Sportec finds hidden power?
01-23-2006, 08:00 PM
#1
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Sportec finds hidden power?
This is a transcript from Rennteam:
"Car was tuned at sportec at stage 2 (almost), no internal improvements. It has carbon airbox, improved turbos (base on stock ones with reworked intake, output etc), new intake tubing and stock exhaust with racing cats. The biggest gain though came from the fact that the engine was opened up by sportec because of a typical problem with 996tts (loose intemediate shaft screw) and then put back together. In that process they had the chance to correct a lot of the mistakes that the factory has made in this engine that restrict power. The gain was 30-40hp just by opening up, cleaning the engine, correcting those mistakes and putting back together. Two of the most important mistakes were regarding the intake cam (off by almost 1 degree on most 996tt from factory) as well as some of the turbo tubing that have wide diameter on the sides but are narrow in the middle section! Apparently porsche wanted to use the same part for the tiptronic where there is restriction of space..! The last 2 "improvements" had as a result the engine to produce more and more power until 7,000rpm+ instead of up to 6,000rpm of the stock engine. So all of the above yield 540hp and 850nm of torque."
Has anyone ever heard of these issues before?
"Car was tuned at sportec at stage 2 (almost), no internal improvements. It has carbon airbox, improved turbos (base on stock ones with reworked intake, output etc), new intake tubing and stock exhaust with racing cats. The biggest gain though came from the fact that the engine was opened up by sportec because of a typical problem with 996tts (loose intemediate shaft screw) and then put back together. In that process they had the chance to correct a lot of the mistakes that the factory has made in this engine that restrict power. The gain was 30-40hp just by opening up, cleaning the engine, correcting those mistakes and putting back together. Two of the most important mistakes were regarding the intake cam (off by almost 1 degree on most 996tt from factory) as well as some of the turbo tubing that have wide diameter on the sides but are narrow in the middle section! Apparently porsche wanted to use the same part for the tiptronic where there is restriction of space..! The last 2 "improvements" had as a result the engine to produce more and more power until 7,000rpm+ instead of up to 6,000rpm of the stock engine. So all of the above yield 540hp and 850nm of torque."
Has anyone ever heard of these issues before?
01-23-2006, 11:15 PM
#4
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Originally Posted by ebaker
Cam timing being off 1° is not an issue.
If we were talking about a 1mm that would be a ton, but based on the way the cams are timed this would be near impossible. The plates can only go in at one angle and the crank has to be TDC.
The issue could be that the crank was not at TDC, however there is about 3 degrees of rotation where the stroke is completely out on 1 and 4 and they remain idle. The gauge will not move for this duration. So I would imagine that one would consider this a percentage off but in reality the stroke is all the way out. The amount off would be hard to determine based on the amount of movement read with the dial indictor on the piston. Not to mention of the cams were to far off a CEL would be set off
01-24-2006, 04:03 AM
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I like the part with the turbo tubing, as it really sounds like Porsche.
The sportec cars are quite fast, that's for sure. A customer 580hp 996tt cab made 357kph (223mph) with roof up and was faster than all the tuners cars in that shootout.
They have a very good ECU programmer
The sportec cars are quite fast, that's for sure. A customer 580hp 996tt cab made 357kph (223mph) with roof up and was faster than all the tuners cars in that shootout.
They have a very good ECU programmer
Originally Posted by Kiko
... Two of the most important mistakes were regarding the intake cam (off by almost 1 degree on most 996tt from factory) as well as some of the turbo tubing that have wide diameter on the sides but are narrow in the middle section! Apparently porsche wanted to use the same part for the tiptronic where there is restriction of space..! The last 2 "improvements" had as a result the engine to produce more and more power until 7,000rpm+ instead of up to 6,000rpm of the stock engine. So all of the above yield 540hp and 850nm of torque."
Has anyone ever heard of these issues before?
Has anyone ever heard of these issues before?
01-28-2006, 11:07 AM
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True, it was expensive (I did not have the choice not to do it unfortunately) but after the repair what I got back was really a different car.. It was pretty impressive since there was noticeably less vibrations, less noise, smaller consumption and.. a lot more torque and power. Not to mention hardly any oil consumption anymore. It felt like it was a different engine altogether.. I guess this must be the benefit you get from essentially now a hand-built engine that is blueprinted compared to sth that came out of a production line. With the limited mods my car should have been 30-40hp and 100 NM less hp/torque.
If money was not an issue I would do it again in the 997 turbo. I have a lot of "before" and "after" pictures if anybody is interested.
If money was not an issue I would do it again in the 997 turbo. I have a lot of "before" and "after" pictures if anybody is interested.
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01-28-2006, 02:12 PM
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Originally Posted by Zippy
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