Suspension Upgrades - Going for it big styleee! Opinions needed, please!
02-02-2006, 04:55 AM
#16
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Thanks for the advise guys! Keep it coming.... The reason I am contemplating 800lbs front and 525lbs rears are twofold:
1. The car is mostly stock - I have lightened it up a little bit, but I still want my creature comforts - stereo, aircon for the trips to the South of France, the letterbox - oops! I mean sunroof etc. It all adds up I guess
2. The Karussell - I have attached a picture of the car with the stock suspension... If I am to drive it at more than 40mph without leaving my belly pan and oil pan on the concrete banking I need stiff suspension.
On a slightly different note - is there that much difference between the hollow 928Motorsports ARBs and the solid ones supplied by 928Specialists, which would justify the almost double price differential?
The LEDA coilovers are both bump and rebound externally adjustable. With regards to the springs, which come with LEDA I can get whatever rates I want - either one spring, or a progressive set up with a helper spring... The set has a lifetime guarantee...
It's great that so many people are helping with their experience!!! Again, thank you very much!!!
Lastly, I am not attempting to set a record at the Ring, it is more of a challenge to myself. But I would also admit that teachning a lesson to a few 911s and M3s is also enjoyable every now and then
1. The car is mostly stock - I have lightened it up a little bit, but I still want my creature comforts - stereo, aircon for the trips to the South of France, the letterbox - oops! I mean sunroof etc. It all adds up I guess
2. The Karussell - I have attached a picture of the car with the stock suspension... If I am to drive it at more than 40mph without leaving my belly pan and oil pan on the concrete banking I need stiff suspension.
On a slightly different note - is there that much difference between the hollow 928Motorsports ARBs and the solid ones supplied by 928Specialists, which would justify the almost double price differential?
The LEDA coilovers are both bump and rebound externally adjustable. With regards to the springs, which come with LEDA I can get whatever rates I want - either one spring, or a progressive set up with a helper spring... The set has a lifetime guarantee...
It's great that so many people are helping with their experience!!! Again, thank you very much!!!
Lastly, I am not attempting to set a record at the Ring, it is more of a challenge to myself. But I would also admit that teachning a lesson to a few 911s and M3s is also enjoyable every now and then
02-02-2006, 06:29 AM
#17
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Hi,
I have a 90 GT with Leda shocks and Eibach springs. The nice thing about the Leda setup is that it's easy to adjust. When driving on public roads I set it to soft which makes it ok to ride on public roads. I'm running 800lbs front and 525 at the rear, I believe that this would be ok on the ring. If you go with softer or harder springs, keep in mind to keep the ratio at about 1.5 between them.
If you decide to go with the Leda setup, I would recommend helper springs and gas shocks.
I have a 90 GT with Leda shocks and Eibach springs. The nice thing about the Leda setup is that it's easy to adjust. When driving on public roads I set it to soft which makes it ok to ride on public roads. I'm running 800lbs front and 525 at the rear, I believe that this would be ok on the ring. If you go with softer or harder springs, keep in mind to keep the ratio at about 1.5 between them.
If you decide to go with the Leda setup, I would recommend helper springs and gas shocks.
02-02-2006, 10:34 AM
#18
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Originally Posted by Rehan
Hi,
I have a 90 GT with Leda shocks and Eibach springs. The nice thing about the Leda setup is that it's easy to adjust. When driving on public roads I set it to soft which makes it ok to ride on public roads. I'm running 800lbs front and 525 at the rear, I believe that this would be ok on the ring. If you go with softer or harder springs, keep in mind to keep the ratio at about 1.5 between them.
If you decide to go with the Leda setup, I would recommend helper springs and gas shocks.
I have a 90 GT with Leda shocks and Eibach springs. The nice thing about the Leda setup is that it's easy to adjust. When driving on public roads I set it to soft which makes it ok to ride on public roads. I'm running 800lbs front and 525 at the rear, I believe that this would be ok on the ring. If you go with softer or harder springs, keep in mind to keep the ratio at about 1.5 between them.
If you decide to go with the Leda setup, I would recommend helper springs and gas shocks.
02-02-2006, 04:02 PM
#19
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Our cars have 0.5 as gearing at the rear which is pretty much. The movement at the shock can make the oil in the shock to boil, the gas in it will prevent the oil from boiling, this is the reason to go with the gas filled shock.
02-02-2006, 04:15 PM
#20
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Correct gas shocks are high pressure gas over oil, oil does all the work! As stated the gas works just like a pressure cooker it elevates the" boiling point" suppresses the formation of foam , bubbles and yes I do own a pressure cooker...
02-02-2006, 05:53 PM
#21
Drifting
go for the leda shocks, it seems the konis wont suit the stiffer spring range. my choice to use bilsteins was based on price at the time. next suspension upgrade for me will be to fixed rate springs with leda shocks. im not sure what the difference is between the two sway bar setups but i do know that both carl and dr are decent guys who go out of there way to help and support customers. the good thing is that if the spring rates are too high you can buy softer ones (or harder) without trouble as they are the smaller diameter type.
02-02-2006, 07:25 PM
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I've ordered the hollow sway bars from Carl. I don't want to add more weight to the car so that's the reason to go for the sway bars from Carl.
Is it worth the price difference? For me yes, for you? I might think so as you have already removed some weight.
Is it worth the price difference? For me yes, for you? I might think so as you have already removed some weight.
02-02-2006, 07:28 PM
#23
Three Wheelin'
Originally Posted by Cheburator
Thanks for the advise guys! Keep it coming.... The reason I am contemplating 800lbs front and 525lbs rears are twofold:
<snip>
On a slightly different note - is there that much difference between the hollow 928Motorsports ARBs and the solid ones supplied by 928Specialists, which would justify the almost double price differential?
<snip>
<snip>
On a slightly different note - is there that much difference between the hollow 928Motorsports ARBs and the solid ones supplied by 928Specialists, which would justify the almost double price differential?
<snip>
02-02-2006, 08:44 PM
#24
600/400 springs make Koni's at thier limit? You mean they will wear out faster? Not control movement? Should I have my koni's revalved?
Originally Posted by blau928
Nick,
Very good point.. & I live in CA.. Granted the roads in Germany are very nice.. I think in the UK you'd have to share the painkillers with Cheburator with 800/550 springs..
Cheburator,
IMHO, the External Adj Koni's cannot control the springs > 600/400... Leda or Penske etc would be better.. Unless the Koni's were revalved.
On my 600/400 setup, they are at their limit.. Granted, just my opinion....
800 fronts must be super stiff.. MK can comment, I think he runs 800 or 750 on his front suspension on the Holbert Race Car..
HTH
Very good point.. & I live in CA.. Granted the roads in Germany are very nice.. I think in the UK you'd have to share the painkillers with Cheburator with 800/550 springs..
Cheburator,
IMHO, the External Adj Koni's cannot control the springs > 600/400... Leda or Penske etc would be better.. Unless the Koni's were revalved.
On my 600/400 setup, they are at their limit.. Granted, just my opinion....
800 fronts must be super stiff.. MK can comment, I think he runs 800 or 750 on his front suspension on the Holbert Race Car..
HTH
02-02-2006, 09:02 PM
#25
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Brendan,
I cannot comment about wear, as the Koni/Hypercoil Pkg. I have is relatively new.
However, what I was referring to was the ability of the shock to control the spring with such a stiff setup. The rears are at max rebound stiffness, and are just adequate at 400# spring rate. The fronts need to be turned up a notch to get the last bit of springy-ness out, and are at 90% stiff rebound curently with 600# spring rate.
This is why I think if you use a spring greater than 600/400 the control will not be there unless the Koni's are revalved.. I would like to have the Ledas or Penske when it comes time to change them next round, as I would be able to adjust the compression.
This car is a Street Car, and I will DE the car from time to time. On a race car, I would either get a pkg that I can adjust Reb & Comp., or get a set of custom valved shocks that are valved for the car and spring rate taking into account a corner balance on the wet weight (1/2 tank gas and me in the pilot seat).
HTH,
I cannot comment about wear, as the Koni/Hypercoil Pkg. I have is relatively new.
However, what I was referring to was the ability of the shock to control the spring with such a stiff setup. The rears are at max rebound stiffness, and are just adequate at 400# spring rate. The fronts need to be turned up a notch to get the last bit of springy-ness out, and are at 90% stiff rebound curently with 600# spring rate.
This is why I think if you use a spring greater than 600/400 the control will not be there unless the Koni's are revalved.. I would like to have the Ledas or Penske when it comes time to change them next round, as I would be able to adjust the compression.
This car is a Street Car, and I will DE the car from time to time. On a race car, I would either get a pkg that I can adjust Reb & Comp., or get a set of custom valved shocks that are valved for the car and spring rate taking into account a corner balance on the wet weight (1/2 tank gas and me in the pilot seat).
HTH,
02-02-2006, 09:12 PM
#26
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As spring rates increase there is a need for stiffer shocks to control their movement but stiff springs have less movement as well so it is not as simple as it seems. Interestingly enough corner entry understeer can be caused by "insuffificient front roll stiffness" or "excesive front roll stiffness (spring or bar) " Per Carrol Smith... Engineer in your pocket copyright 1998.
02-02-2006, 09:16 PM
#27
Thanks Richard. I am waiting on the rest of the Devek Hypercoil spring and-stuff kit, so that I can put it on the stripped 89. I need to make sure its high performance enough to properly it in the garage for another year. 
Seriously, knowing how stiff the (fr)Eibach/(r)FrontS4 springs and Bilsteins were on the car I was able to put them on, I am concerned about harder shocks then the Konis with 600/400 hypercoils. I'll only know for sure when I am able to drive on them.
Seriously, knowing how stiff the (fr)Eibach/(r)FrontS4 springs and Bilsteins were on the car I was able to put them on, I am concerned about harder shocks then the Konis with 600/400 hypercoils. I'll only know for sure when I am able to drive on them.
Originally Posted by blau928
Brendan,
I cannot comment about wear, as the Koni/Hypercoil Pkg. I have is relatively new.
However, what I was referring to was the ability of the shock to control the spring with such a stiff setup. The rears are at max rebound stiffness, and are just adequate at 400# spring rate. The fronts need to be turned up a notch to get the last bit of springy-ness out, and are at 90% stiff rebound curently with 600# spring rate.
This is why I think if you use a spring greater than 600/400 the control will not be there unless the Koni's are revalved.. I would like to have the Ledas or Penske when it comes time to change them next round, as I would be able to adjust the compression.
This car is a Street Car, and I will DE the car from time to time. On a race car, I would either get a pkg that I can adjust Reb & Comp., or get a set of custom valved shocks that are valved for the car and spring rate taking into account a corner balance on the wet weight (1/2 tank gas and me in the pilot seat).
HTH,
I cannot comment about wear, as the Koni/Hypercoil Pkg. I have is relatively new.
However, what I was referring to was the ability of the shock to control the spring with such a stiff setup. The rears are at max rebound stiffness, and are just adequate at 400# spring rate. The fronts need to be turned up a notch to get the last bit of springy-ness out, and are at 90% stiff rebound curently with 600# spring rate.
This is why I think if you use a spring greater than 600/400 the control will not be there unless the Koni's are revalved.. I would like to have the Ledas or Penske when it comes time to change them next round, as I would be able to adjust the compression.
This car is a Street Car, and I will DE the car from time to time. On a race car, I would either get a pkg that I can adjust Reb & Comp., or get a set of custom valved shocks that are valved for the car and spring rate taking into account a corner balance on the wet weight (1/2 tank gas and me in the pilot seat).
HTH,
02-03-2006, 02:56 PM
#28
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Thread Starter
Originally Posted by Rehan
Our cars have 0.5 as gearing at the rear which is pretty much. The movement at the shock can make the oil in the shock to boil, the gas in it will prevent the oil from boiling, this is the reason to go with the gas filled shock.
Spring rates to be determined yet, but in all likeliness will go with 800/525...Now, I need the ARBs and the A-arm poly bushes... God! I swear that my sharks have money sensors built in them, the minute I get some cash, it just evaporates and then as if by miracle is found under one form or another on the cars
P.S. I can buy a set of front 928 Specialists steroid drop links second hand from a friend in the UK... How much of an improvement are the ARBs on sale now vs the original steroids?
Thanks
02-03-2006, 03:11 PM
#30
Three Wheelin'
Cheburator,
I have been searching for this info for some time, and it looks like you have it. What was the factory ring time for the 928? Do you have the times for the different models / years?
Thanks (I say, green with envy)
I have been searching for this info for some time, and it looks like you have it. What was the factory ring time for the 928? Do you have the times for the different models / years?
Thanks (I say, green with envy)