Does anyone know what the part numbers are for the GT-3 suspension and if it is direct swap on to an older 996 (1999). I am looking at a car (NSF, aero, sport seats, SD's) that is speced as close to a Mk1 GT-3 as was advailable in the US and thought this could be a possible upgrade path.
thanks

 

It's possible to retrofit but you'll need a lot of parts what will make it very expensive.

Unless you want to keep the car close to the real deal, I suggest to use a good coilover set with the GT3 adjustable swaybars.

 

That is the other route i was thinking of (GT-3 swaybars and Moton dampers) which would probably be cheaper than the stock porsche parts.
just a hunch

 

I had JRZ single-adjustable dampers with faulkner 450/650 lb springs and adjustable GT3 swaybars on my old car. Better setup and a little cheaper than the stock porsche parts at that time. I was tempted to go with the Mk1 GT3 suspension when I did that just so I could stick with Porsche parts but I'm glad I went the way I did.

 

Hi Bob,

I have recently changed the suspension on my Mk1 GT3 from standard to full JRZ adjustable. If you are looking to track the car at all, this is the route i would recommend as you will have a greater degree of adjustment available over original GT3 units. A word of warning though, JRZ make a damper unit which is a direct replacement for GT3 units, and i'm not sure this would be a good idea on a primarily road use 996. One change is the JRZ GT3 units have a lot less droop, so on roughish roads, you get a lot of suspension crash, which can be very unerving. IMHO, i would not recommend getting anything other than one or two way adjustable units, as the art of setting up becomes very complicated, to the point where you really need suspension telemetry to gauge its operation. Give JRZ or Moton a call and discuss what you really are looking to achieve.

Best Regards,

Steve B

 

If i go this route it will be Moton's -
I am also considering a 964 C2 as a build car (and parts on the hoof for my cup car so to say) since i have soooo much stuff for the 964.
Cheap & disposable (if the worst happens again) too....

 

Rob,

I had a 1999 C2 w/ aero kit that I spent a lot of money trying to turn into a GT3. I ended up with a mix of GT3 and aftermarket parts which turned out to be a sweet handling (but rough riding) combination.

From the GT3 parts bin I used the front uprights (which also have a larger, more HD bearing) and front control arms with adjustable camber and caster. This allowed me to upgrade the brakes to GT3 calipers and rotors. And I was able to easily get 3-4 degrees of negative camber for the Hoosier DOT R tires I ran. I also used the GT3 adjustable sway bars with drop links from TRG.

For shocks I used ProTrac double adjustables (similar to JRZ or Moton) and monoballs. For springs I used Hypercoil 7" 650 lbs.

In the rear, I ran a similar set up with GT3 control arms and cross member, GT3 brakes, a GT3 sway bar, and ProTrac double adjustables with 800 lbs, 7" Hypercoil springs.

I ran Hoosier 245/35/18 on Fiske FM-10s 9x18 up front and 305/30/18 on 11x18 wheels in back. The car was lowered about an 1.5" in front and ran with about 15mm of rake front to rear.

This set up worked quite well for me but probably cost $15K all in, if I ever sat down and added up all the bills.

Karl

 

Steve B,

Good points, but with Manthey Racing doing your work, who needs to worry about suspension setup?

Tell us more about your engine conversion in another thread... I hear they have a 395 hp 3.9L motor for GT3.

 

Hi Hamann 7,

i think the Manthey 3.9 engine is rated at close to 500bhp, because i am getting 395 from my MK1 3.6 with the Manthey mods. With the MK1 being available since 1999, there is quite a large selection of tuning parts available now, and as most of you guy's know, the majority of them are crap.
Since i have modded my car, the character has changed beyond all recognition. The sound from the Manthey/Europipe exhaust system is absolutely incredible. She sounds pretty close to a full blown supercup car, with a deep rumbly growl below 5k, turning into a banshee scream above 6k. Dangerously addictive!!
The suspension has made the greatest change though. MK1 Clubsports were never the softest of rides, but she is now VERY track focused. With 2.5 degrees of camber all round, and a change to the toe settings, she is quite nervous on the country lanes around my home, diving and darting from camber to camber, never really settling. Definately not a car for cruising in!!
But on the track, with the suspension units wound up firmer, MPSC's on,she is quite phenomenal. I hope to be doing another track day in the UK soon, followed by a trip to Spa. I will be taking some video of these, so if anyone knows how i can post this, please let me know.

All the Best,

Steve B

 

Yes, that was a typo. I meant to say 495 hp!!!

I have emailed back and forth with Manthey and I am in love with their work.

Are the Manthey-Europipe exhausts different from the ones you can get from EP directly? My biggest complaint about the EP exhaust is that it doesn't save you any weight from the stock system.

On my former 996TT, I had a race car fabricator adapt an Indy car turbo exhuast to the flanges of my Garrett ball bearing turbos. The whole system weighed only 16 lbs. but it was LOUD.

I am trying to find a new exhaust for my GT2, so I thought about going EP, but if the Manthey version is different, then of course Manthey's is probably better.

Or I can adapt another Indy car muffler.

 

Hi Hamann7,

The Manthey pipes are made by Europipe, but only available through Manthey as they carried out all the development work. I think its very difficult so make any major weight savings with any kind of normally aspirated 996 exhaust, except remove the muffler boxes totally, which is a bit nasty IMHO. A good pipe should be looked at in context to the modifications it enhances. The Mantheyy pipe is of very little value on it's own, but combine it with a new ECU and filter and you have the makings of a decent upgrade. I dont think it is as easy to achieve the massive gains possible on turbo cars with the GT3. It is already at 100bhp/litre and you start to enter the realm of diminishing returns. The Manthey kit is about as far as i will go, but even this is not perfect. Ojn the dyno, you can see a loss of torque up to 4k revs, after which, the modified engine starts to produce significantly better numbers, running up to about 395 at 7500rpm. As the saying goes, nothing for nothing!!
As i said, i am not too familiar with the turbo side of things, but i can thoroughly recommend Manthey's products. Have a look at the pics i've included.

Best Regards,

Steve B

 

Another

 

and another!!

 

Hi Bass GT3,

Read your comments on your Manthey Racing exhaust set-up with great interest. Looks really tempting!

I am interested in the same set-up but hope you don't mind me asking, what price they were asking for?

Sent you PM.

Regards,

R

 

Hi Ray,

the complete kit, supplied and fitted including the dreaded VAT came in at around £7000. Hold on for a bit though, because my car is being tested by GT Purely Porsche next monday, for an in depth article on Manthey products. Once the test is out, you will have some solid info on which to base your opinion. Personally, i love it, but beauty is in the eye of the beholder!! If you want your car to sound like a full blown cup car, rev like a maniac and pull like a train, i think it does the job.

best regards,

Steve B