Limits of 77-78 ECU
12-22-2003, 07:47 PM
#1
Guest
Posts: n/a
Limits of 77-78 ECU
I was just curious as to how much modding will the stock ECU handle on a 280z before it must be piggybacked/bypassed/replaced...or does it at all?
This has stopped most of my modding hopes for my AE86 (among others), as the computer will really only allow another 40 or so horsepower to be gained, so i was curious about Nissan's limits...
If i increased the compression with better pistons, radical cam, etc. etc. Would the injectors be able to keep up as well?
If it indeed has many limitations, i was thinking of leaning more towards the carbs (240z)...
This has stopped most of my modding hopes for my AE86 (among others), as the computer will really only allow another 40 or so horsepower to be gained, so i was curious about Nissan's limits...
If i increased the compression with better pistons, radical cam, etc. etc. Would the injectors be able to keep up as well?
If it indeed has many limitations, i was thinking of leaning more towards the carbs (240z)...
12-23-2003, 07:26 AM
#2
The Evil Twin
Join Date: Mar 2001
Location: Seattle, WA
Posts: 9,294
Carbs can be pretty good too. Properly tuned SU's or tripple sidedrafts.
The ECU is pretty simple and doesn't take much modding. Are you into electronics?
I've heard two different stories on the ECU. One was that it is dual bank firing half the injectors at once and going back and forth. this is like most fuel injection systems. Another source told me it is a single bank firing all six injectors at the same time.
Basically if you want more fuel in the engine, just leave the ECU alone and modify the sensors and swap to larger injectors. For an N/A application you don't need massive injectors but larger ones still help a lot for high rpms. Tweak the AFM or head temp sensor for richness adjustment. You can also buy a progressive rate fuel pressure regulator for N/ A fuel injected Z's.
With your mods you probaby have figured out the stock ECU and fuel system runs lean above 5000 rpm. Open up that intake manifold a bit too. That thing is made for good torque.
Or build yourself a MegaSquirt ECU. Fully programable and it is a two bank design. It has a MAP sensor, no AFM so your intake is more wide open!
The ECU is pretty simple and doesn't take much modding. Are you into electronics?
I've heard two different stories on the ECU. One was that it is dual bank firing half the injectors at once and going back and forth. this is like most fuel injection systems. Another source told me it is a single bank firing all six injectors at the same time.
Basically if you want more fuel in the engine, just leave the ECU alone and modify the sensors and swap to larger injectors. For an N/A application you don't need massive injectors but larger ones still help a lot for high rpms. Tweak the AFM or head temp sensor for richness adjustment. You can also buy a progressive rate fuel pressure regulator for N/ A fuel injected Z's.
With your mods you probaby have figured out the stock ECU and fuel system runs lean above 5000 rpm. Open up that intake manifold a bit too. That thing is made for good torque.
Or build yourself a MegaSquirt ECU. Fully programable and it is a two bank design. It has a MAP sensor, no AFM so your intake is more wide open!
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