4GEN Liberty/Legacy - RAM INTAKE SYSTEM

[Tradewind]

Tim, just looking at the initial graphs more closely, bottom end power and torque is quite a bit down from the stock intake - do you have to sacrifice low end to make more top end with these types of intake?

H6 as you know is a flat torque engine as it is; ideally power/torque figures from 2000rpm up would be the same as stock but with a nice gain north of 6000rpm until redline.

For those runs I needed to start the NA one lower so the comparison is correct, it benefits from kicking off with more rpm on board. We are running more tests in next week or so if I get time, I would say the picture at the bottom end will look more complete

The test setup advantaged the stock intake in terms of testing, it had the benefit of higher rpm start point and lower intake temp but still couldn't match the tuned ram tube for final output and rising torque curve from 4000rpm on. To drive it, I didn't notice a low end loss at all, in fact it was smoother than the stock CAI

Next time I will be sure to try and get the stock intake to pull smoothly enough from lower rpm so I can floor it properly and get it reading from lower rpm to compare more directly

[alessandro132]

Next time I will be sure to try and get the stock intake to pull smoothly enough from lower rpm so I can floor it properly and get it reading from lower rpm to compare more directly

Sounds good Tim

[Tradewind]

It will come as a surprise to many - we are still using a major piece of the stock intake as well

Just a matter of changing the right pieces

[alexeiwoody]

This intake sounds very interesting....would love to hear more?

[RX25SE]

Subscribed.

Would option 3 be available with a suitable tune?
Then the entire package is plug and play.

[alexeiwoody]

I know I've got a turbo 4 banger, I just thought a good intake is of interest to everyone. ..

This 10kw gain is it compared to a stock tune with a stock intake?

[Tradewind]

I know I've got a turbo 4 banger, I just thought a good intake is of interest to everyone. ..

This 10kw gain is it compared to a stock tune with a stock intake?

The same tune file EXCEPT for MAF scaling alone - was used in the back to back comparison. The tune itself is a true retune by an aftermarket tuner, it is not the factory Subaru tune. This way we remove the benefits that you can find by tuning along between stock and tuned

I do have a specific tune for the tuned RAM intake, will be interesting to see what power it can make, tune V4b should have some extra beans waiting to be unleashed

[alexeiwoody]

Awesome! Now that sounds really good

[Tradewind]

This is still a 10Kw gain with all other gain opportunities already utilised

[alexeiwoody]

Yeah it sure looks that way, will keep an eye out for the development of this beast

[SegR]

Interested to know why these results contradict apparently conventional wisdom that intake mods bring bugger all benefit.

[Tradewind]

Seg

I am using a piece I have used in the past, it always produces somewhere around 9-13hp gain without fail. It is extremely good at filling the system with lower losses

[Tradewind]

Tried to get some sounds - for better or worse

What isnt captured but you can hear it in background is the resonance within the engine itself, a ringing sound that just is plain racy

Window down - iphone used to capture

[alexeiwoody]

Interested to know why these results contradict apparently conventional wisdom that intake mods bring bugger all benefit.

Normally changing air intakes doesn't add much below 250kwatw for our cars. If someone is indeed getting such a phenomenal increase, it's worth checking out.... smoothing out the inlet pipes, increasing pipe size...a silicone turbo inlet pipe usually nets nearly 5kw...whilst swapping the std airbox to a pod filter, usually nets....uh not much. Some say response is gained...hmmm

I'm thinking this new cai improves the inlet pipe more so than the filter...am I on the right track?

[Tradewind]

So long as the air inlet isnt seriously bad on a turbo engine you couldnt expect to make any gains - as the turbo wastegate will be staying shut until it reaches its predetermined manifold pressure. If pressure isnt reached then the turbocharger simply has to spin faster and will draw in more air until the wastegate pressure is reached. It isnt all that simple tho, as dirty airfilter etc will still cause performance fall off


With NA its a different story as there is no device to keep manifold pressure constant, you simply have to let in as much as possible and raise the plenum pressure best you can. In this case with the Raptor intake we have halved the pressure drop, with nearly 50% more air pressure available in the plenum compared to stock! Thats where the power gains are coming from. You dont normally see data such as I have put forward so far as CAI's go. Every manufacturer should publish air pressure gain in the plenum, engine power increase and finally intake air temperature. With those few bits of info you can be reasonably sure you are going to do better than stock, gains for the $$.