280z Turbo timing.

[Grip_Z]

I recently converted my stock low miles 77 280z engine to turbo using the ZXT harness and ECU. My question is I know stock turbo timing is 20* BTDC and stock NA timing is 10* BTDC, but since my motor is higher compression ratio then the stock turbo motor would that affect what I should set my base timing at. Also I have searched around but can't seem to find what the full timing curve is under boost. Any help would be appreciated, My car runs ok but seems to have a small misfire I believe is do to off timing and improper set TPS.

[Grip_Z]

A little off topic but has to do with the same swap. Since my motor is the stock 77 280z motor it does not have a spot for the CHTS like on the ZX, only the Coolant Temp Sensor. AS of right now I have the CHTS wiring plugged into my CTS, Is this going to affect anything?

[randy 77zt]

Run the timing at 20.the timing curve is programmed into the ecm.You can test the difference between a temp sender and a chts with an ohmeter and a pot of hot water.some of the l series engines had lower thermostat housings the coud be drilled and tapped for 2 sensors.my car has the stock temp sensor for the gauges and a gm sensor for my aftermarket efi system.All of the threads are standard pipe thread-you can by taps at a hardware store.If you are running the oem 77 injectors you are running lean.If you are going to run this setup for awhile I would get some new injectors.Used injectors wont flow evenly across a set of 6 and a lean cylinder will preignite.I ran complete 81zxt engine/computor in my 77 for a long time.It ran very well.But when I installed it I replaced the injectors and other iffy parts while doing the install.After the install had the bugs ran out of it it was fun to drive-not alot of peak horsepower but it made boost very fast and had good torque.

Edited February 8, 2012 by randy 77zt

[Grip_Z]

Thanks for the reply. As for the injectors I am running stock turbo injectors, I swapped everything from my turbo donor car to my 77Z aside from the block and head. So everything on it is turbo. As it sits now I think it is running ok with using the coolant temp Sensor, it pulls hard in boost but kinda bogs out of boost. I know my O2 Sensor is bad and I may need to adjust my TPS which could be causing the bog.

[Tony D]

The resistance/temperature response curves are identical for IAT, CTS, CHTS in all the L-Series Engine applications (and across Nissan for that matter...)

[Grip_Z]

Then I wonder why my CTS is $10 and the CHTS is $40. Another easy way to make money I guess.