Wednesday, March 3, 2010

I don't even know what day it is

All I know, I get paid in 10 days and the price of gas went up 10 cents this week.
They must have heard the TA is up and running again!

The car was ready Monday evening, but when I picked it up, it still had issues starting!

It ended up being a pretty quick fix. It apparently still wasn't getting enough fuel during the starting temperatures. (But now we knew it wasn't the faulty fuel pump.)

Don is not the expert on chip burning, that would be his son Kevin. Kevin told Don where to look on the file for low fuel during start up. Don took my chip's program and compared it to one from a similar car. Sure enough, during the start, my car showed significantly lower levels of fuel.

We couldn't remember which file was on this car's chip currently, so we took a program from the most recent chip that he could find, (it was burned during a dyno session in February of last year.) Then he added fuel to the appropriate areas in the file, burned it, and installed it. Voila! The car starts smoothly now.

Now I need to wait until a weekend when there is no rain, and Kevin will hook up a laptop to the computer and the car will tell the laptop exactly what is going on. Then he can fine tune the fuel levels so that the car runs optimally at all speeds.

There are at least 50 variables with tables to adjust, some you don't want to mess with! Perhaps we never even changed the starting fuel level from a stock chip.
Also, sometimes we revert to a stock chip if there were too many changes made.
The new fuel pump changed the fuel ratios, anyway, requiring a new chip.

Maybe I should write these things down! I can't even remember all the parts that have been exchanged in these 9 years. When people ask what's been changed, I say "everything!" and that's the truth.

The sad part is when something starts to malfunction, and I know I've had it happen before, but I just can't remember what it was or how it was fixed!

Finally, after getting the computer chip to perform well on the street, there is a dyno session. On a dyno, the cars can run at full power, simulating a race condition. In a race, the car can (these kind go) 0 to 110 mph in about 11 to 13 seconds. You can't test that on the street.
The car is run on the dyno, and then changes are made to the chip until the air-fuel ratio is optimal and/or no more changes make a difference. Sometimes it takes 3 times and sometimes 5 or 6 runs. The air/fuel ratio is a guideline, but it's not exact for every car.

I've dynoed the car at least 5 times. Usually after a big, new part.

I'm just happy it starts now. That was the biggest thing that kept me from driving it.

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