Exhaust Cut-Out Results
03-01-2007, 02:06 PM
#21
here is the answer...proven on the track with my car from one pass to the next...with it closed it ran a 110mph and with it open it ran 112mph...these were back to back with same 60fts the car is an auto so no error there either...this was on a SI with a completely stock exhaust and a 3.5" cutout mated to a 3inch cutout for max flow...it is definitely worth it cant argue with 20hp difference on a SI car...will be even more on a cam or spray car
03-01-2007, 06:52 PM
#22
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Originally Posted by chrs1313
here is the answer...proven on the track with my car from one pass to the next...with it closed it ran a 110mph and with it open it ran 112mph...these were back to back with same 60fts the car is an auto so no error there either...this was on a SI with a completely stock exhaust and a 3.5" cutout mated to a 3inch cutout for max flow...it is definitely worth it cant argue with 20hp difference on a SI car...will be even more on a cam or spray car
03-01-2007, 08:26 PM
#24
Originally Posted by 99corvette
No back pressure maybe? It seems like whenever i have mine open, it feels slower. Im sure it helps on top side, but lowend i feel slower. I have a flowmaster muffler and the cats cutoff.
03-01-2007, 09:27 PM
#26
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Originally Posted by Denom
Ehh, you have the chokemaster catback exhaust. In that case a cutout should give you more power. Mayhaps the track conditions weren't that favorable.
03-01-2007, 09:28 PM
#27
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Originally Posted by craz1469
theblurls1 told me he ran the same time and speed with it open as he did with it closed......he had kooks, 4inch y, bullet muffle, then a slp dual dual
03-06-2007, 01:08 PM
#29
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Nope i ended up only going down the track once because i had nitrous problems, but i got them figured out, and i will be ready for this sunday.
Last edited by 99corvette; 03-06-2007 at 01:42 PM.
03-06-2007, 01:23 PM
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I picked up .2 at the track, and see no real reason to put the cap back on. I am currently running stock manifolds, High flow cats with a Magnaflow muffler. It will be on the dyno in early april I'm going to try it with and without just to see the results.
03-06-2007, 01:43 PM
#31
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Originally Posted by White_Ls1
I picked up .2 at the track, and see no real reason to put the cap back on. I am currently running stock manifolds, High flow cats with a Magnaflow muffler. It will be on the dyno in early april I'm going to try it with and without just to see the results.
03-06-2007, 02:51 PM
#34
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It seems the 400rwhp is the key where people actually gain power from a cutout. Our catbacks can be restrictive to a certain point, but with bolt ons it really isn't all that restrictive.
03-06-2007, 07:34 PM
#35
Originally Posted by black01_WS6
It seems the 400rwhp is the key where people actually gain power from a cutout. Our catbacks can be restrictive to a certain point, but with bolt ons it really isn't all that restrictive.
03-06-2007, 07:42 PM
#36
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Originally Posted by black01_WS6
It seems the 400rwhp is the key where people actually gain power from a cutout. Our catbacks can be restrictive to a certain point, but with bolt ons it really isn't all that restrictive.
oh, and I hate you for dyno'ing higher than me with +/- same mods.
03-06-2007, 07:47 PM
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Originally Posted by camscam02
3 tenths and 2 mph on back to back runs with the flowmaster! i was so suprised! same 60 as well! it was wierd! the low end felt better with some added torque but it just didnt pull up top as much!
03-08-2007, 09:21 PM
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With my bolt on only car I have cutouts right after the headers. I lost .2 in the 1/4 and 1 mph. With comparable 60' times on back to back runs. I'm hoping with the cam in the car it'll pick up power, but I'm skeptical
