Hi Guys!

I currently own a L13A I-DSI Honda Jazz. My current mods include spoon b-pipe and streets muffler/axle back. At the moment i feel that the flow of the system is not performing as i would like it to is this because i am running a stock manifold?? And could i just ask what are gains for an aftermarket manifold??

I tested both the b-pipe with a stock axleback and the vice versa with the axle back with the stock b-pipe and there was no different...so im wondering if a header would be best to change this...im thinking of getting the Spoon header. Also would a small engine like mine be worth getting re-mapped, and would this alter/change the flow of my exhaust?? Don't forget I only have the 1.4 I-DSI engine not a VTEC

Cheers.
Michael

 

the whole idea for extracting more power out of such a small engine is buying aftermarket parts that help it breath more efficiently. i would start with getting an intake so it is getting enough air to breath. then work on the exhaust side. the quicker and easier the exhaust can flow out the better the car will run. so a header will open up some ponies if the rest of the exhaust is already opened up. a cat delete will help too but is not an emissions friendly modification and is illegal.

 

Okay...Thanks!

Oops i forgot to mention that i do have an ARC induction kit. Yeh the header may give it an extra hp but i don't really know. The price for a header is quite expensive as well.

 

The stock piece on a VTEC suck big times... The outlet of the Header is 1-5\8 int. where the exhaust is 1-3\4 int... The Header is limiting the most on the exhaust side IMHO! No wonder a Cat back on a fit is only worth something like 2HP... Put the Same Cat back behind a well designed Header and it may be worth 5HP or more!

Marko!!

 

The Truly Amazing Honda Fit/Jazz

That should help you understand what you engine is actually trying to achieve.

Modifications that I've actually made to my GD1 L13a 2002 Sport that have helped are:

Retained orignal air intake box just changed the filter to a faster flowing one

Changed the spark plugs to iridium ones

Running a tanabe backbox and original exhaust til the engine

These changes have helped the mid range take of my car I feel

0- 32mph dealt with in first
33-58mph dealt with in second
58-80ish can't remember exactly
up to 105mph in forth
lost top end now as the engine is probably running a little lean and exhaust is not sorted.
I have achieved a top speed of 130mph downhill but ran out of road and I felt like I was floating a lot.

Running 16" slipstream alloys now they save weight
currently updating the exhaust hope to get a 4-2-1 header and work back from that. new air intake and weapon r inlet manifold to fix airflow completely. Then better fuel pump and throttle body (larger bore).
New J's Racing suspension and facelift to 2004/5 honda sport with the sideskirts and better front bumper to eliminate the floating i experienced as this will lower the cat 30mm and stop air going under the car causing lift and drag and all things bad.
Then a remap and job done unless I strike oil then I'll fully carbon fibre the car.

So that's my life story sorry for going on laters