Larger intake pipes - lose torque down low?

[evoman]

More a query purely out of interest more than anything..

Has anyone done a before and after dyno showing torque readout after fitting a larger intake pipe or even a pod filter to an FTO?

I have a before and after power and AFR graph from UAS(and have seen others) showing the UAS pipe is good for more KW's particularly higher in the rev range - so everyone knows that, but I am curious what the torque curve would look like.

I recently sold the UAS pipe off my car to bass_twitch as I am selling my car, and since putting the stock pipe back on I would say the car actually feels BETTER in the low to mid rev range. It seems to have a bit more torque and is noticeably more punchy - something I didn't notice losing when going the other way. Funnily enough, when I put the pod filter on occasionally for a laugh I often thought the same thing after putting the stock box back on. IF anything I would say both the bigger pipe and pod freed up the top end, but lost me a bit of lowdown punch.

Anyone else noticed this before? Of course this is my seat of the pants dyno so yeah...

[bass_twitch]

Well since installing your pipe and getting a larger pod, I haven't noticed any major gain down low, but once MIVEC hits in, it seems like it is a bit faster/bit more of a kick.

[Supplanter]

Same filter or did you replace it with a new one?

[bass_twitch]

Same filter or did you replace it with a new one?

New.. went from 3" K&N to 4" K&N, so not a true test I guess..

[bass_twitch]

Same filter or did you replace it with a new one?

New.. went from 3" K&N to 4" K&N, so not a true test I guess..

Actually after driving it a bit more today I'm going take back what i said before, I feel the car is probably more responsive down low too since the upgrade

[BearOnFire]

When i had my UAS did notice lost of low-end torque, city driving for example but around MIVEC range and above the induction sound
is telling you to hold on to that gear just a bit longer
That rectangular section on the standard pipe i feel is a cleaver design.Holds air when ya foot off the accelerator after a good flooring.
Don't recommend smoking but a cheesy test you can do is fill the two pipe with ciggie smoke. UAS didn't hold air as well so keep try to keep the revs up
With the UAS pipe doing 110km/h freeway speed, the engine sat at 3000-3100 RPM.
Standard pipe sat at 3500-3600 RPM.
Drive safe.

[Astron_Boy]

I remember an old Dyno day where Aza had the whale penis on and had a couple of runs.
The power/ torque dipped significantly at the mid point (mivec)
Going back to his previous set up the same day, 20 mins later if even, and the torque/ power curve were spot on.

In the end his larger intake did make a substantial difference to how the car ran and delivered it's power.

I believe Aza had it fixed, (correct me if wrong) by having a tune done, as he has a piggy back ECU inline with the factory.

[aza013]

The dip was tune related not air intake, but in saying that it's all related It just came down to getting every thing working together.