Torque difference EP3 v. base RSX?

[ArticSteve]

Stock torque for EP3 is listed at 132 ft/lbs. @ 5000 rpm

Stock torque for base RSX is 141 ft/lbs. @ 4000 rpm.

What internal changes are accounting for difference in these #'s?

[TrippZ]

intake manifold if im not mistaken

[beechstreet]

Dont quote me on this, but I remember reading somewhere that its because the RSX has a better exhaust system. But I'm probably remembering that wrong...

[Tenacious G]

the K20A3 in the base DC5 has a dual runner length system in its intake manfold, one for low engine speeds, one for higher resulting in the higher peak torque numbers.

[Satin 2k2 Si]

I wouldn't worry about torque so much. I think the EP3 has a different gear compression ratio than the RSX giving it slightly better pickup. The RSX might have better top speed. If I wrong someone let me know.

[EP3tuner]

It's in the intake manifold, we have the type-s manifold though, so when you increase airflow and revs (ie: hondata/cai) it's gonna outperform the base.

[Vertigo]

Yup! It's the dual runner manifold. It's kind like the old gsr one.

Satin 2k2 si- Your correct. The final gear ratio on the EP is higher than the base rsx.

[El Mocha King]

So...would it be worth it to swap our intake manifold for a base RSX IM?

[SiRacer03]

So...would it be worth it to swap our intake manifold for a base RSX IM?

I don't think so. As stated above, once you increase air flow, the intake manifold off the base RSX will not gain as much as our stock one. Correct me if I'm wrong but our stock manifold is the same as the RSX-S. Also, on the base RSX, the Hondata reflash revs aren't as high because of this.

[VIZHUNZ02SI]

no no no
its has been said
rsx base dual runners equal more torque.
ep3 doesnt have that
type-s or ctr has the same itm but bigger allowing us to gain more hp but little torque.i would install the rsx base itm to our ep3 due to the fact of compression. quicker is better . mind you (torque pushs the car off the line while hp helps it speed up)but since we dont have the mechinism to switch from the low runner to high runner it would be useless. in a way the rsx base kinda works like a small block chevy 400 for all you domestic fan. the itm has dual runners. givin it quickness at low rpms and low speed.step on the gas and the low runner switchs to the high runner(both runners open) thus alowing more air and fuel= more torque and hp

[SiRacer03]

I found it, there's already a thread about this here:http://www.ephatch.com/forum/showthr...+stage+runners

the dual runner intake mainfold simply widens the torqueband, it doesn't add any peak torque.