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KevinMac

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Posts posted by KevinMac

  1. P1128 or P1130 (oxygen sensing at rich threshold) is stored in the memory, this means that the fuel/air mixture is too lean.

    Look for vacuum leaks, bad injector, fuel pump delivery, leaks in the exhaust etc.. Not sure about the 996, but I have seen this problem when the vacuum canister is rusted out. Is the vacuum canister in the right fender of the 996? The buzzing may be that!

  2. I was trying to avoid this, but now I think I need the same assistance. Gettiing ready to upgrade to Litronics, will have to pull the battery cable and of course never got the dealer to provide me with the code for the stereo

    Model BE4462

    SN X5037966

    Thanks in advance.

    Try 7143

    or

    7141

    Loren - always helpful, thanks!

  3. Actually the newer driver materials are not as heavy as paper cones. Reason being paper ones need to be of a thicker paper to keep cone distortions down as compared to kevlar, graphite etc.. Wattage rating of speakers is really not a priority one should worry about as much as frequency, sensitivity and distortion. Lower impedance usually requires more amperage thus heavy output stages of the amplifiers are needed. For instance, 4 ohm nominal speakers due to driver movement can actually be seen having less than 4 ohms under certain frequencies.

    The reason better speakers need more power is usually they produce more bass, which requires more cone excursion and heavier magnets. Thicker materials can provide less distortion under longer excursions. Bose unfortunatley cannot produce the full audio spectrum with any authority due to there driver construction. Bose engineering concentrates more on imaging then actual overall delivery which is comprised of dynamics, frequency, low distotion across the full spectrum, and full frequency. Usually Bose drivers are too small to actully deliver the lower end hence the loss of the dynamics. Great on midrange!

    An amp in itrself will not provide any better sound quality thru a marginal driver. So just the opposite should be done, replace the drivers first. Most after market drivers will work fine on a 20 watt amp. Most mobile audio speakers mniimul wattage to produce quality sound will fall within thecapability of a 20 watt amp. The amp is needed to drive the better quality speakers to higher levels. Which should allow less distortion at the higher levels. When you have an idea of the configuration you want, configured the crossovers then amp up providing a bass driver and adjust the crossover to match your acoustic environment.

    The replacement of the drivers first will net you an improvement, on their own merit.

  4. MX - going from 87 to 93 there would be a difference, since 87 is too low in a 11:1 compression ratio causing preignition with fuel lower then 91. Porsche specifically says to use 93 but 91 can be used, since this is in the lower parameter for the knock sensor to adjust accordingly. This is the reason Porsche has a recommended octane and a mnimul octane listed. There is only so much advance and fuel adjustment based on the maps written for 93 octane. Once again, these maps can be tailored by using a chip or map upgrade to take advantage of higher octane. The only true way to know if performance is different is to actually use a dyno, since driving can effect performance. I'm in 90 plus heat and running anything more than 93 octane has no increase in performance.

    It is true that combustion temp is a factor in the determination of octane, as is pressure. So as you go to a higher altitude you could litteraly use lower octane since the available air is thinner and in essence lower compression. BTW octane measurement uses temperature as a an input to determine octane. So running at 85 degrees a sea level, should provide max performance as specified by the manufacturer.

  5. Mxdave - you seem to be forgetting that the fuel and advance curves are already mapped, they are not open ended, so even if environmental conditions would allow as you say more advance etc the map will restrict, regardless if there is a knock sensor or not. Hence the reason for rechip or tune via a dyno and remap. So stock ECU with factory fuel and advance maps, it is very safe to say 100 octane will buy you nothing. You are limited by the predetermined map. Maps are not open ended there is a limit.

  6. The manual specifically states that the recommended octane is 93, but 91 can be used and performance will be lost since the knock sensor will come into play.

    Maps usually provide a curve based on the max amount of perfomence and driveability under stock conditions and available octanes. Now if 100 was readily available and the maps were written to it, then you probably would get more performance.

    Porsche would capitalize on every thing available to increase output with less cost.

  7. Need your opinion and help to the following, thanks in advance!

    Purchased a 2000 C2 a week ago very low mileaqe (24k), looks brand new. So far love the drive.

    1: The vehicle never came with the factory recommended maintenance book showing the oil change intervals etc.. I do have the owners manual. Is there a source to get the maintenance manual or chart?

    2: Looking into changing out the gearshift and brake lever to a better looking one from CARNEWEL.com. How much time and effort is needed to do so.? Without really looking into it yet, does the center console have to come out.

    3: Champion motors here in S Fla has the upgrade Litronic Xenon headlight kit for $1,300 their labor is $540 to install.

    Does this seem to be high on the labor?

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