Intentional Over-Rev Followed By DME scan
02-03-2008, 04:39 PM
#1
Rennlist Member
Thread Starter
Intentional Over-Rev Followed By DME scan
Well, this has to be one of the more peculiar posts from me but my curiosity had simply peaked.
I recently posted about my use of Durametric software to scan my DME and reset the service reminder. It's basically just another toy for me to play with and I think it's kind of cool.
Anyhow, Porsche reports overrevs as number of ignitions in each given range. My thinking on "ignitions" is that it refers to individual cylinder firings. I scanned my DME several operating hours ago and then intentionally ran the car to the rev-limiter last night in 3rd gear. I probably felt the fuel cutoff for 0.5-1 sec or so before shifting....mission accomplished.
I scanned the DME again this morning and found that 121 Range 1 ignitions had occurred in this single overrev session (i.e. total overrevs 219 minus starting count of 98).
If the engine is spinning at 7200 rpm, this is the same as 120 revolutions per second. This would suggest that I was revlimiting for approximately 1 second. What I am not sure of with the Boxer engine, is whether or not a single ignition provides a full revolution of the engine; hence my math may be off.
If anyone can chime in on the ignition vs RPM math, I'd appreciate it.
I hope you enjoyed this utterly ridiculous experiment on my part.
Scan excerpts:
BEFORE intentional overrev:
AFTER intentional overrev:
Range 1: 7300-7500 RPM
Range 2: 7500-7700 RPM
Range 3: 7700-7900 RPM
Range 4: 7900-8400 RPM
Range 5: 8400-9500 RPM
Range 6: 9500-11000 RPM
I recently posted about my use of Durametric software to scan my DME and reset the service reminder. It's basically just another toy for me to play with and I think it's kind of cool.
Anyhow, Porsche reports overrevs as number of ignitions in each given range. My thinking on "ignitions" is that it refers to individual cylinder firings. I scanned my DME several operating hours ago and then intentionally ran the car to the rev-limiter last night in 3rd gear. I probably felt the fuel cutoff for 0.5-1 sec or so before shifting....mission accomplished.
I scanned the DME again this morning and found that 121 Range 1 ignitions had occurred in this single overrev session (i.e. total overrevs 219 minus starting count of 98).
If the engine is spinning at 7200 rpm, this is the same as 120 revolutions per second. This would suggest that I was revlimiting for approximately 1 second. What I am not sure of with the Boxer engine, is whether or not a single ignition provides a full revolution of the engine; hence my math may be off.
If anyone can chime in on the ignition vs RPM math, I'd appreciate it.
I hope you enjoyed this utterly ridiculous experiment on my part.
Scan excerpts:
BEFORE intentional overrev:
AFTER intentional overrev:
Range 1: 7300-7500 RPM
Range 2: 7500-7700 RPM
Range 3: 7700-7900 RPM
Range 4: 7900-8400 RPM
Range 5: 8400-9500 RPM
Range 6: 9500-11000 RPM
02-03-2008, 05:07 PM
#2
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Join Date: Oct 2005
Location: Julian, CA
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...What I am not sure of with the Boxer engine, is whether or not a single ignition provides a full revolution of the engine; hence my math may be off.
If anyone can chime in on the ignition vs RPM math, I'd appreciate it.
I hope you enjoyed this utterly ridiculous experiment on my part....
If anyone can chime in on the ignition vs RPM math, I'd appreciate it.
I hope you enjoyed this utterly ridiculous experiment on my part.
...
02-03-2008, 05:14 PM
#3
Rennlist Member
Thread Starter
With three ignitions per revolution, that would suggest 120 overrev ignitions at approximately 7200 rpm would occur in 1/3 second....I guess that seems about right.
02-05-2008, 02:26 AM
#4
Well, this has to be one of the more peculiar posts from me but my curiosity had simply peaked.
I recently posted about my use of Durametric software to scan my DME and reset the service reminder. It's basically just another toy for me to play with and I think it's kind of cool.
Anyhow, Porsche reports overrevs as number of ignitions in each given range. My thinking on "ignitions" is that it refers to individual cylinder firings. I scanned my DME several operating hours ago and then intentionally ran the car to the rev-limiter last night in 3rd gear. I probably felt the fuel cutoff for 0.5-1 sec or so before shifting....mission accomplished.
I scanned the DME again this morning and found that 121 Range 1 ignitions had occurred in this single overrev session (i.e. total overrevs 219 minus starting count of 98).
If the engine is spinning at 7200 rpm, this is the same as 120 revolutions per second. This would suggest that I was revlimiting for approximately 1 second. What I am not sure of with the Boxer engine, is whether or not a single ignition provides a full revolution of the engine; hence my math may be off.
If anyone can chime in on the ignition vs RPM math, I'd appreciate it.
I hope you enjoyed this utterly ridiculous experiment on my part.
Scan excerpts:
BEFORE intentional overrev:
AFTER intentional overrev:
Range 1: 7300-7500 RPM
Range 2: 7500-7700 RPM
Range 3: 7700-7900 RPM
Range 4: 7900-8400 RPM
Range 5: 8400-9500 RPM
Range 6: 9500-11000 RPM
I recently posted about my use of Durametric software to scan my DME and reset the service reminder. It's basically just another toy for me to play with and I think it's kind of cool.
Anyhow, Porsche reports overrevs as number of ignitions in each given range. My thinking on "ignitions" is that it refers to individual cylinder firings. I scanned my DME several operating hours ago and then intentionally ran the car to the rev-limiter last night in 3rd gear. I probably felt the fuel cutoff for 0.5-1 sec or so before shifting....mission accomplished.
I scanned the DME again this morning and found that 121 Range 1 ignitions had occurred in this single overrev session (i.e. total overrevs 219 minus starting count of 98).
If the engine is spinning at 7200 rpm, this is the same as 120 revolutions per second. This would suggest that I was revlimiting for approximately 1 second. What I am not sure of with the Boxer engine, is whether or not a single ignition provides a full revolution of the engine; hence my math may be off.
If anyone can chime in on the ignition vs RPM math, I'd appreciate it.
I hope you enjoyed this utterly ridiculous experiment on my part.
Scan excerpts:
BEFORE intentional overrev:
AFTER intentional overrev:
Range 1: 7300-7500 RPM
Range 2: 7500-7700 RPM
Range 3: 7700-7900 RPM
Range 4: 7900-8400 RPM
Range 5: 8400-9500 RPM
Range 6: 9500-11000 RPM
02-06-2008, 08:45 PM
#5
Racer
Join Date: Oct 2005
Location: Julian, CA
Posts: 324
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After reading your post I figured it was time to order the Duramteric diagnostic software and USB interface. It arrived today and my DME readout at 14,415 miles and 328 hours shows:
range 1 10,067/326h
range 2 258/326h
range 3 26/249h
range 4 0/0h
range 5 0/0h
range 6 0/0h
I surmise that with the X51 package the rev limits are slightly higher per rev range as the engine is built to rev higher and produces peak power at a higher rpm. I am guilty of inadvertently hitting the rev limiter more times than I can recall; the power and sound at high rpm is intoxicating.
When I ordered the software/USB interface online I was asked where I heard about their product and I said “Coochas”!
range 1 10,067/326h
range 2 258/326h
range 3 26/249h
range 4 0/0h
range 5 0/0h
range 6 0/0h
I surmise that with the X51 package the rev limits are slightly higher per rev range as the engine is built to rev higher and produces peak power at a higher rpm. I am guilty of inadvertently hitting the rev limiter more times than I can recall; the power and sound at high rpm is intoxicating.
When I ordered the software/USB interface online I was asked where I heard about their product and I said “Coochas”!
02-06-2008, 09:19 PM
#7
Rennlist Member
Thread Starter
After reading your post I figured it was time to order the Duramteric diagnostic software and USB interface. It arrived today and my DME readout at 14,415 miles and 328 hours shows:
range 1 10,067/326h
range 2 258/326h
range 3 26/249h
range 4 0/0h
range 5 0/0h
range 6 0/0h
I surmise that with the X51 package the rev limits are slightly higher per rev range as the engine is built to rev higher and produces peak power at a higher rpm. I am guilty of inadvertently hitting the rev limiter more times than I can recall; the power and sound at high rpm is intoxicating.
When I ordered the software/USB interface online I was asked where I heard about their product and I said “Coochas”!
range 1 10,067/326h
range 2 258/326h
range 3 26/249h
range 4 0/0h
range 5 0/0h
range 6 0/0h
I surmise that with the X51 package the rev limits are slightly higher per rev range as the engine is built to rev higher and produces peak power at a higher rpm. I am guilty of inadvertently hitting the rev limiter more times than I can recall; the power and sound at high rpm is intoxicating.
When I ordered the software/USB interface online I was asked where I heard about their product and I said “Coochas”!
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02-07-2008, 06:59 AM
#9
Rennlist Member
Thread Starter
www.durametric.com/buyus.aspx
"Enthusiast package" (what I got) will allow you to use the tool on up to 3 p-cars.
"Enthusiast package" (what I got) will allow you to use the tool on up to 3 p-cars.
