so i had a successful exhintake instal along with a super duper custom air intake..pics on request.
my question now is: why does this engine seem to run best with the ignition timing completely maxed out?? no signs of detonation at all..i backed it out just a couplr deg. just because this is strange.

any thoughts?

197.5 on the cam..afm is after the filter and no leaks. just for the nerds, i measured the intake pressure in the area where air is being picked up from @ about 1/10th to 1/20th of a p.s.i., in the cowl/ wiper area.

definitely picked some mental horsepower...yeah

 

AFM? Did you do the exhaustitake on a 1.6? If so the maxed out timing makes sense, put a timing light on it, I bet its in the 10deg ball park.

 

i was under the impression that the exhintake was for the 1.8 only.. anyway, mine is a 95 1.8........air flow meter

 

your 95 has a maf not afm

 

Your timimg belt may be off a tooth...

 

Maf..everything is all lined up. It runs great and is getting 29.8 mpg.

 

I can see how a tooth would make a difference in timing though..

 

Maybe the head has been resurfaced more times or at a greater cut than I am aware of?? Maybe I need to try running the exhaust cam one tooth retarded? Or an adjustable gear perhaps?

 

What does the timing light say you are running for timing?

 

I also have a built 94 motor with exhintake cam that I swapped in this weekend.
Max timing on the cas will only read 12 degress with timing light. (Is something wrong here?)

I am getting some pinging at light throttle around 3000 rpm.

I am not sure if this is because of the slight vacuum hiss around intake manifold that needs to be looked at.
Or old fuel... (3 months old, but it was 94 octane)
Or possibly clogged fuel filter.
Or I need an MS with a tune? 84mm 8.6 supetech, stock ECU will be able to run this, no?

 

I thought this exhintake swap was for non turbo.. too much duration for turbo app. Anyone back me up on this ?

 

PS., fix your vacume leak and then jack my thread....

 

update:

checked the timing.. off the chart and looks something like 20,21,22,23 deg. absolutely no detonation whatsoever.

 

bump for some input..

 

you probably drilled the cam gear in the wrong place

 

Not by much, if at all. Checked it against the template.defiantly not enough to warrant 23 deg. Of timing.

 

how are you measuring your timing? under what conditions?

If you're on stock ECU, looking with a timing light at idle, without timing jumper - that sounds almost normal. Nothing wrong with idling at 20*

 

Jumper installed during timing check.. ten to gnd. Warm engine.Stock ecu. Maybe, if it ain't broke, don't fix it?

 

Pretty sure on 95 there are 2 timing marks on the crank pulley (why, mazda?). The 2 marks are 10* off. Could it be you're reading the old one?

 

also the rubber damper could have moved on its axis (meaning it should be replaced).

how to accurately locate TDC:
How To Degree Cams