Dyno tells flowmasters true flow.
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Got my MS4/PRC Stage 1 LS6 dynoed today. All mods are in sig. The flowmaster catback rocks......ok not really. Dynoed through the flowmaster 401RWHP, with my cutout open.....drumroll......433RWHP. Yes that correct folks, a 32RWHP restriction. Thats a ton in my book. Anyway, I was shopping for a new catback anyway so now that I have the dyno proof, it can push me that much harder (like I need it) hehe
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I dont really know. I think its the 80 series. Either way, I wont cap my cutout till I replace the system. Prob gonna magnaflow or B&B. I know they dont flow the best but I love the look and its gotta be better than 32RWHP.
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Wow, very interesting. Just for comparison I had dynoed my Hooker exhaust a couple of years ago the same way. I don't recall the before/after numbers (roughly 320 rwhp closed cutout A4) but the gains to open cutout were like 4rwhp/7rwtq.
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wowow----I use my qtec half the time anyway though and my 6 year old flow/80 sounds very low and mean so i am gonna keep it anyway..at least for awhile.Good to know though.thanx for info.
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I have been posting this dyno sheet a lot of times, but noone seems to pay attention to it. This was on my pretty much stock car done in 3rd gear since my car came with a speed limiter that cut the fun on the dyno short prematurely in 4th gear. Mods are the same except the exhaust...Flowmaster 80 series vs B&B
![](http://homestead.com/mannyz28/files/dyno3.jpg)
And this is without any other mods. With my current cam and LS6 intake and long tube headers, I am sure the difference would be much more substantial, just as Beasst8 is seeing.
Manny
![](http://homestead.com/mannyz28/files/dyno3.jpg)
And this is without any other mods. With my current cam and LS6 intake and long tube headers, I am sure the difference would be much more substantial, just as Beasst8 is seeing.
Manny
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Remember folks, the Flowmaster was costing 30HP on a near 500bhp motor. You WILL NOT see those gains on a stock or bolt on setup. This is because on these setups there is much less exhaust flow, thus the restriction is less. Remember keep things in perspective.
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Originally Posted by Beasst8
Got my MS4/PRC Stage 1 LS6 dynoed today. All mods are in sig. The flowmaster catback rocks......ok not really. Dynoed through the flowmaster 401RWHP, with my cutout open.....drumroll......433RWHP. Yes that correct folks, a 32RWHP restriction. Thats a ton in my book. Anyway, I was shopping for a new catback anyway so now that I have the dyno proof, it can push me that much harder (like I need it) hehe
Also what type of dyno? Dynojet, Mustang. And are these SAE corrected numbers?
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Originally Posted by 300bhp/ton
Remember folks, the Flowmaster was costing 30HP on a near 500bhp motor. You WILL NOT see those gains on a stock or bolt on setup. This is because on these setups there is much less exhaust flow, thus the restriction is less. Remember keep things in perspective. ![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
![Rolleyes](https://ls1tech.com/forums/images/smilies/LS1Tech/rolleyes.gif)
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Originally Posted by Ryan K
See MannyZ28's Post above. ![Rolleyes](https://ls1tech.com/forums/images/smilies/LS1Tech/rolleyes.gif)
![Rolleyes](https://ls1tech.com/forums/images/smilies/LS1Tech/rolleyes.gif)
But all I see is a slightly suspect dyno as it was not done using a 1:1 gear ratio. And I also don't see a 30rwhp difference.
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Ive seen 12rwhp gain through a cutout over a Magnaflow(I believe it was), its on my website before and after(422 to 434).
Last edited by Bo White; 08-05-2007 at 07:39 PM. Reason: Wrong info on my part, was thinkin tq instead of hp...
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The 80 series is always going to be a restriction. I'll only use the 1-chamber race mufflers or 2-chambers on my vehicles. Maybe their race bullets, but I've never heard them in person.
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No i am really thinking about switching it up. My car feels slow but thats kinda a dumb statment since i have never taken it to the track or the dyno and the flowmaster cant be forcing me to loose that much. But now i really feel like i want to.