Question Regarding Installation

ninjanick · Post by **ninjanick** » Fri Aug 01, 2003 11:29 am

I'm about to buy a used Stage 4 with the hopes of learning/starting to tune (at a cheaper initial price) and eventually upgrading to an S200. What I'm interested in are the components that install into the ECU. I've got a P72 ODB-I ECU.

1. Is there a specific D-latch chip that I should buy? The 74HC373 chip has multiple vendors and configurations. I'm assuming 20-pin DIP, but most of the ones I find are 6V max. Should it run on 12V? Or is there a step down converter on the ECU main board?
2. The ceramic 0.1uF caps can be any voltage range? Or should they be above a certain voltage? I'm assuming these are just bypass caps?
3. The 1.1Kohm resistor (R54) does not need to be installed on a P72, why? What is the function of this resistor on the other ECUs?
4. CN2 looks like it should be a simple Molex part. MTA100-4. Is this true?
5. Do you have a PN for the ROM socket? Or any 28-pin ROM Socket will fit? 0.1 spacing?
6. I read the ROMEditor 2.5 Manual and it says any EPROM similar in performance to the Shand Thomson ST M27C256B-15F1 should be fine. Does the ATMEL have to be 150ns? Can it be less? The one ATMEL EEPROM AT29(27?)C256 at 150ns looks like it might go obsolete. Is there a replacement or alternate vendor?

Thanks!

lazer · Post by **lazer** » Tue Oct 21, 2003 2:23 am

Here what I can tell. I've got a 2B and I've recently began to upgrade from a P28 to a P30 (JDM OBD 1 ECU).

1) The real determining factor will be if it's a USDM or JDM ecu. The USDM ecus use regular IC 74HC373N chips. The JDM ECU's use surface mount chips (smaller). Here is the info off the regular chip.
FP0112SD
MM74HC373N
MC74HC373N

2) Not sure.
3) Again not sure.
4) I'm checking that out (I need one for my P30 ECU).
5) Any will work....get a ZIF one if you're not gonna get an emulator (saves time).
6) Pretty sure you can go with a faster chip. Check the data sheet on it and just make sure it's backwards compatiable.

ninjanick · Post by **ninjanick** » Tue Oct 21, 2003 10:13 am

Actually I figured out that the chip is from TI. The EEPROMs can be 90ns as that's what I saw on my buddies P72. And the it is a Molex part .. MTA100-4.