DIY Stock Intake Mod

39855 Views 90 Replies 34 Participants Last post by foreverkidd, Mar 30, 2011

Supraman16

Discussion Starter · Oct 4, 2008

Hi Guys,

Well, I got to thinking about the stock dual stage intake and figuring out a way to keep fender side intake opening open all the time. In case you didn't know, the fender side intake opening is closed until around 3600rpm, which is when it opens up, thus resulting in the now infamous and much beloved "IS-F Roar". As you can see from the picture below, all I did was just pull off the vacuum hose from the actuator and plug off the other end with a vacuum cap. Now the "IS-F Roar" comes on around the 2300rpm, and to me atleast, there seems to be a bit more power down low...which makes since because now the engine can breathe a bit better down low with both intake opening being open all the time. The only downside would be if this throws off the air/fuel ratio's from stock. I don't think it will drastically, but I'm not sure. Anyway, try it out and let me know what you guys think. Oh yeah, no check engine light either! Have fun...Darshana S...

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retrosolutions

· #57 · Mar 29, 2009

Fig, please post the p/n for the amsoil filter if you kindly would, thanks

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retrosolutions

· #59 · Apr 17, 2009

after a week of having done the solenoid disconnect, and driving around my impressions are as follows:
1) off the line low rpms - seems more responsive
2) mid range - might have lost a little bit of torque in the normal driving band, just seems a little less responsive to me. Although, given the better volumetric efficiency this should not be the case unless the ECU/O2 sensor are playing a role, but this should be a simple closed loop feedback, no?
3) high end - well, no change because its the same as before
4) sound is definitely more smile provoking now

A very small side note, I seem to percieve an eerie rythym between the intake and exhaust frequency. Its almost like one cylinder is more distinct, and the lag between the intake "pop" and the exhaust "pop" amongst those in the background are....well, subtly more noticeable. Just an odd observation I had.

Anyways, its worth the 2 secs. to disconnect and try it out for two days.

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retrosolutions

· #65 · May 12, 2009

I still experience some low rpm bogging after gear changes in normal driving. I have not yet bothered to plug it back in yet though.

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retrosolutions

· #70 · Nov 15, 2010

Jeff Taylor said:
I have just gotten around to trying this mod. I'm a bit mixed on it so far. I haven't noticed much of a change in performance, but I'm not 100% sold on the sound yet.

Have the original posters kept the mod, or gone back to stock? Has anyone noticed any problems? Just curious.

Thanks,

Jeff
08 Smoky Granite Mica IS-F

Went back to stock a long time ago

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retrosolutions

· #72 · Nov 16, 2010

Jeff Taylor said:
What made you decide to go back? The sound or warranty/performance concerns?

Thanks,

Jeff
08 Smoky Granite Mica IS-F

the sound was nice but it was a step back in performance, albeit slight

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