Superbike - 55bhp is very accurate for a 997. The Softronic Tune and the intake is the biggest difference, the others only improve efficiency. I urge you to try it out and prove your pessimism wrong!

I mentioned before, in our Cayman and 996 TPC Turbo Article seen here - http://www.vividracing.com/forums/project-not-ours/, you can spend $5-$6K on mods, or $96 on a TPC Turbo Kit which will give you a real 100HP gain. Check out the write ups, dynos, and videos.

Call me to discuss!

 

I've got about 6 months under my belt with the TPC turbo as well as Bilstein coilovers & swaybars on my '06 911 C4. It's worked for me. The car is scary fast and is still completely reliable. As for the best exhaust system for the TPC turbo, remember it comes with a new one. And that new exhaust has a deep bass sound at idle through about 2500 RPM, whereupon if you get on the gas pedal it changes sound and sounds like a race car. I wouldn't want it any louder than it is, which suits me well.

Whether it be the turbo or the coilovers, the cost WILL NOT BE recouped if I sell it anytime soon. And that's true for most/all mods. Those considering them should be plannning on holding on to their cars for a while. In that case the TPC turbo is a great value considering the 150 HP boost.

 

If you are going to go the TPC turbo route, all you need is a stock car. No tuning, no exhaust, no plenum, no headers, no intake. It comes with EVERYTHING!

 

Best mode for money and HP TPC.....

 

Simple answer which will shock and amaze your friends: change final drive ratio in your transmission from stock 3.44:1 to 4:00:1.

Want acceleration ? You've got it, and totally stealth.

California Motorsports can fabricate any ratio you want for about $3,500. Lead time is 10-12 weeks.

This said, one on one track time with a qualified instructor remains the best bang for the buck (after which, you should change out the final drive and add the supercharger)

 

GREAT advice on the final drive for a NA car....!
BUT...
I actually thought about changing the gear ratios(1-4th) when I had a supercharger ...I was going to go to a taller gears to give me a longer power!
With the added power of a Foced Induction system (120-150RWHP)......I couldn't imagine trying to pull the first-second-third shift and faster than I was (and I have a DME/level 1 over revs) to prove it!

Stacy

 

I agree it is an awesome mod, I have a friend that did this in his 996GT3, and it is very quick! He gave up top speed, but who uses 180-190 miles per hour on a road course?

 

I have a similar set up...more power yes, 55 HP not sure about that.

 

I had a good talk with a very informative individual today (Matt....GTgears here on 6 speed) and he figures that with the 4.00:1 final drive our top speed would go down to around 165-170 mph and like Ed posted..seriously.. where are you going to turn those MPH's on the road course or better yet on the street!?
Matt did mention THAT at 75 MPH our RPM's would be approx. 600 rpm higher than stock!

Now the question is....what does that final gear ratio do to acceleration times?

This sounds like a GREAT mod....especially IF you need a clutch...and while you are in there drop in a LSD!


Stacy

 

Hello,
As Stacy mentioned he gave me a heads up that this thread was active and talking about gearboxes. There's something that 997 owners should know when it comes to your gearboxes. Your gearbox is nothing like a GT3 or turbo gearbox. It's made by a different company (Aisin) and uses a different assembly technique. It's a press fit and doesn't lend itself very well to multiple rebuilds because of this. Depending on who you talk to about it, you can get one or two rebuilds out of it before the tolerances on the interference fit are loosened up enough that you've got to spend the big money on a new ring and pinion and mainshaft.

So, if you look at regearing your gearbox just be aware that you are making a commitment. When you wear out the replacement gears or ring and pinion it might become time to replace the gearbox in it's entirety. As such, I tend to discourage people from doing the ring and pinion or short gears mod until it's time to rebuild the box for the first time. It's hard to imagine several thousand dollars worth of parts as "while you're in there" parts but I think they are.

However, the addition of an LSD does NOT require messing around with the press fit parts and so present no jeapordy on using one of your limited number of rebuilds. And believe it or not, it will make you faster if you are running the car on the track. If you haven't heard about the epidemic failure rate on the factory GT3 LSDs, just look for a thread in the 997 GT3 forum titled "LSD Buster". It will tell you everything you could ever want to know about the poorly made factory LSD and what kind of improvements can be made to it with service.

Of course this doesn't help you guys since your cars won't accept the GT3 LSD. But the point of telling you about this is that thread contains testimonials of the difference GT3 owners experienced when they got a functioning LSD in their cars. We're talking about guys picking up 2 to 3 seconds per lap on a 2 minute track by going from no LSD to LSD. If you're a track day junkie with your 997, you can expect to see the same sort of gains if you install an LSD in your car. Both Stacy and Van run TBDs in their car, which is kind of a "half" LSD and I am sure they can tell you what kind of difference even that made for them. In short, if you are building a track toy, you want to add a TBD or LSD to the car. And especially if you put in some sort of FI like a turbo or supercharger you'll want something to help you put power to the ground. It's almost mandatory when you add another 50-150bhp to an already powerful sports car.

 

Anybody know if any companys sells the Gundo hacked Canns i just dont want to hack my stock Canns plus im assuming the welding job has to be pretty good too