Benefits Of Advancing Timing?
02-07-02, 10:02 PM
#27
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Originally posted by SoulPyr0
How far did you turn yours ?
like turns total... as in one full turn...
How far did you turn yours ?
like turns total... as in one full turn...
02-07-02, 10:49 PM
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Originally posted by ka8legend
Though members mentioned that the timing was self-adjusting after a certain rpm?
Though members mentioned that the timing was self-adjusting after a certain rpm?
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.
02-07-02, 11:10 PM
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Originally posted by BhamBill
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.
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.
02-07-02, 11:51 PM
#31
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Originally posted by ka8legend
So that means it's useless to manually adjust that timing by 5deg BTC since the ecu goes by its own curve anyway, no?
So that means it's useless to manually adjust that timing by 5deg BTC since the ecu goes by its own curve anyway, no?
02-08-02, 12:49 AM
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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.
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.
02-08-02, 09:15 AM
#33
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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...
Originally posted by NZConvertible
No, I mean exactly what I said. There is a point where maximum power will be achieved. Retarded from there you will lose power, advanced from there you will also lose power but you'll do damage because you're trying to push the piston down while it's still coming up.
No, I mean exactly what I said. There is a point where maximum power will be achieved. Retarded from there you will lose power, advanced from there you will also lose power but you'll do damage because you're trying to push the piston down while it's still coming up.
02-08-02, 11:24 AM
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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.
02-08-02, 11:38 AM
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Originally posted by Kahren
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...
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...
02-08-02, 11:42 AM
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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
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
02-08-02, 11:45 AM
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Originally posted by Kahren
TDC is top dead center in a piston engine
TDC is top dead center in a piston engine
02-08-02, 01:40 PM
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yea i was thinking that, i really meant advancing is EARLIER, sorry for my "typo"
Originally posted by SpeedRacer
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.
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.
02-08-02, 04:18 PM
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Originally posted by SpeedRacer
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.
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.
Cory
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