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View Full Version : diameter of strait pipe ?



ExpLlclT
12-01-2005, 07:50 PM
ok heres my plan get rid of everything from cat back and then do a strait pipe to a magna flow muffler 14862 i need to no what the best pipe diameter is for a 2.8L ?


thanks

ExpLlclT
12-01-2005, 08:18 PM
any one done this ?? ....

94jedi
12-01-2005, 08:21 PM
you'll probably want a resonator so it doesn't sound like total shite. either 2.25 or 2.5 dia. on a n/a some back pressure is good. in fact it's needed to build tq. I don't know much about the 2.8's, maybe 2.5 is too big. I know my 88 mustang gt was perfectly happy with 2.25" pipes, of course there were 2 as opposed to one. Maybe somone w/ more 2.8 experience can comment.

ExpLlclT
12-01-2005, 08:26 PM
what ould it sound like without the resinator ?

ExpLlclT
12-01-2005, 08:33 PM
isn't a resinator basicly a mid muffler ?


EDIT: i was going to take that out for a throaty sound

BranCKY3
12-01-2005, 08:38 PM
I think it's pretty hard to make a 2.8 sound bad. I'd say 2.5" would be good.

ExpLlclT
12-01-2005, 08:40 PM
anyone have a 2.50 ?

petery11
12-01-2005, 09:22 PM
BranCKY3- what Test pipe are you running with your borla.

I have a borla and was looking at the ecode 2.5inch one?

How does your sound, droning, obnoxiously loud? how much earlier did you notice the turbo spool (if it did )

thanks

BranCKY3
12-01-2005, 09:51 PM
I have the ATP 3" one. It sounds nice, I posted some clips in an older thread and in explicit's other thread. No droning, not obnoxiously loud. My mom drove my car before and had no problems with it if that tells you anything. With the exhaust and testpipe the turbo spooled 200-300 rpm faster.

bitterchild
12-01-2005, 10:18 PM
don't compare turbo and na exhaust setups please. somebody is going to be sorely disappointed.

b00st
12-01-2005, 10:20 PM
Originally posted by BranCKY3
I have the ATP 3" one. It sounds nice, I posted some clips in an older thread and in explicit's other thread. No droning, not obnoxiously loud. My mom drove my car before and had no problems with it if that tells you anything. With the exhaust and testpipe the turbo spooled 200-300 rpm faster.

did you eliminate the CEL code problem with running the testpipe? if so what method? or are you just leaving the light on?
i really want to run the ATP testpipe but for emissions reasons i need to make that CEL disappear. i know there is a diode trick and sparkplug spacers or whatever....but it only seems to work about 50-50.

and after in depth reading and searching the only real HFC out there is the Milltek and soon...the new EVOMS one. but i can buy 6 test pipes for the price of one of those and i'm sure the testpipe would yield a little more gain.

BranCKY3
12-01-2005, 11:11 PM
I put one of the spark plug spacers in, didn't work. I just leave the light on but it doesn't bother me at all. Maybe I will try to fit another spacer in there eventually.

bitterchild
12-01-2005, 11:13 PM
plug the 2nd o2 bung and hang the secondary sensor near the manifold. No code :) and it couldn't be any easier.

BranCKY3
12-01-2005, 11:15 PM
For serious? Damn that sounds like something even I could do. I'll definately try that out. Any specific mounting tips so I dont melt anything?

BzeB5A4
12-01-2005, 11:16 PM
Hmm, I really want to get a Test Pipe and the CEL doesnt really bother me either, just don't want any problems with emmission testing. So How hard is it really to just swap the Cat back in when the time comes for emmision??

ExpLlclT
12-01-2005, 11:36 PM
Originally posted by bitterchild
don't compare turbo and na exhaust setups please. somebody is going to be sorely disappointed.

b00st
12-02-2005, 11:22 AM
Originally posted by BzeB5A4
Hmm, I really want to get a Test Pipe and the CEL doesnt really bother me either, just don't want any problems with emmission testing. So How hard is it really to just swap the Cat back in when the time comes for emmision??

the light wouldn't bother me either...but those bolts on the DP are a PITA and I hate trying to take it off. it really is a PITA.

b00st
12-02-2005, 11:27 AM
Originally posted by bitterchild
plug the 2nd o2 bung and hang the secondary sensor near the manifold. No code :) and it couldn't be any easier.

bitter,

so let me get this straight. you just plug the secondary O2 sensor up...strap that sensor somewhere and you won't get a code. And what about the first O2 sensor...that is hitting full stream....will that make a difference? Do you need to put a spacer on that one?

b00st
12-02-2005, 06:24 PM
bump,
for bitter to answer my question [:D]

94jedi
12-02-2005, 06:42 PM
Originally posted by b00st
bitter,

so let me get this straight. you just plug the secondary O2 sensor up...strap that sensor somewhere and you won't get a code. And what about the first O2 sensor...that is hitting full stream....will that make a difference? Do you need to put a spacer on that one?

yeah, basically you're warming the sensor up. It just needs to heat up sufficiently and since it won't be in the exhaust stream it won't throw a code. He told me to do the same thing but I kinda like the CEL[eek]

bitterchild
12-02-2005, 07:00 PM
no, you didn't have a plug or a wideband o2 sensor to replace the secondary with :p

boost, try hanging it off the pipe above the manifold so the sensor gets hot. doesn't really make much of a difference.

b00st
12-02-2005, 07:57 PM
no wideband here.

i will get a testpipe then and give it a whirl see what happens. don't you need to protect the sensor from dirt and such? not that exhaust is any better...but i dont want to ruin the sensor..especially if i don't get it to work right and i drive with a CEL until close to emissions and swap back the stock cat.

offroader1006
12-02-2005, 09:26 PM
i thought all 98.5 and up were wideband?

bitterchild
12-02-2005, 09:55 PM
as far as I know no b5s have onboard widebands. I know b6s do. It is possible dbw's do but I doubt it.

hoonee46
12-13-2005, 01:04 PM
Don't understand why people are so worried about emissions... Of course, different states have different laws.... but... I'm willing to spend $70 to get a sticker every few years ^^;; Test pipes as soon as I have cash for it!!!! Oh, and the CEL.... if you have a laptop, just get a vag cable and software.. so in case you throw a different code other than the O2 sensor, you'll know...
That's what I'm planning anyways... Good luck to all, and if anyone has used test pipes, throw me a PM...

b00st
12-13-2005, 01:12 PM
thats cuz in IL emissions is a pain in the ass. so i need options...i want a test pipe and i think i will try it via sparkplug non foulers/spacers...whatever you want to call it.

BzeB5A4
12-13-2005, 01:20 PM
I've never been to emissions here in ILL, what kinda inspection do they do?

Also, how long does it usually take to get a notice of some type to go do emissions testing for a newly purchased used car from another state??
As soon as I get the testing im planning to throw in a test pipe, cuz i heard its only every 2 years.