Hondaswap.com | Honda Technical & JDM styling Forums

kg728 · 10-13-2008, 11:38 PM

Hey, I need some help on a swap I am attempting to do... I recently bought a JDM d15b VTEC that I want to put into my 89 CRX HF.
I know I have to change the ecu to a p28 or a p08--I was wondering which one would be better--in order to get the vtec to work. Also, I want to know what other parts I'll have to buy to make the swap work and which ones I can just use from my current setup with the stock motor (d15b6). The motor came with the d16z6 throttle body, and I was wondering if I could use that, or if I'll have to use one from the d16a6. Or if I'll even have to change the whole intake manifold to the d16a6.
Will the distributor from my current motor work, or will I have to get another one? I was also wondering about the alternator and about all the senors...

Anyways, I was just wondering if any of you guys could help me out. Thanks!

AHHVTEC · 10-14-2008, 12:06 AM

use the po8, convert to obd1, and drop it in there nothing else needed other than running wires for vtec, and off you go

kg728 · 10-14-2008, 12:18 AM

Thanks for the help! Are you sure I don't have to change the distributor though? Or the throttle body?

AHHVTEC · 10-14-2008, 12:19 AM

no, just got to convert to obd1 and run wires for the vtec and thats it

kg728 · 10-14-2008, 12:20 AM

Also, does anyone have an estimate on what power and gas mileage I'm going to get with the new swap? I have h/i/e mods...

kg728 · 10-14-2008, 12:21 AM

Ok. Thanks! I'll get to work on it soon then, and see how it works...

AHHVTEC · 10-14-2008, 12:21 AM

well they come with 130hp

kg728 · 10-14-2008, 12:24 AM

Yeah, I know that much... I was just wondering if anyone had any idea how much the slight mods might give it.

philyphreak2127 · 10-14-2008, 08:25 AM

Not much. Keep in mind most of these horsepower ratings are unfortunely at the crank. So when it comes down to it you will really only be putting to the ground around 100 horses...If you don't mind me asking why would you swap out a z6 for like 10 more horsepower? Why not spend the money on the motor you have now? I too am going to swap a d15b in my car but that is only cause I screwed up another motor. :-( So the P08 is the right ecu?

AHHVTEC · 10-14-2008, 10:19 AM

Quote:

Originally Posted by philyphreak2127

Not much. Keep in mind most of these horsepower ratings are unfortunely at the crank. So when it comes down to it you will really only be putting to the ground around 100 horses...If you don't mind me asking why would you swap out a z6 for like 10 more horsepower? Why not spend the money on the motor you have now? I too am going to swap a d15b in my car but that is only cause I screwed up another motor. :-( So the P08 is the right ecu?

because his car does not have a z6. it came stock with a non vtec d15 with about 70 hp

philyphreak2127 · 10-14-2008, 03:29 PM

Oh my fault. I totally skimmed that paragraph and obviously missed a lot. lol Well that answers my question completely. So in that case swap it now!!!

kg728 · 10-14-2008, 08:09 PM

Yeah, my current motor actually only has 65 hp and puts about 50 to the ground.. lol. It also has about 210k miles on it, and the clutch went bad, so I figured this was a good time to do the swap.

kg728 · 10-14-2008, 08:11 PM

AHHVTEC, how do you recommend running the wires for the vtec to work?

philyphreak2127 · 10-14-2008, 08:29 PM

Probably not a bad time! lol

kg728 · 10-14-2008, 11:05 PM

Btw, where can I get a p08 ecu? I'm having a really hard time finding one... I can only find the p28 ecu's...

AHHVTEC · 10-14-2008, 11:23 PM

a p28 will work also i just like sticking to the ecu thats made for the motor, but just run the vtec wires to the proper pin out on the ecu

philyphreak2127 · 10-14-2008, 11:32 PM

I agree with sticking to the original ecu however I am also having a difficult time finding a p08

AHHVTEC · 10-14-2008, 11:37 PM

me too lol,

AHHVTEC · 10-14-2008, 11:38 PM

keep in mind if you use the p08 ecu you need a 1 wire o2 sensor if you use the p28 you need a 4 wire o2 sensor

philyphreak2127 · 10-14-2008, 11:41 PM

geez man if I didn't love working on my car I wouldn't be able to remember all this stuff lol. But does that apply the o2 sensors thing if I run a obd2 to obd1 conversion harness? Doesn't that hook to the pin outs going into the ecu itself? I am a wee bit confused. I am kinda new to wiring.

AHHVTEC · 10-14-2008, 11:45 PM

the o2 sensor has nothing to do with the obd. its just the way those ecu read the p08 needs a 1 wire the p28 needs a 4 wire, and thats goes for obd1 or obd2

philyphreak2127 · 10-14-2008, 11:52 PM

That sucks. I will have to go look and see if I will have to swap my O2 sensors..

tizok · 10-15-2008, 11:13 AM

i had a d15b vtec ina 91 civic 4 door... my very first car... i bought it for 600 hundred... and i beat my friend's 2001 honda civic dx coupe... i love that engine

HATCHET_HONDA · 10-15-2008, 01:17 PM

Quote:

Originally Posted by kg728

Hey, I need some help on a swap I am attempting to do... I recently bought a JDM d15b VTEC that I want to put into my 89 CRX HF.
I know I have to change the ecu to a p28 or a p08--I was wondering which one would be better--in order to get the vtec to work. Also, I want to know what other parts I'll have to buy to make the swap work and which ones I can just use from my current setup with the stock motor (d15b6). The motor came with the d16z6 throttle body, and I was wondering if I could use that, or if I'll have to use one from the d16a6. Or if I'll even have to change the whole intake manifold to the d16a6.
Will the distributor from my current motor work, or will I have to get another one? I was also wondering about the alternator and about all the senors...

Anyways, I was just wondering if any of you guys could help me out. Thanks!

i have a d15b in my 90 si hatch....you will need the dizzy for a d15b since its vtec. the d16a6 dizzy will not work. to wire it for vtec is simple....RYWIRE.COM has the obd0 to obd1 jumper harness with the vtec wiring already in place and its color coded so u just simply match the wire colors with the included instructions. i am using a p28 ecu with my swap with no engine problems other than stoopid emissions crap so it should work just fine

kg728 · 10-15-2008, 09:38 PM

Thanks for all the help guys. I just noticed though that the driver's side engine mount doesn't fit right though...

Does anyone know where I can find a mount for the engine that will fit my car?

10-13-2008, 11:38 PM	#1
kg728 Member Join Date: Oct 2008 Location: Tennessee Posts: 42 iTrader: 0 / 0% Ride: 89 CRX HF Rep Power: 3	d15b VTEC swap into 89 CRX HF Hey, I need some help on a swap I am attempting to do... I recently bought a JDM d15b VTEC that I want to put into my 89 CRX HF. I know I have to change the ecu to a p28 or a p08--I was wondering which one would be better--in order to get the vtec to work. Also, I want to know what other parts I'll have to buy to make the swap work and which ones I can just use from my current setup with the stock motor (d15b6). The motor came with the d16z6 throttle body, and I was wondering if I could use that, or if I'll have to use one from the d16a6. Or if I'll even have to change the whole intake manifold to the d16a6. Will the distributor from my current motor work, or will I have to get another one? I was also wondering about the alternator and about all the senors... Anyways, I was just wondering if any of you guys could help me out. Thanks!

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10-14-2008, 12:06 AM	#2
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 30 Posts: 11,633 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 349	use the po8, convert to obd1, and drop it in there nothing else needed other than running wires for vtec, and off you go

10-14-2008, 12:18 AM	#3
kg728 Member Join Date: Oct 2008 Location: Tennessee Posts: 42 iTrader: 0 / 0% Ride: 89 CRX HF Rep Power: 3	Thanks for the help! Are you sure I don't have to change the distributor though? Or the throttle body?

10-14-2008, 12:19 AM	#4
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 30 Posts: 11,633 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 349	no, just got to convert to obd1 and run wires for the vtec and thats it

10-14-2008, 12:20 AM	#5
kg728 Member Join Date: Oct 2008 Location: Tennessee Posts: 42 iTrader: 0 / 0% Ride: 89 CRX HF Rep Power: 3	Also, does anyone have an estimate on what power and gas mileage I'm going to get with the new swap? I have h/i/e mods...

10-14-2008, 12:21 AM	#6
kg728 Member Join Date: Oct 2008 Location: Tennessee Posts: 42 iTrader: 0 / 0% Ride: 89 CRX HF Rep Power: 3	Ok. Thanks! I'll get to work on it soon then, and see how it works...

10-14-2008, 12:24 AM	#8
kg728 Member Join Date: Oct 2008 Location: Tennessee Posts: 42 iTrader: 0 / 0% Ride: 89 CRX HF Rep Power: 3	Yeah, I know that much... I was just wondering if anyone had any idea how much the slight mods might give it.

10-14-2008, 08:25 AM	#9
philyphreak2127 The name's Sam Join Date: Oct 2007 Location: morrison, co Age: 20 Posts: 1,532 iTrader: 0 / 0% Ride: 98 civic dx sedan, 80 trans am Blog Entries: 1 Rep Power: 27	Not much. Keep in mind most of these horsepower ratings are unfortunely at the crank. So when it comes down to it you will really only be putting to the ground around 100 horses...If you don't mind me asking why would you swap out a z6 for like 10 more horsepower? Why not spend the money on the motor you have now? I too am going to swap a d15b in my car but that is only cause I screwed up another motor. :-( So the P08 is the right ecu?

10-14-2008, 03:29 PM	#11
philyphreak2127 The name's Sam Join Date: Oct 2007 Location: morrison, co Age: 20 Posts: 1,532 iTrader: 0 / 0% Ride: 98 civic dx sedan, 80 trans am Blog Entries: 1 Rep Power: 27	Oh my fault. I totally skimmed that paragraph and obviously missed a lot. lol Well that answers my question completely. So in that case swap it now!!!

10-14-2008, 08:09 PM	#12
kg728 Member Join Date: Oct 2008 Location: Tennessee Posts: 42 iTrader: 0 / 0% Ride: 89 CRX HF Rep Power: 3	Yeah, my current motor actually only has 65 hp and puts about 50 to the ground.. lol. It also has about 210k miles on it, and the clutch went bad, so I figured this was a good time to do the swap.

10-14-2008, 08:11 PM	#13
kg728 Member Join Date: Oct 2008 Location: Tennessee Posts: 42 iTrader: 0 / 0% Ride: 89 CRX HF Rep Power: 3	AHHVTEC, how do you recommend running the wires for the vtec to work?

10-14-2008, 08:29 PM	#14
philyphreak2127 The name's Sam Join Date: Oct 2007 Location: morrison, co Age: 20 Posts: 1,532 iTrader: 0 / 0% Ride: 98 civic dx sedan, 80 trans am Blog Entries: 1 Rep Power: 27	Probably not a bad time! lol

10-14-2008, 11:05 PM	#15
kg728 Member Join Date: Oct 2008 Location: Tennessee Posts: 42 iTrader: 0 / 0% Ride: 89 CRX HF Rep Power: 3	Btw, where can I get a p08 ecu? I'm having a really hard time finding one... I can only find the p28 ecu's...

10-14-2008, 11:23 PM	#16
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 30 Posts: 11,633 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 349	a p28 will work also i just like sticking to the ecu thats made for the motor, but just run the vtec wires to the proper pin out on the ecu

10-14-2008, 11:32 PM	#17
philyphreak2127 The name's Sam Join Date: Oct 2007 Location: morrison, co Age: 20 Posts: 1,532 iTrader: 0 / 0% Ride: 98 civic dx sedan, 80 trans am Blog Entries: 1 Rep Power: 27	I agree with sticking to the original ecu however I am also having a difficult time finding a p08

10-14-2008, 11:37 PM	#18
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 30 Posts: 11,633 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 349	me too lol,

10-14-2008, 11:38 PM	#19
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 30 Posts: 11,633 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 349	keep in mind if you use the p08 ecu you need a 1 wire o2 sensor if you use the p28 you need a 4 wire o2 sensor

10-14-2008, 11:41 PM	#20
philyphreak2127 The name's Sam Join Date: Oct 2007 Location: morrison, co Age: 20 Posts: 1,532 iTrader: 0 / 0% Ride: 98 civic dx sedan, 80 trans am Blog Entries: 1 Rep Power: 27	geez man if I didn't love working on my car I wouldn't be able to remember all this stuff lol. But does that apply the o2 sensors thing if I run a obd2 to obd1 conversion harness? Doesn't that hook to the pin outs going into the ecu itself? I am a wee bit confused. I am kinda new to wiring.

10-14-2008, 11:45 PM	#21
AHHVTEC Senior Member Join Date: Oct 2006 Location: Alabama Age: 30 Posts: 11,633 iTrader: 3 / 100% Ride: dc5,mk4 gti,2nd gen civic,92 accord cp,88 crx hf Rep Power: 349	the o2 sensor has nothing to do with the obd. its just the way those ecu read the p08 needs a 1 wire the p28 needs a 4 wire, and thats goes for obd1 or obd2

10-14-2008, 11:52 PM	#22
philyphreak2127 The name's Sam Join Date: Oct 2007 Location: morrison, co Age: 20 Posts: 1,532 iTrader: 0 / 0% Ride: 98 civic dx sedan, 80 trans am Blog Entries: 1 Rep Power: 27	That sucks. I will have to go look and see if I will have to swap my O2 sensors..

Hondaswap.com | Honda Technical & JDM styling Forums

d15b VTEC swap into 89 CRX HF

10-15-2008, 11:13 AM	#23
tizok Junior Member Join Date: Oct 2008 Location: Santa CLara CA Age: 20 Posts: 3 iTrader: 0 / 0% Ride: 1994 acura integra LS Rep Power: 0	i had a d15b vtec ina 91 civic 4 door... my very first car... i bought it for 600 hundred... and i beat my friend's 2001 honda civic dx coupe... i love that engine

10-15-2008, 09:38 PM	#25
kg728 Member Join Date: Oct 2008 Location: Tennessee Posts: 42 iTrader: 0 / 0% Ride: 89 CRX HF Rep Power: 3	Thanks for all the help guys. I just noticed though that the driver's side engine mount doesn't fit right though... Does anyone know where I can find a mount for the engine that will fit my car?