wil it loose power? i have t2.does itreallyhave to have back pressure in teh exhaust system? im thinking of trying 3 inch straight pipe instead of the muffler tip in the end.

 

So your thinking of running a dump instead of the cats and mufflers?

It will be too loud for some race tracks, let alone a street car. Who cares about peak power if it's too loud to think. You'll know what it means to bleed from the ears...

 

straight pipe.
But to answer your question, no you don't need back pressure with a turbo. Your boost levels are going to go up. And the value of everyone elses car will go down. Be careful.

 

just run an open atmosphere wastegate. you get the ungodly sound without getting arrested while cruising

 

with a turbo the less back pressure the better back pressure will only limit your turbo and possibly cause future damage the only problem with strait pipes is that they are incredibly loud on rotaries and the sound disgusting

 

hmmm sounds good, loud is good. I was running [cherry bomb]glass pipe and it was loud already, but I need louder. Im going for the bosozoku style exhaust

 

well yes loudness is an issue...im currently running straight pipe on my t2...but am now cruising around with my silencer in....careful on straight piping it tho....you will have overboosting problems and run into fuel cut..make sure u get a boost controller and a fuel cut defensor if u plan on running like that....also...wen u up the boost...pay careful attention in upgrading ur fuel system...

 

^ what he said

and screw the other guys, straight pipes FTMFW!!!!

 

First of all, boost controllers CAN NOT turn down boost nor will they prevent boost creep. If you run a wide open exhaust on a turbo, your boost will raise up. You need to get an FCD, port the wastegate, and get a fuel controller to add more fuel. Otherwise you will blow your motor.

 

How is this supposed to help with his question? An atmospheric wastegate will cause you to loose more boost between shifts than a recirculated one, So I personally would stick with the recirculated setup. But I've never heard of an atmospheric wastegate taking the place of a Straight Pipe exhaust...

Loud is good but too loud is just too loud... and be careful running that cherrybomb, you'll end up melting the fiberglass out of it...

I'd be wary of getting a Fuel cut defender, especially if you're going to raise the amount of fuel you'd burn, you could end up blowing your engine REAL quick. Just get a good, Programmable Engine Management System.

They can't "Turn Down" boost but they can cut it off. If you don't have one already, you'll probably need a boost controller if you don't want your turbo to explode lol...

 

Wait... What? the point of programmed fuel cut is to keep from overboosting and leaning out thus blowing your motor. The FCD is to trick the ecu to keep from hitting fuel cut, NEEDING more fuel not to lean out and blow up. You need more fuel when running a FCD. Id be weary of running an fcd WITHOUT additional fuel.

edit: oh wait you said increased BURNING, AKA consumption, meaning you would be correct sir. you threw me off, when you said weary of raising fuel... i should have read it completely.

 

No you were right, it still doesn't make sense. You couldn't add any fuel without a FCD.... it would just cut out at fuel cut. He obviously already has one or is running some type of management, otherwise he COUDLNT boost at 19 psi!

 

hmm....wierd....i turned my boost up to a modest 10lbs using an agency power mbc...and it stops right at 10lbs....you are right tho...bc's do not turn down boost....they can only "turn up" the boost....

dkwasher.....heres my setup to use as a reference....since i went straight pipe i had to definitely upgrade my fuel system to prevent leaning out

fcd
agency power mbc
apexi afc neo (dyno tuned)
walbro 255lph fuel pump
rc engineering 550cc primaries
greddy/denso 720cc secondaries

just the fuel setup alone cost me around $900....not including dyno tuning (which was free for me from a friend)....just some things to think about if you go that route...

 

It has been my experience that about a quarter of the people that run a Fuel Cut Defender end up revving their motor WAYYYYY too high and blowing all to high heaven.

I personally would rather drop a lot of money SOONER on a nice Programmable EMS than have to pay a lot MORE money LATER on a new car/motor/body part.


And you CAN add more fuel and not have a FCD, the basis of a Fuel Cutoff is RPM's, not actual volume of fuel.

 

if u really want a loud exhaust get the corksport 3in exhuast all the way back with 3in down pipe (any brand) and that exhuast is too loud adds power but too loud.. but if you don't mind go for it. i have one if you want to buy it.... i took it off cuz unbarebly loud.

 

i have a 3 in on my fd to a apexi tip and it is ungodly loud and i hate it i would definatly not do it if you would dd your car.

 

okay ive done it. 3inch straight pipe all tehway.. fuckkenn loudass hell... turbo spools instantly. the problem is not enough fuel.. I have a fbcd, and boost controler, and fuel pump. But i need more fuel still it bogs at 6 k ....

 

What other mods do you have? You might need some higher cc injectors... Or an aftermarket EMS like I said before...

 

hate to say it...but...told u so.....

 

well its been day 2, I havent got pulled over yet lol.. I am turning deaf though. At least I look cool! haha yeah I need to upgrade the fuel system.. When it hits 10 pounds of boost, and shift up from 3rd to 4th it bogs, Its not enough fuel.. so I will try to upgrade teh fuel system..

This is gunna be badass, when I enter the next drift event muahhahaha

 

I wasnt saying that fuel cut is based on the volume of fuel, I was talking about the fuel cut that is based off of BOOST.... the stock ECU WILL NOT allow you to go above 8-9 lbs of boost before it.....cuts the fuel. THAT is why I said he's got an FCD, pushing 19psi. won't happen without a FCD.....

while a lot of us would love to put down money for a nice haltech, or wolf, or microtech, but the vast majority of us broke FC owners would sooner just by a S-AFC, an FCD, and a boost controller and be perfectly happy until we decide to go big.

 

Well no joke you need more fuel! At least get some 720's for the secondaries, but even then you are going to need a way to control it!
Have fun blowing your motor at the next drift event!

 

mine is the na.... and I went single straight 2.25 from the down pipe back to a 3in universal tip. it sounds great! it gets loud at high rpms of course... but you most likely went full 3 inch right?

 

There is no reason to have a loud exhaust on a turbo car. A properly designed exhaust will be very tolerable and far from "loud". For example the RB "Rev" system is only a bit louder then stock at light loads and will support 400+ RWHP.

Boost controllers cannot lower boost past what the wastegate will naturally achieve.

Uh, you mean "BOV" and not "wastegate". Venting the BOV to the atmosphere should not effect boost response if done correctly and the valve is not too loose.

Venting the wastegate to the atmosphere will actually make it easier for most people to control boost, since most people don't seem to know how to properly tie a wastegate dump into a downpipe without it becoming a restriction.

They can't keep the boost low if the wastegate is too small. Which if we are talking about an S4, it certainly is.

 

OH! Wow... I can't believe I did that, I completely turned everything around in that post...

YIKES!!! Sorry guys... Disregard that apparently drunken post!