EIP Stage III E-PROM@2005/01/01 Related Vortex forum
I found the cheap Tuning ROM for my 2.9L VR6 at the EIP Tuning. Stage III Normally Aspirated E-PROM(Designed for cams, exhaust and intake) Its price is $99! Very cheap!
EIP Tuning Stage III Chip.

I ordered in December of last year and it should reach by the Christmas.
I didn't find a reason but this chip was missing for 1.5 months.

I received this chip on last year end.

Then, on New Year's Day....
First, Don't forget the remove the battery terminal, If you don't want to fry the ECU.
Remove weather strip rubber and rain tray from top of firewall.

This rain tray is different from stock one. I exchanged my rain tray to the Golfs rain tray.
The ECU sits on almost the middle of firewall. The ECU is installed in the very small place.
Seemingly, it seems that I can't take out the ECU.

I had to secure the rescue route of ECU. :D
Rescue route
Removing the fresh air duct cover.
Check the space between the fresh air duct cover and the passenger side fender.
Slide out the lock tab of the fresh air dut cover.

The easy way is the tab slide out with pushing down the fresh air duct cover.
After remove the cover.
Secure the route that I rescue ECU.

It seems that I gave the damage to that gasket when I replaced the chip before. See to the bottom right side of the gasket.

Note:
Damaging this gasket will allow rainwater to come into the passenger compartment via the ventilation system. Check Replace the cover gasket page.
Next, Pull the connecter release lever to the front to disconnect the ECU harness.

Note:
Push the lever in until can hear the click sound, when you reconnect the ECU harness. If You don't hear the click sound, the harness will come off while you drive the car.
Like this.
Hold the harness to upper side for next work.
Loosen the 10 mm nut of the ECU frame by the socket wrench with the 15cm extension.

Slide the ECU to the passenger side.
Hold the harness to the upper-side and snaking out the ECU.
The ECU doesn't come out to straight.
Pull out the ECU.
Rescued.

ECU# 021 906 258 B

Note:
Be careful the static electricity will break the EPROM. Discharge the electricity yourself before touching the eprom and the PCB.
Remove the 4 Trox screws on the heatsink of the ECU.
Slide out the circuit board from the black plastic case carefully.
And remove the white plastic insulation shield.
Flip the ECU.
It is my old tuning EPROM which I purchased 10 years ago for 86,000 yen.(about $810?) This ROM have an additional PCB. It seems that the scramble PCB for protect the program stolen.

Note:
Don't pull it out by your finger. The pins of the EPROM is very delicate. It is damaged easily. Why know that? Because, I made the mistake. :-p
Removed the eprom. I recommend use the eprom puller(DIP IC EXTRACTOR: Next picture).

Where is my new ROM? The engine hesitated when I installed the EPROM which I received from them. Why? Did I break the EPROM? They said that EPROM was for Coilpack VR6 when I ask this problem and sent the picture of this EPROM to them. I send back this EPROM to them, and I waited for that right EPROM reached.

As you can imagine, I soldered the old EPROM's pins which broke. :(
2005/02/03
DIP IC Extractor

I bought the DIP IC extractor from the GRID, because I don't want to break the pins of EPROM again.
2005/02/05

Finally, I got the right EPROM.

Did they put their sticker in the box for the apology to me? :D
This EPROM have OBDII 259 VR6 CD SIII label.

Really right chip?
I bought the lever type 28Pin DIP socket with the Extractor. It makes the removal of the EPROM easy.
heh? Didn't I need to buy the Extractor?
Put in the EPROM to the lever DIP socket.

And put in the lever socket with EPROM to the DIP socket of the ECU PCB

The EPROM has the dot and half circle notch. Check that the direction is the same as the original EPROM
Like this!

Reassemble in the reverse order to the firewall.


Note:
After install, Runing the engine at idle speed until the coolant temperature exceeds 70 degrees. Learning should be necessary the ECU.
After install, I heared the different sound before the install from my exhaust.@Probably, It's all in the mind. I drove my corrado around on the neighborhood of the house after the idling. heh? rev limit? The tach needle showed more than 7500rpm. upside down! My valve spring is the stock one! OMG!




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