ok i got a jdm d15b 3 stage vtec motor its installed and running beautifully. its wired for both solenoids to hit at 5k incase anyone is wondering with a p70 ecu i believe (have to double check) it is a p2j head for sure though (y8) and was going to get the ecu chipped to get a little more power and eliminate the knock sensor cel but my main question is, is there a cam i could put in to make some more power before i chip it? also looking for complete valve train upgrade. wanna build the head for future boost. any info appreciated been searching online and cant seem to find any 3stage builds on what im looking for.

 

Everyone that I've seen with that motor has used it as it is for what it is. Fuel economy and a little pep. Because of all the extra lobes, I don't think there were any aftermarket cams made for it, you would have to get a set custom ground and that is really expensive.

Also why are you activating both solenoids at the same time. You really need to use a full Hondata S300 system (avoid ebay for this, lots of fakes out there) and have it program and tuned to operate each stage properly.

The best scenario was a guy who used a remote turbo and Hondata S300 with that motor who was getting 55 MPG and had plenty of pep when he stepped on it. He had the thing fully tuned so every stage of the motor worked flawlessly as it was supposed to.

Aftermarket parts such as cams for that motor are non existent, it's got 4 sets of lobes, regular SOHC vtec has 3 while a regular SOHC non vtec has 2 sets.

What I think you are doing is running it like a regular 2 stage vtec motor and even then on an rpm switch not a load switch. So not even running it efficiently.

 

Not sure how exactly its wired up I know it was wired through the existing wire harness though. It was put in by a shop and they do good work, the.car runs great and is peppy as hell compared to what it was before with the old dying b7. Honestly I love the motor how it is I can step on it and it pulls hard but just wanted to build the head and then the.bottom for small bossy. From what I gather is I'd have to find a po6 head if I really wanted to build it?

 

chipping with out tuning is lunacy.

Too many fly by night tuning programs out there with no concrete dyno results...
I.E. you buy a chip and they guarantee 20hp... how do you know you are actually getting 20hp?
One way to find out......... DYNO!
Reputable shops like hondata acutally post dyno results for their products.
In the small print there is also a disclaimer. results may vary.
It always is in your best interest to have the car dyno'd when adding any product such as a chip.
To see if the device is giving you what you paid for and to make sure you dont implode it.

just food for thought... peppy... how much of that is placebo?

 

Ppl who would be chipping it is an actual shop who knows what theyre doing, not gonna just buy a chip and put it in that is crazy lol and it really is a lot peppier than the b7 it pulls hard and and.goes when you want it. It may only have about 23 hp difference compared to the b7 but it does make a difference. I dunno I think everyone thinks of this motor as a eco motor (which yeah kinda) but it still makes the same power as a z6 or y8 and right now its not being ran as an eco motor and its fun lol

 

There are alot of shops who claim they know what they are doing..
Does the install include tuning?
Will there be any dyno slips to show before, and after?
Im curious to see them. 23 hp is pretty high a claim/gain.

 

OP just enjoy the mpg and save your money.

 

The 23 hp is the stock gain compared to the b7 without the chip. they let my ride around with a chipped ecu though to see the dif and it was a lot better but right now I'm just useing the stock ecu the motor came with, and yeah they do have a dyno at the shop. May just chip it and build a po6 head later as well as some rods and pistons down the line

 

Until i see a dyno slip showing a before and after 23hp gain i dont believe the claim.
You can ride around all you want and say you notice a gain but the proof is in the dyno results, not in your opinion.

Just what kind of "chip" is this? how much does it cost? who makes it?
I dont see 23hp coming from any chip in that car with that engine, nor in one you plan to modify later.
I defer back to my original thought... Placebo.
You were told therefor it is...big big misconception. believing all that you are told.

 

No chip I'm talking about the b7 compared to the jdm d15b

 

ok i gotcha now... my bad!

 

Lol no prob I'm just sayin I'm gonna chip it dunno what the gains are gonna be yet but this motor compared to the stock b7 are like night and day lol

 

Ok so as far as boosting anyone know what kind of pistons and rods that would fit this block? May build a z6 head to go with or boost it with the current head but would love to at least get some better bottom end parts

 

Someone has been able to boost the d15b, 250hp and got 50+mpg. The way he tuned it is really interesting. Unfortunately no one has that map and its long been sold. He kepted the head stock and just rebuilt the bottom end. It was clean and you didn't even see the intercooler. Very stock looking on the eg hatch.

 

You're getting in over your head at this point. We've gone from a simple ECU/tuning question to full blown turbo build...

Why are you building it?
Does your power goal justify building it?
What is your power goal?
Budget?
Goals for the car/Setup?

If you actually plan to entertain the idea of turbocharging it, do yourself a favor and read through the Forced Induction FAQ...then save $3-4k to do it correctly (and thats excluding the engine build)

The D15 is a pain in the *** to build since the rods are different length than all the common D16 aftermarket rods. To add to that, you have the cam issue...all in all, bad engine to boost. A straight Z6 would be much easier and cheaper

 

Nothing major maybe 250-275 and will probly change out the head, as far as bottom end though I've read the rods are the same 137mm mayb I'm wrong I dunno and the pistons are dished other than that they're practically the same not 100% though

 

Than it was pointless in getting the 3 stage vtec if you're changing out the head........GOOD DAY.

 

Well not changing it out right now and I may keep it and just do a mild turbo build if I can find the right rod/piston combo, I'm not even using the 3 stage as it is any way its all wired to hit at 5k

 

only problem about this is you will only be able to use the stock cam or have someone custom regrind the cam to your build needs...which isn't going to be cheap or cost what u can have a y8/z6 cam for...this motor is definitely not a desired block to build or boost... just enjoy ur MPG and build a z6 motor on the side to boost. the parts will be much easier to find...these parts are proven unlike a shot in the dark it will be with the d15b...

 

You must be lagging before 3k, I don't even have mine wired up and it runs like a CHAMP.

 

I was going to suggest a custom regrind of the cams from bisimoto himself, I read on d-series that someone did that with there 3 stage vtec cams but it was heavy dough, still the guy was willing pay to play.

 

Car runs beautifully even below 3k you wouldn't even know it was a 3 stage if you drove it and didn't know what was under the hood. So I guess ill just be looking for better measurements for the bottom end to see if I can build that up