Best Track Times in a GT4
08-08-2018, 05:08 PM
#1321
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The DSC helps but the TPC toe links and a good alignment will cure the instability under braking....if you later add the DSC they have a specific MAP for cars with TPC toe links that even compensates for front end dive during heavy braking....you are going to love the combo.
08-08-2018, 07:58 PM
#1322
08-08-2018, 10:55 PM
#1323
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08-09-2018, 03:48 PM
#1325
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Will do for GT4. I should clarify that the issue at Summit Point is actually worse with the GT3, maybe due to the different weight distribution, higher spring rates, etc. So plan is to try the DSC box in the GT3, and start with the toe links and alignment in the GT4.
09-15-2018, 12:02 AM
#1328
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Road America - 2:21.74- 30 Aug 2018 - Pirelli slicks - Mono-ball Suspension
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.
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phefner (12-29-2020)
09-15-2018, 02:45 AM
#1329
09-16-2018, 01:42 AM
#1331
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09-16-2018, 06:39 PM
#1332
09-17-2018, 01:41 PM
#1333
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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.
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.
09-17-2018, 02:48 PM
#1334
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.
Well that's pretty nasty. Sorry to hear about it. Any idea how many track miles on your GT4? What's your expectation re whether this is covered under warranty? Curious to hear the paths you choose-good luck with a speedy recovery for the car.
09-17-2018, 03:55 PM
#1335
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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.