Skunk2 BRZ Intake Results!

[Xero-Limit]

A customer wanted to get every last HP out of a car, and we of course are more than happy to do what it takes. While some of the intakes have a large MAF housing, they require pinching of the primary tube to get past the smaller OEM bulkhead, or reuse the OEM snorkel that necks down to 2.5". None of those are valid options in our book. However, Skunk2 aka Kraftwerks/Grams/Group A, have released their intake which addresses many of those issues. Bigger snorkel, filter, and most importantly, a HUGE elbow from the filter to the TB. This is an example of good engineering, not just throwing parts at a car. The snorkel improvement is much needed IMO, and the large diameter elbow is the reason you see the gains throughout and not just at the very top end.

[Carlitoz3]

Very nice results!
What other mods does this car have?

[*KID*]

Nice gains

[Andrew025]

Curious what the baseline was.
Was it tuned before the intake?

[tigermack]

Need some more info!!!

[Captain Snooze]

AFRs?

[Smudgeous]

Mike, do you happen to have any AFR data from this pull? The gains certainly look nice, but without AFR data, it's hard to know how much of that power increase is "real".

What I mean by this is some intakes I've seen made extra horsepower by running leaner (sometimes dangerously so at WOT). Even if it's not dangerously lean, the intakes that show signficantly different AFRs than stock almost always show lesser gains once properly tuned, as they don't have the same amount of tuning room due to starting leaner already.

[s2d4]

Originally Posted by Smudgeous

Mike, do you happen to have any AFR data from this pull? The gains certainly look nice, but without AFR data, it's hard to know how much of that power increase is "real".

What I mean by this is some intakes I've seen made extra horsepower by running leaner (sometimes dangerously so at WOT). Even if it's not dangerously lean, the intakes that show signficantly different AFRs than stock almost always show lesser gains once properly tuned, as they don't have the same amount of tuning room due to starting leaner already.

Think about it for it second, how does it run leaner?

[Kodename47]

Originally Posted by s2d4

Think about it for it second, how does it run leaner?

Because less air passes the MAF sensor, making the ECU inject less fuel.

[Smudgeous]

Originally Posted by s2d4

Think about it for it second, how does it run leaner?

A larger circumference tube will result in air moving through it at a slower rate, which tricks the cpu into thinking it needs more air.

[zooki]

So, roughly 5-6 HP? About what a drop in filter would give you? 5 HP in a 2900-3000 lb. car(with driver) is something I don't think you could ever measure...
The OEM engineers just keep looking smarter & smarter. 😊

[Xero-Limit]

Originally Posted by Carlitoz3

Very nice results!
What other mods does this car have?

It is built for the SCCA STX class, so header, exhaust, tune etc...running ethanol for both pre/post intake.

Originally Posted by Smudgeous

Mike, do you happen to have any AFR data from this pull? The gains certainly look nice, but without AFR data, it's hard to know how much of that power increase is "real".

What I mean by this is some intakes I've seen made extra horsepower by running leaner (sometimes dangerously so at WOT). Even if it's not dangerously lean, the intakes that show signficantly different AFRs than stock almost always show lesser gains once properly tuned, as they don't have the same amount of tuning room due to starting leaner already.

Should've made this more clear in the first post (it was a bit late!) but the car was tuned on the dyno before and after the intake. We put it on the dyno after the intake to do the MAF scaling (much quicker than on the street) and to see the gains from the intake. AFR is the SAME on both pre/post intake runs. The intake has an optional insert to reduce the MAF size. You need this on the stock tune. The MAF body is HUGE. You need to make it that way to get the large radius/volume elbow in there.

Originally Posted by zooki

So, roughly 5-6 HP? About what a drop in filter would give you? 5 HP in a 2900-3000 lb. car(with driver) is something I don't think you could ever measure...
The OEM engineers just keep looking smarter & smarter. 😊

For the $$$ 5-6 hp is quite good. No drop in filter will make 5 hp on this car in an accurate test. Maybe 1-2 when a forced induction setup is using the OEM air box, but even then I'd say it is optimistic.

[kevin.nguyen]

Have this intake. The butt dyno loves it. The sound it makes at around 4500 rpm sounds so nice

[Foobar]

Originally Posted by moto-mike

For the $$$ 5-6 hp is quite good. No drop in filter will make 5 hp on this car in an accurate test. Maybe 1-2 when a forced induction setup is using the OEM air box, but even then I'd say it is optimistic.

moto-mike,

No disrespect, but do you have some data to back that statement up? It's been long accepted on these forums that performance drop-ins like the K&N, HKS, and aFe have dyno'd 5 HP over stock on a bone-stock 86.