Moroso Spiral Flow....ugh
#1
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Moroso Spiral Flow....ugh
So i decided to purchase one of these to put after my Y-pipe where it meets my I-pipe to quiet down my exhaust. (I/H/C with Long tubes,ORY and GMMG).
well it definetly did a somewhat decent job of quieting it down at idle.. and tammed it at WOT. So i was somewhat happy with it.
Until i decided to goto a local dyno day.
my previous best pull (SAE corrected) was 419.5 rwhp and 399.5 rwtq
so with nothing changed other then the addition of the moroso spiral flow (same dyno BTW)
first pull 371.7 RWHP 357.6 RWTQ!
WTF! where did all my power go... so i decided to undo my exhaust at the y-pipe and take off the moroso spiral flow and just run open y-pipe.
420 RWHP 386.6 RWTQ! (TQ is probably down due to the shorter exhaust length)
thats right... the moroso spiral flow robbed me of nearly 50RWHP!!!!!
the test was done on the same dyno... on the same day 1 hour apart (time it took to get that damn thing off)
sooo anyone considering this thing... beware!
i will post my dyno graph for all to see
well it definetly did a somewhat decent job of quieting it down at idle.. and tammed it at WOT. So i was somewhat happy with it.
Until i decided to goto a local dyno day.
my previous best pull (SAE corrected) was 419.5 rwhp and 399.5 rwtq
so with nothing changed other then the addition of the moroso spiral flow (same dyno BTW)
first pull 371.7 RWHP 357.6 RWTQ!
WTF! where did all my power go... so i decided to undo my exhaust at the y-pipe and take off the moroso spiral flow and just run open y-pipe.
420 RWHP 386.6 RWTQ! (TQ is probably down due to the shorter exhaust length)
thats right... the moroso spiral flow robbed me of nearly 50RWHP!!!!!
the test was done on the same dyno... on the same day 1 hour apart (time it took to get that damn thing off)
sooo anyone considering this thing... beware!
i will post my dyno graph for all to see
#7
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I dont know what to think. I love my exhaust and it sounds great, but I ma down on power and a friend of mine has said he has seen the muffler rob power as well. I have 3" TDs with 6" long resonators, dr. gas X, and spiral flows dumped at the axle. Granted the motor was brand new when I dynoed it with cheap conventional oil. I am going to put a couple hundred more miles on it and then dyno again with mobil 1 and see where it is. Then swap the heads, headers, exhaust, maf, and lid.
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#9
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I dont really see how they could rob that much HP. I mean, I can see a little restriction and added backpressure. But 50rwhp? Thats insane. Well, dual cutouts from the headers is always an option.
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nothing seemed to rattle inside after i took it off to indicate that one of the baffles were loose.. as the dyno day was the very next day after i put it on...
i think it was just to much flow for one... on a TD setup they may be fine since its one per side...
i think it was just to much flow for one... on a TD setup they may be fine since its one per side...
#20
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Was at the Dyno myself to witness this! Hell, we put it on the day before! haha
I must say.. it was quite interesting to see the difference.. and then the ride home with an open y-pipe... oh my!
I must say.. it was quite interesting to see the difference.. and then the ride home with an open y-pipe... oh my!