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SVT Shelby GT500
Help choosing a blower upgrade
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<blockquote data-quote="Willie" data-source="post: 16163030" data-attributes="member: 14133"><p>This is my first post this year and it's almost April... That's what a chronic illness can do I suppose. I did not take the time to read any of the above, except the OP, so I don't know if anyone has already mentioned this or not, but here goes..</p><p></p><p>I have had many superchargers over the years, including other cars and different blower designs and I've been tuning them all along. One thing I've learned that I'd like to share....</p><p></p><p>It's a natural tendency to "upgrade" to the "next generation" or the next "better" design. Please note that I am not making inferences to any specific brands or blowers. I've bitten this bug several times too. But what seems to always happen is that once you get used to the newfound power, you eventually still want "just a little" more. It never fails, it seems. So we are forever sucked into this money machine. Well, last year....</p><p></p><p>I finally made a slightly different decision. Instead of going to the "next generation" as some would call it, I decided that I would not fall into this trap again.... that I was going all out and once I decided what to do, that this was it.... no more "upgrading"... Sure it cost a little more, but I viewed this as the last time. So I went big. That was over one year ago and my results have exceeded my expectations. Specifically.....</p><p></p><p>As I mentioned, I tune my own cars so getting it to run as best as it could was not a factor. During the repeated process of datalogging and modifying the tune, it become obvious almost immediately the massive power increase I was seeing. Let me give you some numbers..... While datalogging on the streets, I always ease into the throttle, I never mash the pedal. Okay on a dyno, but not the street. Easing into it is the only safe way and it also allows me to see how everything transitions better. Anyway... during one session, I being by holding 2nd gear at 2500 rpms, then start my acceleration. I start spinning, so I lift. Try again, a little less pedal. Okay, made it to 5000 rpms, so I shift to third and I depress the pedal even further. At 70 mph, about 4200 rpms, I spin out and almost lose control. Stop datalog. Review it and I see that at the instant I lost traction, my throttle angle was 42 degrees!! What? I have my idle throttle angle at 6 degrees and WOT at 83 degrees, so 42 is not even half way down. To date (over one year later), the max angle I have datalogged is 44 degrees. To date, I have not pushed the pedal any further... It's freakin' dangerous! And.....</p><p></p><p>This is with the LARGEST blower pulley they make, a 4.00". I do have a 15 percent crank though. Calculations yield a blower rpm in the 12,000 range. The redline is 18,000, so this puppy is just getting warmed up!! Oh, I'm seeing 20 psig on the gauge too. Another spec I should mention.....</p><p></p><p>In my tuning process, I retard my timing excessively when I begin. The above numbers, my timing was set to a meager NINE degrees total advance.</p><p></p><p>Late last year, I went to the track specifically to show my car to the NHRA tech inspection guys.... to see if they would pass me. The answer was no. They pulled out their book and literally showed me that I needed 3 things to pass:</p><p></p><p>1) Eight-point (minimum) roll cage,</p><p>2) Five-point safety harness, &</p><p>3) NHRA competition driver's license.</p><p></p><p>This is my "rebranded" 4.2LC KB... lol...</p><p></p><p>[ATTACH=full]1562176[/ATTACH]</p><p></p><p>BOTTOM LINE: Think about going my route. You'll never "upgrade" again and you'll experience newfound power like you've never imagined and more than you'll ever need. My wife and daughter have said they will never drive this car again, lol... Isn't that what we all strive for? I mean the power, not the girlie thing!</p><p></p><p>I have to go now. Getting exhausted... I don't know when I'll be back, unfortunately..</p></blockquote><p></p>
[QUOTE="Willie, post: 16163030, member: 14133"] This is my first post this year and it's almost April... That's what a chronic illness can do I suppose. I did not take the time to read any of the above, except the OP, so I don't know if anyone has already mentioned this or not, but here goes.. I have had many superchargers over the years, including other cars and different blower designs and I've been tuning them all along. One thing I've learned that I'd like to share.... It's a natural tendency to "upgrade" to the "next generation" or the next "better" design. Please note that I am not making inferences to any specific brands or blowers. I've bitten this bug several times too. But what seems to always happen is that once you get used to the newfound power, you eventually still want "just a little" more. It never fails, it seems. So we are forever sucked into this money machine. Well, last year.... I finally made a slightly different decision. Instead of going to the "next generation" as some would call it, I decided that I would not fall into this trap again.... that I was going all out and once I decided what to do, that this was it.... no more "upgrading"... Sure it cost a little more, but I viewed this as the last time. So I went big. That was over one year ago and my results have exceeded my expectations. Specifically..... As I mentioned, I tune my own cars so getting it to run as best as it could was not a factor. During the repeated process of datalogging and modifying the tune, it become obvious almost immediately the massive power increase I was seeing. Let me give you some numbers..... While datalogging on the streets, I always ease into the throttle, I never mash the pedal. Okay on a dyno, but not the street. Easing into it is the only safe way and it also allows me to see how everything transitions better. Anyway... during one session, I being by holding 2nd gear at 2500 rpms, then start my acceleration. I start spinning, so I lift. Try again, a little less pedal. Okay, made it to 5000 rpms, so I shift to third and I depress the pedal even further. At 70 mph, about 4200 rpms, I spin out and almost lose control. Stop datalog. Review it and I see that at the instant I lost traction, my throttle angle was 42 degrees!! What? I have my idle throttle angle at 6 degrees and WOT at 83 degrees, so 42 is not even half way down. To date (over one year later), the max angle I have datalogged is 44 degrees. To date, I have not pushed the pedal any further... It's freakin' dangerous! And..... This is with the LARGEST blower pulley they make, a 4.00". I do have a 15 percent crank though. Calculations yield a blower rpm in the 12,000 range. The redline is 18,000, so this puppy is just getting warmed up!! Oh, I'm seeing 20 psig on the gauge too. Another spec I should mention..... In my tuning process, I retard my timing excessively when I begin. The above numbers, my timing was set to a meager NINE degrees total advance. Late last year, I went to the track specifically to show my car to the NHRA tech inspection guys.... to see if they would pass me. The answer was no. They pulled out their book and literally showed me that I needed 3 things to pass: 1) Eight-point (minimum) roll cage, 2) Five-point safety harness, & 3) NHRA competition driver's license. This is my "rebranded" 4.2LC KB... lol... [ATTACH=full]1562176[/ATTACH] BOTTOM LINE: Think about going my route. You'll never "upgrade" again and you'll experience newfound power like you've never imagined and more than you'll ever need. My wife and daughter have said they will never drive this car again, lol... Isn't that what we all strive for? I mean the power, not the girlie thing! I have to go now. Getting exhausted... I don't know when I'll be back, unfortunately.. [/QUOTE]
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