Interesting post...as it definitely confirms, HP doesnt prove anything.

Bill, I'd love to see that car in action. Btw...have you run against a RUF 996 550RT?


I heard someone in here with their stage IV recently smoked a StageIV GT! I wont reveal the cars/owners as this will surface on it's own (FYI...it wasnt shank's IVGT).

 

Doesn't surprise me in the least bit. Most of the 4GT dyno sheets I've seen show considerable less mid range than a lot of the K24 cars. I believe it's all in the tune. Also, while the Stage 4GT car might make a touch over 500WHP, from the dyno sheets I've seen, it only makes that for a few hundred RPMs during a spike. Pretty useless if you ask me.

 

I haven't run against a Ruf 996 550RT. I understand it's faster than the 993 TR.

 

Kevin the turbo guy thinks they are some type of K16 hybrid like the GT1 turbos. They have several mods on both the hot and cold side.

 

I certainly agree that Bill's 993 Ruf turbo was surprisingly quick. Just as he says, the cars were basically equal in 2nd through 4th rollons. I really was surprised and amazed at the Ruf tuning. I suspect that with more room the newer cars aerodynmics would play a roll but I would definitely say that Ruf downplays their power and that the cams they use provide a nice sweet spot in the ranges we ran. Bill's car is a very well set-up package.

 

Im wondering if that IVGT is actually tuned correctly? Sean (Fab 5 Member) has the RUF 996 RT550 which seems to be equivalent to the other fab 5 stageIVs. Maybe Tony and Ken got some serious Stage IVs?

Oh well....do let us know if you have a chance to run the RUF 550.

 

I have the IBE switch on my Stage 4GT and was running the 91octane program. I expected to have a slight advantage but did not.

 

That may be an important factor. I was running a 100/91 octane mix. We should try again when I'm just running 91 or we both have the mix. I do have a power loss near 5500 RPM with 91.

 

These are great cars and tuning them does not seem to be an exact science yet. Just have to keep tweeking and having fun!
The challenge is in developing the most balanced overall package for your use. I was favorably impressed with the Ruf car's overall balance/engineering and relialize that I'm not done optimizing my TT yet. I need something to keep my interest in the TT till the next car.

 

Bill this backs up what we experienced against a 993 with similar bhp to the turbo R (510bhp )

The R turbo was a bit quicker to 140mph, but nothing special, walking away not running, but above 145mph the aerodynamics of the 993 were really pulling it back and then the 996 shaped car would easily run away from the 993.

The turbo R package is a really amazing setup and i would love to see more pics of your turbo R

best wishes
adam

 

Hi Tyson. I remember that day!

At this time I can't make the Concorso. However, if that changes, I'll let you know!

 

Hi Adam. That sounds right. Unfortunately there's not too many places to go over 150 MPH. That's the highest speed we hit down the front straight at Willow Springs Raceway in California.

Here's a picture of my car before the Ruf conversion. After the conversion, the car's over an inch lower. Otherwise it looks the same. This is beside the Salton Sea in Southern California, 235 feet below sea level.


Ruf at the Salton Sea

 

Thank you for the pic bill, beautiful car, does being below sea level give any gains bhp wise?

all the best
adam

 

Actually yes. On a cool humid day at that location, the car feels like it's running on 100 octane when I'm using 91.

 

I dont mean to sound redundant or butt into the arguement here, but horsepower is not all that matters at all. Torque is very important in a car's acceleration as well, as well as power to weight ratio and gearing.

Take a E55 AMG for example, it can keep up with a stock 996TT in a 1/4 mile with 469 HP weighing well over 4500 lbs, while the 996 has 415 bhp and weighs around 3600 lbs. They are trading off over 1000lbs for about 55 hp. The only thing that makes sense here is that the E55 makes 100 more lb/ft of torque than the 996TT and that is what keeps the tank up with the VW.