How far did you turn yours ?
like turns total... as in one full turn...

 

Now your scaring me! It gets turned a very small amount, with the aid of a timing light. I highly recommend you leave this alone or get an expert to do it!

 

yeah, i'm just trying to learn...
I am getting a profes. to do it... i'm not that crazy
lol

 

All engines have "self-adjusting" timing or they wouldn't be able to run at higher RPM. My 56 Chev had centrifugal weights in the distributor that caused it to advance as RPM increased. You could change the weights to change the timing curve.

In your RX-7 (and all other modern cars) that's a software program in the ECU. That's one of the things changed with the chip. Now it's called mapping. SoulPyr0, you really need to get yourself a manual and do some reading.

 

So that means it's useless to manually adjust that timing by 5deg BTC since the ecu goes by its own curve anyway, no?

 

Nah, the ECU simply detects the position of the engine via the crank angle sensor (hence the name!), which is set to a base (or static) timing point. The ECU's ignition map basically has "corrections" to this base timing depending on load, rpm, temp, knock, etc. If you adjust the CAS, you move the timing by that amount across the entire range, not a particularly good way to tune.

 

Oh yeah, ignition mapping.

Let me get this straight.

Buying something that modifies this "mapping" stuff is better than turning your crank angle sensor until it feels good? That sounds like NASA stuff you need a security clearence for.

When I want my car to go faster, I just jump out and run along side of it yelling.

Now that works.

 

when u advance u spark after TDC no damage just loss of power, that is if your octane number can sustain goign to complete tdc. u will gain more power if u can have the the octane number match the sparkor just passed that point...

 

TDC? Timing Dead Center ?
Octane will help if you chance your timing i know that for a fact...
But, Would a JET Chip help for the hp problems ?

 

TDC is top dead center in a piston engine

 

That really woudnt help me since i dont have a piston engine but, thanks for the knowledge...

 

If it will help any, the LEAD mark is at 5 degrees AFTER top dead center and the TRAIL is 20 degrees AFTER top dead center. So with a measuring stick you should be able figure out where TOP DEAD CENTER is within reason.

 

Advancing ignition timing means the spark comes before TDC. You and NZConvertible are thinking the same thing, you just have your terminology a little off I think.

 

Hey, for anybody who is reading this and having trouble understanding Port timing, and terms such as TDC, BDC, ATDC, BTDC, ABDC, BBDC, then check out this site. http://personal.riverusers.com/~yawpower/dectech.html
Its a long article, but READ it, and understand it. It will totally help you out with understanding port timing in a rotary engine. And while you are it, read the other tech articles on this page. Paul Yaw explains everything REALLY well. This site tought me SOO much about rotary engines. http://personal.riverusers.com/~yawpower/techindx.html

 

SoulPyr0 - TDC is basically the same thing in a rotary engine. Its when the intake cycle is complete, and the air/fuel mixture is completely compressed against one side of the rotor, and the rotor housing.

 

yea i was thinking that, i really meant advancing is EARLIER, sorry for my "typo"

 

I would think advancing ignition timig would mean the spark comes before where it used to be set...IF factory specs are for the leading plugs to fire f degrees ATDC and you set it to fire right at TDC, you've advanced it five degrees. I think

Cory

 

I better not screw w/ this, as I am completly LOST at this point. But good info guys!