Modifying a 3.2 DME Chip for Race/Street

[Lorenfb]

By replacing the standard 3.2 O2 sensor with a wideband O2 sensor
and reprogramming the fuel maps, the 3.2 DME could be setup to
run optimally for race (AFR = 12.6) and for street emissions (AFR = 14.7).
The modes could be selected via a switch or some special startup sequence.
Another approach would modify the input analog circuits to the DME to set
the wideband O2 reference to be either AFR = 12.6 or 14.7.

The use of the wideband O2 sensor has many possibilities as have been
mentioned on another thread.

[stomachmonkey]

Someone out there is selling a system that let's you run 2 chips and switch between them.

Think Jack has one in his car.

My apologies to the person that came up with it for not remembering who you are thereby not being able to give full credit where it is due.

Scott

[Lorenfb]

That's correct, but it has one 512K EPROM with a chip-select pin to select
one of two 256K memory areas (performance/stock). It doesn't optimize
the AFR for street/race. This is on a Jack's 964 DME unit.

[Jack Olsen]

Yes, it's Ingo's No Bad Days chip.

[bigrubberjeep]

What is the price of a DME (OEM)?

[RickM]

Not cheap. Why? If you need a new one you may want to consider having yours refurbed.

[bigrubberjeep]

Well I have only owned my car for 7 days and it stalled today.
With me not kningh anything I asked what the caus emay have been for my stall this morning at a stop sign, the guy said it may be my DME.

[RickM]

I think he said DME Relay....

[bigrubberjeep]

Sorry - I guess my noobness is even more obivous now. What is the price for the DME relay?

[RickM]

Using the "Search Pelican Parts" above (Hint) I found the DME Relay to be $33 smackers. http://www.pelicanparts.com/catalog/shopcart/911M/POR_911M_fuelMO_pg2.htm#item6

Most recommend having a spare.

[bigrubberjeep]

Do you agree on his diagnosis as a starting point to check?

[Por_sha911]

The DME relay is one of the simplest things to swap out. Find another owner of the same year car and swap with them and take yours for a drive. If it stops stalling, Bingo!
btw, its not a bad idea of have a spare in the glovebox. Our host sells them.

[bigrubberjeep]

True!

[D Hanson]

APR has also sold chips for several years that adjust to different settings. They have the hot mode, normal mode and a Valet mode. Switching is done as follows with the cruise control arm.

Step 1: Press and hold the "set" button on your cruise control. After approximately five seconds, the "check engine" light on your dash will begin to blink once per second. This will tell you that you are activating program one. This blinking sequence will continue for approximately five seconds.

After this five second interval, the "check engine" light will begin blinking twice per second. This will indicate that you have activated the second program. This process is continued to access any remaining programs you may have purchased. (three blinks = program three, four blinks = program four).

Step 2: Once you have activated the desired program, simply release the "set" button. The "check engine" light will go off, and you will be locked in that program until you change it.