steve_howse2004

so i am planning on swapping my d16y8 for a d15b and was wondering what will i need to do this.its in a 98 civic si

apexi_rsx

ecu for a d15b for a 96-98 ( if thats the car u have in your avatar) a d15. it will probably have extra plugs for egr and stuff but you dont need that. your harness will work axles will all work the same.

fv8s

There is an awesome write up on here. Search for it.

steve_howse2004

thanks..and do anyone know what the link is lol

fv8s

Search it. You have fingers to type correct?

steve_howse2004

so will my mounts and is the tranny from a d16y8 good?and your sure my stoc kharness will work.so just a new ecu

apexi_rsx

yes tranny and mounts will fit they're all the same. as long as it's a 5spd were talking about. auto d15b's had cvt transmissions and y8 autos are not cvt and the ecu would not work on a regular y8 auto transmission.

steve_howse2004

ya its a 5speed.so what would i do about my ecu thats in my car now will i have to change it for the d15b and what about the wiring harness?

apexi_rsx

to run the 3 stage vtec your gonna need the ecu .. the one you have will work but its not going to run the mid stage of vtec that engages around 3k. your engine harness will work fine. this motor is not going to net you any more power if that's your plan.ALso i dought its going to give much better gas mileage.

Libertariat

Might I ask why you're replacing your y8?

Like others have said you'll need the ECU and while it's not necessary, the wiring harness.

fv8s

you can use a P28 with a P2J basemap (I believe that is the JDM D15B ECU code). That ECU may be somewhat hard to find. If we are talking about the car in your avatar you will need a step down harness to run the P28

steve_howse2004

so one guy tells me i can use my harness and another tells me i cant?.so can i or cant i.and i am swapping because the y8 is a ecnomey motor and i wanna be able to feel the vtec and have a sleeper

fv8s

Feel the VTEC in a D series? hahahahahahahahha

If you find that ecu I stated you won't need a step down harness. If you use a P28 you will.

steve_howse2004

well i would swap to a b searies but its too much messing arround.

fv8s

No its not? Its incredibly straight forward. A B16 would even be an upgrade from any D series.

steve_howse2004

i have to change mounts, harness, shifter linkage cv joints. .really cant afford it..if i coud i would cuz i have a b18b11 here

grumblemarc

iTrader: (4)

I don't see any real difference in output (127hp vs. 128hp/107tq Vs. 106tq) between the 2 engines looking only at the numbers. Don't know how 3-stage V-TEC will make your ride a sleeper.
D16Y8

VTEC Also available in New Zealand under the code D16Y6

* Found in
o 1999-2000 Honda Civic SR 1.6 Vtec (UK)
o 1996-1999 Honda Civic EX Sedan
o 1998-2000 Honda Civic EX Sedan (Canada)
o 1996-1999 Honda Civic EX Coupe (VTI in Australia)
o 1996-2000 Honda Civic EX (US)
o 1996-2000 Honda Civic SI (Canada Only)
o 1997-2000 Acura 1.6EL (Canada Only)
o 1996-1997 Honda del Sol Si
+ Displacement : 1590cc
+ Bore and Stroke : 75 × 90 mm (3.0 × 3.5 in)
+ Rod Length : 137 MM
+ Rod/Stroke : 1.52
+ Compression : 9.6:1
+ Valvetrain : SOHC VTEC 4 valves per cylinder
+ Power : 127 hp (94.7 kW, 129 ps) 6600 @ rpm
+ Torque : 107 ft·lbf (145.1 N.m) 5500@ rpm
+ Head Code : P2J
+ VTEC Switchover : 5500 rpm
+ Piston Code : P2P
+ Redline 7200 rpm
+ Rev Limited To 7400 rpm
+ ECU Code : P2P

D15B 3 stage VTEC

*
o 1991-1995 Honda Civic EG4 (Japanese Market)
o 1991-1995 Honda Civic EG8 (Japanese Market)
o 1997 Honda Civic Ferio Vi EK3 (Japanese Market)
+ Displacement : 1,493 cc (91.1 cu in)
+ Bore and Stroke :75,0×84,5 mm
+ Rod Length : 137 mm
+ Rod/Stroke : 1.62
+ Compression : 9:3:1
+ Power : 128 hp (95.4 kW, 130ps) @ 6600 rpm
+ Torque : 106 ft·lbf (14.1 kg/m, 138 Nm) @ 5200 rpm
+ Redline : 7200 rpm
+ Rev-limiter : 7500 rpm
+ Valvetrain : SOHC VTEC (4 valves per cylinder)
+ 2nd stage VTEC Switchover : 2600 rpm
+ 3rd stage VTEC Switchover : 4800 rpm
+ Head Code : P08
+ Piston Code: P08-010
+ Fuel Control : OBD-1 PGM-FI
+ ECU : P08 or P2J

Libertariat

Yep. Just like I thought. Some kid who wants to be slow with 3 stages of vtec instead of just one.

I'm only here to try to prevent you from doing this so in 2 years you aren't thinking "Wtf, why didn't I just go with a b-series?"

roadsqueegy95

best advice is to forget about the 3 stage vtec, and just boost your y8

Libertariat

Indeed. There are many ways to swap an engine. You could use your current harness and splice some things, and get a jumper. Or get a different harness and make it work with the new ECU.

Either way, making a big effort to swap from a d16y8 to a d15b would be the most tragic mistake any honda owner had made. If you're going to go through the trouble of a swap at least put a cheap b18b in it. Or go faster with a cheap reliable low boost turbo build.

steve_howse2004

ya i am keeping the y8.what are some good pistons and other parts to put on it becides turbo?

grumblemarc

iTrader: (4)

I can tell you're not going to do any of your own research. Swap a B series in or turbo. NA is a waste of money on a D unless you have it to burn. If you insist then check out Bisimoto.

Libertariat

Leave your d-series alone. Stock boosted y8's can make more power than most tires you will like to afford for your car.

steve_howse2004

i dont have the money really to swap a b searies.and i dont really want to turbo cuz it will be worse on gas

Libertariat

A b-series or a turbo will both be worse on gas.

A mild turbo build you could pretty easily get 30mpg still.

Are you thinking you're going to get 15mpg with a turbo? That's just not true unless you're pushing like 350whp.

If you don't have the money for a b-series, and don't want to do a turbo, you need to find a new car if you want more speed. Oh wait, that would cost money too.

You don't want to spend money, in a hobby that is probably one of the most expensive hobbies there are.