Tip to reducing understeer for 997.1 turbo

IMI A · 19 Dec 2014

As most of you are aware 997 turbos generally understeer and it takes away from the driving experience. I basically lived with it for 8 years.

Recently I upped the width of the wheels to 8.75 x 19 and 12 x 19. Tyres also need to be wider so moved to 245 35 19 and 325 30 19 respectively.

My cars been lowered by -20mm with H&R lowering springs and GT2 anti roll bar at the rear.

The end result is no understeer.

Most of you probably already know this but for those that have not done this upgrade the end result is truly transformational. My car can now handle the odd track day no problem at all. I think the key to curing the problem are the wider front section tyre and rear GT2 anti roll bar :thumbs:

infrasilver · 19 Dec 2014

I found upgrading the rear anti roll bar on my Audi S4 V8 to an RS4 one cured understeer, it could be the same principle without going wider on the wheels although wider fronts will help.

IMI A · 19 Dec 2014

I think its probably a combination of both on the 997 turbo. 9e carried out a fast road geo and its also running some negative camber. For a heavy car it has no right to handle as well as it does now. Really threw the car at corners on track at ridiculous entry speeds and ABS would trigger occasionally but apart from that car was still very tidy and composed :thumb:

isysman · 19 Dec 2014

I have zero understeer in my car. I had wider wheels fitted on the front 9"x19" front but with same width tyres as before (235s) and lowered it and had geo done.

I've had H&R anti roll bars fitted but I haven't driven the car since.

Martian · 21 Dec 2014

When I bought my car at two years old, it had the standard OPC understeer geo' which I wasn't happy with.

A trip to Center Gravity and a chat with Chris with my requirements meant I left with a car that had no understeer and could be provoked to oversteer with the right foot.

Car is on standard wheels and suspension and is so much more alive than before.

If anyone would like my geo' settings, I'll post up the print out when I get home.

michelin · 21 Dec 2014

You can't beat Chris @ Centre Gravity

Martian said:
When I bought my car at two years old, it had the standard OPC understeer geo' which I wasn't happy with.

A trip to Center Gravity and a chat with Chris with my requirements meant I left with a car that had no understeer and could be provoked to oversteer with the right foot.

Car is on standard wheels and suspension and is so much more alive than before.

If anyone would like my geo' settings, I'll post up the print out when I get home.

:thumb:

Roro · 21 Dec 2014

+2 for Chris and team @ CG :thumb:

Martian · 21 Dec 2014

But TBH, I'm equally impressed by the geo' 'tune up' at PSR in Bishops Stortford.

IMI A · 21 Dec 2014

Chris has set my car up twice and it was a huge improvement but not transformational. Only happens when you're driving at 9/10ths so on road you'll never notice the understeer unless you're driving like a lunatic

DynoMike · 21 Dec 2014

Martian said:
When I bought my car at two years old, it had the standard OPC understeer geo' which I wasn't happy with.

A trip to Center Gravity and a chat with Chris with my requirements meant I left with a car that had no understeer and could be provoked to oversteer with the right foot.

Car is on standard wheels and suspension and is so much more alive than before.

If anyone would like my geo' settings, I'll post up the print out when I get home.

Though mine is a 996 Turbo, not a 7.1, this is pretty much the result I got too.

Though, as IMI has said, it will understeer if I am A; lazy with my inputs, expecting the car to sort it out (i.e. not weighting the front properly on corner entry), or B; on hard acceleration out of an unfolding corner. There, it just squats too much so pushes the front until I have a tiny release on the throttle to bring it back to heel.

But that is what I absolutely love about the 911, it is so adjustable to both input from the driver and tweaks to the set up. Fantastically sensitive cars, which is amazing considering the basic architecture, with the engine hanging out of the back. Incredible.

Ekona · 21 Dec 2014

Martian said:
But TBH, I'm equally impressed by the geo' 'tune up' at PSR in Bishops Stortford.

This man speaketh the truth. Both Chris at CG and Paul at PSR are masters of their craft, and I used both on multiple occasions.

911UK · 22 Dec 2014

IMI A said:
As most of you are aware 997 turbos generally understeer and it takes away from the driving experience. I basically lived with it for 8 years.

Recently I upped the width of the wheels to 8.75 x 19 and 12 x 19. Tyres also need to be wider so moved to 245 35 19 and 325 30 19 respectively.

My cars been lowered by -20mm with H&R lowering springs and GT2 anti roll bar at the rear.

The end result is no understeer.

Most of you probably already know this but for those that have not done this upgrade the end result is truly transformational. My car can now handle the odd track day no problem at all. I think the key to curing the problem are the wider front section tyre and rear GT2 anti roll bar :thumbs:

Changing Tyre Sizes is one way but Tyre pressures will also play a factor.

Ultimately changes in the suspension Geometry setting aligned to Anti Roll Bar changes is what makes a difference.

IMI A · 22 Dec 2014

Proof is in the pudding. It handled track duties with ease. I've had the car from new and in 8 years never bothered taking it on track until a few weeks ago as thought it would be average due to excessive weight. Its still too heavy for more than one or two track days a year but the changes to suspension, wheels and tyre set up really help it hide its weight well on track. If you look at these pics very little body roll for a 1585kg beast.

Roro · 22 Dec 2014

Love the wheels! Are they BBS FI?

IMI A · 22 Dec 2014

Roro said:
Love the wheels! Are they BBS FI?

yes they are superb - highly recommended :thumbs:

Tip to reducing understeer for 997.1 turbo

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