[nukewater]

Has Anyone gone from 10*bdc - 16*bdc (i think thats it) how exactly does retarding/advancing your time give you more hp/tourqe/feul efficiency. and if it was such a fantastic thing, why arent all cars made with the timing all ready retarded/advanced.

If ne one knows a good technical reason on why this happens. that would rock.. im sure im not the only one who has wondered this.. im just the loudest ;-)

 

[93scortluv]

that the 1.8l mazda motor. let me think here, oh yeah, just remember to run a high octane rating when changing it or ping ping will happen. and the resson it gives your car more hp/torgue is because you just moved the factory timing setting from its stock position to its better posistion. it makes really no sence to me why it does this but us 1.9 guys cant because the computer controls it.. well not mine but all others it does.. Ive got a couple of tricks up my sleeve so thats why I was able to move mine... (ie: disconnecting sensors) Odb1 Rocks

 

[Zeemax]

Basically, by advancing timing, you ignite the fuel/air early, giving the explosive front more time to propagate - resulting in greater power forcing the piston down during the power stroke.

 

[siragan]

Reason why the factory setting isn´t advanced is because it promotes knocking if you´re not careful.

hey sportscort- what are some "tricks" you have up your sleeve? I´m planning on building an air/fuel mix volt meter thing... but what about ODB1? I have ODB1 and I kinda want to play the system

 

[Juggernaut]

aren´t the 91-93 lx´s obd1 as well? i just remember seeing this somewhere

 

[siragan]

yeah I´m pretty sure that they are... I think odb2 came out in 96... not sure though.

 

[93scortluv]

Okay I will give away one of my secrets. Disconnect the o2 sensor..

 

[siragan]

I couldn´t imagine that disconnecting the O2 sensor would be a good thing... when it´s in open loop mode it uses that sensor to find out how rich/lean the mix is. And if you´re running too lean, then the engine wouldnt know and you could destroy your engine...

actually, speaking of the o2 sensor... I want to probe it, but I don´t know where along the wire is a good place to probe...

any other "secrets"?

 

[94egtDAP]

A good place to probe it is near the connector, Which on the 2nd gen egt is right where the Upper rad. hose connects to the block, where the thermostat is located. If you want i can take pictures of it, I probed it there to add a air/fuel ratio gauge.

 

[ocorzo]

Disconnecting the O2 sensor would not do anything for performance, while the engine is in open loop, it needs the sensor input to properly adjust the air/fuel mixture. and while at closed loop (or wide open throttle) the ECU ignores the O2 signal and relies on internal maps for proper mixture (normally on the rich side) Advancing the timing will yield slight power increase and move the power band down a bit on the rpms. but at the cost of a slight power loss at top end.