What do you mean?

 

Means he's not interested in the discussion anymore so he unsubscribed from notification of new post.

 

I believe that here is a place that we can write our opinions.
I wanna say that with those modifications on his car is not so easy to increase the 4s power in order to pass the gt3 in a straight line.
Mine when it has NA it was 380horsepower at the crack.its not easy to increase so much power(30hp) with those modes.
Believe me that I know how difficult is to increase hp in a NA car.
Also I know how fast is a gt3.
That's why I wrote this threat and I want to know real opinions,no what we believe.
And I believe that my car is faster than a 997.1 TT with almost the same power and weight but its not....

 

I was trying to limit the notifications to my email, still interested in the discussion

 

That's good for all of us....
I believe that your car is very good,fast and full of modifications but if you drive the gt3 you will afraid with the driving feeling.
Even I, with C2S supercharged and with 405whp I'm afraid gt3s power.
If I'm wrong please tell why...

 

My Car put out around 420 HP at the wheels or around 500 HP at the crank. It was very fast.
Fast can be somewhat subjective though and very dependent on who is doing the shifting.
Also other variables to consider. Outside air temp, density altitude and of course supercharger and inter-cooler heat soaking.

Walt

 

Correct.
Some mechanics tell me to use methanol and others not because its only for drag race.
What's your opinion?

 

sub'd...i'd like to know also...

 

Not just my opinion. There is a tremendous amount of information on the subject. You can start here: http://www.alcoholinjectionsystems.c...icle_info.html

Alcohol injection/ water injection in and of itself does not create extra HP. What is does is raise the specific octane as well as cool the air mixture to allow boost to be increased and or timing to not be retarded. (IE-More HP)
It helps to cool cylinder head temps also.

Boosting by design is compressing more air into the cylinder. The air then gets hotter by the compressing effect. Inter-cooling is one way to significantly cool the air. (Air-Air or Water-Air) Routing the air through an expansion chamber is another. As air expands, it cools. Alcohol injection or water injection is a third. The evaporation effect cools and absorbs heat. Alcohol is more efficient than water in doing this.

When you add a supercharger to an already high compression normally aspirated engine you are adding hot air created by the compression of the supercharger and then sending it to a high compression head to further compress and make it even hotter. At some point the possibility for detonation or early ignition can occur. That is BAD! When the engine senses this it will retard of pull timing. (HP loss) If it can not do so fast enough or retard enough, detonation can occur.

Cooler air mixture temps is the answer.

Walt

 

Thanks Walt

 

I'm new to the site and have a 2007 C4s with 30,000 miles. This is my 3rd Porsche and I am thinking about adding a Turbo. Any suggestions or experience with this mod?

 

I think if you want to add a turbo the better that you have to do is to find something safe for your engine,if you want to continue with your 2007 C4s....

 

Not long after I bought my 997.1 C4 (not S), I just wasn't impressed with the straight line performance. The handling seemed fine, but the acceleration wasn't enough. So... around 2009, I dropped the car off at TPC Racing and had the turbo added. After that point it was fast enough but then I realized the handling couldn't keep up, so I added TPC swaybars and toelinks and new Damptronics. It was lowered in the process as well. It's very satisfying now but after recent back surgery, I am giving some thought to raising it an inch as it's hard to get in and out of! The car has been completely reliable since the mods. No regrets.