Post by
vsaini »
https://forums.nicoclub.com/vsaini-u52526.html
Thu Aug 21, 2008 2:50 am
Fellas there is alot more to getting the Z32 ECU to work properly than to just run the car. We had the ecu running the car for over 2 years, before we stopped being lazy and worked on the car again.
After you complete the necessary Re-pinning of the RB Harness/ECM Connector. you need to do a few more little mods to make sure things are on the up and up.
In Conjunction with Ash-Spec Z Performance, we are basically going to have a "drop in" type of solution. We are waiting to goto the Dyno with our setup till we make any sort of package or announcement. But TS Fay has rained the piss out of us...
Off the top of my head:
02 Senors. Z32 has 2, RB has 1. You can split the signal coming from the Sensor into both inputs on the Z32 ECU. (remember to make sure you also ground it etc)
Fuel Temp Sensor Bypass. The Z32 has a Fuel temp sensor circuit. All you need to do is wire in a resistor (wired to a chassis ground) inline to bypass it.
Fuel Pump. Wire the fuel pump straight to a Power Source (preferably a battery) as the Z32 uses a secondary fuel pump controller to run mixed voltages to the pump. If you don't have the controller wired in. the fuel pump in many circumstances will not receive enough power to run at the right pressure/flow.
Try and get an earlier model 8-Bit ECU. Those are from the 300ZX TT from 90-94. And Non Turbo Z32 ECU's from 1990-1993. The other later model ones are 16-Bit, and will work, but at that point you have to install a daughter board and dual proms instead of the super easy Single prom in the 8 bit ecus. Which the RBB20's normally come with.
The reasons for the following additional corrections are simple. The VG has 2 o2 sensor inputs because the ECU runs it like two 3 cyl engines, during partial throttle conditions. You want to bridge the 02 sensor inputs mainly for partial throttle hawtness, and so your gas mileage doesn't suck balls. Also of course you run the greater risk of burning up one "bank" of clys quicker as it wont get the same amount of fuel as the others. etc.
The fuel temp sensor circuit is another of the "cold start" functionality. When the fuel temp is low the ecu thinks it needs to be in the warm up mode, so it dumps in a bunch of fuel to heat up the engine. Basically causing a rich condition at all points in the map till it gets warm. By bypassing the sensor the ECU thinks its already warmed up. So remember folks take it easy till the car warms up normally. But hey you should already be doing that shouldn't you?
If you have followed the other guides posted in this thread, coupled with these little guys, you should come back with Code 55 when you run the self-diagnostics. (code 55 = all clear) if you get anything else then you've got probs. That doesn't mean the car wont run, or you wont get a check engine light. alot of the Z32 codes will not produce a check engine light (assuming of course you wired the harness to also send signals to the dash plugs and diagnostic port) That is why running the ECU checks are critical.
Word Glad to see more peeps running the Z32 ECU. At the time our motorset didn't come with the ECU, only everything else. When we started examining it as compared to other nissan ECU's it just made sense to use the Z32. That and well we have so much experience decoding the z32 with our own cars. Oh and it helps that the leader of the Z32 ECM tuning and research is my best friend and lives a short distance from me in Florida. haha
Stay Tuned!
