Ram Air...

[noodles025]

Hey everyone i just made and installed a ram cold air intake on my civic. I have a DOHC ZC and i was wondering what kind of HP increase i can expect from something like this and what kind of gains others out there have got from this sort of application. All help would be great...

Cheers Ash

[BoomBox]

Maybe 5%, so 6hp, with out an aftermarket exhaust your not really increasing airflow as it will be restricted by the factory exhaust. remember Engine = air pump, more air flow more HP.

[modsHXcivi]

Post up some pics, Id like to see how it looks

[civicnation425]

Maybe 5%, so 6hp, with out an aftermarket exhaust your not really increasing airflow as it will be restricted by the factory exhaust. remember Engine = air pump, more air flow more HP.

not exactly, there is a limit to more air flow... stock motor w/ over 2" exhaust tubing is just overkill can even drop HP. And personally a 6hp increase favors on the really good side.

[d16z6_eg-6_boi]

post up some pics would like to see how it looks like.. maybe just like a 5 hp gain maybe...

[snoborder280]

not exactly, there is a limit to more air flow... stock motor w/ over 2" exhaust tubing is just overkill can even drop HP. And personally a 6hp increase favors on the really good side.

I'm pretty sure (not 100% positive, but fairly certain) you can run up to 2.5" tubing without dropping any hp on a stock engine, but I wouldn't touch anything over 2.25"... (For the record, take a look at your mid-pipe sometime... the tubing's like 2.25" stock)

Anyway, here's some average gains from basic mods (Unorthodox Racing advertisement, Modified Magazine, December 2005)... I know, these are high estimates, but blame marketing at UR, not me:

Intake = 4-8 HP
Header = 2-4 HP
Cat-back exhaust = 4-8 HP
Lightweight Pulleys = 8-11 HP

I'd say about 5 HP gain from an intake...

[Clutchmaster]

Maybe 5%, so 6hp, with out an aftermarket exhaust your not really increasing airflow as it will be restricted by the factory exhaust. remember Engine = air pump, more air flow more HP.

love the analogy

[Genuine Rolla]

there's no way you're going to get 5HP just out of an intake..unless there's something spectacular about the ZC that i didnt know about and responds well to I/H/E mods like the k20 does. you'll get maybe 1HP out of an intake and MAYBE another HP out of Header and exhaust. Unless there are dyno's to completely prove me wrong...then go ahead.

[civicnation425]

I'm pretty sure (not 100% positive, but fairly certain) you can run up to 2.5" tubing without dropping any hp on a stock engine, but I wouldn't touch anything over 2.25"... (For the record, take a look at your mid-pipe sometime... the tubing's like 2.25" stock)

Anyway, here's some average gains from basic mods (Unorthodox Racing advertisement, Modified Magazine, December 2005)... I know, these are high estimates, but blame marketing at UR, not me:

Intake = 4-8 HP
Header = 2-4 HP
Cat-back exhaust = 4-8 HP
Lightweight Pulleys = 8-11 HP

I'd say about 5 HP gain from an intake...

but what would be the point of going to 2.25? nothing you still get the same performance gains with 2". But Genuine is right on the money, increased airflow in an already small displacement engine will not do magical wonders of over a couple HP... Put a full airflow upgrade on a 350 or something like it and you will see a difference, but civics? maybe 8-9 hp MAX with an IHE upgrade

[Genuine Rolla]

our small displacement engines, we need the right amount of back pressure or we're just going to lose power. 2.25-2.5 is ok...i think you start to lose power at 2.5. 2.5 would be a good for a B18, B20, etc. These engines were built for economy in mind, not to respond to aftermarket mods at that high of a rate. if anything you'll gain out of an intake, header and exhaust is better gas mileage. thats why i put on intake and exhaust on mine.

http://www.clubcivic.com/board/showthread.php?t=98212&highlight=intake

check that out.

[JDMderf]

our small displacement engines, we need the right amount of back pressure or we're just going to lose power. 2.25-2.5 is ok...i think you start to lose power at 2.5. 2.5 would be a good for a B18, B20, etc. These engines were built for economy in mind, not to respond to aftermarket mods at that high of a rate. if anything you'll gain out of an intake, header and exhaust is better gas mileage. thats why i put on intake and exhaust on mine.

http://www.clubcivic.com/board/showthread.php?t=98212&highlight=intake

check that out.

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