Ignition Timing 1jz vs 2jz

[Wildsupra]

just wondering if the ignition timing on stock ecu's are the same or a fair bit different between 1jz-gte and 2jz-gte

for example would a 2jz-gte run using a 1jz-gte loom and ecu?? As far as timing alone goes forget all the other stuff like fuel etc etc

Cheers
Matty

[JZA70 R]

i couldnt tell you the answer in regards to the stock ecu, however i could tell you what the default (stock) timing maps are from apexi's powerfc units. That may give you an idea as to how different the stock ecu's may be.

[mic*]

I dunno either... I would reckon the ignition maps would be very alike given that base timing is the same and they would have fairly simillar knock characteristics under load which is generally the limitation of cetrifugal advance..

[Wildsupra]

yeah i thought they may be similar, however being different displacements and different compression ratios im thinkin they will be a slight difference through the maps, just wondering how much and if its too much to get away with interchanging ecu's etc.

TODD knowing the apexi basemaps would be a good starting point, if apexi think they can run the same on base then the factory ecu's cant be too dis similar.
If you have that info that would be great.

Cheers
Matty

[CrUZida]

I have heard of a few people on SoarerCentral running 2jzgte's on the original 1jzgte loom/ecu. The increase in capacity was counteracted by the increase in injector size, and then a SAFC of sorts was used to tweak.

Not sure how reliable or how long they ran like this for though.

[Wildsupra]

cheers peewee, that basically sums it up for me

[Fiver]

Hi guys, is there a simple way to check and adjust the base timing on a 1j? I've only ever set timing on older engines with an indictive light that attaches to the plug lead on cyl 1, but given these engines dont have plug leads what do i do? Or are they not adjustable for base timing?

[wilbo666]

Hi guys, is there a simple way to check and adjust the base timing on a 1j? I've only ever set timing on older engines with an indictive light that attaches to the plug lead on cyl 1, but given these engines dont have plug leads what do i do? Or are they not adjustable for base timing?

They aren't adjustable

The engine ECU uses the Crankshaft Position Sensor and Cam Position Sensors to know exactly what the position of the engine is!

From that it triggers the igniter and hence the ignition accordingly and accurately.

Cheers
Wilbo

[Fiver]

Cheers mate, I suspected that may be the case. I guess that means that the timing must be set to the correct base