Hi All,

I'm programming my ECM. I have pretty stock motor.

I thinking about changing my timing. I'm using tuner cat.

Correct me if i'm wrong please. I'm making some timing curves to help me top end and bottom end.

Step 1. Opening timing table, I've added about 2.5 advance in my lower loads. Opening fuel table, I've added about .38 in my lower loads.

Step 2.Opening timing table, I've added about 1.4 advance in my lower-mid loads. Opening fuel table, I've added about .18 in my lower-mid loads.

Step 3.Opening timing table, I've added about .4 advance in my higher-mid loads. Opening fuel table, I've added about .11 in my higher-mid loads.

Step 4.Opening timing table, I've retarded about .4 in my high loads. Opening fuel table, I've removed about .8 in my higher loads.

Now does this sound like a pretty fair setup? My car seems to run pretty good. Better then the stock table setup. Any inputs?

Thanks in advance

 

U have to verify it by being able to datalog it :-)

What are u using for datalogging?

Any timing or fuel corrections, u can back up by using tesn n tune at the drag strip or a stop watch on back roads.

Also watch the knock sensor and see what it is doing. Too rich can cause knock as wel as too lean or too much timing.

Read the stickies above.

Their is no "wonder cure" tune for a car, they all end up being a little different from one another due to production tolerances.

Have a way to datalog and then away to verfiy it(track/stopwatch).

later
Jeremy

 

Ok, So yeah i don't have a data logger yet. I need to get that really soon for making these changed. So you think i should setup my tables back to stock? i don't really hear any knocking. Maybe stock is safer Huh?

thanks

 

Guess another question is, when people advance there timing and fuel on a stock motor. Is this what people normally do?

 

U need a datalogger, without it your wasting your time , period.

In almost all stock/near stock apps I have had a hand in, to make them run best I usually ended up taking some timing out to reduce knock and pull fuel towards the high midrange thru WOT.

I wouldnt play with things until you understand what u r doing and have a datalogger of some sort.

Moates has free software available for datalogging if u have a cable, which there are also plans for.

later
Jeremy

 

As said by 3.8TransAm before:

As long as you don't do data logging to verify that your changes do any good you have nothing.

There is no rule that you do any better by advancing/retarding your timing/fuel curves by guessing. You HAVE to verify that your engine doesn't knock and will still run good (make power) with the changes you make.

For example: I am running less ignition advance than on the stock chip in the peak torque area of my engine and get a better mileage and more power now. I had never expected this unless I did datalogging that showed me, that I was still getting knock which was retarding my timing and thus robbing power and economy.

Get a notebook and Winaldl and check what your changes are doing to your engine (check if your engine "likes" the changes).

Andreas

 

Cool, ok thanks i'll be running stock timing and fuel then untill i get a datalogger. Thanks for the help everyone.