Project: R32 GTR Daily Driver with Guts! Mods?

[ecenshu]

There are several articles on autospeed that show stock airboxes being more efficient due to size, shape and positioning. Shape of an airbox plays a rather large role in its flow capabilities. Also manufacturers spend plenty of $ in R&D to come up with an optimum design, then we just lop it off? There has to be a tradeoff to any modification we do and with the airbox I think that would be hotter air due to inefficient separation from engine heat and sometimes less flow in total.

Is more air better? Of course yes!

Is more HOT air better? answer is questionable.

How does a lot of hot air compared to a 15% less volume of air but 10 degrees cooler air compare in regards to performance? Just something I like to remind myself when doing intake mods.

[rev210]

A brand new paper factory replacement airfilter flows enough, however it blocks up fairly quickly and drops flow. A K&N style panel will retain excellent flow even when pretty dirty.

The real power difference between factory and aftermarket is actually bugger all. It always makes me laugh how much people pay for pods sometimes, thinking they are getting so much more power. Try 2 to 4 hp at the motor ---- oooh aaaah it really pushes you back in the seat!

[Sydneykid]

A brand new paper factory replacement airfilter flows enough, however it blocks up fairly quickly and drops flow. A K&N style panel will retain excellent flow even when pretty dirty.

The real power difference between factory and aftermarket is actually bugger all. It always makes me laugh how much people pay for pods sometimes, thinking they are getting so much more power. Try 2 to 4 hp at the motor ---- oooh aaaah it really pushes you back in the seat!

I am with Rev, the most I have seen is 6 rwkw and that was for a POD with good shielding and a substantial ambient air feed. The Pipercross panel filter on the same car in the standard airbox made 4 rwkw. That's a shoot load more work for 2 rwkw. And then there is the legal issue, the panel filter is going to be a lot less suspect.

I prefer the Pipercross style with 3 layers of different density foam that are ultrasonically welded (no glue to restrict the flow). They last 3 times longer between cleaning than any single density style. In the Sydney dust and soot we see deterioration after 5,000 ks' in single density filters regardless of brand.

Hope that helps