h23 intake manifold

[weldingtodd88]

im new tot his site and i noticed people talking about putting a spacer in the h23 intake manifold, do you just take another one off an h23? and does it produce enough power to notice at all?

[Jon]

Depends on your setup.

If you have an A1 or A4, upgrading to an A6 or H23 intake plenum/runners/throttle body is a great upgrade.

If you have an A6 already, don't bother.

[93F22A6]

if you have an a6 do bother get the top intake of the h23 with tb and get the butterflies and use the one off the h23 as a spacer. itll flow better than stock you might see a lil gain possibly 5hp if that but its worth it.

[visualpoet]

OP has an h23a. Get the spacer from another one, delete the butterflies, seal the rod holes (jb weld ftw) some longer bolts and put it in. You should get a little more low end torque.

[weldingtodd88]

so i have a spacer in there now with butterfly valves and all that, so i can take them out plus add another spacer after i take everything out?

[93F22A6]

yes

[weldingtodd88]

kick a**, thanks

[totaldoughnut]

You want one spacer with butterflies and one without.

[93F22A6]

or you can both w/o and it will work just fine. the less restrictions of air flow the more POWER just basic engine fundimentals

[zone90cb7lx]

doughnut knows what hes talkin bout, other people mention bout taking out all butterflies but they are there for a reason, keep the lower set in....

[oneoffaccord]

http://www.blacktrax.net/BTP_IMS.html

[weldingtodd88]

why would you keep one set in? what are they for?

[93F22A6]

im guessing mostly mpg for norm driving they only open at a certain vaccum

[visualpoet]

The belief is that all eight open will actually harm low-end torque. It's not the first time I've heard this, and not just here, but I never understood how having more air available could be bad.

[totaldoughnut]

The IAB's or "butterflys" dont open at a certian vacuum. Although they can be setup to do so. The ECU controls when they open, and if you have a tuned ECU you can set at what specific RPM you want them to open. An A6 or H23 manifold have eight ports under the plenum, four square and four round. The square ports are your primaries, the rounds are your secondaries. To aid in low end power your engine runs off the square ports, when you reach higher engine speeds and its more benificial to have more airlofow the ECU opens the secondaries giving you more topend power. Keep the system intact, run one spacer on top of the spacer with the secondaries. As ive read in a few posts earlier "its just basic engine fundementals".