Remove 4" Spintech Dual Muff and lose less than 1hp? Can it be true?
11-14-2004, 10:56 AM
#1
Remove 4" Spintech Dual Muff and lose less than 1hp? Can it be true? When looking for why my MTI 387 is a little (15-20hp) down on power, MTI dyno'd the car *after* removing the muffler, comparing it to before (with).
The car lost about 1/2 a hp (the lines essentially made one line).
Now... Im all about folks making good mufflers and great products, but Ive heard other folks mention that their Spintech muffler was costing them quite a bit. Jayson (MTI) actually removed the muffler assuming that this Spintech was costing big power just like every other one he's seen.
So the big question is... What's going on here???
I have MTI Stage 3 LS6 heads that flow about .73 E/I ratio, good old Grott 1.75" longtubes, a really nice 2x3 -> 1x4" Y that LG built for me (made huge benefits on the dyno) to a 4" Mufflex with Spintech 4" dual 3" out muffler.
Help? I dont believe my own numbers
The car lost about 1/2 a hp (the lines essentially made one line).
Now... Im all about folks making good mufflers and great products, but Ive heard other folks mention that their Spintech muffler was costing them quite a bit. Jayson (MTI) actually removed the muffler assuming that this Spintech was costing big power just like every other one he's seen.
So the big question is... What's going on here???
I have MTI Stage 3 LS6 heads that flow about .73 E/I ratio, good old Grott 1.75" longtubes, a really nice 2x3 -> 1x4" Y that LG built for me (made huge benefits on the dyno) to a 4" Mufflex with Spintech 4" dual 3" out muffler.
Help? I dont believe my own numbers
11-14-2004, 03:57 PM
#4
Originally Posted by Bad Habit Bird
I know when I unbolted my spintech muffler on my heads/cam car I picked up 16rwhp and 18ftlbs 
But when I see 0, it makes me think that somethign *else* is wrong, and Im wondering what...
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11-15-2004, 07:03 PM
#12
Originally Posted by GuitsBoy
Probably a tuning isseu. Maybe youre running richer now that the exhaust restriction is gone, and the rich condition iskilling some of your power.
Im not having much luck finding a quiet efficient 4" muffler that fits well under the car. Im not too excited about giving up the 4" number, but if nothing else, I'll put on a 3" SLP dual/dual and be done with it.
11-15-2004, 09:11 PM
#14
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Originally Posted by Visceral
What did you do about it long-term?
11-16-2004, 12:51 AM
#15
Originally Posted by Louis
I never dynoed your car with out the muffler Chris, just what, open header? That was some time ago, I do not remember the details.
Put it on the rollers and pull the muff there your self. Its a mufflex unit, not that hard to pull right?
Put it on the rollers and pull the muff there your self. Its a mufflex unit, not that hard to pull right?
11-16-2004, 01:19 AM
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Originally Posted by Bad Habit Bird
I know when I unbolted my spintech muffler on my heads/cam car I picked up 16rwhp and 18ftlbs
This really supprizes me, mainly cause I have spintechs. Do you think the loss would be as much with a dynomax bullet to replace it?
