Bad final HPDE of the season
11-05-2016, 10:12 AM
#31
Rennlist Member
Thread Starter
11-05-2016, 10:28 AM
#32
Rennlist Member
You probably have a corresponding spike in type 1s as well.
11-05-2016, 10:35 AM
#33
Rennlist Member
What is the source of this ^ info?
I was told ignitions are one per cylinder for each revolution.
In math terms: if over revs are 214, then divide 214 by 6 = 35.66 engine revolutions over red line.
Based on info above, with 214 ignitions divided by 3 = 71.33 engine revolutions over red line.
I'm curious because I was told by a Porsche tech (who might have been wrong, or maybe I didn't understand).
I was told ignitions are one per cylinder for each revolution.
In math terms: if over revs are 214, then divide 214 by 6 = 35.66 engine revolutions over red line.
Based on info above, with 214 ignitions divided by 3 = 71.33 engine revolutions over red line.
I'm curious because I was told by a Porsche tech (who might have been wrong, or maybe I didn't understand).
11-05-2016, 10:46 AM
#34
Rennlist Member
I got that info from here because it's the clearest description:
http://www.911virgin.com/porsche/rev-range-information/
But I have long understand to mean ignitions as 3 per rev because 2 cylinders fire simultaneously each ignition. Similar info here:.
http://www.911virgin.com/porsche/rev-range-information/
But I have long understand to mean ignitions as 3 per rev because 2 cylinders fire simultaneously each ignition. Similar info here:.
I posted this on the gt3 forum but I altered it a bit to be applicable here too.
To calculate ignitions to seconds just change the rpm's of the example given to the 997tt ones.
DME stores number of ignitions over 6 ranges of rpm for the 997s and 2 ranges for the 996s and the operating hours of the overrev occurrence.
Ignitions are the firings of the spark plugs
On the 911 because its a six cylinder 4 stroke engine you get 3 ignitions per 1 revolution.
For example in a 997GT3.1 you divide the max rpm limit of 8400rpm with 60 seconds and you get 140 revolutions per second of the engine at redline.
Multiply this by 3 and you have the ignitions per second of the engine at redline 140x3= 420 ignitions per second on the rev limiter.
From this you can see how long *in seconds the engine stayed in a particular rpm range and also from the operating hours you can see how long ago this happened.
On the 996 GT3 with rev limiter at 8200rpm 2 types of over revs were recorded in the DME type 1 that recorded every ignition above 8201 rpm. And type 2 which recorded every ignition above 8801 and to infinity.
From the 997 introduction newer DME has the ability of recording not only type 1 and type 2 but 6 types so that the dealers can check easily not only when a type 2 overrev happened and how long it lasted but also at what range of revs.
Type 1 are stored SAME like in 996 for all 997s meaning that type 1 is very common and every one who hits the rev limiter while accelerating should have them.
Type 2 to 5 is adding 200 -300 rpm more for each range and type 6 are overrevs fe. over 9500 and to 11000 and if recorded in dme will probably void your warranty.
Hope this helps
John
To calculate ignitions to seconds just change the rpm's of the example given to the 997tt ones.
DME stores number of ignitions over 6 ranges of rpm for the 997s and 2 ranges for the 996s and the operating hours of the overrev occurrence.
Ignitions are the firings of the spark plugs
On the 911 because its a six cylinder 4 stroke engine you get 3 ignitions per 1 revolution.
For example in a 997GT3.1 you divide the max rpm limit of 8400rpm with 60 seconds and you get 140 revolutions per second of the engine at redline.
Multiply this by 3 and you have the ignitions per second of the engine at redline 140x3= 420 ignitions per second on the rev limiter.
From this you can see how long *in seconds the engine stayed in a particular rpm range and also from the operating hours you can see how long ago this happened.
On the 996 GT3 with rev limiter at 8200rpm 2 types of over revs were recorded in the DME type 1 that recorded every ignition above 8201 rpm. And type 2 which recorded every ignition above 8801 and to infinity.
From the 997 introduction newer DME has the ability of recording not only type 1 and type 2 but 6 types so that the dealers can check easily not only when a type 2 overrev happened and how long it lasted but also at what range of revs.
Type 1 are stored SAME like in 996 for all 997s meaning that type 1 is very common and every one who hits the rev limiter while accelerating should have them.
Type 2 to 5 is adding 200 -300 rpm more for each range and type 6 are overrevs fe. over 9500 and to 11000 and if recorded in dme will probably void your warranty.
Hope this helps
John
11-05-2016, 10:56 AM
#35
Rennlist Member
I got that info from here because it's the clearest description:
http://www.911virgin.com/porsche/rev-range-information/
But I have long understand to mean ignitions as 3 per rev because 2 cylinders fire simultaneously each ignition. Similar info here:.
http://www.911virgin.com/porsche/rev-range-information/
But I have long understand to mean ignitions as 3 per rev because 2 cylinders fire simultaneously each ignition. Similar info here:.
11-05-2016, 02:18 PM
#37
Just think of all the fun you'll be having this winter. During these kind of projects I've found that cussin' at the wrench, screwdriver or my bloody knuckles makes the job go so much faster. Good luck.
11-05-2016, 02:26 PM
#38
Rennlist Member
11-05-2016, 03:57 PM
#39
Race Car
I put 125 range 2 on my engine last weekend. It's now up to 815. I'm hoping it goes another couple of years but if it doesn't make it past next weekend I won't be totally shocked.
11-05-2016, 06:25 PM
#40
Rennlist Member
Thread Starter
11-05-2016, 06:28 PM
#41
Rennlist Member
Thread Starter
! 2 beers is where I am most productive while wrenching. After 3, the productivity goes south.
11-07-2016, 07:00 PM
#42
Drifting
Sorry to hear about your money shift Kris...best of luck in getting the car back on track. I occasionally do track events with the Riesentoter region but I haven't seen your GR 996 at the track(although, I haven't done any PCA events in about two years).
Did you have your car at a PCA meeting at Knopf this past spring? I was in my GR 996 and a car similar to yours was parked near me.
Did you have your car at a PCA meeting at Knopf this past spring? I was in my GR 996 and a car similar to yours was parked near me.
11-07-2016, 07:52 PM
#43
Rennlist Member
Thread Starter
Sorry to hear about your money shift Kris...best of luck in getting the car back on track. I occasionally do track events with the Riesentoter region but I haven't seen your GR 996 at the track(although, I haven't done any PCA events in about two years).
Did you have your car at a PCA meeting at Knopf this past spring? I was in my GR 996 and a car similar to yours was parked near me.
Did you have your car at a PCA meeting at Knopf this past spring? I was in my GR 996 and a car similar to yours was parked near me.
Hope to see you out there again in the spring though.