1986/1987 Z31 ECUs and Battery Voltage

[1SIKZ31]

my car sounds like 1SIKZ31 car, from start to finish.
when I installed my nistune unit and resized my injectors, My car ran bad, almost to the point it would rev like 1,200 rpm max, thick black smoke out of the exhust pipe, I have it running fair now, not the best under boost, some times it goes pop like a gaint pop under boost.
maby this low battery voltage is causing part of the problem. its like 4.3 volts.

yup.
you are describing TO THE LAST LETTER the EXACT problem I was having...
As soon as I fixed this issue, and set the K value (450cc DSM blue top injectors) correct, the car was seemingless!

[Hendrick301]

Matt.... on my first start in the morning... car runs like CRAP, seems EXTREMELY rich so we we went to the tables and moved everything down to 0, so that there is NO enrichment at coldstart, it did get a TON better but the car is pulling timing.


How do you make it so that at COLD START it doesnt pull timing?

there should be a adjustment...

i think its "timing ADV"

my Z did the same cold start crap in the morning. would blow black stuff out the exhaust ran fine after she warmed up. but after fouling up 2 sets of spark plugs i also moved everything down to 0 (except first start enrich, it seemed to take longer to crank before it fired up) it did fix my fouling plugs...


as for why to zero everything...

i know the z had many cold start devices, such as a air regulator and egr ect. i know all that crap is removed on my motor, so leaning it out it will help

[Matt]

I'll send another board out tomorrow with the updated firmware and see how we go from there