very cool website and service.

 

So what did it tell you?

 

Thanks cool site,
here are the results
http://autoatlanta.com/life/vin/vin....ZZZ99Z6S763413
I got option IX51 and in description its says Powerkit 250 kW i think thats it
thanks again Taxi great site better then the ones i googled all of them told me invalid VIN


Ian_UK1 you were right cheers mate

 

Good to know you discovered the full story behind your car's spec. X-51 cars are quite rare and drive really well. They're also a great basis to tune from. Adding 200-cell catalysers to that engine and will get you near as makes no difference to 400BHP...

 

Cheers Ian do you have any brand suggestions? I was thinking about GMP Performance Intake Plenum they claim it gives you
HP Gains: 27
Torque Gains: 25

could that be true?

 

That won't work with the X51 as the throttle body is too large and the bolt pattern won't be correct for the larger plenum.

Dave

 

Actually Ian, Strtpwr has done the X51 intake, throttle body, plenum and CAI without the heads and the car runs great even without the X51 software with no codes.

Dave

 

thanks for the info Dave I really appreciated but would it give that kind of numbers on C2s without x51 kit?

Basel

 

There was one of the longest threads ever on here about plenums. A quick search will find it. It boiled down to one set of dyno tests showing gains that were perhaps more substantial than the plenum's design should really give and another set of tests that showed a small but repeatable performance loss. I personally found no discernable performance gain from a plenum on my 997S.1 - others have reported different results.

The best performance mod for your car w/X-51 would be 200-cell cats. The intake side is better in every department than stock already - airbox/filter area/ t-body size/runners/ gas-flowed intake ports. (The X-51 setup doesn't use a plenum as such - the air simply enters a large space between the runners). Your exhaust also already has the X-51 headers that are, near as makes no difference, as good as most tubular headers. The only thing that's still restrictive is the catalysers.

You'll need a pair of cats that use the same diameter pipework as the stock cats to match both the headers and PSE cans. AWE's cats, for example, use a larger bore inlet so don't match the outlet on the headers (though I guess you could use AWE's headers and cats - now THAT would be an interesting combo with the X-51 engine)! I'd also avoid so-called X-pipes that mix the gas streams from both banks of cylinders. There's much debate about whether they're effective or not. My opinion is even if they can be proven/made to work, they'd require significant changes to the engine mapping as mixing the exhaust streams is a fairly fundamental change from stock. Cargraphic do a suitable set of 'separate' cats, as do others.

Enjoy!

 

Congrats!! You have X51!

 

I second this! I have it on my car as a retrofit and it is a huge expense and, for the looks of it and what your can already has that is readily apparent, I would also place a large bet that you have it on your car!

 

thanx a lot for the information i appreciated a lot , also we are going to talk more about the cats, cuz i want to remove the stock one's and add the after market to increase the exhaust flow, but in your opinion if i changed them to the 200 cells cats would i need a tune? if so how can get it?

 

thanks a lot Suncoast

 

yep i checked VIN and its says i have it. Did you do any mod to your car?

 

If you just changed the cats on your car, you'd notice an improvement without an ECU tune. The stock ECUs can adapt to small increases in flow (and we're only talking about a 15-20 BHP increase on a 380 BHP engine, so in percentage terms, it's small).

An GOOD ECU remap will get a little more from the motor but it will do so by reducing the safety margins the engine has (in terms of adverse conditions / fuel quality etc). An ECU tune can only change timing and air-fuel ratios. Most tuners tend to use a little more timing as the stock values are quite conservative. This is only of benefit if you are using very good quality, high-octane gas - if not, the extra timing will be negated by the knock control systems. They also tend to lean the mixture a little for extra top-end power. The stock ECU maps run quite rich at the top (I was told this is to protect the cats from overheating during sustained, full throttle running).

Benefits to a remap? If you get a good one that is working properly with your hardware setup - better throttle reponse, smoother power delivery, a little more torque and maybe 10-12 BHP at the top.

Downsides? Any remap (with the possible exception of Softronic) isn't completely reversible (as a dealer will always be able to detect that it has been done). This has potential consequences regarding warranty and resale. Reliability - If the remap isn't done properly or removes any of the engine's protection systems, be prepared for some large bills! Wasting your money - A bad remap will deliver less power, worse fuel economy and worse running than stock. Always go with a known and reputable tuner who can supply a map that will work correctly with your mods.