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Discussion Starter · #1 ·
hey guys.. i wanna ask.. for NA aplication like swap head with d15b or d16z6 head, with some port n polish, mill head
how many inch of piping exhaust after header till muffler for d series user usually used ? 2 inch maybe ?

oh yeah any body here used Gude bullfrog cam ? which is better if we compare with zex,crower etc
thx alot
 

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2.25 seems optimal for n/a, but hondatuning used three inch on there budget build a long time ago.
 

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Discussion Starter · #3 ·
if u have stock engine... no cam mod, no head mill, no port n polish, can i go for 2.25 too... or its too big ?

now.. im use 1.75 inch diameter piping
 

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i have 2.5" inch from the header back, not cat, a resonator, and a muffler
 

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2.25 is good for n/a applications, but you can go 2.5 and still be ok with your setup, dont forget to install a "cat" and a resonator.
I think crower will be the best cam selection you can make!! just my thought;)
 

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I have always used 2 1/4 on all my D motors if its used for the street. Perfect back pressure. Just enough. Any bigger and it seems to lag on the bottum. Not good.
 

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Discussion Starter · #7 ·
what modification all of u have aplicated ?

my own is stock vtec 115 hp engine d15 block with d16y5 / y8 ( i dont know exactly..) head

i want to know if i use 2 " or even 2.25 " are still ok with no lag on bottom rev

because now i only use 1.75" piping, resonator n muffler, and no cat
 

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my own is stock vtec 115 hp engine d15 block with d16y5 / y8 ( i dont know exactly..) head

do you own an HX? or do you know if it has 3 stage vtec? if so its a y5.

normal vtec (EX) will be a y8. how is the throttle body located...on the side or vertically?
 

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Im actually only 16 and im almost ready to do the mini me with akmee kit, i need like 350 more dollars.
 
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stick with 2.25" with a n/a application, 2.5" at the most. 2.5" will be on the loud side on a n/a, even with a cat and resonator.
 

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Discussion Starter · #13 · (Edited)
do you own an HX? or do you know if it has 3 stage vtec? if so its a y5.

normal vtec (EX) will be a y8. how is the throttle body located...on the side or vertically?
my car is City Type z ( maybe there isn't this car in japan n US cause this is for asean )
engine code is d15a... but have vtec.. on the head P2J - IN-1 ..so i dont know exactly what type of head is it

maybe the factory built this engine with mix the d15 (88-91 civic LX) and any head of d16

TB is vertically...

from this, i want to determine what type of engine that i have, i hope someone can help me.. because i have a plan to change my head with d16z6 or y8 which is normal vtec.. if the head that i used is vtec-e head

thx...
 

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Yes in most likelihood, your engine has a typical D15 whole block but the head will be the trick part. I am quite familiar with Citys coz we have lots of em here in asia.
Your head is the same one as for a Y8 being a P2J.
BUT, your valvetrain most likely has a 16-lobe cam (which runs on VTEC-E designs)
A typical Y8 engine has the same P2J head but with a 20-lobe cam much like the Z6.
Here's what I would do:
- First, look at the ecu. If it's a P2M then it's indeed a VTEC-E but because it has a P2J head, it would classify as a NEW VTEC because of the high swirl design of the ports.
- Next, we would like to know what pistons you have. I'm almost sure it has a P08 piston same as for a JDM D15B or something almost as close (compression height & dish volume-wise) Otherwise if the piston is a P07 (severely dished and is from a 92-95 D15 VTEC-E w/ 92hp) then it's impossible to have a 115hp advertisement.
- You would then need to use the 20-LOBE CAMSHAFT, ROCKER ARM SET (complete with lost motions,cam holders. etc), DISTRIBUTOR, P08 ECU , all from a JDM D15B or a Z6 and convert the whole pizza to OBD-1.
- Try not to get a Z6 head anymore coz yours will work and is more fresh, and not to mention,, offers higher compression due to the smaller 32.8cc combustion chambers. (it's a freebie already so why get rid of it?)
- From there you can do anything you want really like chip it, swap intake manifolds, pistons and all that's in the d-series.org menu you'll find here.
- Good luck.
 

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Discussion Starter · #15 · (Edited)
whooooaaaaa... thx for your replies doc! its great n informative especially for me..

so ... from your information, my engine is mix between vtec -e which is from ECU, but use P2J that have a good port design ,right ?
how about D16y5 which is P2J code, Vtec-e and 115 hp ?

and from what i read above, i dont need change my head right ?just stick with my P2J head ..
and i can just change the internal like the cam with 20 lobe cam set ,ecu P08 which i can get from d15b or d16z6 right ? is it plug n play on my stock head, or need some modification ?, how bout P28 ECU ?

or.... what about changing my head with y8 that have 20 cam lobe ?
and i dont have to change my ECU which is OBD2
how about P28 ECU ?

which is more simple ?...
can u recomend what th best brand for intake,piston,cam,chip etc
 

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Um, there arent any cams for the d16y5 if thats what your asking. It has rollar rockers, but they can not be taken advantage of, or havent by anyone yet.
 

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Discussion Starter · #17 ·
oh yeah i just checked my ECU, because i dont have any tool to draw the ecu , so i just check the socket... from the socket i think its an OBD IIb's socket
 

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I would also say 2 1/4" for all N/A d-series hondas. That what i am runnin' and am very pleased with it.
 

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whooooaaaaa... thx for your replies doc! its great n informative especially for me..

so ... from your information, my engine is mix between vtec -e which is from ECU, but use P2J that have a good port design ,right ?
how about D16y5 which is P2J code, Vtec-e and 115 hp ?

and from what i read above, i dont need change my head right ?just stick with my P2J head ..
and i can just change the internal like the cam with 20 lobe cam set ,ecu P08 which i can get from d15b or d16z6 right ? is it plug n play on my stock head, or need some modification ?, how bout P28 ECU ?

or.... what about changing my head with y8 that have 20 cam lobe ?
and i dont have to change my ECU which is OBD2
how about P28 ECU ?

which is more simple ?...
can u recomend what th best brand for intake,piston,cam,chip etc


The simplest would indeed be to swap to a Y8 head package. But you'll end up with another P2J head as your spare. (which is still good so you can practice porting on one and have a safe stock as backup in the event you overdo things hehe!)
Anyway the D16Y5 is a 1.6 version of your engine if im not mistaken. Except for the intake manifold which I reckon yours to have the down draft design.
My engine is a D16Y5 with a Y8 manifold (P2J)...all except that it is a 16-lobe valvetrain and im in the process of converting to 20-lobe like how I outlined to you previously. The problem is there arent Y8 engines to be found here coz theyre USDM so if Y8s are abundant in your country then go for the entire Y8 head conversion package.
I'd suggest port & mill that extra head for compression and flow, order a chip from one of the experienced guys here, buy a camgear, TB, and see if you'll be happy.
That way, you'll have converted to 20-lobe & OBD-1, have a spare head, ported it yourself, raised compression,got a tune and still have your original head & parts for keeps with enough beer money to celebrate LOL!
Then you can upgrade to cams, springs,retainers,pistons etc when you decide to go for more.

BTW, you cant run the 20-lobe well if you still use your original city ecu. Better to get a P08 (maps specific for 1.5 liter vtec engine) for this, chip it, then have the option to toggle switch from stock map to your new chip.
P28s are more specific for 1.6 liter displacement but will still work if that's the only kind available there.

Lastly, go with either 2" or 2.25" diameter on the exhaust, nothing bigger than that IMO.
 
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