Any point to headers with a rear-mount turbo?
Any point to headers with a rear-mount turbo? I know with a traditional turbocharger, you want the hot-side exhaust as hot as possible to speed gases through the turbine. Thus, people avoid switching from the stock manifolds to long tubes. I notice a lot of searching turning up people using the STS turbo systems with long tubes though, and I'm curious if you want smoother flow vs. hot for these, since you're already feeding cooler air through it.
Is it a wasted mod? Is it a BAD mod?
Is it a wasted mod? Is it a BAD mod?
No necessarily. Velocity is also a result of air flow. Larger diameter long tube headers will flow much beater than stock or short headers. Plus having the headers coated will help keep the heat from dissipating.
see, this is what I was thinking and expecting. The question is, do you gain more from the flow, or lose more from the heat?
This is a topic of huge debate that has been revisited many times, and some recently on this 1st page.
The Real deal on STS and headers
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Verdad Gallardo True, but then you're talking custom design and big $, just to take a thin-walled, heat-bleeding, high-volume design and bottleneck it into behaving like something you get on the car for free that maintains heat better off the bat. If there's something I've found about rear-mount guys, it's that they like to go fast for less. Less fabrication, less underhood clutter, less out of pocket if they're having it installed, etc. Most are extremely budget conscious, and this drives a lot of the decision-making rationale. One of the things I liked was being able to hock my LT's and cat-back to recoup some of the cost of the turbo kit. 
I mean no disrespect, I just enjoy this particular debate because I have been all over it on my own car.
I mean no disrespect, I just enjoy this particular debate because I have been all over it on my own car.
Doesn't matter - I've decided on a supercharger for other reasons. Twas a good thing to know though! Thanks!
Someone needs to bring PhillyLS1 into this talk to find the real deal on the sts. STS guy search phillyls1 under user's and pm him for personal knowledge there is few better. Also Zombie, he is really good also. Best on the site IMO
Teching In
Joined: Mar 2007
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headers On my Subaru WRX the up-pipe to the turbo is maybe a 2in pipe which is cast iron. The downpipe opens up to 4 in right off the turbo and tapers to 3 in once it clears the firewall. I would would say keeping the heat and velocity up pre turbo is very important for the best performance so seems that the cast manifolds would be best.
You'll hear the same thing from them that you're getting from me. I followed their leads...kicking and screaming the whole way.
I think you're confusing volume with velocity, and correct me if I am wrong. The larger tubes and collectors on LT headers will increase the volume exiting the heads, but velocity will suffer as a result of the larger internal diameter. (Think exhaling through a straw vs exhaling through an equal-length of the straw tube that is larger in diameter, like a paper towel tube.) Heat is the most important thing to a turbo, and too much heat is lost with a rear mount, ergo the heat-retaining, thick steel, cast manifolds; wrapping of the exhaust, the small diameter of the hot-side piping, and all the weird stuff everyone thinks is wrong. The volume aspect is made up on the cold side in air being crammed into the intake. I myself have been through all of this and changed my way of thinking as have some of the better recognized figures on here. Manifolds work, and they work with big power on remote mount systems.
This is a topic of huge debate that has been revisited many times, and some recently on this 1st page.
The Real deal on STS and headers
This is a topic of huge debate that has been revisited many times, and some recently on this 1st page.
The Real deal on STS and headers
Everyone stating to use cast iron stock headers to keep heat in are totally missing the point here. The turbo is in the rear..... any heat in the exhaust gases is going to be lost by the time it reaches the turbo. LT headers will help generate some velocity over stock/shorty headers. The heat of the exhaust gases is a totally minor point.
Everyone stating to use cast iron stock headers to keep heat in are totally missing the point here. The turbo is in the rear..... any heat in the exhaust gases is going to be lost by the time it reaches the turbo. LT headers will help generate some velocity over stock/shorty headers. The heat of the exhaust gases is a totally minor point.