05 c6 vs post 05 ECU
11-11-2008, 05:02 PM
#1
Drifting
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05 c6 vs post 05 ECU
What's the difference between the 05 computer and the other C6's. I know the 05 is inferior in some ways, it seems to be extremely faulty after changing my differential to an 06 diff with 3.90's. My HUD and speedo swing down to 0 sometimes.
11-11-2008, 05:08 PM
#2
Team Owner
You have to adjust the computer to read correctly when you do a rear end.I think DIABLO can do that.My 05 was always fine when I had it,tuned or otherwise.Your RPM's will be slightly higher w/that rear end.
11-11-2008, 05:11 PM
#3
Drifting
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Did you change your case from the 05? Supposedly the 05 rear end is weak so I upgraded to an 06+ I believe. Now my tuner can't get it to stop swinging down to 0 mph every so often, my computer cannot handle the load is what i'm told... and the 06 and beyond cases calculate speed differently. Just looking to be educated.
11-11-2008, 06:07 PM
#4
Team Owner
No,I kept my original rear end.I know people did swap out theirs but I never heard of this issue.Yes,the rears in 05's are weaker,but It's not like I was throwing 1000 HP at it.Plenty of VENDORS/TUNERS on here have done the swap,CHUCK COW,ECS,etc.Look for those guys and ask.I've never heard of this problem.
11-12-2008, 07:32 PM
#6
Melting Slicks
More than likely its a gear/speed sensor issue.
The C6s use the actual teeth of the gear now to measure speed instead of a reluctor trigger built into the base of the ring gear. Usually this is an air gap issue, there is a big variation in that gap and aftermarket gears. Most of the time its a non issue, but once is a while it rears its ugly head. Also metal filings etc can get on the end of the sensor and interfere with the signal. I would pull the sensor and swap it first. Problem will probably go away.
Phil
PS I acutally prefer the E40 (05) PCM format over the E38 (06+)
The C6s use the actual teeth of the gear now to measure speed instead of a reluctor trigger built into the base of the ring gear. Usually this is an air gap issue, there is a big variation in that gap and aftermarket gears. Most of the time its a non issue, but once is a while it rears its ugly head. Also metal filings etc can get on the end of the sensor and interfere with the signal. I would pull the sensor and swap it first. Problem will probably go away.
Phil
PS I acutally prefer the E40 (05) PCM format over the E38 (06+)
11-13-2008, 09:10 AM
#8
Melting Slicks
The issuse is probably the gap between the sensor and the ring gear. There is a big variation from sensor to sensor in how large of a gap it can work with. It basically will loose signal under certain conditions of the teeth in the gear and will drop the speedo et all to zero. I usually find they work fine most of the time, but will freak out under certain conditions. As for the 05 vs 06+ diffs they function the same way.
11-13-2008, 05:50 PM
#10
Drifting
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More than likely its a gear/speed sensor issue.
The C6s use the actual teeth of the gear now to measure speed instead of a reluctor trigger built into the base of the ring gear. Usually this is an air gap issue, there is a big variation in that gap and aftermarket gears. Most of the time its a non issue, but once is a while it rears its ugly head. Also metal filings etc can get on the end of the sensor and interfere with the signal. I would pull the sensor and swap it first. Problem will probably go away.
Phil
PS I acutally prefer the E40 (05) PCM format over the E38 (06+)
The C6s use the actual teeth of the gear now to measure speed instead of a reluctor trigger built into the base of the ring gear. Usually this is an air gap issue, there is a big variation in that gap and aftermarket gears. Most of the time its a non issue, but once is a while it rears its ugly head. Also metal filings etc can get on the end of the sensor and interfere with the signal. I would pull the sensor and swap it first. Problem will probably go away.
Phil
PS I acutally prefer the E40 (05) PCM format over the E38 (06+)
11-13-2008, 07:28 PM
#11
Melting Slicks
11-13-2008, 09:21 PM
#13
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St. Jude Donor '07-'08-'09-'10-'12-'13-'14
It has nothing to do with the computer.
It has nothing to do with the computer. The E40 (05 pcm) is fine...Acts like a LS1 pcm...but faster.
It is a CAN bus controller with one channel (later ones have 2 channels)...
While it is a somewhat troublesome PCM from a flashing standpoint, It has nothing to do with the speedo....
In all likely hood (cause we fix them for people all the time
), many guys are quick to unbolt the diff and drop it down in anticipation of the new better gears....The issue is, in their excitement, they forget the plug for the speedo (that you can't see to easily) on top of the diff and usually forget to disconnect it.....
When the diff comes down (too fast) without unplugging it, the wires inside the jacket break contact. You can't tell they are broken inside....but...one of them is.....
That is the ONLY reason I've ever seen the speedo drop to zero while the car is moving.
Call me if you have questions.
Chuck CoW