View Poll Results: What should I do?
Leave the car alone and keep it stock
0
0%
Use the 325 & 575's and dial it in over time
2
8.33%
Buy the M030 springs from Gert and finish it now
12
50.00%
Tear the interior out, weld in a cage and turn it into a track beastie!
10
41.67%
Voters: 24. You may not vote on this poll
HELP!...Suspension/spring/balance question?
Thread Starter
Drifting
Joined: Aug 2005
Posts: 2,031
Likes: 5
From: San Diego, CA
HELP!...Suspension/spring/balance question?
I have purchased (from a local racer friend) a set of 4 Bilstein HD's with Eibach 325lb front and 575lb rear springs. (I won't say how much I paid or you'll all hate me 
)
This suspension was originally built by David Taylor (who was at TRG at the time, now back in New Zealand from what I hear) for a 96' 993 C4 to C2 conversion chassis and the spring rate difference was intended to dial out some understeer and get the car more neutral, it worked very well with 235 & 295 18's & big sway bars (TRG adjustables)
I just took the shocks to Bilstein here in San Diego and had them rebuilt to a rebound and compression rate more suited to the street and wanted to know if any of you would have opinions on running the 325 & 575 lb springs with my stock sway bars (21 & 17) and stock 205 & 255 17's.
It seems to me as long as I keep a similar tire size difference I might acheive similar neutral turn in results but the sway bars are an unknown factor, any suggestions on the sways?
Would any of you just install M030 ROW springs from Gert and can the 325 & 575's?
I'm a very aggressive driver and will track the car at a few DE's for giggles, so I don't want it too soft but I also don't want the full track car ride either.
Oh yea, I'm setting the new ride height at RS +5mm........
Other than that, I think I have it under control........
PS; the poll is for our amusement and yes, I voted to tear the interior out & weld in a cage but don't tell my wife
)This suspension was originally built by David Taylor (who was at TRG at the time, now back in New Zealand from what I hear) for a 96' 993 C4 to C2 conversion chassis and the spring rate difference was intended to dial out some understeer and get the car more neutral, it worked very well with 235 & 295 18's & big sway bars (TRG adjustables)
I just took the shocks to Bilstein here in San Diego and had them rebuilt to a rebound and compression rate more suited to the street and wanted to know if any of you would have opinions on running the 325 & 575 lb springs with my stock sway bars (21 & 17) and stock 205 & 255 17's.
It seems to me as long as I keep a similar tire size difference I might acheive similar neutral turn in results but the sway bars are an unknown factor, any suggestions on the sways?
Would any of you just install M030 ROW springs from Gert and can the 325 & 575's?
I'm a very aggressive driver and will track the car at a few DE's for giggles, so I don't want it too soft but I also don't want the full track car ride either.
Oh yea, I'm setting the new ride height at RS +5mm........
Other than that, I think I have it under control........
PS; the poll is for our amusement and yes, I voted to tear the interior out & weld in a cage but don't tell my wife
Addict
Rennlist Member
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Joined: May 2001
Posts: 12,823
Likes: 785
You are starting off w/ a lot of built in understeer w/ that tire combination, 325/575 springs will dial that back and more can be dialed out w/ TRG sways.
it may or may not be enough, but it also depends on what you want.
For some info on spring rates others are using you might want to look here
it may or may not be enough, but it also depends on what you want.
For some info on spring rates others are using you might want to look here
Racer
Joined: Feb 2006
Posts: 488
Likes: 1
From: Long Beach, CA
The stock M030 springs and bars induce understeer with stock 17" wheel sizes (IMHO). I'd go ahead and stick those springs on and see how they do. You can always rebalance by adding an M030 rear bar (for more oversteer) or front bar (for more push). Or both.
Nordschleife Master
Joined: Jun 2005
Posts: 5,351
Likes: 9
From: Neither Here Nor There
Originally Posted by ZombiePorsche44
Oh yea, I'm setting the new ride height at RS +5mm........
(nota a scrape yet)
Addict
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Rennlist Member
Joined: Jun 2003
Posts: 2,304
Likes: 5
From: Boulder, CO
ALIGNMENT will have a big difference in balance too. If you stray a little from RS settings for camber and go equal front to back or a little more (negative) in front, that has a big effect on reducing understeer, especially corner-entry understeer that the 993 in stock form has. Go visit Jae Lee at Mirage, he'll do a great job (best in town).
Rennlist Member
Joined: Apr 2002
Posts: 327
Likes: 1
From: Laguna Niguel, CA
I had terrible understeer at the track in my C4S until I put on the bigger TRG adjustable sways. These bars completely transformed the cars handling to perfectly neutral.. I love the current set up and would highly reccommend it. I have Bilstein HDs and MO30 spring compression.
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Thread Starter
Drifting
Joined: Aug 2005
Posts: 2,031
Likes: 5
From: San Diego, CA
Thank you for all of your replys and votes.
I have decided to keep the 325's in front, can the 575's and install 450's in the rear and add turbo sway bars F & R. I feel this will give me the most bang for the $ at this time and if I don't like the sways I can change them out without a re-balance and alignment.
By the way, my wife saw the option for turning the car into a track beastie and let me know it was OK to do that, right after the divorce is final....LOL
Thanks again and I'll let you know how it turned out by the end of next week.
ZP44
I have decided to keep the 325's in front, can the 575's and install 450's in the rear and add turbo sway bars F & R. I feel this will give me the most bang for the $ at this time and if I don't like the sways I can change them out without a re-balance and alignment.
By the way, my wife saw the option for turning the car into a track beastie and let me know it was OK to do that, right after the divorce is final....LOL
Thanks again and I'll let you know how it turned out by the end of next week.
ZP44
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