The bad part of Super Charging

I also drive the 928.....quite quick

I've had every cover off the engine and alls fine; crank, cams, rods, etc etc...........its not superchargerd but it has seen 260 kph a few times.

I am not an expert.
I have blown a few up.
Always rod bearing issues.
Always a track driven car, on track (sticky) tires.
Always on tracks with long corners.
I may have pushed to 6300+, probably not too much more.
I had an accusump configured as a pre-oiler and also to provide a surge of oil in the case of a lapse of oil pressure.
The motors I blew were all 5L bottom ends with Euro S 16v top ends.
I always spun a rod bearing.
I was using Amsoil.

I think it would be difficult to do so on the street and not lose your license

I suspect much of the blame can be laid at my feet as I assembled my motors with the oversight of one who had done so before me (and perhaps lacked the desired level of expertise and/or caution).

Stan.Shaw@Excell.Net;4009 wrote: I think it would be difficult to do so on the street and not lose your license

.

Cant go any faster.........believe me I tried (closed roads of course etc etc)

It isn't a question of fast, but sustaining the speeds and rpms, through sweeping corners, over and over again for about 20 minutes, perhaps four times per day.

I am not disputing whether you have done it, but rather just clarifying my experience.

I agree with Stan for the most part...save the one person I know who blew his up Auto-X'ing. Now it is possible that they had a unique Auto-X course with some long corners, but that would be unusual since runs are rarely more than 1 minute in Auto-X.

On track, high revs, long corners with no breaks and you do it lap after lap after lap... that is what kills them. You just can't do that kind of stuff on the street and not be carted off to jail!

928mac;4006 wrote: Oh God this is getting interesting and I have to get in here.

I agree with Austin that a moderately driven car, even sometimes hard, should have no worries.

I need clarification on the Amsoil please Austin because I was going to use it to reduce cam ware.
Its ZD factor

I am also curies James as to the GT failures that you are talking about.
Is it main bearing, rod, wrist pin or piston failure and why you heard they fail.

Guys I drive this car like I stoled it and so I am trying to head some of these issues off because I don't want to blow it up.

hmm I asked more then I told

Brad, I was only meaning to tease Mark K from Rennlist who never misses a chance to boast that his track car has successfully used the stock oiling system for some time now. He credits the Amsoil 20W-50 for his longevity. I wasn't knocking Amsoil at all. Amsoil is an exceptional oil. Perhaps the best available. I just don't necessarily endorse the idea that Amsoil alone will make your 928 oiling system track prepped.