soundengineer

iTrader: (16)

I just looked at the Open loop table..caus eI remembered..I didnt set it to 1.0
I set it back to the stock table....which might be why its spot on....
and I logged just for the hell of it while going to pick up some meds for the kiddos(dam poison Ivy infection) and I did notice that my 15kpa cells were not 14.63.. but the rest were all real dam close except for where PE was starting to blend and where PE was full force

one of the issues I have with commanding 14.7 for tuning is the whole blending PE...
it differers per driver on where PE should start.

shoot me a PM as to your 14.7 method please

HumpinSS

iTrader: (1)

He is running the same way i have suggested you run your OLFA table. Set it to 1.0 and then your pe to 1.13. Set rpm dely to 0 instead of 5500 set pe enable map back to 15 and tune like that.

soundengineer

iTrader: (16)

another question comes into mind...though I have never really questioned it...
why even change the table to 1... why not leave it alone so you have temperature compensation..or why not change it back like I do for the 13.0 method??
I think thats why mine is so close..cause I set it back to stock...not to 1...
stock has all kinds of variances for temperature vs MAP Kpa

HumpinSS

iTrader: (1)

Have you looked at an 03 silvy or 05 CTS-v tune.