996 Turbo Boost
Discussion
I recently bought a 996 Turbo.
I did a few runs on a dual carriageway today. Cruising along at 40 then I bury the accelerator. I am getting a constant 0.9 Bar for 5-6 seconds before I run out of road.
The car is the 420BHP (not X50).
What is standard boost for an modified turbo?
The cars runs on V-Power and as far as I know is standard?
Would this boost reading suggest it has been tweaked?
I did a few runs on a dual carriageway today. Cruising along at 40 then I bury the accelerator. I am getting a constant 0.9 Bar for 5-6 seconds before I run out of road.
The car is the 420BHP (not X50).
What is standard boost for an modified turbo?
The cars runs on V-Power and as far as I know is standard?
Would this boost reading suggest it has been tweaked?
If I recall correctly x50 ( can't remember exactly as mine was chipped soon after I got it) is around 0.8-0.9. For a non x50 car I would suggest "chipped" 
but I am led to believe various faults including sticky wastegate can also leave you with this amount of boost, and of course it varies day by day with atmospheric conditions, was it particularly cold ? (Iask, as I am 1500km further South)
but I am led to believe various faults including sticky wastegate can also leave you with this amount of boost, and of course it varies day by day with atmospheric conditions, was it particularly cold ? (Iask, as I am 1500km further South)the other me said:
If I recall correctly x50 ( can't remember exactly as mine was chipped soon after I got it) is around 0.8-0.9. For a non x50 car I would suggest "chipped" but I am led to believe various faults including sticky wastegate can also leave you with this amount of boost, and of course it varies day by day with atmospheric conditions, was it particularly cold ? (Iask, as I am 1500km further South)
From what I understand, standard is 0.7 with possibility of 0.8 for brief periods. but I am led to believe various faults including sticky wastegate can also leave you with this amount of boost, and of course it varies day by day with atmospheric conditions, was it particularly cold ? (Iask, as I am 1500km further South)On another thread it was said that .6 was full boost with .7 on occasion, so I'm not entirely sure.
I think mine peaks at .7 on standard unleaded but I've not really had the space to test that yet as other cars get in the way.
kkerr3 said:
I recently bought a 996 Turbo.
I did a few runs on a dual carriageway today. Cruising along at 40 then I bury the accelerator. I am getting a constant 0.9 Bar for 5-6 seconds before I run out of road.
The car is the 420BHP (not X50).
What is standard boost for an modified turbo?
The cars runs on V-Power and as far as I know is standard?
Would this boost reading suggest it has been tweaked?
If by "an modified turbo" you mean an unmodified Turbo, and non-S model, the standard boost can vary. Nominal boost is 0.7 bar.I did a few runs on a dual carriageway today. Cruising along at 40 then I bury the accelerator. I am getting a constant 0.9 Bar for 5-6 seconds before I run out of road.
The car is the 420BHP (not X50).
What is standard boost for an modified turbo?
The cars runs on V-Power and as far as I know is standard?
Would this boost reading suggest it has been tweaked?
The way it was explained to me is the Ecu attempts to meet the torque demanded by the driver (signaled by the e-Gas pedal).
If the Ecu can do this with 0.6 bar of boost that's all the boost you see. If it takes 0.7 bar of boost you'll see 0.7 bar of boost.
However, in some situations (more on this below) boost can rise and not due to an anomalous spike to 0.8 bar even 0.9 bar.
Where I live and drive the most boost I see with my stock 03 Turbo (not an S) is 0.7 bar.
However, I have been in the mountains of various western USA states driving at much higher elevations than where I live and spend most of my time driving.
A few examples are at around 7700 feet (I-40 at the continental divide just outside of Flagstaff AZ) and at over 8000 feet (I-80 at several places in Wyoming) and when I subjected the car to under hard acceleration (pedal to the metal hard acceleration!) I have managed to see 0.8 bar and even 0.9 bar boost with my stock 03 Turbo.
Some drivers have reported seeing the same levels of boost at lower elevations (in the 4K feet range).
The times I've have observed 0.8 and 0.9 bar boost the reading remained present long enough to convince me it was not a spike.
I do not know if the Ecu in the S model also allows for a boost level over "nominal".
0.7/0.8 is fairly normal for a standard setup.
Anything more could be down to very nice cold air or a duff diverter valve, boost leak, sticky actuator etc.
I would suspect, as happened to mine, something faulty would show in how it boosts, any hesitation in how it accelerates would be a clue that there's a fault with something. Mine would spike at 1.3bar when one of the DV's was knackered.
Anything more could be down to very nice cold air or a duff diverter valve, boost leak, sticky actuator etc.
I would suspect, as happened to mine, something faulty would show in how it boosts, any hesitation in how it accelerates would be a clue that there's a fault with something. Mine would spike at 1.3bar when one of the DV's was knackered.
I had a 2001 tt with a high quality Manthey remap. IIRC it hit 1.1 to 1.2 bar at max. Unbelievable acceleration. Torque was off the scale. And oddly, the mpg was around 26 over the long term (and i NEVER drove it any way other than "enthusiastically"), which is better than stock i think. Amazing car and 100% reliable - should never have sold it!
nick996tt said:
I had a 2001 tt with a high quality Manthey remap. IIRC it hit 1.1 to 1.2 bar at max. Unbelievable acceleration. Torque was off the scale. And oddly, the mpg was around 26 over the long term (and i NEVER drove it any way other than "enthusiastically"), which is better than stock i think. Amazing car and 100% reliable - should never have sold it!
I've got a 2003 one, same numbers as you got. Car is epic and I love every minute. Got Alcons and 6 pots on the front though, with that power it needs to stop too. 
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