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biz77

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    Spokane, WA
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    335i

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  1. FALSE! When an amplifier clips it doesn't produce any additional power, it is just that the average power and peak power are about the same. This is not a failure caused by too much instantaneous power. It is a failure caused by exceeding the thermal limits of a driver - too much power over a given period of time.
  2. Unless your clutch was slipping the whole way down the track or you are an extremely slow shifter, the only thing accounting for the ultra-low trap speeds is the car running low on power relative to the mods.
  3. Are you sure your clutch wasn't gone before you went to the track? 2.5 60' would basically be easing off the line and rolling on the throttle. With a decent holding clutch you should easily be able to cut 2.0 or lower 60' times. My bigger concern, however is that your car is WAY down on power. 98-99mph trap speeds indicate just a little better than stock power. I would scrap that UTEC as soon as possible and go with a tuning solution that utilizes a reflash of the ECU. Piggybacks are okay when there isn't another option. That turbo should be capable of at least another 5mph at the end of the quarter mile.
  4. Clearly you've forgotten what the top-end of the stock turbo is like:) Yeah, you have the heat, but my altitude doesn't help. I'll be back in OC in August for a week. I'll try to get out there, but no, I will not be launching anyones car;)
  5. SAY WHAT???!!! BTW, if you scroll back to post #20 in this thread you can see how my stock turbo, stock tire, stock suspension, stock clutch, stage I car compares. Clearly I need to attend the LALGT school of launching;)
  6. That is the same one I've had success with.
  7. ^ Have the same cable for my Audi. My Tactrix cable recently crapped out on me and I had to try this cable for flashing. I'm happy to say, that with the FTDI drivers in place, this cable is 100% fuctional for all aspects of tuning on my 2006 LGT using Vista Home Premium.
  8. ^ This is a poor way to set-up your gains if you like to get the most from your equipment.
  9. Well m sprank, I appologize for physically dragging you into this discussion and making you participate against your will.
  10. Don't try to spin it so you look semi-correct. You are confusing actual cause/effect with symptoms. The only two things that kill speakers is too much power over time and too much instantaneous power. Distortion does not kill speakers. Clipping does not kill speakers and too little power does not kill speakers. I've shown how I can provide a speaker with all of those nasty things and how it will survive indefinately through all of them. It's not semantics. It's ignorance. It would be like me telling you that my friend died from a headache. As it turns out he had a brain aneurysm, but he said he had a bad headache and then within a couple of hours was dead. I'm going to say that he died from a headache because it is just semantics and that's what I want to say. Do you ever get a headache? Are you dead?
  11. It is both true and what we see in practice. Let's go back to my example and examine why I would be less than comfortable running an amp rated for 400 watts into my 700 watt rated sub under the same conditions as the little 15wpc Panasonic shelf system. Let's say our 400 watt amp is capable of producing 400 watts as a pure sine wave across it's entire bandwidth. A sinewave has a crest factor of 3db, which means that the average power is half of the peak power. Running this particular amp in this fashion should pose no problem to my speaker rated at 700 watts. Now we take the same amp and run it into clipping. This produces what approaches a square wave. Unlike a sine wave, a square wave has a crest factor of 0 db, which means the average power is equal to the peak power. This 400 watt amplifier is now providing power to the speaker that is identical to that of an amp that is running a clean sine wave at 800 watts. But wait! The subwoofer was rated for only 700 watts continuous power. I'm now exceeding the thermal capabilities of the speaker by 100 watts. It probably won't last long under those conditions. So am I underpowering the speaker? Is distortion killing the speaker? Is the clipping killing the speaker?
  12. This is absolutely false: "5.21 What's worse for a speaker, too much or too little power? [iDB] Problems occur (in everyday operation) when distortion is fed to a speaker. This occurs MUCH more often when you are dealing with an underpowered system -- typically the owner will turn up the volume too much or set the amplifier gains too high to try and get more volume from the system. These introduce distortion to the signal -- this will destroy *any* speaker. (See section 5.22 Why is distortion harmful to my speakers? [RK].) " The explanation beyond this is okay, but the statement that distortion kills speakers is absolutely untrue: I can take an old Panasonic shelf system I have sitting at home rated for ~ 15 watts per channel and hook one channel up to the subwoofer system I use in the car - a single Polk Audio SR124 subwoofer. It is rated for 700wrms and 1,400 watts peak per the manufacturer. I can then crank that 15 wpc Panasonic shelf system up so that it is clipping non-stop with very audible distortion. I will be able to do this indefinately and that speaker will not be harmed. The speaker has more than enough thermal capacity to dissipate the power that is being fed to it. Furthermore it can only reproduce the signal that it is fed. It doesn't know the difference between a clean signal, a distorted signal and a clipped signal. That right there disproves that "distortion kills speakers" and also that "clipping your amp kills speakers." So now the question becomes would I be comfortable performing the same test with a decent quality 400 watt rated amplifier? No I would not. Now who knows why I wouldn't?
  13. Just because it is written on the internet doesn't make it true;) The ONLY two things that can kill a speaker are too much power over time and too much instantaneous power. Period. End of story. No further exlpanation needed. It is very easy for me to disprove any of these myths in this thread with real World experiments with items I have sitting at my house or work.
  14. Totally wrong. Distortion doesn't kill speakers. The only two things that can destroy a speaker is too much instantaneous power or too much power over time. If distortion kills speakers, how do guitar amps survive? They are full of distortion.
  15. Yes, entirely possible, but it wouldn't be from underpowering the speaker. It would be from overpowering it. Perhaps if you removed your head from where you have it placed most of the time you could see why that is the case.
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