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Quote:
Originally Posted by crx88rb
I really can't see why any competent exhaust fitter won't be able to modify it to suit if there is indeed slight differences in the bolt patterns.
Give Pete at Exhaust World in newcastle st, perth a call and he'll sort it all out for you. I got mine headers and full 2" system done by him and I'm v v happy. He sells Xforce also and his prices are one of the best in town.
why not use the SOHC D series headers? they bolt up the same and thats all that matters.
its not like the headers are specifically for SOHC d's and not DOHC d's.
i think the engine series they are designed for might be little more important lol. ie: the B series headers arent going to bolt up.
basically forget about how many cams the engine has cos its irrelevant in this case
yeh, i just cant believe its so hard to find what i am looking for
dont worry i went through the same thing. but from what i've been told from many ppl on a number of forums who have tried, any d series header should fit
In regards to TODA headers, is there a choice for size? Should I get 2.25 or 2.5"?
Also, anyone ever 'upgraded' from X-Force headers to TODA ones? Any difference?
what extractor and catback u got?Quote:
Originally Posted by EG30
I saw that hitech headers review. I reckon theyve fudged up the results somehow. You cant get a 51hp atw gain from headers especially on their own on a NA engine. Headers raise power through ability to flow more air out of the engine, if at least the intake side isnt upgraded they can only restore power the factory headers are restricting. To get 51hp atw gain (45odd kw at the fly) from headers you would need a v8 supercar or something that has its 200thousand dollar engine but standart ford au xr8 headers or something on it and then change to race spec as the headers in this instance act as the bottle neck of the system. An extreme view is like there is no point having a 3inch exhaust and everything if you have a muffler from a diahatsu move on the back! Headers are the same, they will give gains as the factory one isnt perfect but in reality it cant change the power that the engine block can make at the flywheel.
The best way to view it is that the power we see from an engine is the power at the wheels, forget flywheel. However, flywheel is the max you could get at the wheels in a perfect world. If you have a 160hp engine (b16a for example) then you add the intake and exhaust system you lose a little bit of power from restriction. You then make it spin a clutch and flywheel and axles and wheels etc. This is why you see closer to 120 hp at the wheels. Without going inside the engine or adding a turbocharger you can only EVER get the power toward 160hp never above and you do this by lessening the magnitude of the restriction that is placed on it.
Therefore if you have say a b16 and it has 120 hp at the wheels and you put make it as efficient as you can with lighter components and less restriction outside you will still have less than 160hp at the wheels, convincingly. To have headers jump an output to pretty much what the engine has on an engine dyno is ridiculous and impossible.
I want to know what the go was with that review.
DC headers and x force headers seem the more popular reasonable priced headers for a honda.
Scott
Made in Hong Kong
So far in testing we have obtained a 13kw atw gain on a B20.
With 12.5:1 comp, running AEM engine management.
yes they can change the power made at the flywheel. i would wager that an engine makes more power with a well designed header than with none at all.Quote:
Originally Posted by crx51
i think you may be confused between power lost as a result of drivetrain etc. as opposed to power lost as a result of poor flow characteristics in manifolds
lower power readings at the wheels as compared to at the flywheel are a result of parasitic losses of power. ie: power used to move certain components.
the exhaust system onm the other hand affects the power made by affecting the ability for an engine to flow gases through the head, thus how much power is made at the flywheel.
its not a case of having a bare engine, with no intake manifold or exhaust manifold, which makes X amount of power and then everything you add to it is a loss on power. the manifolds are a vital component of the operating engine.
Fair call. What i was trying to get at is that the base engine is where the power is, and you can add things to the outside and you will get gains but it is due to these components being better than those that were benchtested standard. There is still no way that a perfect set of headers even could give 50whp on a 1.6 or 1.8 NA engine. No way in the world. But yes you are right i included too much in the losses incurred on the engine's flywheel power and yes i generalised a bit. Stupid of me,
yeah, i agree. it is very hard to believe such a percentage increase from just a header.
maybe toda can explain it to us ..... i see it as being impossible . 15hp even , is MASSIVE .... well on an h22a anywayz, not too sure about civics n such.