Closed loop when throttle on?

[mcancun]

Hi Guys,

This being my first post in all (another member installed a tweecer for me and suggested I go to this site for some information on it)I figure I make it a good one (or try to). I have been tuning myself for about 3 weeks now..doing the normal modifications for the stock j4j1 cobra strategy. The one stump I have now is during datalogging with my tweecerRT I notice the that "closed loop" button (light) lights up when I give the car some gas while in neutral (not driving). Isn't this suppose to be the other way around? I thought open loop was throttle on and closed loop was low load at or during idle??? Perhaps I wasn't giving it enough gas to reach open loop (how do I control it..the load point so I can choose when to go open or closed loop)? I would drive this car down the street and put real load on it to see if it goes open loop, but it is all on secured blocks since I am putting the full front/rear griggs on it.

Anyway..thanks for reading and any information is appreciated. Btw..I can also send my current ccf file or my datalog file if anyone cares to look at it.

 

[Green 94 5.0]

open loop is only forced at full throttle. under part throttle conditions, closed loop will still be used. just out of curiousity, how much boost are you seeing out of the powerdyne? with that same pulley setup and stock heads and intake, i couldnt see over 6psi ever.

 

[mcancun]

I am only seeing 6lbs of boost at the guage and 6-7 at guage mounted in the engine compartment (off of the manifold). How would you force open loop at certain areas of the rpm/load curve? What I am worried about is that closed loop would follow the "fuel_table_base_OL" instead of the "fuel_table_stabilized_OL" table (I am just guessing as I am new to this). I really want to be able to control which fuel tables I am running, but I am assuming open loop follows the stabilized fuel table only and I believe that needs to happen when the car is supercharged and in open loop.

Is there a way to get the tweecer to command open loop at certain rpms or perhaps at certain loads to get the correct fuel table to be run?

Thanks for any information....

 

[mcancun]

ttt

ttt

 

[final5-0]

I am only seeing 6lbs of boost at the guage and 6-7 at guage mounted in the engine compartment (off of the manifold). How would you force open loop at certain areas of the rpm/load curve? What I am worried about is that closed loop would follow the "fuel_table_base_OL" instead of the "fuel_table_stabilized_OL" table (I am just guessing as I am new to this). I really want to be able to control which fuel tables I am running, but I am assuming open loop follows the stabilized fuel table only and I believe that needs to happen when the car is supercharged and in open loop.

Is there a way to get the tweecer to command open loop at certain rpms or perhaps at certain loads to get the correct fuel table to be run?

Thanks for any information....

When in CL, the O2's control the show ... NOT fuel tables

I think it would help you a lot if you forgot tuning for a while
and
did a lot of datalogging keeping good notes.

This will give you an idea about the load, tps, maf volts, OL/CL, etc.

You will want to gather the data while driving under all kinds of conditons.

You setup your WOT fuel ratio with a WB, the upper part of your maf curve which you never see while in CL, and as you have noted ... the OL fuel table.

When you see how the load factors in the tables ... things make much more sense.

I got some basic stuff on my site if you think it might help

Grady