GT4 Multi-Link Rear Suspension Kit.
Discussion
If I were regularly tracking a GT4 I may look at it. The rear suspension hardware is the first place that I'd look to improve. The GT4's that I've driven on track have all been 'uncomfortable' at 10/10ths especially on high speed downhill loaded corners like Eu rouge where the issue is really pronounced. I'm sure that The next version of the car will resolve this. I know that Manthey were looking at it very soon after the launch of the GT4. Do they have a kit now?
This kit has a high number of rose joints. On the one hand, they give excellent control through the arc of movement and allow a fine level of adjustability- which is great for the track. On the other hand, rose joints are not great on the road. They are susceptible to corrosion and more concerning can be damaged by pot hole impacts as they do not dissipate load like a flexible bush and can fail. This can lead to catastrophic suspension failure. I have rose joints fitted to the spring plates of my 964 but only 1 per plate. The rest of the components are bushed which will help spread impact loads and reduce the isolation of impact damage to the Rose joints.
I definitely come from the more 'hardcore" driving experience camp but If I owned a GT4 I think that I'd be looking for something more compromising as a solution
This kit has a high number of rose joints. On the one hand, they give excellent control through the arc of movement and allow a fine level of adjustability- which is great for the track. On the other hand, rose joints are not great on the road. They are susceptible to corrosion and more concerning can be damaged by pot hole impacts as they do not dissipate load like a flexible bush and can fail. This can lead to catastrophic suspension failure. I have rose joints fitted to the spring plates of my 964 but only 1 per plate. The rest of the components are bushed which will help spread impact loads and reduce the isolation of impact damage to the Rose joints.
I definitely come from the more 'hardcore" driving experience camp but If I owned a GT4 I think that I'd be looking for something more compromising as a solution
Steve Rance said:
The GT4's that I've driven on track have all been 'uncomfortable' at 10/10ths especially on high speed downhill loaded corners like Eu rouge
Not surprised it was uncomfortable given you were going the wrong way ;-)Interesting observation though - when I took my GT4 round the 'Ring earlier in the year it definitely felt less stable down the Fuchsrohre section than my 964RS
nudgerwilliams said:
Not surprised it was uncomfortable given you were going the wrong way ;-)
Interesting observation though - when I took my GT4 round the 'Ring earlier in the year it definitely felt less stable down the Fuchsrohre section than my 964RS
Eau Rouge is downhill. Radillon is uphill.Interesting observation though - when I took my GT4 round the 'Ring earlier in the year it definitely felt less stable down the Fuchsrohre section than my 964RS
What always worries me with these kind of aftermarket kits is have they had the same level of stress calculations, and more importantly testing to corroborate those figures, that a production part would? I don't think that FEA from a 3D CAD system model is usually not taken as gospel in suspension applications. But it's been 25 years since I was involved in that kind of thing so I could be wrong.
Or when you buy specialist parts like this do they make it clear you are buying something with limited liability?
Not trying to slag it off, as David knows I've had cars modified in the past but was always circumspect with suspension and running gear. Fatigue can make a part fail quite rapidly or at least unexpectedly. As Steve points out is it suitable for the unexpected loads that can be encountered on the road?
Which company is offering this, does anyone know or is it secret squirrel?
Or when you buy specialist parts like this do they make it clear you are buying something with limited liability?
Not trying to slag it off, as David knows I've had cars modified in the past but was always circumspect with suspension and running gear. Fatigue can make a part fail quite rapidly or at least unexpectedly. As Steve points out is it suitable for the unexpected loads that can be encountered on the road?
Which company is offering this, does anyone know or is it secret squirrel?
paralla said:
correct, they also make a very good 918 seat tilt bracketas the 918 seats are a bit stupid upright esp with a helmet on.
while the folding buckets are great the 918 are to upright, who every passed that design was not thinking ! or did not try a GT track car with a helmet on !
Hello everyone, my name is John Gaydos of AutoQuest Motorsports that offers the Multi Link Rear Suspension Kit featured in this thread.
It certainly seems the cat is out of the bag, a bit before we are ready to make the official release on our website and forums if I must be honest haha. Regardless, as there seems to be some geniune interest in learning more about it, I'd like to open the floor for a Q&A on the kit to help educate you on what it is we have developed. For your reference, the R&D on this kit took place over a period of 18 months at multiple tracks in collaboration with Formula One/Le Mans/IMSA engineer Jay O'Connell. It has exceeded the 997 RSR rear suspension geometry goals we were aiming for, and the final production version has been stress tested in excess of 2000 miles on Sebring on a variety of different tire compounds. They have already been sold and installed on a half dozen GT4's, and a Clubsport as well, with nothing but exceptional feedback.
I'm looking forward to chatting with you guys.
Moderator edit: no advertising please,
It certainly seems the cat is out of the bag, a bit before we are ready to make the official release on our website and forums if I must be honest haha. Regardless, as there seems to be some geniune interest in learning more about it, I'd like to open the floor for a Q&A on the kit to help educate you on what it is we have developed. For your reference, the R&D on this kit took place over a period of 18 months at multiple tracks in collaboration with Formula One/Le Mans/IMSA engineer Jay O'Connell. It has exceeded the 997 RSR rear suspension geometry goals we were aiming for, and the final production version has been stress tested in excess of 2000 miles on Sebring on a variety of different tire compounds. They have already been sold and installed on a half dozen GT4's, and a Clubsport as well, with nothing but exceptional feedback.
I'm looking forward to chatting with you guys.
Moderator edit: no advertising please,
Edited by jeremyc on Friday 6th October 10:10
kilarney said:
John have you gone your own way from Fabspeed ?
Good catch there Kilarney lol, what's your name? Figured we likely worked with each other before then. I left on great terms with Fabspeed and am still an authorized distributor for their products. I just couldn't pass up the opportunity at AutoQuest, they are on a whole different playing field when it comes product development, resources, and experience with the Porsche platform.Edited by jeremyc on Friday 6th October 10:11
woollyjoe said:
not had problem with buckets, but did notice that my thighs barely touch the seat... I'm a short arse and drive like an old lady with my face on the steering wheel. The tilt option may actually help me - will look into it.
RE rear suspension - barring adjustment - how would i notice the benefit?
Our seat angle adjusters are nice change to the seating position. Much more supportive feel and line of sight is night and day better especially with a helmet/HANS on.RE rear suspension - barring adjustment - how would i notice the benefit?
Regarding the benefits of the Multi Link system...
Results
• More camber: By inverting the camber gain curvature, our Multi Link geometry achieves significantly more negative camber in bump and roll compared to the strut. This allows for 2.5 degrees more negative camber at full bump and 0.9 degrees more negative at 3 degrees of roll.
• Less roll understeer (only 1.2% as compared with 8.4% stock).
• Minimal toe out during rebound.
• Higher/consistent roll center height (46 mm higher than stock and no longer drops in roll).
• Anti-geometry similar to stock with slightly more anti-squat (120% instead of 108%) and slightly less anti-lift (54% instead of 58%).
Driver Feedback
• Much better high speed cornering confidence, due to the increased camber gain and roll center stability.
• Greater low speed agility due to the higher roll center.
• Greatly improved stability during hard braking due to less toe change in rebound.
• Average lap time improvement of 1 second per minute.
woollyjoe said:
Thanks, when is site going to be up and running and are you guys in UK?
Our website (autoquestmotorsports.com) is up and running with all the products we currently have publicly released. I'll admit the format is a bit out of date and doesn't have e-commerce yet, but it's functional at least : )We are in Ft. Myers, Florida but we visit the UK occasionally, as recently as last week haha.
John Gaydos said:
Our website (autoquestmotorsports.com) is up and running with all the products we currently have publicly released. I'll admit the format is a bit out of date and doesn't have e-commerce yet, but it's functional at least : )
We are in Ft. Myers, Florida but we visit the UK occasionally, as recently as last week haha.
Good stuff here - also note that you have a Final Drive Reduction option now.We are in Ft. Myers, Florida but we visit the UK occasionally, as recently as last week haha.
You should create a new thread! http://www.autoquestcars.com/custom-10
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