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clord

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Everything posted by clord

  1. RR..... Not necessarily. See my post above.
  2. Hi Gofaster..... I've had similar questions about my '04 GT3 diff and GT3 Cup car diffs......and was still a bit confused. So I sent your write up to a well respected GT3/Cup Car mechanic/driver friend of mine. He has built Getrag trannys and GT3 race motors and, as a driver, knows how the LSDs act and feel on the track. Here is his response to your post: "It is sort of valid. It checks the amount of remaining preload. A new Cup diff will probably hold 200Nm in this test. A well used GT3 diff will probably be near zero. This does not mean the diff is "broken", instead it is worn and less effective than it was when new. The stock GT3 diff does not perform like a real racing diff and people expect them to. In my opinion, the car is better on the track if it has a real racing diff. On the other hand, for normal sporting driving the stock diff is ok." Remember that you are measuring just the preload in the LSD clutch pack...the ramps are still acting to compress the clutch pack according to their angles..... In our case, different angle for acceleration versus overrun....nominally 40% on accel, 60% on decel.<br style="mso-special-character:line-break"> <br style="mso-special-character:line-break">
  3. JBW..... Sounds as if the workshop knows what it is doing.
  4. Hi JWB.... Sorry if I confused the issue. The answer is yes, the 996 GT3RS or 996 GT3 Cup lower rear control arms (not really wishbone shaped) have a bolted split at the inboard end into which you can insert various thicknesses of spacers in order to effectively lengthen the lower arms, thereby getting additional negative camber. I don't have access to PET right now, so I can't confirm the part numbers you list. The spacers are an available Porsche part...at a price. In my own case, I got a machinist to make me a handful of various thicknesses out of aluminum stock. I found (for the front end of my GT3) that the 3/8ths inch just right for the camber I want for the track. These days, there are also other vendors that make split lower control arms that will work. I see then advertised in Pano and Excellence magazines.
  5. Hi JWB.... In addition to the above info, adjustable/split lower control arms came stock on the 04-05 GT3RS as well as the Cup car of that period. Interestingly, when I checked a few years ago, the RS lower control are part numbers were the same as the stock, adjustable/split lower control arms on the front of the 04 GT3.
  6. clord

    Rattle at idle

    Hi RSK..... I've not experienced that in my "04 GT3 at 30K miles. Of course, it rattles at start up after sitting a few days, but not on recent start up or when warm. Do you have the recommended weight oil in it, and not overly old? You might want to measure the oil pressure at cold and warm start and see what it is at idle. Let us know what you find.
  7. Hi Magnum... I had a similar oil leak from the rear end of my '04 GT3 engine at 12,700 miles. It was fixed under warranty at my dealer. Since it was under warranty, they did not document the the time nor charges. The leak was at the rear end of the intermediate shaft seal. I'm looking at my service invoice and trying to remember what exactly was done. They do list removing and replacing the coolant pump and associated washers/seals. I believe they had to R&R the pump to get at the IMS seal. They also replaced and exhaust clamp and gasket, impling that part of the exhaust, and possibly the rear bumper, had to be R&Red to get to the seal. You should get a good analysis of the location of the leak before proceding. Let us know what you find.
  8. Beautiful! I agree on the driving experience.
  9. This sounds dangerous. Are there any other associated noises/clunks when you steer back and forth through the steering slack? I've not heard of GT3 racks wearing out...much less all at once. I would get it on an alignment rack where the front end can be raised off the slip plates and thoroughly inspected. Please let us know what you find.
  10. Hi Big Bird..... My personal experience with Joe Fabiano's (Fabspeed) products is about 10 years old. I installed his mufflers on a '99 C4 and also parts of his intake system of that time. The mufflers made additional noise, most of it good, but with some bad droning around 2K-2.5K revs. They fit well and saved some weight. I am pretty sure that they provided no additional horsepower. In '03 I upgraded to my current '04 GT3 and have been much more careful/skeptical about what hardware I mod with. I think that the stuff that Joe has for our GT3s is the exact same products that he sells for the standard 996/997/flat bottom engines. They have the same port spacing and hanger locations. I don't know anything about the cats that Joe uses. I was skeptical that the same tube sizes, etc would be best for the GT3 motor. I did some research and exchanged emails with the brothers Stef and Herman at Europipe. http://www.europipe.be/stages.html They build racing Porsche exhausts of great quality for various race series and have researched what makes power on our cars. For instance: After building and testing many different headers on the 996 GT3, they concluded that the factory, non-equal length headers can't be beat for HP and low end torque. So, now their kits include only mufflers and 100 cell race cats. And they are one of the few kits that actually make a bit more power without losing low end torque. Before popping for Joe's kit, I would do some searches to see others experience with his current products. Let us know what you decide.
  11. The 996 Cup Car muffler has central outlets and I do know that it is one of very few exhausts that increase output somewhat. It also has some sort of catalysts built it, but, I don't know if it has provision for "stereo" O2 sensors (2 per side/one before and one after each cat) that the OBDII system requires. Let us know what you figure out.
  12. Hi aracerx.... You may well have low fuel pressure and it may just be a coincidence to your plug/coil pak work. In my own '04 GT3 I had similar poor running in the minutes before my fuel pump quit. The original pumps in '04 used a variety of hoses on the in-tank pump. Remember that our cars are based on the C4 unibody for it's additional stiffness (as were the Cups cars). The C4 body requires a saddle shaped fuel tank and so the single pump has to have "jet pumps" to lift fuel out of the two low points in the tank (the pump is in a well right below the dome cover). The resulting plumbing is confusing. The pump has one short piece of hose that takes a tight turn in about two inches. It has been known to split at the tight turn. The result is that fuel leaks there reducing line pressure and eventually over working the pump to failure. Have a look. Let us know what you find.
  13. Does it sound like spring/strut creaking? If so, the strut top bearings can often go dry or wear out and result in creaks that resonate in the spring on that corner. This happened to me on two 996's. A C4 and my GT3. Let us know what you find.
  14. Hi X51..... I'm not sure exactly what you are asking for, but, here's some info. Let us know if you want more. The stock GT3 MKII suspension is different from the stock C2 parts. It's height adjustable coil-overs. The springs are H&R. The front lower control arms are split at the inner ends to accomodate spacers such that additional negative camber can be had beyond what can be done at the front strut tops. The rear lower control arms are not split (but the GT3 RS ones are). The dampers are not adjustable. The ride height is about 30mm lower than the C2. Let us know what else you want.
  15. Can you tell us what the resolution was for your problem? Thanks!
  16. It is quite a coincidence that the guage cluster went bad just as you had the front bumper work done. Did the mechanic read and show you the failure codes indicating the cluster failure? Did you re-try the ECU/computer reset with a 4-5 minute disconnection time? Let us know what you find out.
  17. How long did you leave it disconnected? Give 3-4 minutes.
  18. Hi bobsan.... I just changed mine at 28K miles. Factory installed Bosch FR6 LDC came out and a new set of same went in.
  19. Some, or all of the intermittent functions that you describe are managed by the ECU and options set in it. For example, the cruise control is an option in our cars and it won't work unless it is 'turned on' in the ECU programming. Have you tried disconnecting the battery (with the negative terminal) for a few minutes and reconnecting it to reset the ECU? Let us know what happens.
  20. cg962..... Any new news on your failure?
  21. Hi JBW..... For the track and getting there and back, I've run only Pilot Sport Cups on my '04 GT3. As you say, they are 'factory fitment' for the GT3. They ride harder on the street than the PS2 but grip significantly better. I spent a half day on a very wet, cold track last month on a new set of the Cups. I was very wary of the grip and handling, as much for the temps as the wet track and standing water. I was actually very pleased with how they handled. Of course, they hydroplaned across standing water at speed on the straights, but, overall, did a great job of mechanical grip on the only wet parts. It was cold enough that I could not get normal heat into them, so ran cold pressures that would be fairly good hot (32/35). But, overall they did fine. Remember they were new and, therefore, had the new tread depth. For what it may be worth...........
  22. You may be hearing the limited slip differential. It's audible at low speeds, when turning slightly and going both forward and backward with a gear engaged. If it is that, you can diagnose it by putting it in neutral and letting it coast forward or back at low speeds. The sound will not be present if there is no forward nor rearward drive to the diff from the gearbox. The diff then just acts like an open (non limited slip) diff. Let us know.
  23. Hi CG.... As you probably know, out GT3 engines are a totally different engine from the 'usual' 996 engines. It is the 'usual' engines that have most of the reputation for RMS and IMS seal failures. That said, the 996 GT3 engines have experienced an unusual number of RMS seal leaks/failures. It's been hard to predict which/when a GT3 RMS will leak. For instance, mine is original and not failed (fingers crossed). A friend had a GT3 that was just 2 serial numbers younger than mine and his failed at least three times. All replacements were completed under warranty.....then, he sold it. As for your low speed knocking, I'm not sure what it might be. Can you be more specific? Does it happen when turning? When engines is pushing? as opposed to on overrun? Any tire flat spots? Are the CV joints sound? Let us know what you find.
  24. Hmmmmm...... If I am reading the carfax history correctly, it was originally sold out of dealer inventory in March, 2003. The first US Mk II GT3's (Model Year 2004) made it to customers in about August 2003, Mine was the first in Colorado, and I took delivery from factory order on 8th Sept, 2003. Then the first owner apparently had two crashes in the space of three months. Now the car has 119,000 miles on it. I know that all of the original shipment of Mk II GT3's to the US were held in the port during July, 2003 for an ECU update. If I am reading the carfax correctly, I question that that car is a GT3. The factory Aerokit II for the 996 is the same as the GT3 body kit too.
  25. Hello petercory.... Your problem sounds very much like an issue that quite a few '04 GT3's had during the first year, although, I haven't heard of it happening in the last few years. The plumbing in the fuel tank is quite complex and the filler tube can kink inside causing just the problem you describe. The Mk II GT3 used the C4 unibody for it's additional strength/torsional stiffness. The C4 shell leaves room for the front axel drive that, of course, the GT3 does not have. So, the fuel tank is saddle shaped to clear the front diff that's not there. There is a lift pump in each low point of the tank that pumps into a central gas surge well that has the final pump in it. Suffice it to say, there is a lot of plumbing and wiring in there. I would take to a dealer as the problem is more likely to be remembered by Porsche techs that have been around for a few years. There may well be a TSB on the issue too. Let us know what you find out.
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