Tom O'Kelly's Porsche 997 Carrera 2S 3.8 | Testimonial & Pictures | Stage 3

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Tom's Testimonial - Stage 3 Modifications  (list of modifications)

Tom O'Kelly's Porsche 911 997 Stage 3 Modifications

“Got some dry weather and a run out on my own with half a tank of fuel today, the saying small changes make a big difference.....”

“The car is now fab through my local tight twisty roads with Telegraph poles at the side. On the motorway I wouldn't want it any firmer or it will stop being a long distance cruiser but on the back roads its a revelation. I am sure the Drop links have made a difference too, more immediate response to steering inputs and less bounce on bumps, especially at the front.”

“As to the induction kit - it works ;-), my test corner where I leave a 30mph limit in 3rd and floor it, I am passing my marker point at approx 5+mph faster. The drop off on torque is narrower probably 2k to 2.5k revs now and it start to pull properly from about 2.8k revs as opposed to approx 3.1k previously. The throttle is much more responsive and it pulls more smoothly with less hesitation low revs and high gear and high revs, low gear. Its probably a less steep torque curve then”

Tom O'Kelly's Porsche 911 997 Stage 3 Modifications

“So far, so good the party piece is that the acceleration and torque from 3k revs has now got even madder, I would start to use the word brutal. So it feels like not only have we smoothed the torque curve out a little between 2 and 3k revs we've got more torque and power over 3k, so possibly a higher peak torque and peak power. The extra 5mph at my usual checkpoint included a slight hesitation while checking the road and checking the Speedo. ;-)”

“4th gear acceleration now feels just silly!!”

“The combination of handling changes and extra grunt has really upped the performance feel of the car it feels much nimbler and much more muscular.”

“Getting an induction kit made up properly in some nice carbon materials looks like the next step. ”

Tom O'Kelly's Porsche 911 997 Stage 3 Modifications

“I was very cynical about the whole induction thing but after the gains of a straight K&N kit, I became much more open minded. When the engineer made the suggestion, he explained that the shorter and wider the pipe the better and that's pretty much what they use on the cup cars. Looking at your K&N GT3 kit its just a bit wider and just a bit shorter but claims an extra 5hp. ”

“I am not expecting much, if any power gains from the changes it just seems to have made it more accessible and improved throttle response, the shove in the seat is more so that's suggesting more torque where as the expectation with the shorter pipe is possibly a bit less peak torque but with a smoother curve and slightly higher top end power. So that's interesting. ”

Tom O'Kelly's Porsche 911 997 Stage 3 Modifications

“Clearly I have had to factor in the fact the air temp is down a few degrees so the car will feel slightly gruntier anyway however Jacqui noticed the difference with a full tank, two of us and some luggage - she felt it was quicker (last time we were out was half a tank and no luggage), so it is clearly noticeable rather than requires thinking about. To me its about the same difference as putting on the BMC air filter made so ultimately only a few hp/Lbft but all through the range giving noticeably more usable performance.”

“I am wondering if the additional space in the engine bay is also a factor. Having taken the air box out, with the K&N in there it creates a lot of air space in the engine bay - I wonder if that's allowing the air flow through to be more efficient lowering the air temp in the engine bay, that itself would provide part of the explanation for the improved grunt on the road.”


Stage 3 Modifications made to Tom's car  (testimonial)


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