Air Intake Options

[totti]

nice graph totti!

your apexi pod musta been hella dirty! lol!

it was brand new

it made the $1100 all the more worth it

[tinkerbell]

was the pod on a short ram stick? sucking hot air?

[SPL_K]

wow nice gains... whats the rest of your setup?

[m0nty]

This dyno sheet is a K20a with Toda headers, Injen CAI and Fujitsubo Power getter. The very same dip in power just before VTEC engagement.

[tinkerbell]

i cant see where the power curves actually meet?

that is very different to what i am referring to...

[m0nty]

i cant see where the power curves actually meet?

that is very different to what i am referring to...

Mine isn't a comparison between different intakes though. I haven't had car dyno'd without the Injen. This one was just showing the same drop before VTEC engagement.

This one accompanies the one above. This one was before TODA headers were fitted.

[xtercii]

I reckon Mugen is a waste of money, giving you the illusion of more mid range power by having better throttle response, top end is nothing spectacular compared to say Injen. And for the amount of money it's asking, the quality isn't up there.

[m0nty]

I reckon Mugen is a waste of money, giving you the illusion of more mid range power by having better throttle response, top end is nothing spectacular compared to say Injen. And for the amount of money it's asking, the quality isn't up there.

I'd rather a smooth power band and better throttle response than top end anyway. A K20 out of lift is a torqueless lump of metal. When shortshifting round the track my car constantly falls out of lift. The fish hook at WP is my biggest gain potential. I just need to have the car sorted for that corner. The only other gains I can see are from extra power. Every little bit counts when you're trying to pick up 10ths of seconds.

[macoman69]

I'd rather a smooth power band and better throttle response than top end anyway. A K20 out of lift is a torqueless lump of metal. When shortshifting round the track my car constantly falls out of lift. The fish hook at WP is my biggest gain potential. I just need to have the car sorted for that corner. The only other gains I can see are from extra power. Every little bit counts when you're trying to pick up 10ths of seconds.

How do you fall out of VTEC unless you have shifted before redline? Ive got an injen intake and have found that it does have a power dip around 3-4k but never have i fallen out of vtec on shift.

And even with a power dip around 3-4k who really uses the car under 5000rpm on track? Usually you would stay in vtec pretty much the whole time. Correct me if im wrong?

[m0nty]

How do you fall out of VTEC unless you have shifted before redline? Ive got an injen intake and have found that it does have a power dip around 3-4k but never have i fallen out of vtec on shift.

And even with a power dip around 3-4k who really uses the car under 5000rpm on track? Usually you would stay in vtec pretty much the whole time. Correct me if im wrong?

Because I short sift to look after the motor out of that corner. It's an off camber left hander down and then back up a hill. I've seen many motors pop thanks to sucking dry round that corner. It's not a speed thing but a reliability thing.

[macoman69]

Thats an issue of oil starvation isnt it? Baffled sump should fix that problem

[m0nty]

Thats an issue of oil starvation isnt it? Baffled sump should fix that problem

And it will. Until then I'm not gonna ring it's neck. It's easier to fit a baffled sump than redo the bottom end. Err on the side of caution I say.

[tinkerbell]

Mine isn't a comparison between different intakes though.

neither is mine. it is a 'before and after' dyno tune

I haven't had car dyno'd without the Injen. This one was just showing the same drop before VTEC engagement.

what MY graph shows is an apparent issue that the "long tube" CAI's have with a resonant frequency power flatline (as indicated by the pink circle on the picture i posted).

i am not sure if this is an issue for the shorter length DC5 CAI's... and your graph indicates that it is not and issue.

the big power gains after 5500rpm are the results of cam gear tuning by Adrian from Toda Racing...

[Elwood]

what MY graph shows is an apparent issue that the "long tube" CAI's have with a resonant frequency power flatline (as indicated by the pink circle on the picture i posted).

what is the reason for this 'flatline'? if the issue for the longer CAI is throttle response, why would this occur at 4000 rpm?

[Didz]

what is the reason for this 'flatline'? if the issue for the longer CAI is throttle response, why would this occur at 4000 rpm?

yes its because the air as to travel further.

My guess is that it happens at around 4000RPM because the engine starts preparing to engage vtec. Try driving your car a bit and slowly reving it up. You should notice a distinct noise change before the vtec engagement point then a further noise change when vtec fully engages.