150 mph at WG lap after lap, rock stable, check your tire pressure(hot) and alignment. Maybe you're not used to 500hp?? ... yet

 

hah mines not stock

 

100mph onLY !!!!!! come on

 

You should check the Alignment, and tire pressure. I have had the 997TT up to 187, and it felt pretty stable all the way there. however at those high speeds it will begin to get a little light. However at 100 you should be fine. If you feel like you need added suction or downforce, I recommend that you get front and rear diffusers (I like the ones from WERKS).

 

the only time I felt my front end get floaty was when I hammered it on a bridge that was on the bumpy side(114mph)

 

Must be an alignment/tire pressure issue. It took 3 alignments before I was satisfied with my car. Had all sorts of "floaty" issues at speed around sweepers etc. I still do but nowhere near as bad (car is still stock). Now on the straights it was rock solid at 150mph. 100mph is barely crusing speed on this car. Have it looked at. When my car was not aligned properly I also felt crosswinds affecting the car more. Now its much better. Alignment is critical in these high performance AWD cars (along with proper tire pressures).

 

Ya a race alignment I am sure would help alot, however I have a racecar for that. Being on a track was more a one time thing for my 997

 

I am routinely at 150-165mph on the straights of my local track, and with the correct toe front and rear the car feels like I am doing 40mph. There are no steering issues. Another thing to check is your wheel balance as well. Make sure they get done on a higher end machine.

 

you need a better spoiler...

 

That would make it worse

 

I'm in Dubai, and even on the 8 lane expressway (where crosswinds are severe) I have no problems - even at 120 mph the car feels beyond solid and planted

 

That is just too funny

 

Right on the money, alignment issue, almost 99% it is!

 

The problem is resolved. We had strong gusty winds in Qatar for a little over a week. Now that the winds have died down, the car is solid as a rock. I am still somewhat surprised as to how much the car's stability is affected by around 40mph sidewinds.

 

I am surprised you are testing high speed stability in light of 40 mph crosswinds. That's not something I would be keen on doing.