Can 600-750hp be quiet?
- Thread starter Hickfied
- Start date
millhouse
Founding Member
The only way I know to keep it quiet with that horsepower is........................... Dont crank it!
With a turbo setup, that's not the case. Granted there is no hiding the sounds of a BOV and turbo spool (to some extent), using a mild cam and some decent mufflers it's quite easy to have a quite ride while scooting around town.
I just don't want to scare the people that are cruising around me into not wanting a light with me 
Also when it comes to racing, most people here either have 125-250 nitrous, or a 9psi blower, on a stock engine. I don't wanna scare them off either
Also when it comes to racing, most people here either have 125-250 nitrous, or a 9psi blower, on a stock engine. I don't wanna scare them off either
ill advised
Member
juiced_94gt
Active Member
put on Borla Pro XS mufflers...my car sounded stock even with NO CATS!!!! quietest muffler ever and it flows VERY well
QUICK91LX
Founding Member
The actual exhaust note when on the gas of a turbo car isnt loud compared to a nasty N/A combo, the turbo itself actually acts as a sort of muffler. At idle is a different story, but a pair of cats and some basic turbo mufflers shouldnt be too horrible. You shouldnt be running too big of a cam with that turbo setup, so at idle and below 3000 it should sound pretty much like any other bolt on 5.0. and yes, it really is best to use a straight through style muffler like dynomax or magnaflow. They are called turbo mufflers for a reason!! chambered mufflers have been known to rob turbo cars of a little power.
Dynomax Super Turbos are chambered mufflers. And yes, I know it'll cost power. The guy wants it to be quiet and I'm not going to tell him that he can't run chambered mufflers when he absolutely can. Obviously, that's not going to make the most power, but it will be the quietest.
Chris
Chris
Don't make your opinion sound like a fact. I ran flowmasters and then Superturbos - both chambered mufflers with my incon Twin Turbo kit. Made 420 rwhp at 10 psi. Don't know what it made on 12...
QUICK91LX
Founding Member
Dynomax Super Turbos are not chambered mufflers, they are a turbo muffler design. Perforated tubes that flow the exhaust gases in a specified direction, the sound control comes from the restriction of these tubes...
Flowmaster uses various baffles in a series of stages or "chambers" which control sound by reflecting it off of these baffles. This is an example of a 3 chamber or 50 series flowmaster, the intial first chamber is the one with the angled baffles, the other 2 are the ones that are side by side further down in the muffler.
Its this type of restriction that hinders forced induction performance. the straight-through flow pattern of a turbo muffler is more beneficial
millhouse
Founding Member
There are no opinions to it, just facts. There are many...many...many examples over on turbomustangs that have picked upwards of 70rwhp by simply swapping their flowbastards to a straight through design. Backpressure is the enemy of a turbo...and you are better off running an open downpipe.
I myself had a NOTICEABLE change in performance when I removed the flowbastards and ran a straight pipe. The turbo's spool way quicker and I noticed a definate increase in power.
No, it's not an absolute must to run a straight through muffler...but it's best to do it once and be done with it. If he's to buy a muffler now...IMHO it's a must.
Dean85GT
New Member
Just buy an electric cutout and run a tiny and junky exhaust. Believe me, electric cutouts are perfect for this. My friend runs one on his turbo grand prix and he picked up 30rwhp with it open....and when its shut, nobody is the wiser. If you ever want to beat on it just flick the switch and instantly you have full power. I think its a win win situation
juiced_94gt
Active Member
Im telling you, Borla Pro XS made my car WITH NO CATS quieter than when it was stock I PROMISE THIS IS WHAT YOU WANT OR I WILL BUY THEM BACK FROM YOU.
Damn that's actually a good idea...i never thought of that for a turbo setup...i could run a 3 inch downpipe from my turbo, fit it with a Y at the end and put the cutout on one end and then a typical 2.5 or even 3 inch exhaust all the way out....then sneak around normal with full exhaust, and crack it open for beating on the imports.
Damn that's actually a good idea...i never thought of that for a turbo setup...i could run a 3 inch downpipe from my turbo, fit it with a Y at the end and put the cutout on one end and then a typical 2.5 or even 3 inch exhaust all the way out....then sneak around normal with full exhaust, and crack it open for beating on the imports.
That's what my plan is, I just need a quiet muffler!
Aliate X
Member
Dynomax Super Turbos are not chambered mufflers, they are a turbo muffler design. Perforated tubes that flow the exhaust gases in a specified direction, the sound control comes from the restriction of these tubes...
Flowmaster uses various baffles in a series of stages or "chambers" which control sound by reflecting it off of these baffles. This is an example of a 3 chamber or 50 series flowmaster, the intial first chamber is the one with the angled baffles, the other 2 are the ones that are side by side further down in the muffler.
Its this type of restriction that hinders forced induction performance. the straight-through flow pattern of a turbo muffler is more beneficial
the dynomax mufflers might not be actually "chambered" but it still has a similar effect of power loss compared to something straight thru like a borla turbo xs that is still very quiet.
Thanks for the correction Quick91LX. I didn't know that. I did know that it was more restrictive than the straight through designs, though.
That's what I think he needs to know. What's "best" for one person isn't necessarily best for another. He might be willing to give up (a more realistic estimate of) 30-40 rwhp. At that power level it doesn't make a huge difference, especially if you can't get traction on the street, anyway. If he puts making "a sleeper" ahead of "making power," then perhaps something like the superturbos would be "best" for him.
Chris
millhouse
Founding Member
I understand what your saying…but it's so hard to justify (in my mind) sacrificing that much h/p for sound, especially considering there are alternatives for the same price that are considered to be very quite in their own right. To add to that, chambered mufflers will delay spool thus hurting the h/p and torque curves. The negative effects are beyond simply the loss in h/p. Even if you were to "up the boost" to compensate for the restriction, it's likely that you would run slower 1/4 times because of the narrower powerband!
Alright, I’m done ranting….for now.
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