george996

very nice. are the wheels porsche or aftermarket?

Display: 2 - 3 k 0hm at 20 °C.

Hello gt3 forum,

I am considering a 2004 gt3 (30,000 miles) and would like to know what to look for. The crankcase is leaking near the seam near the rms. The current owner has an extended warranty and Porsche is replacing the crankcase halves.

Any suggestions/comments will be appreciated.

P.S. I am currently driving a 2004 996

i installed the new power spring and cannot believe the difference. Pedal effort is minimal! Just think, i was about to replace the clutch and already pursched the parts.

just an fyi. Several months ago i heard some noise while depressing the clutch and then it seemed a little more difficult to depress. last night it made the same noise but this time the clutch pedal became noticably firmer. took out the clutch power spring and found that it was in three pieces.

will update this post after installing new part this week.

regarding the cat eff., what is the mean amplitude after the cat?

I don't know if the trans is interchangable but i can tell you that the pressure plates have different dimensions so you will have to sort that out as well. The distance from the pressure plate spring, where the throw bearing makes contact, to the flywheel face is different. Perhaps the clutch fork needs to be changed as well but i am guessing.

Quite simply no it does not fit. If you laid them next to one another you will notice the 997s has the pressure ring is extended out of the housing quite a bit, this requires the flywheel to mount basket style where as the 996 is flat.

regards

yes, the pressure ring extends out of the housing compared to the 996 pressure plate. However, you will notice that the 997s flywheel has a raised portion where the pressure plate fastens to it. This compensates for the difference in the pressure plate. The attached images shows the difference between the 996 and 997s flywheels.

996_flywheel.pdf

997_flywheel.pdf

996_pressure_plate.pdf

997s_pressure_plate.pdf

Therefore, it looks like to use the 997s self adjusting pressure plate it must be used with the 997s flywheel. Then the question is whether the 997s dmf will fit the 996. Does anyone know?

Does anyone know if it possible to install 997 S clutch in a late model 996? The 997 S pressure plate has a self adjust mechanism which compensates for wear of the clutch disc. This is a nice feature since the pedal effort remains constant over the life of the clutch.

997_S_Clutch.pdf

looks like pelican parts sells the transmission mount for the 996. see the link.

http://www.pelicanparts.com/cgi-bin/smart/...9%20M%2FT%20%20

i recently changed my stock 996 headers to the 997 type. had no problems removing bolts but did apply some wd-40 the night before. used a 13 mm socket and torque wrench for the entire project.

i did not notice any performance change, just a slightly different sound but very minor. the 996 headers have longer primary pipes and maybe there is a little more low end torque. Not sure it was worth doing from a performance aspect. my reason for replacing the headers and cats was to eliminate vibration and it did. car runs and feels very smooth.

why do you think the stock headers are a poor design?

for whatever it's worth, the 2002-2004 normaly aspirated 996's with 7.8dme do not have intake manifold vacuum sensors, therefore cam timing and valve lift are actuated from other inputs (i.e. rpm, load, etc.). I have the dme manuals and will look for info on the gt3's.

You are correct, the washer will rattle. I installed pss9’s and stopped the rattling by sliding/pushing the black bump stop all the way up so that it held the washer against the top mount.

Thanks george996 for the idea. It turned out to be a vacuum leak.

a vacuum leak is a lot better to have than a valve lift problem. do you know specificaly where the leak was? i would like to know. regards, george

without hearing the noise i think it is valves switching from large lift to small lift position. that would explain why you need to rev the engine over about 3,200 rpm for them to switch to large lift. if you have durametric software you can test the valve lift solenoid valve and try to duplicate the sound. playing around with durametric i can make my 04 996 make a similar sound.

Pages_from_2002_996_Carrera_Technik.pdf

I removed them on my 2000 996 which had lots of rust and corrosion. The bolts actually came out pretty easy, although I have read of eople breaking them off. then you might have to use an extractor, possibly coil them. the bigger problem amy be the bolts that connect the header to the cats. I did not remove these as they were completly corroded, and looked like they were studs welded to the cats, I did not want to take the chance of breaking them. there are lots of member who have put on headers, they may have more advice for you. Good Luck!

Heat is also a good technique...

would you heat the bolts with a torch?

Thinking of replacing exhaust headers but worried about snapping bolts, gauling threads, etc. Does anyone have any experience and tips removing bolts?

thank you

I was going to have my Manual transmission /Front differential fluid changed . The car only has 15k miles but it is a 2002 and I am always ahead on fluid cahnges. My mechanic is prepared to do it for me as long as I provide the fluids. Short of buying directly from Porsche dealership ...can anybody advise as to what is the original factory fill fluid, is it a special Porsche formulation or can I buy it without the Porsche branding?

Would it be better to use an alternative product? The car is predominantly driven on the street in very high ambient temperatures .I see alot of guys mentioning Redline products.

Thanks for your suggestions.

i have first hand experience with the Mobil 1 synthetic and the factory fluid. please see attached Rennlist link.

http://forums.rennlist.com/rennforums/996-...nual-996-a.html

Alan,

That’s great the vibration is gone but you probably affected something else when changing the AOS. I don’t know the Boxster, did you have to remove and replace the exhaust? The variocam adjustment is independent of oil pressure.

Take a look at this thread http://www.renntech.org/forums/index.php?s...c=17104&hl=

Also, did you notice the vibration in all gears and stationary?

George

I just replaced my Boxster's AOS on a 2003 with a 2.7L engine, 65,000 miles, 5 speed manual transmission. An unexpected byproduct is that an engine vibration at about 3200 rpm's that Porsche said was normal is completely gone. I also cleaned the MAF but surely that was not the fix. If you have a vibration that occurs after warm up when accelerating thru this rpm, driving on the highway at this rpm, and more pronounced decelerating in gear thru this rpm, and you have not replaced your AOS, you might just want to try this. I would welcome any dissertation anyone out there may have as to why this may be so, although I have my theory and told Porsche that in 2004.

Have at it.

I would like to know your theory how the AOS would cause a vibration. I have a 996 and sometimes notice a vibration at 2000 rpm.

Hopefully this will help someone. I replaced my transaxle fluid last summer with Mobil Synthetic Gear Lube 75W-140 last summer and had no issue at the time. However, when the ambient temperature dropped into the 40’s and 50’s here in Southern CA this winter it became difficult/stiff to shift into 2nd and 3rd until the trans heated up.

I reviewed all the posts and decided to replace the fluid with Porsche transaxle fluid (about $100 for 3 liters from the dealer). I probably would have tried Shell Transaxle but could not find it and was anxious to make the change.

I am pleasantly surprised with the difference. There is definitely a significant improvement (reduction in force). Also, after only a few minutes shifting feels as normal as a warm trans. The biggest improvement is when the trans is cold but I notice a little more smoothness when warm.

So George and Perucho there is no resonance coming in at 2000 to 3000 RPM? Stage 2 connects the inlet and outlet correct? I had e-mailed Darin before I bought this exhaust. He didn't have one for the tiptronic which is different than the six speed.

No drone/resonance between 2000 to 3000 or anywhere. it is a little loud when you accelerate hard but sounds great. Another observation, you can feel when the variocam plus switches to large valve lift at about 3,200 rpm. You can't feel this with the stock exhaust. Also, when starting from a dead stop (i.e. low rpm) the exhaust sound gurgles a little and is not as pleasant as the sound at higher rpms. I am very happy with this mod and would recommend it.

The dfister mod is great. no drone. It really sounds great above 3k rpm when accelerating.

Does anyone know where the non-return valve (item no. 5 ) is located? It is used in the Variocam Plus system beginning 2002 for 996’s. I can’t find it as a standalone part in the parts list so I am guessing that it is integrated into the valve tappet housing or in the Variocam hydraulic actuator valve.

I think they are talking about the pressure relief valve on the oil pump housing.

Loren, I think the pressure relief valve is something else. The non-return vavle is like a check valve.

Does anyone know where the non-return valve (item no. 5 ) is located? It is used in the Variocam Plus system beginning 2002 for 996’s. I can’t find it as a standalone part in the parts list so I am guessing that it is integrated into the valve tappet housing or in the Variocam hydraulic actuator valve.