I know this has been tossed around many times over the years and I have searched this topic to death but I felt I needed to address my situation a bit more specifically than previous posts. I am days away from committing to new wheels, exhaust, tune and lowering springs with the latter being my hang up....for now. I had planned on installing H&R springs but there seems to be many more 6speeders with GMG springs. Is there a reason for this other than the quality that would make a difference for a DD? Are they more preferred by people who track their cars versus DD? My 997.1TT will likely never see a track and ride comfort is a big deal to me but so is the look of the car. I rode in a TT with H&R and I was pleasantly surprised with the general ride quality while on smooth road but I did feel and hear the slapping sound when going over bumps. Will GMG springs react similarly? Will GMG springs hold the drop height better/longer? Are there any other issues that I should be made aware of or additions that might help (i.e. sways, toe links, dog bone, etc)? If it matters I am leaning towards 20" wheels (def P40's) but I don't know that I would necessarily be disappointed with 19" either. Thanks in advance for the feedback!

 

have you considered techart springs, they are also tested on road and on the track. I was @ 150 and the car was very stable, they also match the spring rate better then the stock, i am sure the gmg are good as well, i think they are slightly stiffer then techart

 

Unfortunately springs, AND coilovers, are one of those mods that most likely you won't know if it's right for you until you've had it in your cars for a few weeks and then drive it in all different scenarios: the city, all-out on open roads, etc.

Of the 3 springs available on market: H&R, Techart, & GMG, the UNCONFIRMED rumor is that H&R is softest, then Techart, then GMG. Don't know who make the other springs (all are reputable), but GMG springs are made by Eibach ("gold standard"). Personally, I would much prefer a proper coilover setup, but if I were to use springs, I would probably pick the stiffest one, in this case either Techart and more likely, GMG, assuming that it is indeed the stiffest. Having tried different spring rates in my car, I would say that yes comfort suffers, but stiffer (within reasons) is almost always better.

Stiffer springs (again, withing reasons) sharpen steering response, decrease roll and squat (front/back and side/side weight transfer); once you've experienced it, IMHO very likely you won't go back. IOW, I believe most Turbo owners will gladly trade the possible loss in comfort for the superior handling, which is not yet proven or compared between the 3 springs anyway.

 

Hr springs did not make any difference in ride quality...However grip and turn in was improved a lot...But then HR sways were installed...and ride quality became worse...

 

What size wheels? 19?

 

I have the TechArt springs and I'm really considering going coilover soon. The ride quality is pretty good but I just feel like the car is too "bouncy" in non-Sport mode. In Sport mode it is pretty good...maybe a tiny bit too stiff for street use. I have a feeling that the GMG (if they are indeed stiffer that the TechArts) would have been perfect for street use in non-Sport mode and perfect for the track in Sport mode.

My car is pretty low with this setup (running 20's as well). I even wonder if I'd get rubbing in the front if I took it to the track.

 

From my experience, the H&R's or any derivative of such as Cargraphic are relatively soft and better ride quality. However, it gets real bouncy and unsettled under certain corner loads. The Eibach springs (GMG) are stiffer and better suited for performance.

If you don't want to ever regret or get second thoughts, a proper coilover setup is the way to go. It doesn't cost a whole lot more and the end result is worth it.

 

I hit the rev limiter in the highest gear few times and the car is scary stable. You only notice the speed when go through other cars in the slow lane.

 

The way to go is a good set of springs ( any of the above), or a proper coilover and turn off the PASM.

 

i love my GMG springs and sways...my car is used on the street only, and on the normal shock setting it is great...complete enhancement in cornering with no roll

some would say the best mod for this car...gmg are made by eibach

 

dymag Cf wheels at OEM 19 size...