any tips suggestions for autocross base 991

What tire pressure to run?

Should i worry of anything like over heating or anything else?

i did autocross before many times but different cars

thanks

 

No overheating issues. You will have a blast - the 991 is a lot of fun to autocross with!

 

I run tire pressures at comfort + 1 PSI (31 / 34) and that seems to work fine.

Never had any overheating issues.

 

YES! Get your engine noise diagnosed and resolved, FIRST.:

https://rennlist.com/forums/991/9555...he-engine.html

 

I hear a whole lotta noise too, with and without pressing the button that makes it louder. I like it!

This thread was a gem, thanks for posting!

 

Read after your engine noise is resolved:

https://rennlist.com/forums/991/8164...-pressure.html

 

In autocross in the club here the runs typically range between 30 seconds and 1 minute so overheating isn't really an issue. It doesn't sound like much, but it is a very busy 30+ seconds. But you've done this before so you know that. I autocross last weekend and my temp sitting idle in Sport Plus before the run was 200 and at the end was 230, so nothing too bad. Note that Sport and Sport Plus lower the ECU's targeted temp for the engine so you should keep the car in one of those to keep the engine cooler.

Here are two very important things to consider though and I see a lot of people do this wrong, especially for high performance engines like ours. First, when your group is getting ready to run, try to start the car early enough that it has time to get to operating temperature before your run. I actually periodically rewarm the engine a bit when my car isn't in the first group so I don't start with a cold engine. As the cars move to the grid, I normally try to come in towards the rear to make sure the engine warms up to operating temperature (and if you are in the first group this allows the other cars to clear off some of the dirt and gravel that might be on the racing line).

Second, after each run do not shut of the engine right away while you wait for your next run to come back around... let the engine idle until the coolant has had time to move the worst of the heat out of the hot spots in your engine. Even the owner's manual advises against shutting off the engine right after a hard run.

As to tire temperatures, in our cars a little less than normal seems to work better than the conventional wisdom of higher pressures you see a lot of cars use. I could see going as low as Jay-S's recommendation, I felt I was nicely balanced last weekend at 33-37 cold but that can vary by a number of variables depending on your car (I would gain 4 PSI during the run). I have PDCC w/SPASM which keeps the car really flat so as I result I currently have a modest -1.0 camber front and -1.5 rear which is right in the middle of factory specs for my model (although factory specs allow limits of -1.3 and -1.9 that I might try next time). Your specs may vary but the dealer's alignment guy can tell you.

 

Thank you all!
it was raining all day, but i am so glad i did this event.
in my group i had 12 cars and i won
Also i talked with porsche owners and i did seat in their car and i do hear same whining noise, i guess it is normal also the smell from the rear of the car also seems very normal with other porsche cars

i use to autocross my c6 corvette and never won, driving my 991 after corvette was so much easier and forgiving
i think my vette made me a better driver

also i go for a ride in older generation S model and it felt like the car had much more power then mine. It was manual and maybe that is what made it feel that way, also the driver was very good

Thank you all once again

 

Hey, that's great!!! Congratulations on the win! Out of curiosity, how many runs did you get in?

On the subject of the C6, I had one of those too and it was a great car for easily-controlled drifting but I agree it wasn't nearly as firmly planted and sure-footed as our cars.

Just an observation: I've reached the conclusion that cars feel faster from the passenger seat... something to do with you not being in control.

I'm also glad you got the chance to experience some other cars and drivers. Sounds like you had a great day... it'll be even better on the next one when the pavement is dry.

 

Thanks
i had 9 runs, and yes i agree regarding being a passenger