Another header option for the TSX. This one eliminates the cat and bolts directly to the catback exhaust. Who wants to give it a try?

Weapon R header

 

That is funny that you mentioned this header since I just got done looking at it and was wondering if it was any good....

 

rmpage posted this in my race header thread a while back as to why they won't work for the TSX:

 

http://www.prostreetonline.com/sku/953-204-103.html

So u guys saying this race header wont fit the TSX at all? Why do they sell as an application for the tsx then?

 

Thanks man, but just to expand a little on that, LT headers will "work" with an otherwise stock TSX. They'll fit to the car, and since they flow better and eliminate the cat, they will probably produce a bit more power than stock. This may be enough for some people, and then there are others who buy stuff "because it's used on race cars".

To really take advantage of a LT header, we'll want more lift and duration on both intake and exhaust cams to allow increased flow rates. Thanks to i-VTEC, some of this can be had by lowering the VTEC point and tweaking VTC, but a more aggressive set of camshafts would probably be necessary to see the full benefits of a race header. We'd also need a tune to support all of this, and I need not say why that's a problem. In fact, even an otherwise stock TSX would probably run lean using a race header, due to the increased flow - the TSX uses a MAP sensor to determine proper AFR, and higher flow through the engine would decrease the MAP. This in turn causes the ECU to think less air is going into the engine, and inject less fuel when it should be adding more fuel. Cars with MAF sensors do not have this problem (for example the Civic Si uses a MAF and won't run lean with a race header).

Just for an example on the whole LT header/matching camshaft thing: On my GTO (pushrod MAF engine), I went from 335 to 377whp with LT headers, catless midpipes and a dyno tune. This was with an otherwise stock drivetrain. But when I added just a mild camshaft (lift/duration barely increased, but significantly more overlap) I jumped to 441whp. Moral of the story: a LT header needs cam to really shine.

 

^^ Wow, that's some serious power Rmpage! Dyno / Videos / Pics??? LOL

Also, do you think my SC setup would benefit from a Race header? Or do you think it won't add much?

 

441whp is the shiznit.

 

This is really a question that could probably be better answered by Doug, but I don't think you'd see much of a difference versus any of the "shorty" 4-2-1 headers (CT/DC/ebay) as a tunable NA engine would.

Less port backpressure is an axiomatically good thing, which becomes especially true on boosted engines. With the blower spinning for 5 psi, your 2.4L engine is moving as much air as a 3.2L engine at any given RPM, so an exhaust system designed for the TSX all of a sudden looks 30% smaller (and might exhibit that much more backpressure) when the engine is under boost. To this end, any combination of header, cat/test pipe, and free flowing exhaust will make a significant difference, moreso than it would on a NA engine.

The advantage LTs have over shorties is their increased scavenging ability - they can reflect the exhaust compressions backwards through the cylinders and into the intake manifold during overlap, where they echo back through to the exhaust again before the exhaust valve closes, pulling along some of the intake charge while they do. Without overlap, you don't get this result and the LT advantage is meaningless. The thing for you is that on a FI engine, you don't want any overlap because the supercharger is filling the cylinders with air that's above the pressure in the exhaust system (closer to ambient). If both sets of valves are open you just end up blowing some of that intake charge out the exhaust valve and that air/fuel never gets burned. So, because your only concern is simply reducing port backpressure, I'd think you're better off staying with what you have.

I don't have my dyno files on this computer (laptop) unfortunately, but I'm selling the LTs and cam soon, and getting a nice mild zero-overlap cam to go with this.

 

Damn... I'm going to bother you when I need advice.
Good info.

 

Thanks for clearing that up for me rmpage Very informative.

 

Anyone try this yet?