Friend looking at a gt4
08-20-2018, 04:47 PM
#1
Pro
Thread Starter
Friend looking at a gt4
So I have buddy looking at a gt4 it’s set up for the track and has roughly $50k in upgrades ie suspension , 2 sets of track wheels, cage harness and RS carbon fiber front quarter panels
It’s priced right $95 k w 13,000 miles
The rub is the dme report would you consider buying it or pass ?
08-20-2018, 04:50 PM
#3
Pro
Thread Starter
Do I understand this correctly , When you read the the over rev report range 4 over means 358 revolutions happened in the 311th hour which is really one quick shift ?
08-20-2018, 05:13 PM
#4
Rennlist Member
Omg... No good gt4... Stay away from it
Every over Rev readings over level 2 is not a good thing... Level 4 and 5 are a really bad thing...
Every over Rev readings over level 2 is not a good thing... Level 4 and 5 are a really bad thing...
08-20-2018, 05:19 PM
#5
Burning Brakes
I’m not an expert here but can someone explain to me how you can have more range 4 over revs than range 3.
Report shows 358 over revs in range 4 and only 69 in range 3.
My logic is that you would hit range 3 prior to hitting range 4 so range 3 number should be higher or possibly equal to range 4.
Or or is my logic completely screwed up and I reading the report wrong.
Report shows 358 over revs in range 4 and only 69 in range 3.
My logic is that you would hit range 3 prior to hitting range 4 so range 3 number should be higher or possibly equal to range 4.
Or or is my logic completely screwed up and I reading the report wrong.
08-20-2018, 05:22 PM
#6
I’m not an expert here but can someone explain to me how you can have more range 4 over revs than range 3.
Report shows 358 over revs in range 4 and only 69 in range 3.
My logic is that you would hit range 3 prior to hitting range 4 so range 3 number should be higher or possibly equal to range 4.
Or or is my logic completely screwed up and I reading the report wrong.
Report shows 358 over revs in range 4 and only 69 in range 3.
My logic is that you would hit range 3 prior to hitting range 4 so range 3 number should be higher or possibly equal to range 4.
Or or is my logic completely screwed up and I reading the report wrong.
08-20-2018, 05:22 PM
#7
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I’m not an expert here but can someone explain to me how you can have more range 4 over revs than range 3.
Report shows 358 over revs in range 4 and only 69 in range 3.
My logic is that you would hit range 3 prior to hitting range 4 so range 3 number should be higher or possibly equal to range 4.
Or or is my logic completely screwed up and I reading the report wrong.
Report shows 358 over revs in range 4 and only 69 in range 3.
My logic is that you would hit range 3 prior to hitting range 4 so range 3 number should be higher or possibly equal to range 4.
Or or is my logic completely screwed up and I reading the report wrong.
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08-20-2018, 05:27 PM
#8
Rennlist Member
GT4 over rev ranges;
1: 7800 - 8000
2: 8000 - 8200
3: 8200 - 8400
4: 8400 - 8600
5: 8600 - 8800
6: 8800 - 9000 or more
Bouncing off the rev limiter (not shifting up before red line) doesn't increment with the SDI9 ECU in the GT4.
Porsche reportedly refuses warranty claims for any range 3 and above, unless it’s been 50 (1), 100 (2) or 200 hours (3) since, not sure what number is accurate.
It cumulatively records revs in each range, but can only record one date, which is when the last one occurred.
1: https://rennlist.com/forums/991-gt3-...l#post15232996
2: https://rennlist.com/forums/porsche-...l#post15230929
3: http://www.911virgin.com/porsche/rev-range-information/
1: 7800 - 8000
2: 8000 - 8200
3: 8200 - 8400
4: 8400 - 8600
5: 8600 - 8800
6: 8800 - 9000 or more
Bouncing off the rev limiter (not shifting up before red line) doesn't increment with the SDI9 ECU in the GT4.
Porsche reportedly refuses warranty claims for any range 3 and above, unless it’s been 50 (1), 100 (2) or 200 hours (3) since, not sure what number is accurate.
It cumulatively records revs in each range, but can only record one date, which is when the last one occurred.
1: https://rennlist.com/forums/991-gt3-...l#post15232996
2: https://rennlist.com/forums/porsche-...l#post15230929
3: http://www.911virgin.com/porsche/rev-range-information/
Last edited by d00d; 09-07-2018 at 08:45 PM.
08-20-2018, 05:45 PM
#9
Rennlist Member
It would make sense that the person missed a downshift, which sent the engine through the ranges just touching 5, further engine braking moved it into 4 where it lingered before the clutch was depressed and revs quickly dropped below 1.
08-20-2018, 05:47 PM
#11
Wow, that's the worst DME report I've ever seen. I'd tell your friend to pass.
08-20-2018, 05:50 PM
#12
The range 5 ignitions were only 20 hours ago. Range 4 ignitions & higher are generally bad.
I'd pass. There are lots of GT4's for sale right now. Probably will be more when the new one arrives.
I'd pass. There are lots of GT4's for sale right now. Probably will be more when the new one arrives.
08-20-2018, 05:55 PM
#13
Rennlist Member
How about this one ...zero over revs ..
https://www.dallasmotorsports.com/20...59?photos=true
I know ..it was mine
https://www.dallasmotorsports.com/20...59?photos=true
I know ..it was mine
08-20-2018, 05:56 PM
#14
Normal bouncing off the rev limiter is range 1, maybe also 2.
Porsche reportedly refuses warranty claims for any range 3 and above.
It cumulatively records revs in each range, but can only record one date, which is when the last one occured.
GT4 over rev ranges;
1: 7800 - 8000
2: 8000 - 8200
3: 8200 - 8400
4: 8400 - 8600
5: 8600 - 8800
6: 8800 - 9000 or more
Porsche reportedly refuses warranty claims for any range 3 and above.
It cumulatively records revs in each range, but can only record one date, which is when the last one occured.
GT4 over rev ranges;
1: 7800 - 8000
2: 8000 - 8200
3: 8200 - 8400
4: 8400 - 8600
5: 8600 - 8800
6: 8800 - 9000 or more
I think this is a great topic of discussion, as much of the info out there is unconfirmed.
I once pinned the limiter for a brief sec (literally was a few tenths of a sec) on my old 991, and was worried about the DME. I then called my shop (a very reputable Porsche race builder I wish to keep unnamed) and asked if I had to worry about anything (overrevs on my DME). I was told, overrevs are only accumulated from downshifting into post rev limiter ranges, ie downshifting while high in rev range, into a pinned rev limit situation.
Another anecdote I will share is with a friend who is a tech in Porsche Service, who used to own a 981S. He is an extremely meticulous tech and car owner, who also pinned the car once or twice and in a paranoid state ran a DME Report (for free, must be nice) and the DME didn't record any overrevs each time.
Lastly, on the 981/991 if you pin the car, the ecu cuts fuel. So I am not sure if this instance records an overrev, I do not believe it does as that is what the fuel cut is for. Finally, the car mentioned above was clearly a track car. Probably by a driver who tracked it with autoblip off and this is most likely what led to the extensive overrev counts.
Lots of conflicting info out there. It would be great if a BGB, SST, HRD, GMG, RS1, or even a dealer could shed some light on the matter and put the myths to rest. For now, I am always careful but I do trust my sources, and believe that pinning will not show on a DME.
08-20-2018, 05:56 PM
#15
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Other than having bogus numbers (ie- 4s being higher than 3s), that's not really a bad reprt at all. Hypothetically, if there were about +50 hours on the DME since the last Range 5 event, the car would most likely be just fine.