996 Turbo / GT2Turbo discussion on previous model 2000-2004 Porsche 911 Twin Turbo and 911 GT2. Sponsored By Vivid Racing
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I get 0.6 on super unleaded 97-99 octane. I once had to use 95 octane as was all i could get and it boosted higher (0.7-0.8)
Does the computer compensate for lower fuel spec, and to get the same HP automatically increase the boost? Read this somewhere but cant recall where.
cheers
you mean 95 first and then went to 98. 95 is like our 90 octane. that is probably why the car ran low boost. 98 is good stuff however. 93 octane equivalent today.
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No, it runs lower boost on better fuel. Car is stock apart from exhaust.
Is there any truth that the computer adjusts boost to ensure the factory performance in whatever conditions (ambient temp, fuel octane etc)?
cheers
that makes no sense whatsoever. on worse fuel the ecu will pull timing causing boost to drop to save the engine. If you run better fuel you will have the max boost that the ecu is set at. I don't know why you would be running higher boost on lower octane, that is crazy. maybe the tuners here could explain this
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hmm, I was under the impression that to save the engine the ecu ill both pull timing and boost.
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hmm, I was under the impression that to save the engine the ecu ill both pull timing and boost.
That may be so but it's not what you said. The ECU may pull timing in response to knock detection and it may also lower boost but simply lowering timing won't lower boost.
Lowering timing lowers cylinder pressure since the expanding gas ends up chasing the piston down the cylinder, done too much and EGT will climb as still burning mixture goes out the exhaust valve and into the header. Likewise lower boost puts less air into the cylinder in the first place. However the mechanisms aren't linked to one another - one doesn't cause the other.
That may be so but it's not what you said. The ECU may pull timing in response to knock detection and it may also lower boost but simply lowering timing won't lower boost.
Lowering timing lowers cylinder pressure since the expanding gas ends up chasing the piston down the cylinder, done too much and EGT will climb as still burning mixture goes out the exhaust valve and into the header. Likewise lower boost puts less air into the cylinder in the first place. However the mechanisms aren't linked to one another - one doesn't cause the other.
you explained it very well. makes perfect sense, but also explains that there is no possible way he could be going higher boost with lower octane fuel.
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UPDATE
I changed my DVs with new Bosch ones (I only found these now)
Checked visually everything, but didnt see anything wrong.
Where do I stick a pressure/vacuum tester on a stock car ??? (be careful what you say pls ....)
You just looking for boost leaks? there's a DIY Leak Tester thread recently posted to by myself and others in the last few weeks that will help you out with that. Pretty much you just pull airbox\MAF, clamp it in, pressurize things, listen for leaks. You can also unhook turbo piping at turbos, block one, pressurize the other - no pressure in intake pipes doing this.
Just for the record, I replaced my DVs with baileys from AWE and it helped my boost leak. I have not pressure tested yet but will in a week or so when I do plugs.
__________________ 96 Arena Red 993
82 SC sold
06 Cayman S sold
02 996tt X50 sold
Remember 1.0bar=14.7psi....therefore you do not want any excess of 14.7psi (on a stock car) to your turbos...unless you upgrade in other areas such as waste gates.
On piston aircraft they run "Turbo Normalized". This meaning the turbo never exceeds 14.7psi..dispite the altitude from 500'-15k plus.
I had a problem with my boost. I found it in the vacuum system an located a bad pop off valve. It would reduce the boost to .6-.7. Stock boost should not exceed .85 bar.
Remember 1.0bar=14.7psi....therefore you do not want any excess of 14.7psi (on a stock car) to your turbos...unless you upgrade in other areas such as waste gates.
On piston aircraft they run "Turbo Normalized". This meaning the turbo never exceeds 14.7psi..dispite the altitude from 500'-15k plus.
I had a problem with my boost. I found it in the vacuum system an located a bad pop off valve. It would reduce the boost to .6-.7. Stock boost should not exceed .85 bar.
My car definitely has a software upgrade. I wish I knew what software it has is but it boosts to a solid 1 bar. The pressure gets to 1 bar and does not fluctuate. Does anyone know if there is a way to find out what software I have? I used kwp2000 on BMWs in the past but it doesn't work on a Porsche. I wish there was a way to look at the flash because turners usually put a signature in it.
This problem drives me nuts...
I have a 05 MY 996 TT S stock apart from a RUF rear silencer
the car has 8 k miles (13000 klms) and yes it is like new.
I bought it a few days ago, I am the second owner, and I have owned and driven many Turbos before as well as 996TT and 997 TT
The problem with my car is that it does not exceed 0,6 bar (Car is Turbo S hence X50) and should reach as you all know 0.9 to 1.0 bar boost
I have changed the following
DVs New original Bosche
MAF New
MAP
I know its history from day one. It has never had any damage any conversion or ANY issues.
All hoses look new and in place, Intercoolers are like new as well as wastegates and Turbos
I have twice read P0172, and P0175 after the check engine light came on.
I am going to change the fuel filter today, as it is the standard one, but I guess it will be ok since the car has VERY low miles.
Any ideas as to what else could be wrong on such a fairly new car ?
Linear Mode
