Timing Light Reading - Double????

[Black33]

Hey all,

I tried to check my base timing by using a timing light I have and found that it was showing 6 white marks past the orange one.

Does this really mean that my car's timing is advanced 30 degrees??? cos I've heard that timing is hard to check with a normal timing light on an r33 and that the readings that you get are double what it actually is???

That would mean my timing is 15 degrees which is correct.

Can someone please help and shed some light on this!!!!

thanks

[Zahos]

where did you get the reading from?

You have a series 2 and I'm not sure how you would do it....

On my series 1, I used that wire coming from the ignitor module, but the reading was all over the place coz i have an el cheao timing light...

I then just used the wire(s) going to coil #1 and the reading looked good. I used my mates more reputable timing light (guessing coz he paid much more for it), to compare readings and they were the same.

When adjusting your timing via CAS, you can see it doesn't take much movement to go from 15deg to 30deg.

Or alternatively, you can get an old lead and modify it to go from spark plug #1 to the lead (more effort coz u gotta remove coil #1, and then get your reading from that lead.

Zahos

[Busky2k]

I think you have to disconnect the TPS in order to get a true base timing value, not the timing value the ECU uses for idle.

[Zahos]

I think you have to disconnect the TPS in order to get a true base timing value, not the timing value the ECU uses for idle.

Why is that?