Best Track Times in a GT4
09-17-2018, 06:58 PM
#1336
The car has about 17.5k km on it. 90% of those track miles. Once it came back from Europe, it never saw the public roads. It’s a pure race car with a full clone of the Clubsport cage. Therefore no chance of warranty. The only engine related mods I’ve done is a Cobb tune and race headers. There was zero warning and a subsequent review of the MoTeC and PIWIS data showed no over-revs nor any areas of concern.
09-20-2018, 10:27 PM
#1338
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Honestly, nothing to report at the moment. I heard a bucket of bolts as I turned into T1, so I put two feet in and drove it straight off. As I sat there, looking for flames, or a trail of oil, trying to smell for oil or flame, but nothing of the sort could be detected. Then it suddenly occurs to me that the engine wasn’t running.
Once the engine covers overs were removed, we found a small crack in the cast housing cover for the timing chain. We suspect either something broke in the timing chain assembly, or perhaps the cam bolts came loose. Either way, the chain became loose enough to whack its cover and break it.
I’m still mulling over how best to proceed. Tear it down and fix it, or simply replace the engine.
09-21-2018, 08:39 AM
#1339
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There was a similar failure reported here in the GT4 forum about 2 years ago, and it has happened on some 911 cars IIRC. The failure mode I'm referring to is where the bolts that hold the cam sprocket to the camshaft back out and/or shear off. That sounds like what you experienced.
Oh, forgot you are not under warranty...forget all the "they" stuff - I guess they is "you."
10-01-2018, 03:32 PM
#1340
Oregon Raceway Park (ORP) is run both clockwise and counter-clockwise. This is a lap running clockwise, not really comparable to the other posted times for ORP. 1:53.56. Forgelines, suspension bits for camber, R7s, Cargraphic headers. pkh is faster still, I'm sure.
10-01-2018, 05:04 PM
#1341
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It was nice meeting you Sean! You drive well, I wonder if you would feel benefit from getting the upgraded springs.
This is my fastest ORP lap so far CCW which is pretty hilarious because it seemed like disaster through 3-4... I had to make a pass and I think I lost at least a half second when I dropped a wheel before the curbing at 3. Also my fuel warning light flashed right as I was heading down valkyrie hill which scared the crap out of me. I ended the video with some chase action with sk35off. We were pretty running the same pace going flat out which made for an exciting chase.
Oregon Raceway Park CCW 1:50.93 Forgeline 19s RE71R, alignment bits, Tarret spring kit 9/30/18
This is my fastest ORP lap so far CCW which is pretty hilarious because it seemed like disaster through 3-4... I had to make a pass and I think I lost at least a half second when I dropped a wheel before the curbing at 3. Also my fuel warning light flashed right as I was heading down valkyrie hill which scared the crap out of me. I ended the video with some chase action with sk35off. We were pretty running the same pace going flat out which made for an exciting chase.
Oregon Raceway Park CCW 1:50.93 Forgeline 19s RE71R, alignment bits, Tarret spring kit 9/30/18
10-01-2018, 07:38 PM
#1342
That's one hell of a lap around RA. Sorry to hear about your engine.
https://youtu.be/BBNaRVJNsvk
David Murry Track Days at Road America, August 2018. 2:21.74. There was more in the car, just didn't quite get there that weekend. And then the motor let go on me shortly after this.
David Murry Track Days at Road America, August 2018. 2:21.74. There was more in the car, just didn't quite get there that weekend. And then the motor let go on me shortly after this.
10-04-2018, 05:19 PM
#1343
Advanced
Here's my side of pkh's GT4 chase video. I only managed a 1:52.81, but at least I have the excuse that this is the first time I've driven the GT4 at ORP in over a year. That, and the fact that pkh is just plain faster than me. :-) Sdillon made a cameo appearance as well (red GT4), but he had switched to less-sticky street tires.
OP: we really should separate the ORP times into clockwise and counterclockwise.
Oregon Raceway Park CCW 1:52.81, Forgeline 19s RE71R, alignment bits, Tarett (Swift) spring kit, 9/30/2018
OP: we really should separate the ORP times into clockwise and counterclockwise.
Oregon Raceway Park CCW 1:52.81, Forgeline 19s RE71R, alignment bits, Tarett (Swift) spring kit, 9/30/2018
Last edited by ski35off; 10-04-2018 at 06:44 PM. Reason: Correct spelling on 'Tarett'
10-04-2018, 06:33 PM
#1344
Advanced
Utah Motorsports Campus - Outer Loop. First time I've been here, great track.
Utah Motorsport Campus Outer Loop, 2:10.52, Forgeline 19s RE71R, alignment bits, Tarett (Swift) spring kit, 9/15/2018. Warm - 90+ degree ambient.
Utah Motorsport Campus Outer Loop, 2:10.52, Forgeline 19s RE71R, alignment bits, Tarett (Swift) spring kit, 9/15/2018. Warm - 90+ degree ambient.
10-04-2018, 06:35 PM
#1345
Advanced
Utah Motorsports Campus - Full Loop. Ran this configuration the day after I ran the Outer Loop for the first time.
Utah Motorsport Campus Full Loop, 3:19.73, Forgeline 19s RE71R, alignment bits, Tarett (Swift) spring kit, 9/16/2018. Warm - 90+ degree ambient.
Utah Motorsport Campus Full Loop, 3:19.73, Forgeline 19s RE71R, alignment bits, Tarett (Swift) spring kit, 9/16/2018. Warm - 90+ degree ambient.
Last edited by ski35off; 10-04-2018 at 06:35 PM. Reason: Updated date
10-17-2018, 06:41 PM
#1348
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^ At SP, Hoosiers might be worth ~2 secs as compared to RE-71R. Need to compare apples to apples.
10-19-2018, 08:42 AM
#1350
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Just saying a "new record" is essentially for a different class if using a significantly faster tire. The various records should be probably categorized based on tire classes. If I put slicks on the GT4, I suspect that I could set a fastest time at my home track, but I wouldn't really count it as a new record.