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06-16-2008, 07:39 PM | #67 | |
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Was the loss greater than the inherent dyno error? Were the pulls done with mufflers on first and removed next? I'm sorry if I seem a little incredulous but I just find that very hard to believe. |
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06-16-2008, 07:53 PM | #68 |
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Thanks for the update. Looking forward to the next update. Interested in what the difference in sound and performance will be between the race and street versions.
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06-16-2008, 08:16 PM | #69 |
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HP loss with exhaust systems is common with the S54 motor. This is why most companies try to just have it not lose power or gain maybe 1-5hp. The stock exhaust flows very well it just happens to be ugly I had 3 different exhaust systems on my M3's 2 of them added nothing and a 3rd lost 5 hp.
My Supersprint gained a staggering 3hp when I did a back to back dyno with it. The reason I spent the $$ was it was the only exhaust at the time that did not drone was good looking was lighter then stock and was not rice loud. I think if you back to back dyno most low cost aftermarket systems for the Z4M you might find power loss in several systems. Props to RPI for not making something just because the demand is there |
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06-16-2008, 08:18 PM | #70 |
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I agree...and you need to add an ACS logo to your sig.
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06-16-2008, 08:33 PM | #71 |
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I wouldn't expect to gain any significant HP in this car based on what I've read, I just disagree with the assertion that you would lose HP by removing the mufflers. Thats one of those long standing old-wives tales that just bothers me.
The reason I'm interested in an exhaust is purely for the sound. I appreciate the vendors dedication to the quality of his product I just find it a little frustrating when some vendors (and I'm not saying this one) justify ridiculous pricing based on R&D of simple systems such as muffler cans. |
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06-16-2008, 09:01 PM | #72 |
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It's not the increasing the flow out the back loses the power, it's that the software steps in as a safety feature and cuts the power. BMW is known for it particularly when comes to the S54.
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06-17-2008, 12:16 AM | #74 |
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That's one area i am thinking of and hopefully with the new exhaust we can get some gain...
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06-17-2008, 12:24 AM | #75 |
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What i ask you is if your going to post it or if you want me to post it...people might get the wrong idea that i want the loss of power a secret (i don't think so) FYI guys I'm not going to put my name on any product that does not work period...
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Last edited by laidback; 06-17-2008 at 12:50 AM.. |
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06-17-2008, 06:41 PM | #76 | |
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06-20-2008, 03:22 PM | #77 |
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Any updates as to how the exhaust is coming along?
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06-20-2008, 03:46 PM | #78 |
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06-20-2008, 06:55 PM | #79 |
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Sounds good...I'll be sitting here waiting anxiously for our GT exhaust
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06-20-2008, 07:00 PM | #80 |
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Hehe, sounds good man. Thanks to everyone for being patient with us. The exhausts are pretty tempermental with this engine so we have to really spend some time with the development. I dont want to make a product that only sounds better.
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06-20-2008, 07:14 PM | #81 |
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If backpressure is an issue, a converging/diverging throat should help.
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06-27-2008, 02:17 AM | #82 |
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RPI will be doing the exhaust soon and hopefully we'll get the prototype by Mfest!!!
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07-08-2008, 03:54 PM | #83 |
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Looking forward to pricing myself!! Go Eloy go Eloy go!!
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07-11-2008, 02:40 AM | #84 |
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Welcome Brad glad to have another M5/M6 guys on board
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07-22-2008, 10:23 AM | #86 | |
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We have people copying stuff to save $129 so I'm not sure how we can put something in production that is going to be at the $2k range. |
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07-22-2008, 11:55 AM | #87 | |
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Let's see what others have to say. |
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07-22-2008, 12:02 PM | #88 |
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Yeah, i dont think we can do all 3 sections for that price. Ill hav to wait and see as we explore different options. The muffler is what is killing us right now. The muffler design we want to use is very untraditional and quite costly to make.
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