Question About Horsepower Loss?

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NeedACivic

Member
I have a 94 JDM GSR with a Skunk2 Intake Manifold and a generic short ram air intake in my 92 Civic CX Hatchback. I have drove my car running straight header with NO exhaust and then i drive it now with my stock 1.5 or 1.75" exhaust and i feel a pretty big power loss, my question is how much hp do you think im losing due to having a completly stock exhaust?

Also what size piping do you think i should go with when i get it all re-done?(P.S. I plan on forced induction in a couple years)

THANKS!!!
 
No clue, maybe 50, once you put some apc vinyl you should gain it back...................


seriously, get a 2.25"-2.5" mandrel bent header back system and your good to go. Going NA of course.



Milan
 
I did the same with mine B16, ran it through the stock VX exhaust. It was horrible, but yea like Milan said, some 2.25''-2.5'' will do you some good.
 
With boost, you want 2.75 or 3" piping...In the meantime, get a full CAI, the difference between the two is night and day--the short ram is basically just sucking up warm air floating around in the engine bay.
 
Originally posted by JDMilan@May 31 2003, 01:27 AM
No clue, maybe 50, once you put some apc vinyl you should gain it back...................
Click to expand...

HAhahahah ....... You are My Hero ...
Like He said Man... The APC vinyl Adds a Good 120 hp At the wheels and 53-124 Ftlbs ... Of torque......... But Depending on the Status Of your car. (Daily Driver or Track Car) You probabally wanna go with 2.25's.... That is a nice Generic number for an Engine that Fuckin Breathes.......
 
what Afipunk21 said.......a tru cai..........u will definteley feel a major diffy man in tha breathing of ur car!!!!!!!! short ram is more direct and has a better response time but ur still suxin in warm 2 hot air in ur engine bay!!!!!!!!!!

on ur piping tho.....i say 2 1/4 - 2 1/2 piping on ur ride if ur goin n/a dawg!!!!!!!!! also i don't kno how strict ur emissions r but running headers str8 2 tha exhaust open it up a lot more also!!!!!!!!! in my state we have no emissions so most of us do this!!!!!!!!

:D B) :worthy:
 
dido with what AFi said if turbo then larger like 2.75+so the turbo can spool up. I always say for higher reving NA apps to go with 2.5, get a header that has a 2.5 collector along with some generic testpipe. Or go with my favorite setup for NA

SMSP header
2.5" all the way back with no resonator
ES oval muff (flat black , nice and tiiite, lol)


Milan
 
obviously almost any exaust setup wont have the power of straight headers,youll still feel a loss...engine braking...right?
 
thats what contained exaust does....engine brake,just jike semi's,any exaust back pressures at least a little thereby not letting all the gases escape the cylinders in-turn not letting as much o2 in on the next rotation=less power,str8 headers are always more powerful cause no back pressures.now I am kinda new to the small engines but an engine is a engine,am I right,maybe the exausts on these honda's are perfect but mine isnt and I dobut any exaust flows completely open,but again I could be wrong
 
your cam,not backpressure, should? control your valves.and a header still has a little backpressure.
 
Are you two talking about "straight pipe" from the header to the muffler? ie: no cat.
 
Originally posted by 92b16vx@Jun 2 2003, 12:51 AM
Are you two talking about "straight pipe" from the header to the muffler? ie: no cat.
Click to expand...

no,I was just stating that anything,even headers create a little backpressure so any exaust will seem like a powerloss if you've been driving w/just headers due to increased backpressure,but as I stated this has been my experience with deisel semi's,v-8's,motorcycles,havent played w/my honda exaust system much yet but cant imagine a difference...........basicly I was trying to explain powerloss from engine braking.I would dig your prospective,I generaly trust and like your comments :D
 
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