cat back vs turbo back & o2 eliminator?

[diputz42]

what are the differences/benefits/trade-offs between a cat back exhaust and a turbo back exhaust?

and what is the benefit of getting a system with an o2 eliminator downpipe?

thanks.

 

[Laser93Nash]

O2 eliminator turbo backs are the best IMO.

Cat backs are good too. But if you get a 3” cat back some get smaller at the cat. Same with a down pipe. Some get smaller at the o2 housing to bolt up to a stock one and smaller at the cat to attach to the stock cat.

Turbo backs are great too. They bolt up to the stock o2 housing. If you have a 1g you might want to upgrade to a ported 2g o2 housing or evoIII o2 housing.

An o2 eliminator turbo back is the best IMO. It replaces the stock cast o2 housing with a larger tubular housing and attaches to a down pipe without getting smaller. Essentially the turbo back is the best. You can get a o2 eliminator turbo back from rnrracing.com for under $800 Depending on what your looking for. . .

I think that’s most of it. .

Oh yeah. . If you don’t want boost creep with a 3” exhaust get the o2 eliminator with the external dump. .

I’m done. . . I gotta get back to working on my school homework and sh!t. . .

~Andrew~

P.S. This was posted from my Multi media art class in Bettendorf High School.

CHEERS!!

 

[diputz42]

haha youre 15 and already have ur own car? hope mommy and daddy didnt pick it up for you. if not, very nice.

so now what are the differences between turbo and cat back? from what i can pick up, the turbo back does away with the cat convert and is basically a test pipe? or IS it a test pipe?

and what do you mean external dump? what is the diff between internal and external dump? does rnr have one with an external dump? and wth is boost creep? ive been looking at the rnr one and im planning on getting that in the near future.

thanks again.

 

[turbolarry]

Keep in mind turbo back, O2 eliminators, and external dumps are not smog legal in CA... but the more you do the better your car will perform. If you do go all out, keep your stock stuff for the smog test, stay out of high profile places, and try not not to draw attention to yourself when your driving. Are you at UCR now?

 

[diputz42]

i wont be at UCR until the 18th. 10 days!!!

i'll keep that in mind... but what is an external dump? i'll do another search on it, but i can't surf/search too much cuz im at work

 

[turbolarry]

Turbo back is just that, replaces everything from the turbo back with larger diameter piping. You can choose between, a long down pipe with no cat, high flow cat, or a test pipe, which you can swap a cat in and out. Cat-back is after your stock cat. External dump expells wastegate exhaust straight to the air and not back into the exhaust. Boost creep is basically when wastegate exhaust is unable to to flow enough and your boost continues to go up.

 

[diputz42]

so let me get this straight.

turbo backs replace everything from the turbo down. so a full turboback exhaust system should replace o2 housing, dp, straight pipe and muffler and should omit a cat convertor

cat backs replace everthing from the cat convertor down. so a catback exhaust system would only replace cat convertor, straight pipe, and muffler

did i get that right?

and lets say i went to rnrracing.com and bought the o2 eliminator turbo back with an external dump (right now only $625!!!). do i need to add the "external waste gate flange welded on" for $30? and what extra installation steps are needed to install a turboback with the external dump?

 

[1fast4]

A cat back does not replace your catalytic converter, it relaces everything after it(pipe and muffler). I dont know if a turbo back comes with a new O2 housing, if it does it should say in the description of the item.

 

[saw wave analog]

you dont need an external wastegate flange (to mount an external wastegate onto) unless you are running a bigass turbo.

 

[diputz42]

without an external wastegate flange, can you still have an external dump? how does all that ish work?

whats your def. of big ass turbo? like 20g? t3/t4?

 

[saw wave analog]

you can have an internally gated turbo that dumps externally, the difference between internal dump and external dump is just whether or not the wastegates outlet runs back into your exhaust (internal dump) or straight out of the turbo into open engine bay air (external dump.. illegal, loud, smells like shit and not really necessary on a 16g level turbo)

a 20g or t3/4 both qualify as bigass turbos in my book, externally gating them or anything bigger is a good idea.

 

[marin_2k2]

A little off subject but do the rnr o2 eliminators w/out cat come with the o2 sensor bungs?

 

[diputz42]

A little off subject but do the rnr o2 eliminators w/out cat come with the o2 sensor bungs?

i believe they do because you need the o2 sensor. i think i read a post that confirmed that as well.

okay so all this internal/external ish is confusing the hell out of me. so i understand the difference between internal and external dumping. but what is the difference between internally and externally gated? the differences in the ways internal and external wastegates work?

 

[fat pat]

an o2 eliminatr downpipe will come with an o2 bung. Without an 02 sensor, your car wouldnt be able to adjust to a rich/lean fuel mixture, and you could do potentially hug damage to your motor. o2 eliminator means it just replaces the o2 housing with a tube attatched directly to the downpipe. internally or external wastegate just depends on the turbo. some turbos are internally gated (14b, t25) the wastegate is built into the turbine side of the turbo. externally gated turbos have wastegates attached to the 02 housing or the exhaust manifold.

both external and interal wastegates can be dumped internally, or externally

 

[diputz42]

okay so heres another one. which would flow better? a 3" o2 elimin turboback exhaust or a 3" turboback exhaust + EVO III o2 housing?

 

[Eclipse96Ryder]

3" o2 eliminator from rnr racing is the best exhaust period. its soooo nice and its 3" all the way through with no neck downs or ne thing like that. the downpipe eliminates the cat and its just one big piece...

the o2 eliminator, downpipe, and straight pipe are all one long pipe...its really nice...then the catback is one piece also...2 pieces total in my turbo back system

 

[fat pat]

a 3 inch o2 elim would flow better than a 3 inch and an evo III. the evo III is 2.5 inches at its widest. so in terms of raw flow, an o2 elim would be better.

however, for practical purposes...an evo III may be a more practical choice. it allows you to switch out the downpipe alot easier for emissions, or any type of car work. you also dont have to worry about your new dp hitting your oil filter.

it all depends on your power goals...your budget, and your willingness

 

[diputz42]

well luckily in california, we only have to get our cars smogged every other year. and since i just bought the car a few weeks ago, i gotta get it smogged now (bone stock). i might even end up selling before the 2 years

 

[marin_2k2]

you also dont have to worry about your new dp hitting your oil filter.

I think i read a post that said a newer evo oil filter can be used. It's wider and shorter and leaves room for a 3" downpipe. I'm just not sure which evo filter would be used. Does anyone know which exact filter it was?

 

[futrgsxonr]

Yeah I heard you can use the evo filter too. I'm pretty sure I saw a comparison picture of them both too but I don't remember what the thread was called or anything like that either. Sorry I couldn't be more helpful.

Later | "B"

 

[a_scobel]

I think i read a post that said a newer evo oil filter can be used. It's wider and shorter and leaves room for a 3" downpipe. I'm just not sure which evo filter would be used. Does anyone know which exact filter it was?

Hm since for some reason, Mitsu likes to make all Evo parts expensive, how much does the Evo filter cost as opposed to a 3kGT filter?? I'm about to get my 3" turbo-back this month and already ordered a 3kGT filter.

 

[jessebenner]

You can also use a forward-facing oil filter housing (off a 4G64, I think). It bolts right up. I bought one for the motor I'm building. Then there is no issue with the oil filter in the way. If you search, you could probably find more specifics.

 

[marin_2k2]

Hm since for some reason, Mitsu likes to make all Evo parts expensive, how much does the Evo filter cost as opposed to a 3kGT filter?? I'm about to get my 3" turbo-back this month and already ordered a 3kGT filter.

I don't know how much the filter for the evo is, but here is a post that talks about filter fitment.
http://www.dsmtuners.com/forums/showthread.php?t=138941&highlight=evo+oil+filter