going to temporarily change my 99 spec 4-1 headers with some 96 spec 4-2-1 headers , what loss will i see? surely not anything major?

 

surely.

 

really? forgot to mention im talking jdm type rs not sure about yall

i think these are what ill use;



im thinking more bottom end power? lol like i need it i have a b20 bottom and a few mods, tyres spinning all over the damn place, lol

id like a dyno figure still... nothing really, to ask... lol

 

I have ran both and couldnt really tell the difference. The only reason I went to the 4 to 1 header was the 8.5 lbs weight savings.

 

thanks alot makes me feel bet... HOLD ON! b8.5lbs lighter?

 

My 96 spec JDM ITR swap came with the 4-2-1 header. Due to the fact that it is heavy and ugly I went to the JDM 4-1 ITR header. I weighed them both for the hell of it and the 4-1 is 8.5 lbs lighter. I honestly couldnt tell a difference in performance.

 

as far as i know, there isn't a performance difference. the 98+ motor has a slightly better torque curve. i just have no idea if that came from an ecu map tweak or the header. the 96-97 header is like the bargain header of all times. you can get one for $150 all day and they actually perform

 

the reason the 98+ motor has a little better performance was the intake cam has better lift and duration. exhaust cam was the same, that of course had a slightly different map on the ECU. the 98+ JDM motors also had the 4-1 Header which yeilded about 3-5 HP, maybe a little more with Tuning on a Hondata or other tunable ECU setup.
A built B20 setup would benifit greatly from a larger primary header, a little JDM 4-2-1 or even a 4-1 would give OK gains, but a nice B20 header would yeld some great numbers if it was tuned.

 

I cant see 3 degrees helping much if at all.

 

I would almost agree with you, but just doing a valve adjustment to the tightest spec gives you some noticable gains which will show on a dyno, so even 3 degrees yields a small gain. Here is an old post with all the Cams out there for B series, the duration spread starts at about 3 degrees between levels and goes up from there. lift does not substantially increase as the threat of slapping a valve to a piston is already an issue.

https://honda-tech.com/forums/acura-integra-type-r-8/98-itr-ctr-intake-cam-%3D-zooommm-1388379/


OP, to your original question, I still think you would see a power loss with a 4-2-1 from a 4-1 as you are running a b20 bottom end. Big tube headers give some good gains on a B20 hybrid motor, and choking it down with a 4-2-1 will decrease performance IMO.

 

It just seems like a trivial difference between cams. However I guess they designed it like that for a reason, right?

 

Yep, consider that although 3 degrees seems small, it allows 1.4 % more fuel/air into the chamber on any given stroke, so that would give you a slight increase in available charge, giving you about the same change in HP, maybe 2-3 between the 96 spec to the 98 spec.
If I was going the Cam route, I would go Jun stage 2-ish if I could find em.

 

So I take it you decided not to sell your caR?

 

the jdm 4-2-1 actually has bigger primaries (id) then the jdm 4-1

 

well i decided to keep my headers, and im not sure about selling the car, its hard to replace, you guys should know how that feels... lol

 

that 3deg is only @1mm, total duration i thought was unchanged. also, for the jdm motors, more than a few places mention the cams being the same 96-01, i know the us cars got the ctr cam in late production but i have never been able to confirm it on jdm. personally, i can't see how such a tiny cam difference could bring on much of anything. even going to skunk1's which are larger than either rarely gets anyone more than 3-5hp over plain itrs

the ecu or header i could see easily creating the better torque curve which is all the 98+ has. there is no hp difference