scottyMIz Posted July 4, 2001 Share Posted July 4, 2001 Well i did it and was wondering if it would be too restrictive.It seems to run fine but i've never owned a turbo car before.It's y'ed off from the down pipe to the twice pipes sounds great at low rpm and at high it sounds really quiet.I was just wondering if the pipes on them are big enough and if i'm going to affect the performance with the two pipes? Quote Link to comment Share on other sites More sharing options...
Drax240z Posted July 4, 2001 Share Posted July 4, 2001 Its all about cross sectional area. Twice pipes will work fine, but you need to know the cross sectional area to compare to a single pipe. There are posts here somewhere about pipe diameters etc. Try a search. Quote Link to comment Share on other sites More sharing options...
scottyMIz Posted July 6, 2001 Author Share Posted July 6, 2001 Drax what do you mean by cross sectional area? sorry i'm new at this but i learn quickly. Quote Link to comment Share on other sites More sharing options...
Drax240z Posted July 7, 2001 Share Posted July 7, 2001 The area of a circle is equal to Pi*radius^2. For this lesson we'll ignore the surface friction on the pipe walls. Basically having 2 2" pipes, are going to yield 2*3.1415*(1)^2 or 6.283in^2 cross sectional area. Having 1 2.5" pipe will yield 1*3.1415*(1.25)^2 or 4.908in^2 cross sectional area. Of course there is flow loss due to surface friction, and you will see more flow loss with 2 pipes than with 1. (it depends on circumference basically) Quote Link to comment Share on other sites More sharing options...
scottyMIz Posted July 8, 2001 Author Share Posted July 8, 2001 thanks drax it's nice to talk with others who have done this before. Quote Link to comment Share on other sites More sharing options...
scottyMIz Posted July 8, 2001 Author Share Posted July 8, 2001 ohhhhhhh i see thanks for the math lesson.So i'd be better off with one pipe due to more surface loss on the two pipe's surface.I have a splitter that probibly doesn't flow too good either. Quote Link to comment Share on other sites More sharing options...
Drax240z Posted July 8, 2001 Share Posted July 8, 2001 Well 'better' is a relative term. You'll be quieter with 2 pipes as opposed to 1 large one. As long as you plan on the slightly less flow you could run 2 pipes without a problem, just size accordingly. Also, it can be a heck of a lot easier to have good ground clearance when running 2 smaller diameter pipes as opposed to one large one. Lots to think about, but at least you'll be able to make an educated decision yourself. Quote Link to comment Share on other sites More sharing options...
Drax240z Posted July 8, 2001 Share Posted July 8, 2001 Done what before? I'm just spilling a little of what I know of fluid dynamics. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted July 8, 2001 Share Posted July 8, 2001 Well scottie... Honestly dude, if you are losing horsepower. Who cares. I did a full 3" dp all the way back to a dynomax race magnum. The resonance in the car is ungodly. If you like the sound, dont change it. My exhaust is loud enough where im almost irritated by it Anyway, sounds like a winner to me! Just make sure your not chokin the motor THAT bad. What size pipes are in twice pipes? Evan Quote Link to comment Share on other sites More sharing options...
Guest Tom Scala Posted July 8, 2001 Share Posted July 8, 2001 Evan,did you use the round race magnum or the oval one? I imagine the oval muff would be quieter due to it's larger case size. When (if) I go to a 3" system I may just use the 3" Super Turbo since I don't want too much noise either. They flow pretty well and are quieter than the straight through type. My friend only gained .5 MPH and no ET going from the 3" Super Turbos to the straight through 3" Race Magnums on his mid 11 sec 4100 lb. Pontiac LeMans. How bad can they be? Quote Link to comment Share on other sites More sharing options...
scottyMIz Posted July 8, 2001 Author Share Posted July 8, 2001 drax i ment the turbo thing you've been into it far longer than i have and it's nice to hear from you and scottie gnz and all the others.Evan i think they are two inch.And it sounds great it has a great deep tone and as you speed up the engine it gets quieter it just sounds good and mean.I don't think it's choking the engine at all it seems to have alot of power but i don't have a good running z to compare it to either.I just love driving it we went for a ride to grand rapids here in MI to see bumble zee and meet him and hang out and it ran great oil pressure was about70 psi all the way there cruising about 80 all the way there it was nice to have power in 5th gear and not have to down shift to pass on the free way and if i did down shift hold on cuz it was like a rocket.I can't wait til i can run her at the drag way. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted July 8, 2001 Share Posted July 8, 2001 The muffler is NOT the oval shaped one. i may end up using an oval muffler sooner then later. Its pretty loud. Ill see how long i can stand it. Ideally, if there were space (of course not) I would place another race magnum right after the DP to dump some resonance. Works great with my n/a setup. Dual 2" equates to roughly a 2.5" pipe if i remember correctly. That should be perfectly fine. Scottie, i made a balls out run with my buddy to get a borg warner T5 from grand rapids. Drove there, turned around and drove straight home. A friggin duck flew into my windsheild at like 11pm! lol Evan Quote Link to comment Share on other sites More sharing options...
Modern Motorsports Ltd Posted July 9, 2001 Share Posted July 9, 2001 quote: Originally posted by Drax240z: Well 'better' is a relative term. You'll be quieter with 2 pipes as opposed to 1 large one. As long as you plan on the slightly less flow you could run 2 pipes without a problem, just size accordingly. Also, it can be a heck of a lot easier to have good ground clearance when running 2 smaller diameter pipes as opposed to one large one. yeah, I'm still looking for HSS 2x4 in galvanized aluminum cheap it'll clear easy and provide enough area single 3" has 7.1" area dual 2.5" has 9.8" area and 2x4 has 8" area assuming those are actual dimensions which we know they'll vary Quote Link to comment Share on other sites More sharing options...
scottyMIz Posted July 9, 2001 Author Share Posted July 9, 2001 it runs raelly good now and we just got back from grand rapids it was a 3 and a half hour drive we went to meet bumble zee it was fun there are alot of rice cars there but most where tastefully done.Read my fixed the problem post you'll find out why it runs better.Thanks for the help guys Quote Link to comment Share on other sites More sharing options...
TimZ Posted July 9, 2001 Share Posted July 9, 2001 quote: Originally posted by Evan Purple240zt: The muffler is NOT the oval shaped one. Yeah, the bullet race magnum muffler does pretty much nothing, as far a noise reduction goes. The oval race magnum is much, much quieter (although still pretty loud). Quote Link to comment Share on other sites More sharing options...
Ron240zxt Posted July 22, 2001 Share Posted July 22, 2001 Hey Evan you said its really loud the exhaust and everything. Im assuming you are still running open wastegate. Quote Link to comment Share on other sites More sharing options...
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