d15z6 questions

D15, D16, D17 and Mini-Me swaps
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d15z6 questions

By krunch
- Wed Sep 08, 2010 11:17 am #212746 hi, i still got a 1.5 but its now a d15z6 ... its a 1.5 sohc vtec. starting fresh so just looking for some good modifications to do to up my bhp.

so far:

white light weight spokes
fk spring and struts 60mm drop
cold force feed (hole out of bumper lol)

looking for exhaust system was going to go down to my local exhaust specialist and get them to make me one up manifold back. whats the better manifold? 4-2-1 or 4-1. de-cat or sports cat?

thats what i want to spend some money on next but my last civc eg4 was 4-2-1 manifold de-cat straight back to 4" jap boi box. was a little loud but i did enjoy.

this time round im looking for a more sports sound track only really loud when hitting the baby v tec lol

cheers!! :thumb:
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By krunch
- Wed Sep 08, 2010 1:19 pm #212763 D15Z6
SOHC VTEC
Found in:
Honda Civic 1.5 iLS (European Market)
Displacement : 1,493 cc (91.1 cu in)
Bore and Stroke : 75 × 84.5 mm (3.0 × 3.33 in)
Rod Length : 137 mm
Compression : 9.6:1
Power : 114 hp (84 kW) @ 6500 rpm
Torque : 99 ft-lb (134 Nm) @ 5400 rpm
VTEC Switchover : depending on load, max ~3500 rpm in 5th gear
Valvetrain : SOHC VTEC (3-4 valves per cylinder, depending on rpm)
Fuel Control : OBD2a PGM-FI MPFI
Ecu Code : P2Y
Head Code : P2J
Redline : 6800Rpm
Fuel cutout : 7200Rpmfdxxb

Thanks for your reply :thumb:
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By teal_dx
- Wed Sep 08, 2010 1:38 pm #212764 from the specs, it sounds like your engine is an OBD2 version of the D15z1 vtec-e motor we had over here in the states.
Same HP, lower vtec crossover depending on load, and 3 valve operation.
(Our OBD-2 version of the D15z1 was the D16y5 which also had those 3 features)

I'd hate to say it but that motor is not designed for high performance. It is designed for fuel economy. It is still better than a 1.5 non vtec motor though, but it's not going to have the potential of a D16z6 or JDM D15B due to lack of aftermarket parts avail.
I think those motors came with roller rockers though which is unique to the vtec-e heads.
The vtec-e heads are only meant to be compatible with the ecu meant for them since it controls the ~3500 vtec crossover based on load and the 3 valve mode (for a lean burn A/F ratio).

I've heard of people tinkering with these, trying regular vtec heads, with decent power results. But there's going to be a lot of time & tuning involved.

Did this motor come stock in your car or did you have to convert to OBD-2?
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By chrono404
- Thu Sep 09, 2010 3:33 am #212840 x2 on the comments from tealdx.

To answer on your question on exhaust.
4-1 normally gives you better top end peformance, while 4-2-1 typically gives you more mid range performance, which for your current engine is what you would want.

Just doing a simple search on google of "turbo vtec-e" i found quite a few people who Turbo charged the engine you have and got decent power while still getting awesome fuel economy. 1 person made 160hp at the wheel(not bad) and still can get 45mpg.

If you get the transmission thats attached to the performance vtec engine(our d16z6, a SOHC VTEC[not vtec-e, but real vtec]) that has the best accelerating gears for a D Series. We in the US call it the EX/Si Transmission as it comes on the EX Coupe/Sedan and Si Hatch. The Delsol Si has an even lower 5th gear for better acceleration. Its easy to get high 30mpgs with these transmissions. More if you have a gentle foot. The transmission upgrade will help out considerably if your looking for better accerlation.

The Other basic power mods are what your looking at, headers, intake pipe, and exhaust(2-2.25inches on N/A D Series)

There is a 3 stage VTEC Engine made in Japan that has VTEC-E, normal operations and then Performance VTEC. Its the OBD2 D15B. I'm not sure if that engine was released in Europe. It is the best D Series made and will out accerlate stock on stock any D16z6 or d16y8(US Market SOHC VTEC Engines) How to identify one of these is if you have 2 vtec solenoids, if you only have one then its not this engine.
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By krunch
- Fri Sep 10, 2010 10:17 am #213012 I did notice from my d15b2 the gear ratio on my d15z6 seems alot different not as get up and go unless reving hard...but thats what its there for!lol. seems to be alot longer ratio??

I think i will prob be putting the d16z6 box on it i think a mate has 1 laying around... im not a nutter behind the wheel just looking for the best options for the car i have, would do an engine transplant but its got low miles and seems a little nugget, plus im not overally skilled when it comes to that kind of work def a ROOKIE!!.

a freind of mine before had the same engine he had a dyno print out after he put a manifold, de-cat back system, short ram filter, performance leads amd a re-map and he got a casual 138bhp cant remember torq's.

seemed resonable enough for baby tec and d series power lol!!
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By kapow
- Fri Sep 10, 2010 11:14 am #213016
krunch wrote:I did notice from my d15b2 the gear ratio on my d15z6 seems alot different not as get up and go unless reving hard...but thats what its there for!lol. seems to be alot longer ratio??

I think i will prob be putting the d16z6 box on it i think a mate has 1 laying around... im not a nutter behind the wheel just looking for the best options for the car i have, would do an engine transplant but its got low miles and seems a little nugget, plus im not overally skilled when it comes to that kind of work def a ROOKIE!!.

a freind of mine before had the same engine he had a dyno print out after he put a manifold, de-cat back system, short ram filter, performance leads amd a re-map and he got a casual 138bhp cant remember torq's.

seemed resonable enough for baby tec and d series power lol!!


Well your saving money on fuel! I'm jealous
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By krunch
- Fri Sep 10, 2010 11:21 am #213019 lol thats one way i could look at it :lol:
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By kapow
- Fri Sep 17, 2010 5:47 pm #214172 Dude, always remember never say never. Bisimoto have managed to squeeze out 700hp from a d series engine. Possibilities are endless
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By Eg6H2D
- Fri Sep 17, 2010 10:35 pm #214211
teal_dx wrote:from the specs, it sounds like your engine is an OBD2 version of the D15z1 vtec-e motor we had over here in the states.
Same HP, lower vtec crossover depending on load, and 3 valve operation.
(Our OBD-2 version of the D15z1 was the D16y5 which also had those 3 features)

I'd hate to say it but that motor is not designed for high performance. It is designed for fuel economy. It is still better than a 1.5 non vtec motor though, but it's not going to have the potential of a D16z6 or JDM D15B due to lack of aftermarket parts avail.
I think those motors came with roller rockers though which is unique to the vtec-e heads.
The vtec-e heads are only meant to be compatible with the ecu meant for them since it controls the ~3500 vtec crossover based on load and the 3 valve mode (for a lean burn A/F ratio).

I've heard of people tinkering with these, trying regular vtec heads, with decent power results. But there's going to be a lot of time & tuning involved.

Did this motor come stock in your car or did you have to convert to OBD-2?


AKA (Suspended Hatch..) Lol..
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By 95CivEg
- Sat Sep 18, 2010 6:53 am #214299 bisimoto FTW!!! :thumb: :thumb:

By BlueVic_8354
- Thu Sep 30, 2010 9:15 am #215985
kapow wrote:Dude, always remember never say never. Bisimoto have managed to squeeze out 700hp from a d series engine. Possibilities are endless


wow! 700hp? that's awesome...

By AutoXCivic
- Thu Sep 30, 2010 12:50 pm #216016
BlueVic_8354 wrote:
kapow wrote:Dude, always remember never say never. Bisimoto have managed to squeeze out 700hp from a d series engine. Possibilities are endless


wow! 700hp? that's awesome...


Also remember that 700 whp isn't the impressive part. Someone else managed to get 700+ whp out of a D before bisimoto did (I think a year or so ahead of him). The impressive part was that he did it on PUMP GAS, with all commercially available parts. Nothing on that build was a one off.

And just for emphasis 700+ whp ... on PUMP GAS.
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