Timing Advance

m4vr1k · Post by **m4vr1k** » Fri Aug 19, 2011 7:42 pm

Hey all, going to advance the timing on the Mazdarati tomorrow, just wondering if it is worth advancing it to more than 14 degrees?
Cheers
Zac

WideOpenThrottle · Post by **WideOpenThrottle** » Fri Aug 19, 2011 8:10 pm

According to my MX5 performance book 14 degrees is best for top end power with torque gains in low & mid rpm range as well.

18 degrees is really better for low rpm and requires the use of a higher octane fuel & i would think at high rpm you may suffer detonation issues.

Angreal · Post by **Angreal** » Fri Aug 19, 2011 10:56 pm

How does one advance the timing, is it possible to do for the NA8C and is there any benefit to doing it to the 1.8L?

m4vr1k · Post by **m4vr1k** » Sat Aug 20, 2011 9:48 am

Have run into an issue. The CAS is turned as far as it will go, but the timing marks are on the far right of the scale, close to the T. Any suggestions?
Angreal, from what I have read, the Na8 uses a different setup which is a real pain to advance. most seem to recommend leaving it alone.

WideOpenThrottle · Post by **WideOpenThrottle** » Sat Aug 20, 2011 10:11 am

Sounds to me you are at TDC as this point is 5 marks to the right of the 10 degree advanced point. NOTE- each mark represents 2 degrees so to be advanced 14 degrees the mark needs to be two marks to the left of 10 degrees.[thats if i have read my book correctly]

Also are you shorting gnd & 10 of the diagnostic box,at op temp & approx 850rpm?

The 1.8 litre requires a 12mm socket to get to the CAS bolt-its just harder to get to than a 1.6!

Brainflex · Post by **Brainflex** » Sat Aug 20, 2011 10:44 am

I did my 1.8, feels livelier at high revs, didnt notice much difference at low, small difference at mid. 14 degrees n no problems on 91 octane.

m4vr1k · Post by **m4vr1k** » Sat Aug 20, 2011 10:47 am

Yep, I have the gnd and ten bridged. Heading to a workshop after work that has a better timing light to try again. When advancing the timing, should the revs drop?

WideOpenThrottle · Post by **WideOpenThrottle** » Sat Aug 20, 2011 12:45 pm

The revs may drop so adjust back to 850 after each adjustment.
Be also aware that there may be two timing marks on the pulley & the one to look out for should be painted yellow.
Use an inductive timing light.
When you remove the jumper wire the revs should increase slightly[25rpm approx] but no need to adjust again unless maybe you were at 900rpm prior.
A higher rpm makes it a bit nippier from take-off but wastes fuel at idle!

m4vr1k · Post by **m4vr1k** » Sun Aug 21, 2011 3:03 pm

Got it all sorted with a decent timing light. What a difference! Very noticable, has livened up the car plenty.

thebears · Post by **thebears** » Fri Dec 09, 2011 9:02 am

Angreal wrote:How does one advance the timing, is it possible to do for the NA8C and is there any benefit to doing it to the 1.8L?

I'd like to know too. Anyone local can do it for me? What's the benefit?

m4vr1k · Post by **m4vr1k** » Fri Dec 09, 2011 9:20 am

I think you can, but the amount of work makes it not worthwhile, it something. Ask Google, that guy knows everything.

Euen · Post by **Euen** » Fri Dec 09, 2011 12:51 pm

It can be done for a NA8 and I am led to believe there are benefits. I haven't needed to do it as I am using an aftermarket ecu and that looks after it all.

It is not difficult to do and the instructions are here
http://www.flyinmiata.com/techline/olde ... es.asp#top

You need to read the instructions for 1.6 and 1.8 as they are interrelated.

Timing Advance

Timing Advance

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