Need your opinions

**allan442** · August 9th, 2010 03:18 PM

Hi members! I'm thinking of having my D15b engine "port and shave" and later on i'll have a racing camgear? is it a nice thing to do? Thank you

**ghosthunter** · August 9th, 2010 03:24 PM

Originally Posted by allan442

Hi members! I'm thinking of having my D15b engine "port and shave" and later on i'll have a racing camgear? is it a nice thing to do? Thank you

No such thing as "nice thing do to" when you are modding for performance.

Best to have your modification path planned out in advance so your mods now will not be wasted by mods in the future.

**dr. d** · August 9th, 2010 03:37 PM

well, nothing is free. if you want performance, you can have it in exchange for engine longevity.

**niky** · August 9th, 2010 03:53 PM

Originally Posted by allan442

Hi members! I'm thinking of having my D15b engine "port and shave" and later on i'll have a racing camgear? is it a nice thing to do? Thank you

Are you willing to spend enough money to swap a B16A into your car to achieve the performance you want? If not, don't bother. It's much easier to swap in a Japanese D15B VTEC for extra power than to build up a local D15B.

A "port and polish" is one of the last items on the budget, and has the least effect on power... at least until you've fully built the engine. Best to have it done at a place that can flowbench the head and decide how much more flow you need.

A fully built local D15B (non-VTEC) will make quite a bit of top-end power, but it still won't be anywhere near as powerful as a B16A or a 2 liter engine with simple mods.

**allan442** · August 9th, 2010 04:04 PM

Hi Niky! Mine is already D15b VTEC japan. thanks for your input.

**niky** · August 9th, 2010 04:17 PM

Ah. Then if you're committed, go ahead. Just remember, once you've done all the simple things, every hp after will cost you much more.

Cams, camgears and P06 first. Then port and polish if you're not satisfied. The PnP has to be matched to whatever cams you get and your overall power gains and targets.

**isa1023** · August 9th, 2010 04:27 PM

Originally Posted by allan442

Hi members! I'm thinking of having my D15b engine "port and shave" and later on i'll have a racing camgear? is it a nice thing to do? Thank you

Do the IHE, racing camshafts and adjustable camgears before PnP. Then re-chip or piggyback the P08 ECU.

:devil:

Despite the SOHC layout, that is one rev-happy engine you can redline to almost 8000 on slight proper mods.

Then, if you want more evil, add high compression pistons and raise the compression.
:evil:

**allan442** · August 10th, 2010 02:06 PM

Guys thanks for your inputs. however i just want to know if after getting all these performance enhancements would it change my fuel consumption and if "yes" do you have any idea what's it gonna be?

**niky** · August 10th, 2010 03:19 PM

Originally Posted by allan442

Guys thanks for your inputs. however i just want to know if after getting all these performance enhancements would it change my fuel consumption and if "yes" do you have any idea what's it gonna be?

If you have to ask about fuel consumption, you don't want racing cams. Seriously. Expect a drop of around 1-2 km/l in city driving... much more if you go hog wild with cylinder head mods and over-port it.