Originally Posted by cayenne_ksa

I thought about create new thread to have better clarity and better understanding on how the change in weather can effect our TT's. I have gone through different performance claims from factory, magazine and 6speed memebers. Some shows significantly faster or slower results while sharing same engine components, whether modded or stock.

I have gone out and tested bone stock 2009 997TT turbo CAB with Vbox. Car was filled with pumb gas on both tests. It's supposed to be 95Oct but I have been told it's actually 92-93.

First thing I noticed was the cluster showing faster speed than the Vbox. For example, when the car was showing 62mph Vbox shows somewhere around 60MPH.

The car was tested twice:

FIRST TEST:

was a month ago. Ambient temp was 40C (104F) dry weather, 1/2 tank, and 1 passenger.

First run:
0-60: 4.4
60-130: 12.18
100-200: 10.27 sec in 455.77m
¼ mile: 12.63@116.76

second run:
0-60: 4.43
60-130: 12.9
100-200
¼ mile:12.68@113.69

Third run:
0-60: 5.58 s
60-130: 12.84
100-200:
¼ mile: 13.87@115.61

some other result was captured by the VBox (runs above are included ):

0-60:
4.4 , 4.44, 4.29, 5.58, 5.5
60-130:
12.18, 12.9, 12.84, 12.38,
¼ mile:
12.63@116.76
12.68@113.69
12.55@116.48
13.87@115.61

Second test


Ambient temp was 38C(100.4 F) super humid ( I would guess over 60%), Full tank, 2 passengers

First run:
0-60:4.69 sec
60-130:12.78 sec
100-200:10.76sec
¼ mile: 12.94@115.25
second run:
0-60: 4.45
60-130: not achieved
100-200: 10.11
¼ mile:12.62@117.08


For comparisons sake, other 6speed car shotcaller





now I would like to hear some thoughts from people with more experience than me and any feedback is greatly appreciated. Also I have dramatic cable and software if more data is needed, All Vbox are available for verification.

If anyone has links with scientific explanation on how temp, humid can effect engine. please share it with us. I would like to have some homewroks

Originally Posted by venkatreddytx

Do you have datalogs that show your timing, boost. afr etc.

You timing may be retarded due to hight temps.
if not tuned properly, you car may be under/over boosting causing high IAT's.

Originally Posted by 08Turbotip

How are you launching your car? Sounds to me like you are launching incorrectly...

I just Vboxed mine, and only did 2 runs... Bone stock 08TT TIP...

0-60 in 3.5
0-100 in 8.6
1/4 11.8@117.8

2nd run

0-60 in 3.5
0-100 in 8.7

1/4 11.9@117.2

Originally Posted by cayenne_ksa

I think I do have datalogs of of the car but not sure. I will check my files.



little brake with some gas then let go. What is interesting that we trapped almost same speed 117.08 VS ( 117.2 & 117.8), so it could be the launching method. any chance you have 100 to 200kmh or 60mph to 130mph.

Originally Posted by 08Turbotip

Only 60-130 I got was during the 0-130 run I did ( 0-130=15sec flat) and the 60-130 was 11.5.. It would def go faster if I did a rolling 60-130...

That being said... to launch you have to turn PSM off, turn on SPORT mode.... Then you have to click the transmission down a gear to start in 1st gear, otherwise you are launching in 2nd gear.. This is an important step that everyone forgets.. Then you put your foot on the brake, and your floor the gas to the floor.. Watch your boost gauge as it builds to aprox .8 bar....and release the brake, gas to the floor.

Originally Posted by cayenne_ksa

most of my 60-130 runs was from zero. I thought the push before entering the 60-130 range would help to achieve better result but it could be due to the multiple gear shifting.

as far as launching, I fallowed same method except the full brake full gas method as I didn't want to harm the gearbox.

Originally Posted by 08Turbotip

Are you making sure to manually put the car in 1st gear? And you definitley need to get the boost up off the line, otherwise the car is very slow.

Originally Posted by 08Turbotip

also, the fact that your are trying to get Vbox runs with 1 or 2 passangers isnt helping you any..

Originally Posted by cayenne_ksa

fixed it I meant by 2 passenger 2 people in cabin. Thank you so much for your contribution. BTW the car got some protomotive treatment and been tested. I will post the result later.

Originally Posted by cayenne_ksa

most of my 60-130 runs was from zero. I thought the push before entering the 60-130 range would help to achieve better result but it could be due to the multiple gear shifting.

as far as launching, I fallowed same method except the full brake full gas method as I didn't want to harm the gearbox.