I haven't had much time on the dyno to verify the relationship between timing in ECUFlash V.S. timing shown on the crank. Is there a direct correlation between the two meaning 19* in the ecu is 19* at the crank like what would be seen with a standalone. I personally haven't been able to check what the ecu reads during a high load pull on the dyno. Are there any variables taken into account like initial timing thats added to the values shown in ecuflash ex: 5* BTDC @ the crank + 17* in ecuflash = 22* total @ the crank ???

 

since the evo doesn't have a distributor i don't think you're going to have much luck with a timing light.

The timing numbers in ecuflash are total timing

 

Timing at the crank always stays the same and is called base timing.
The timing in ECUFLash is ignition timing. This is the timing you adjust for more power and that the ECU retards and advances.

 

I read on AEM forum no timing light needed
http://forum.aempower.com/forum/index.php?topic=10600.0

 

Evo's has a few spark plug wires. I think you can use those for the pulse / clamp-on. Right?

 

Wouldn't you only see the pulses from that single cylinder, then? It's been a while since I used a timing light but don't you need to connect it to the coil wire that connects to the distributor?

 

There's several different types of timing..

Base timing, its where the pickup gets its trigger signal from the sensor
Cam timing, of course..
and Ignition timing in the ECU

The only thing you can do with the timing light is set the base timing, and look at the cam timing.. Forgive me, I'm doing this from memory because its really not all that necessary if the timing belts are all lined up correctly, and the crank sensor is working properly.

But the base timing is static, it won't generally change unless there's a problem with the crank sensor. I honestly don't even recall if its even adjustable on the Evo..

Ignition timing is synced off the Cam and crank sensor though..

 

You can use a timing light with the Evo, most timing lights do have a divisor function that can correctly work with multiple coil ignitions, typically its set for 2 (2 coils) unless your using a tach trigger or distributor with single coil then its set for 1..

 

Malibu, that is understandable since the evo uses a waste spark type ignition. If you shoot the crank with an adjustable timing light, isn't it possible to divide the number by 2 to get total timing or the value shown in the ecu. So what your saying is timing in the ecu is directly correlated to actual spark timing in degrees within the cylinder. I have noticed through working at a engine/chassis dyno shop with not many DSM coming in is that peak timing is generally lower than most other 4 cyl imports. I know the head/pent roof chamber design is extremely efficient allowing us to run less timing, but 20-22* up top w/good octane seems odd considering boosted honda's can run anywhere from 22-27* of timing with the same boost levels. To put everything into perspective about timing, for the EVO, it is was it is when it comes to timing values in the ecu, correct me if im wrong.

 

The design of the head and location of the spark plug mean you don't really need to give it that much time to create enough combustion pressure therefore if you give too much timing, you just work against the piston trying to reach TDC..

as far as I know, the timing is what it is.. But I've never really given it much thought to be completely honest.

 

Interesting............. I really would like to check it out as soon as im able to get on a dyno.