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Yesterday, 10:30 PM
Replies: 3,019
Views: 727,918
Posted By Petevb

https://cimg9.ibsrv.net/gimg/rennlist.com-vbulleti...

https://cimg9.ibsrv.net/gimg/rennlist.com-vbulletin/2000x1250/698a6678_b22b_4e35_b783_9978f45794d4_c3c9eb35bb49fce0d1fbbb8589a3e80d18feb743.jpeg
Forum: 718 Forum
07-16-2019, 02:09 AM
Replies: 36
Views: 2,857
Posted By Petevb

There is more than an element of truth to this....

There is more than an element of truth to this. BMWs cost significantly more in their native Germany than they do in the US for good reason: due to strict TUV regulations and incentives cars in...
Forum: 718 Forum
07-15-2019, 09:49 PM
Replies: 36
Views: 2,857
Posted By Petevb

[/color] And older Porsche engineering? Is that...

[/color]
And older Porsche engineering? Is that a 944 Turbo I see in your stable? A water pump that’s a time change item, ditto the cam timing belt. The head gasket as well if you track regularly....
Forum: 718 Forum
07-15-2019, 08:13 PM
Replies: 36
Views: 2,857
Posted By Petevb

Having designed parts that reside in tens of...

Having designed parts that reside in tens of millions of cars myself out of (gasp!) plastic I guess I do. And while I don’t currently work in the automotive industry I do design parts that need to...
Forum: 718 Forum
07-15-2019, 05:53 PM
Replies: 36
Views: 2,857
Posted By Petevb

Because I have actual data instead of F.U.D. I...

Because I have actual data instead of F.U.D. I personally know of over a half dozen early failures of the sintered metal gears in the 997 GT3 oil pump. It’s a known weak point, one the factory...
Forum: 718 Forum
07-15-2019, 02:57 PM
Replies: 36
Views: 2,857
Posted By Petevb

This thread is about the integrated dry sump pan...

This thread is about the integrated dry sump pan which changed to plastic. But it sounds like you’d prefer the sintered metal oil pump gears in the 997.2 GT3 that disintegrated gears and took out...
Forum: 718 Forum
07-15-2019, 04:16 AM
Replies: 36
Views: 2,857
Posted By Petevb

All plastic is not created equal. Teflon is good...

All plastic is not created equal. Teflon is good to over 400 degrees, ETFE is impervious to UV, thermosets can be both stable at temperature and impervious to creep.

A quick search says Porsche is...
Forum: GT4
07-15-2019, 03:27 AM
Replies: 8,355
Views: 2,199,502
Posted By Petevb

Lap time difference is about what you’d expect...

Lap time difference is about what you’d expect given Porsche’s typical progression, about 1/2 of which is down to tires. 460 (981 GT4) to 448 seconds for reference...
...
Forum: GT4
07-15-2019, 03:14 AM
Replies: 8,355
Views: 2,199,502
Posted By Petevb

997.2 GT3 RS equivalent ratios would work great....

997.2 GT3 RS equivalent ratios would work great. No inefficient jumps or lowered top speed vs the GT4, and the shorter 2nd gear didn’t hurt that car at on the track in the slightest. I also don’t buy...
07-11-2019, 06:55 PM
Replies: 123
Views: 34,444
Posted By Petevb

Which goes to my point- with Balance of...

Which goes to my point- with Balance of Performance rules what’s the real benefit of reduced drag? Any increase in outright lap speed will be taken away again. Any improvement in fuel efficiency is...
07-06-2019, 02:02 PM
Replies: 123
Views: 34,444
Posted By Petevb

The aftermarket has been building 4.4+ liters for...

The aftermarket has been building 4.4+ liters for a while, and clearly Porsche could have gone to 4.2 earlier if they wanted to. Currently going past 4.2 doesn’t seem to make sense for them however...
07-03-2019, 01:11 AM
Replies: 41
Views: 5,174
Posted By Petevb

An engineer at Porsche once confided that one of...

An engineer at Porsche once confided that one of the most challenging aspects of the modern 911 is the design of the rear tires. They are absolutely critical to making the rear engine layout viable,...
07-01-2019, 06:07 PM
Replies: 41
Views: 5,174
Posted By Petevb

Scary. 250 kph isn't nearly as fast as it could...

Scary. 250 kph isn't nearly as fast as it could have been- I used to see those speeds regularly in my M3. But the curve gets steep from there up in terms of downforce load, etc. Any idea exactly what...
07-01-2019, 05:31 PM
Replies: 41
Views: 5,174
Posted By Petevb

What camber was he running? Hypothesis: high...

What camber was he running?

Hypothesis: high downforce at speed increases load on the tires. Higher camber would focus that load on the inside edges, working the tire carcass and potentially...
Forum: GT4
06-26-2019, 11:01 AM
Replies: 82
Views: 14,130
Posted By Petevb

When I sold my GT4 and replaced it with a GT3...

When I sold my GT4 and replaced it with a GT3 gearing was one of the main (if not the #1) reason I did so. I know a number of us did the same, enough so that it might be interesting to ask the same...
06-21-2019, 04:00 PM
Replies: 63
Views: 8,674
Posted By Petevb

We actually did a pretty good job crowd-sourcing...

We actually did a pretty good job crowd-sourcing a very similar answer back in 2015:...
Forum: 991
09-12-2015, 12:44 AM
Replies: 179
Views: 67,502
Posted By Petevb

991.2 9A2 engine vs 9A1 technical analysis

Enough information is coming in on the new 9A2 turbo engine fitted to the 991.2 911S to compare it to the outgoing 9A1 and previous Porsche engines. The picture that emerges is of a relatively...
Showing results 1 to 17 of 17


 
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