4Age Timing Issue

[bennyq]

Ok so I'm having a fair amount of trouble with the timing of my 4age.

It's a bigport (out of a jap 86 apparantly) gone into my adm 86.

So, I've spent hours going through old articles on the forums about timing, but I'm still not getting it right.

 

I turn the engine to TDC (0 degrees on the timing marks above the crank pulley)

The crank mark lines up, the cam gear marks line up, and the mark on the cam shaft under the oil cap hole is there too.

I line the dizzy marks up and put it in. I bridge T and E1 on the ecu as I can't find the diagnostics plug in my loom.

I then get the timing to 10 degrees at idle (800rpm ish, when warm)

Sounds like I'm doing everything right? but for some reason when I rev the car it sounds very sluggish. As if there is a hesitation between when I turn the throttle and when the engine itself actually revs.

 

I can't really drive it atm as it's not rego'd, so I don't know how it actually goes. When I have the timing set to about 23 degrees-ish without T and E1 bridged the car seems to be a bit more responsive. To be honest I have no idea what's going on haha

Hoping someone has any ideas of what problem this could be?

Should I just have it set to 23 degrees? It's a stock engine, could this be bad for it?

Any help or opinions is greatly appreciated

Sorry about the essay, thanks for reading

[MYSTIK[RL]]

heres a link to how to do it once everything is lined up.

 

4age timing

 

also are you revving the car while the terminals are bridged?

[altezzaclub]

Is it the factory dizzy for that motor??

 

Have you checked the weights in the bottom of the dizzy? Maybe they are gummed up and not advancing it.

 

You could mark the crank pulley with white ink out to 40deg and then make a timing graph of advance V revs every 500rpm up to 3500. That will give you the advance curve you have and there should be a factory one on the net somewhere.

 

The electronic dizzy I bought for the 4K was as flat as a pancake, it had an advance curve for a van or a forkhoist... Here's how I sorted it-

 

http://www.rollaclub.com/board/topic/42407-the-girls-ke70/page__st__45

 

 

 

 

 

[parrot]

The dizzy body has a second 'mark' that can cause confusion sometimes when lining things up.

 

Don't under estimate the importance of having your throttle position sensor set up correctly.

 

Then it is more mundane stuff such as ensuring the fuelling is optimal - injectors not gummed up, clean filter, correct fuel pressure regulator. correct fuel line setup.

[bennyq]

Cheers for the help guys. I was actually starting to think it could have something to do with the TPS.

And yeah I let it idle while I try and get the timing right. Then I get it at 10 degrees BTDC and give it a rev and thats when it sounds sluggish and generally not right. I'm sure I'm doing the timing right, as everything seems to line up perfectly. I have been reading however that people have their timing advanced a bit and that seems to go ok for them...

[parrot]

Not really, it depends also on the cam timing. Remember, the ECU controls the "advance curve' so to speak, dependent on the sensor signals coming in to it.

 

You can't really fool that.

 

Cam timing is really the one variable you can affect independent of the factory ECU, unless you start playing with map sensor signals.

 

But yes, make sure your TPS is set correctly first, and see how you go.

 

See 4AGE diagnostic manual

[bennyq]

ok cool thanks for your help man, appreciate it. I'll have a crack at the TPS to make sure its right, and see what happens I guess.