What is recommended next upgrade step?
06-11-2012, 11:49 AM
#51
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o also the soundwaves produced from the exhaust can attribute to poor performance. they can prevent the exhaust gases fro exiting correctly and efficiently so muffler choice is very important specialy when dealing with under 500hp cars. other wise run no muff all together.
suck it davey crocket your horse aint got **** on my cobalt biaatch
suck it davey crocket your horse aint got **** on my cobalt biaatch
06-12-2012, 01:27 AM
#52
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o also the soundwaves produced from the exhaust can attribute to poor performance. they can prevent the exhaust gases fro exiting correctly and efficiently so muffler choice is very important specialy when dealing with under 500hp cars. other wise run no muff all together.
suck it davey crocket your horse aint got **** on my cobalt biaatch
suck it davey crocket your horse aint got **** on my cobalt biaatch
06-21-2012, 12:31 AM
#53
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Well I'm no expert, and I'm sure you all know more than me. But, i do know a guy, going to college to be a NASCAR performance tech or some ****, that backpressure, is crap, bigger the better as long as u calibrated the tune for it. I'm no expert, by any means, just repeating information
06-21-2012, 02:07 PM
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in the sport that's name we shall not mention lol they are makeing what, 800 horse roughly, when you start makeing that much power its a different ball game. he is correct but we r dealing with a different setup, different systems, and i should clarify my earlier statement, by saying that back pressure should always be taken into consideration but there is many different variables and setups depending on what you have and are working with.
06-21-2012, 02:09 PM
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ive seen cars at the strip with open headers running the same times and makeing the same horsepower as cars with full exhausts, different size exhausts, different lengths, so many different things you can do but lets stick to cobalts and their setups lol =-P
06-21-2012, 09:36 PM
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ok, so someone explain this too me, where would you see a gain with a 2.5 compared to a 3" exhaust. are you looking at a gain in hp? a gain in tq? a gain in your upper or lower power band? I really have no clue, and why? I am curious mostly because i have a 3 (catted), and for what i have I'm pretty high up on the totem pole on m62 power, im just curious, cuz i have no clue
06-22-2012, 11:56 AM
#60
dang it! I hate it when I can't let go!
you did give the OP the correct info.
except for the bit about backpressure
the 2.5 offers the right amount of volume and velocity for that combo. The 3" has too much volume, not enough velocity for that combo, and installing it will cause a loss in power. On that we agree
Lack of velocity of exiting gasses does not create an adequate negative pressure area at the open exhaust valve to completely evacuate the chamber, resulting in residual spent gas left over in the chamber--backpressure. So, again, why would you want that?
you did give the OP the correct info.
except for the bit about backpressure
the 2.5 offers the right amount of volume and velocity for that combo. The 3" has too much volume, not enough velocity for that combo, and installing it will cause a loss in power. On that we agree
Lack of velocity of exiting gasses does not create an adequate negative pressure area at the open exhaust valve to completely evacuate the chamber, resulting in residual spent gas left over in the chamber--backpressure. So, again, why would you want that?
People way overthink exhaust setups. I put down 298 when I was on a stock 2.25" catback, 3" h/dp, and ran the stock 3.15" TVS pulley. For what its worth, a year later I unbolted my catback leaving the 3" header/dp open, ran a 3" pulley, 2* less timing, and put down 303whp. IMO the shitty catback didn't hurt much.
06-22-2012, 01:30 PM
#61
Another person who understands the principles behind exhaust flow and scavenging.
People way overthink exhaust setups. I put down 298 when I was on a stock 2.25" catback, 3" h/dp, and ran the stock 3.15" TVS pulley. For what its worth, a year later I unbolted my catback leaving the 3" header/dp open, ran a 3" pulley, 2* less timing, and put down 303whp. IMO the shitty catback didn't hurt much.
People way overthink exhaust setups. I put down 298 when I was on a stock 2.25" catback, 3" h/dp, and ran the stock 3.15" TVS pulley. For what its worth, a year later I unbolted my catback leaving the 3" header/dp open, ran a 3" pulley, 2* less timing, and put down 303whp. IMO the shitty catback didn't hurt much.
That's why I run a full 2.5" free flow exhaust.
I have the best of both worlds.... Flow & velocity
06-27-2012, 10:08 PM
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Ok, so I just got back from the trip to ZZP and now have stage 3 and 3" dp installed. The question is what to do next? I got a IC pump, 3 gauge pillar and aeroforce scan gauge to buy first and a vacation. BUT once I can start getting the funds. Should I go LS4 TB and 3" catback, or wait till next spring and get a tvs blower?
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