We Need To Extract More Power

[Sledge]

In all the N/A applications where I have fitted extractors the power gains were only in the order of 5 odd kW, but performance was gained in faster peaking and flatter torque curves. For most turbo applications again peak power is only maginally affected (10 odd kW) when boost is kept the same. But usually a free flowing exhaust will allow slightly higher boost pressures dues to faster turine speeds. This coupled with the increased spool speed and flatter torque curve make for much happier driving.

[skyla]

Just reading this intresting thread, I too am looking at ways to get more power out my GTS25 and getting the best bang for my bucks. I found a thread on the SDU forums, that may help answer a few questions. I hope you find it of some use.

NA Power

Cheers

Rach

[sewid]

If anyone is interested I have an almost new 2.5" cat flanged for an R33 Skyline which i pulled off my own exhaust when i fitted a 3" cat. Im in Sydney. PM me for more info.

It's a Catco brand cat.

[Sledge]

If your interested in maximum bang for buck then have a look at this http://forums.vwvortex.com/zerothread?id=776885

How ever if your intending to keep your car drivable, then what we've discussed so far are the best options.

1st: make the car breath easier; fit free flowing filters and duct maximum velocity/vulume air at minimum temperature at it. Fit a free flowing exhaust system that has suitable backpressure for the engine type and modifications. (N/A cars need exhaust back pressure for optimum cylinder fill).

2nd: Fuel and ignition systems; Factory setups are always on the rich side to give better life span. Fitting piggy-back computer or replacement ECU's will yield fantastic results when tuned properly.

3rd: Component modification; I suggest starting with the head and examine porting sizes, shapes and their match to manifolds. The cam is also a good source of more power. From there look at your deck and head mating surfaces for more compression. Next is the inlet manifold which can always do with some tweaking.

4th: Component replacement; once at this stage you probably need to look at stronger rods, domed pistons, a new inlet manifold, larger throttle bodies and even bigger valves.

5th: Sell your house and go nuts!!!!

But remember the old saying:

Performance costs money, so how much do you want to spend?