Advantages of Running 3" Piping from the Y pipe to the Muffler?

[Perry V]

I'm currently running 6lbs of boost through my powerdyne setup, i have the Rksport headers, and an Edelbrock catback system.
Next year i will be rebuilding the motor and cranking that boost up somewhere in the 12 psi range (with the gear driven powerdyne).... so i'm going to take my cat converter out soon.... i has just thinking, i don't know if my I pipe with the edelbrock catback is allready 3" but i was thinking of running 3"'s all the way from the y pipe to the muffler....
Will this help in sound? Power? What about the whole issue of back pressure? Is 3" too much do you think?

thanks for the help guys....
it is appreciated..

Perry V.
'97 Bird

[Patrick Javert]

this will be good b/c your car is sc'd and is gonna be putting more air through once you get that 12 lb. sc. if you don't have 3" already, get it before you get the 12 lb. pulley.

[imported_admin]

Any supercharged 3.8 should have 3" straight the entire way through. This is what solved my dipstick-shooting problem...

How were you planning on mounting the new Powerdyne? The same way your current Powerdyne is mounted? If so, serpentine belt slippage on the supercharger pulley will be a major problem... were you going to mount it differently to compensate?

[Perry V]

So there won't be any power loss for this summer if i go 3" all the way? Cause with the 6 lb setup i have right now, i don't want to loose any power or anything cause that would suck, but if there is no power loss, and i would be doing that anyways next year, then i'll go ahead and do it.

as for mounting the new charger....i have no idea of what i'm going to do, i might just try it out on the back of the belt and see what happens..... we should look into getting a custom 2 sided belt made long enough for the powerdynes....

thanks for the quick replies guys

PV

[Perry V]

My friend has a 89 GTA with the TPI Engine, and he says some of the ppl he talked to even told him that HE may even lose some backpressure and that 3" might not work great for him, and that's a big V8 he's got in there.
So does it make sense for me to do it? Will it sound good? will i lose any power?

thanks guys

Perry V.

[imported_admin]

<blockquote>quote:</font><hr>Originally posted by Perry V:
some of the ppl he talked to even told him<hr></blockquote>

Outdated rumor.

There is NO power loss on the 3.8 from running 3" exhaust. This has been dyno proven time and again (check gen tech forums). 3" exhaust offers considerably more power than 2.5" on the 3.8 NA, with forced induction the power gain is even more significant. If you're running a blower you're shooting yourself in the foot by using 2.5" exhaust...

[Perry V]

Hey thanks for the info, that makes me feel so much better....anyways....a couple of more questions about this 3" pipe.....

so its ok to put the 3" directly to y pipe that came with my rksport headers, and take that all the way to the edelbrock muffler? Is it ok even though my muffler has 2.5" outs (i think)?

also, i'm not sure, but i think i heard someone a while back talking about the sound getting riceyer with the 3" on the 3.8, and i also heard someone says it gets deeper....i dunno who to beleive....

so if I go and buy a 8 foot peice of 3" piping i should be ok then?

thanks a billion for your help.

PV

[Night Rider]

The exhuast note will become notably deeper with a larger I-pipe. It will sound meaner. Ask almost anyone here & they'll all agree on that. You should have no problem w/ your set-up.

[knowledgefreak]

a 3" exhaust will help with crank case blow bye and eventual rear main seal leaks.

Do you have a crank case breather? May want to put on a filter cap on your oil fill instead to help releave some pressure.

Yeah yeah some people will say bla bla you dont need to we have internal pvc

Whatever your running extra boost the engine was not designed for and the crank case has lots of extra heat now. You have to compensate for the blow by that will occur or you ill start seeing oil recirculating in your tb, then gets on your maf then you get bad maf readings then you have seal leaks and on and on and on.