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[92CXyD]

I'm looking for a good basemap for a 3-stage vtec D15b or D15z7.

I searched all I can find is S300 maps and AEM maps in D-series.org

http://www.d-series.org/forums/engine-management/121398-d15b-3-stage-engine-control.html

[Joseph Davis]

You'll need to make one.

[92CXyD]

You'll need to make one.

I figured as much. 

I was thinking loading a p28 map in a p72 rom in Crome.

I'm using the first 12-16v actuation solenoid off of the IAB code.

Setting the IAB function in Crome at 3k.

Then find a d15z1 or y5 map and copy for 3k and under and past to p28 map.

Then set up the rest of the map above 3k revs like a normal z6 style map for boost.

Any other ideas?

[Joseph Davis]

Run a normal cylinder head instead?

[92CXyD]

Run a normal cylinder head instead?

No I want to try something different. ;D

[Joseph Davis]

The only thing different is the amount of hassle.  I was about to get one of those heads when I realised it was another small port head for a small bore motor, and the limit of the system was not in the cam/valve sizes.  I still want one, but it's not the "smart" spend of time and money that a normal person would seek out.

Ultimately, I realised one of those heads would run no better than a Z6/Y8, and the pinnacle of my discussions regarding all the time and effort I spent on seting one up would be teenage boys asking why I had two VTEC solenoids.  Kinda reduced my passion for the idea to ashes.

[92CXyD]

The only thing different is the amount of hassle.  I was about to get one of those heads when I realised it was another small port head for a small bore motor, and the limit of the system was not in the cam/valve sizes.  I still want one, but it's not the "smart" spend of time and money that a normal person would seek out.

Ultimately, I realised one of those heads would run no better than a Z6/Y8, and the pinnacle of my discussions regarding all the time and effort I spent on seting one up would be teenage boys asking why I had two VTEC solenoids.  Kinda reduced my passion for the idea to ashes.

I believe on the high rev. side it would run slightly better because of the stock cam specs.

reference: http://causeforalarm.thecarthing.com/version6/version6.EG/3-stage_VTEC/index.html

looking at the high cam lift ht.

I'm taking mine z7 head apart and look the cam. I got it from jdmhatchracer94 and he was told from the previous owner of this head that it already has a delta regrind in it.

As for the fuel and ign. maps I want to be able to drive to Seattle next year and get 45mpg+ and still get a good dyno run. ;D

[jagojon3]

A slightly more aggressive cam won't make up for tiny ports

[92CXyD]

A slightly more aggressive cam won't make up for tiny ports

You have no idea what you are talking about. That or you are think d15z7 = d15z1 in head casting.

D15z7 = z6/y8 port size. Matter of fact the d15z7 head is a y8 head with the extra oil holes drilled.

Y8 head can be drill to do the same thing beacuse the oil passages are already cast in them.

The cam follower assembly, cam, and LMA from D15z7 can be bolted on to the y8 head.

reference: http://www.d-series.org/forums/general-tech/119313-3-stage-vtec-comprehensive-info-d15b-d15z7.html

[Joseph Davis]

Without measuring anything or verifying figures, I'd be willing to bet Y5 cam is bigger.

[92CXyD]

Here is some port size picts I took during my lunch.

Z7 head


Y8 head


Z6 head


Did quick valve diameter measurements and they were the same.

y5 cam spec.
D16Y5        Cam Lobe Heights   mm   in
                           Primary    38.427   1.5129
                      Secondary   32.292   1.2713
                          Exhaust   38.784   1.5269

D15Z7        Cam Lobe Heights   mm   in
                           Primary   36.662   1.4434
                                Mid   38.274   1.5068
                        Secondary   32.29   1.271
                          Exhaust   38.008   1.4964

D16Y8        Cam Lobe Heights   mm   in
                           Primary   36.778   1.4479
                                Mid   38.274   1.5068
                         Secondary   37.065   1.4592
                          Exhaust   38.008   1.4964

D16Z6         Cam Lobe Heights   mm   in
                           Primary   35.900   1.4134
                                Mid   38.107   1.5003
                       Secondary   36.195   1.4592
                           Exhaust   38.008   1.4964

[Joseph Davis]

Yeah, tiny tumble flow D16Y ports.

And, those numbers aren't correct.  I know it's a different rocker, but the secondaries are not smaller than the primaries.

[92CXyD]

Yeah, tiny tumble flow D16Y ports.

And, those numbers aren't correct.  I know it's a different rocker, but the secondaries are not smaller than the primaries.

I pulled those from the first link I posted. I'll measure my a z6, y8, and the z7 cam tonight. I'm curious if the cam with my z7 head is stock or a Delta regrind.

I do not see much info rocker ratios for the y8, z6, y5, or z7 head on the web much. But I know I can just mathematically figure it out after knowing the gross lift.

[jagojon3]

You're wasting your time

[92CXyD]

"Delta Regrind" is below.                                 Stock                  Base Circle
D15Z7        Cam Lobe Heights   mm   in              mm   in                      mm   in
                           Primary   36.662   1.4434  36.662   1.4434           32.2     1.267
                                Mid   38.38     1.511    38.274   1.5068           32.4    1.276
                        Secondary  32.29    1.271    32.29    1.271              31.7    1.248
                          Exhaust   38.10    1.500     38.008   1.4964           32.9    1.295

Rocker ratios are the same as between y7/y8 z6 and z7.

1.60:1 intake
1.80:1 exhaust

So the Mid profile has been modified  for sure and the exhaust profile maybe. 

The cam looks in better condition than any of my y8 or z6 stock cams I have laying here in my garage.

[ApexSilver06MR]

crower!

[92CXyD]

crower!

Crower does not do 3-stage vtec cam. ;D

[HiProfile]

THe d15z1 timing wouldn't work correct anyways. It's based on a gas-saver TB/IM/Head, and I think the valve angle is different too. You'd probably need less timing than the z1, but a litte more than the 16-valve map from whatever motor the primary/secondary is closest to.

I'd say tune it like a y8 in full 16-valve mode, then add timing for partial throttle in 12-valve mode. Less air injested means lower peak cylinder pressure, meaning less density, meaning slower burn speed, needing more timing.

[92CXyD]

THe d15z1 timing wouldn't work correct anyways. It's based on a gas-saver TB/IM/Head, and I think the valve angle is different too. You'd probably need less timing than the z1, but a litte more than the 16-valve map from whatever motor the primary/secondary is closest to.

I'd say tune it like a y8 in full 16-valve mode, then add timing for partial throttle in 12-valve mode. Less air injested means lower peak cylinder pressure, meaning less density, meaning slower burn speed, needing more timing.

That sound like a good path to tune on. Thanks. ;D