SpeedBump

or buzzing noise? which would be the same thing as the vibration I guess.

NineMeister

We have certainly not experienced any issues with the flywheel, and the first batch of 5 units that we fitted have all been as smooth as silk. I would think that you would experience some gear chatter from the transaxle but there definitely is no harmonic vibration - I guess Porsche knew what they were doing when they made their flywheel, this is simply a close reproduction of their part (which is no longer available) so it must be right for the job.

As I explained to Raj, the flywheel is CNC machined from a solid steel billet and then heat treated, the starter and trigger rings are custom made to suit and sweated on, all of which costs a lot to do in small batch quantities. Hence why the price of the flywheel works out at £895 retail, I wish it could be cheaper but if it was we could not make it, ok?

NineMeister

When we first supercharged our Clubsport it had the standard kit with 360hp running through a stock engine and exhaust, complete with factory cat. The car ran like this for 12 months, and my business partner Marc used the car a lot for track days and drift school. At no time did this car overheat or show signs of having heat problems even on the hottest days on track. The stock kit runs at 6-7psi at peak power which nicely complements the poor top end VE of the stock engine. Given that we ended up increasing the boost on our own car and finding a comfortable 50hp extra and then thrashed it for another 12 months I think it is fair to say that the standard kit is over-engineered with its 4 core alloy rad/intercooler combination.

The stock kit consists of:
1. Supercharger & bracket (different pully used on 430/480hp conversions)
2. 4 core radiator/intercooler assembly
3. Alloy header tank
4. Alloy/silicone boost & intake pipework
5. Supercharger oil cooler, tank, filter and pipework
6. 4 x high impedence injectors
7. Recirculation valve
8. DME remap (uk dme only) - retains stock air flow meter

For racing I recommend that you fit the 8 rib pully/belt conversion from the 430 kit to reduce the likelyhood of belt slip.

Renalicious

480HP wow, can a stock gearbox handle that? I read that Audi had a problem with the first gear in their gearboxes in cars that were turbo charged. Too much torque or something. They redesigned and went with bigger (diameter) gears. Ours are based off of the smaller gear design I think.

Still, I bet it would be a real hoot to drive

NineMeister

A gearset will break when the transmitted torque exceeds the mechanical strength of the gears so I would almost certainly expect a high power turbo engine with its typical mid range torque peak to create enough shock loading to break the standard 968 box. In contrast, the torque response of even our most powerful supercharger is very progressive and smooth, the peak at 400lbft is less than that of an equivalent 500hp turbo engine, so as a result I doubt that anyone would have gear problems with a 9m supercharged 968.

SpeedBump

Love it Colin but I'd have to hit the lottery.

nick_968

As far as I know none of the high power turbo 968's have had any gearbox upgrades for strength purposes. I read somewhere a long time ago that they are good up to 600hp, but then as Colin says its torque that kills boxes not hp. I think they are pretty safe up to 500lb/ft torque but after that its going to be suck it and see. Fortunately most Porsche stuff is over engineered and we get to reap the benefits when upping the power.

Damian in NJ

I blew Raj's clutch before I had a chance to hurt the gearbox . . .

nick_968

lol Damian! Good job he is a bit handy with the tools then!!

Jason Judd

As far as I know none of the high power turbo 968's have had any gearbox upgrades for strength purposes...
____________________

When we did my turbo conversion, we switched out the Torsen LSD for the Porsche Motorsport's version because of this very concern...my car is about 400 RWHP and 400 RWTQ at this point as measured by Mustang.

We also bought PowerHaus II shorter gears for 3rd~6th gears. I really don't know if they are stronger than stock, though.

I think that Colin's Supercharger sounds great and would love to do a comparison between our two approaches.

I just finished 4 days at Watkins Glen, and my car ran flawlessly...oil temp ranged from 180~210...same for water.

Jason

RajDatta

The CV shafts and half shafts on my turbo are much stronger and bigger along with the LSD being a 75% locking factory motorsports LSD.
Colin, I am giving your flywheel some serious thought. Since its the only one that can actually be called a Motorsports replica. What you see in the pictures is actually what you get. All the other ones I have seen are fidanza or fidanza knockoffs.
Regards.
Raj

BruceWard

Colin,

I love the power increases but would more excited about the opportunity to install a supercharger and keep the AC

H2

Doesn't it take specialized equipment to get the gas/air ratio reconfigured rignt for supercharging and this is not something that can be done at home? Does it take multiple Dyno tests to fine tune?

Harvey

RajDatta

Harvey, our cars come with multiple maps. People that are familiar with our DME can fine tune them though the entire rev range. To do this, it requires multiple runs and loads to get all different parts of the map right.
Definitely doable.
Raj

brakinglate

What kind of money is this conversion ?

Cheers