Downpipe Question

[Boise Talon]

I'm currently trying to upgrade my motor to stage one, and I was wondering if I could use a 2.5 inch downpipe for a 2g on my 1g Talon. I've searched, but I coulding find anything.

 

[95blackGsTurbo]

With some modification it can fit but I would just get a 1g downpipe so you don't have to mess with it. You can find them for under $120.00 on eBay if you don't want to buy one from one of our fine vendors.

 

[90gst_sean]

I agree with the above statement. Don't waist the $ on something that will just turn out to be a head ache. Unless your getting it for free i don't think I mess with it.

Go 3" and be done. There is no back pressure issues like with NON- turbo so 3" will only do good things for you DSM.

Your going to blow through to stage 2 and even 3 in no time so start to think ahead now; save your self a load of cash!!!!

If your going to fab or have fab'ed a cat back exhaust set up then that will help your attempt to use this 2G down pipe. Other wise, there may be issues with the bolt up and even the actual fitment through the engine bay. Keep in mind it may not even be possible. AWD and FWD can come into play as well.

If your super stressed for cash and 2.5" exhaust is your choice to save money; you can save a little going for the full 2.5" but not much ($50-$200)
I doubt this will work with that 2G pipe but HERE are some deals on cat back 2.5"s from the home page.

 

[Locke]

Go 3" and be done. There is no back pressure issues like with NON- turbo so 3" will only do good things for you DSM.

http://www.dsmtuners.com/forums/showthread.php?t=168578

 

[90gst_sean]

Im no N/A and definitely not an expert; there for have no interest in seeing who can piss the farthest, as I'd no doubt lose. That said, I thought I understood back pressure to play a role in modern four cylinder engines today. Fuel consumption, smog regulation, taken into account; the factory performance engine; i.e. Honda/Acura V-tec engines rely on specific exhaust back pressure to maintain a performance maximum within the limits imposed by today's stringent automotive standards; be it environmental or manufacturer based. With particular attention to low end torque performance.

But, like I said; I have little (nothing I could quote) research to stand on. just my perceived understanding of typical modern import engines.
...And I've been wrong before. So if you'll excuse me; I now have some reading to do.

 

[Street_Killer]

I dont really no what you are saying there... But back pressure is irrelevant with turboed cars. The most effiecient way to run it would be to run no o2, but that would burn things up.

 

[90gst_sean]

link

 

[nate97GSX]

Personally, I'd stick with a 1g pipe 3''. Bigger the better, get that exhaust out!

 

[Cs4g63]

90gst_sean- I also am not trying to get into a pissing contest with you but in the link you posted it states that it is better to not have backpressure on a turbo vehicle. You are correct in that a NA engine needs backpressure, but that is definately not the case for a turbo engine.
If I am reading whats on the link correctly it also states that bigger is better for the exhaust on turbo cars. It states that downstream from the turbo you want the least backpressure possible.

Quote from the link.
Downstream of the turbine (aka the turboback exhaust), you want the least backpressure possible. No ifs, ands, or buts. Stick a Hoover on the tailpipe if you can. The general rule of "larger is better" (to the point of diminishing returns) of turboback exhausts is valid. Here, the idea is to minimize the pressure downstream of the turbine in order to make the most effective use of the pressure that is being generated upstream of the turbine. Remember, a turbine operates via a pressure ratio. For a given turbine inlet pressure, you will get the highest pressure ratio across the turbine when you have the lowest possible discharge pressure. This means the turbine is able to do the most amount of work possible (i.e. drive the compressor and make boost) with the available inlet pressure.

 

[gsxeclipse97]

Thats why most down pipes have a 2.5 section before going into a 3" long as your within certain kinds of turbos..