I already have a 3" exhaust, which I love. But the drone is pretty bad for 2.3-2.8k RPM, Probably because of the X pipe design.

I have DV, aswell.

I will probably go with a promotive tune aswell. Through 911 tuning. The package they offer has 3 re-tunes with it, so thats pretty nice.

 

See thats what I though too. But .8 sorta makes sense.. Assuming the turbo runs at .6 bar and the gt2 at .8 .. I would expect .2 bar to make that 40 HP split between the two.

 

NORMAL X50/GT2 boost level is 0.8-0.9 with 1.0 bar spike in the summer and 0.7-0.8 with 0.9 spike in winter.
This is because the MAF reads the intake air density so it adapts the boost (a little high in hot weather / a little low in cold weather ) to mantein the same power in summer and winter .
The story that the boost is high when cold temps is NOT true with stock car (ECU/ and WASTEGATE regulation)...rather what happens is the exact contrary.
When car is remap, boost controller or 1.0 bar wastegate actuator or also stock actuators toghtened then is another story.

 

[QUOTE=cosworth;3687942]NORMAL X50/GT2 boost level is 0.8-0.9 with 1.0 bar spike in the summer and 0.7-0.8 with 0.9 spike in winter.
This is because the MAF reads the intake air density so it adapts the boost (a little high in hot weather / a little low in cold weather ) to mantein the same power in summer and winter .
The story that the boost is high when cold temps is NOT true with stock car (ECU/ and WASTEGATE regulation)...rather what happens is the exact contrary.
When car is remap, boost controller or 1.0 bar wastegate actuator or also stock actuators toghtened then is another story.[/QUOT]

Sorry to say but I think you have it wrong,,you will always see higher spikes in the cold weather then the warmer weather...
Without geting into basic 101,its just that way..
Just sharing info,its all good..

 

996tt boost line and gt2 boost line in attachment....

 

[quote=johnspeed;3687960]Right ..BUT without electronic sensor ECU control...if you have a Turbine that pump air at the same speed in summer and in winter then YES you will see higher BOOST in winter when the air is cold because cold air is more dense that hot air..this is a physical science rule.
BUT starting from intake air temperature ,the MOTRONIC ECU calculate the amount of air the engine need to produce a certain power and torque.
This Power/torque "goal" of we say 462 BHP on stock GT2 , remain the same in SUMMER and WINTER , so the ECU works for the ENGINE produce much the same 462 BHP at 0 (zero) celsius degree in January and at 40 celsius degree in AUGUST.
IS ALL around the air density that is much dense when cold and less dense when hot , so to produce the same engine combustion , more air is needed when hot and less air is needed when cold.
So if at 20 celsius degree to produce 462 BHP the engine need we say 100 parts of AIR and the turbine must pump at 0.8 BAR to reach this 100 parts of AIR , when 40 degree it needs 120 parts of AIR and turbine must pump at 0.9 BAR to reach this 120 parts ......otherwise at 0 degree it needs 80 parts of AIR and the turbine must pump only 0.7 BAR.
The calculation of how much air is needed in the different weathers is do from the ECU by the MAF readings (MAF reads temperature and density of the intake air) , so having this reading , the ECU from N75 valve regulate the wastegate actuators work to open and close the wastegate valve.
So when hot the ECU by N75 and actuators order to wastegate stay CLOSE much time because the turbine must run fast to produce 0.9 Bar of boost , otherwise when is cold the ECU order to wastegate stay OPEN much time because the turbine must run less fast since it must to produce only 0.7 Bar of boost.
SURE ...This is only what there is in my knowledge

 

i see 1.3 spikes and always look forward to the colder weather that'll make that happen i'm not sure what y'all are talkin' about anyway, since my mafs never work right "for long" anyway. hot/cold, new/old. doesn't matter weak link on any tuned tt.

 

are those stock k16 vs k24's? or an x50 ( k24 ) vs a gt2 ( k24 )? the latter of which is "essentially" the same map. no?

 

you "sure" about that? i'm with johnspeed on this one. looks back asswards to me though i'm with ya on the "normal" boost numbers for stock k24's. i ALWAYS get higher spikes in cooler weather. in fact, i have a 1.2 tune and only really see that in cool(er) weather. the 1.3 spikes are as rare as owl sightings up here and only happen in cool/foggy weather or similar conditions ( eg "cold" ).

 

I'm talking about what happen in STOCK configuration , TUNED one is another story

 

gotcha.

 

When my car (X50) was completly STOCK i remember boost was .9 much the time with 1.0 spikes at 25 - 30 celsius degrees.
But it read only .8 with very very rare .9 spikes , and in 2nd gear sometimes i've also read .7 when temps was 0 - 5 celsius degrees.
I've never seen .7 in 2nd gear when temps was 20 - 30 celsius degrees , always read .8 - .9.
Now that my car is tuned 1.1 Bar all the time , no matter what weather...
So i was spoken about STOCK cars.

 

Also i live in Milan (Italy) where temps goes from -10 celsius in January from +40 in July/August ...
Sure in LA You have NOT this problems

 

we may have a "language" barrier, as i'm not understanding that very well. but it's cool also, just because you saw one particular boost level one time, and another level a different time, ( or times ) is not really a good average sample.. i don't think? i mean, all things were ( presumably ) NOT equal.

so..does your water flow counterclockwise down your drains? it's possible that this could be a "different side of the world" phenomenon

i kid

 

The higher barrier is my english that is very very bad i know