NC_jdmeg

I had a problem with my stock headgasket so I figured I would upgrade I have a d15 b vtec running 8 lbs and just put in a cometic headgasket its .075 thickness I believe, marked the timing and everything and now the timing seems to be off. Tried to change it a tooth and noticed no difference, also new gasket is leaking oil whole nother problem. Any help on why my timing is off or how to fix it would be amazing do I have to set it different because of the thicker gasket?

TheShodan

iTrader: (14)

Physical timing will always be off if you change to a gasket, because the marks are now in order. You must mean D16 VTEC as the D15b7 was a non-vtec engine

Hopefully you didn't use Copper Spray on the Cometic gasket because of the MLS material, and you went in specific tighten down order. if not, that could cause the leak very easily.

OEM headgaskets are the best thing to use on these, not to go thicker to lower compression so that you're "better for boost". Very common misconception.

NC_jdmeg

Ok fixed timing issue and now it just wont build boost as quick is this from lowering the compression with the thicker gasket or is tgere another issue any idea how to fix this would adjusting exhaust valves help?

NC_jdmeg

No I have a jdm d15b single stage vtec motor, yea im going to loosen then re torque bolts just to be sure.. but timing is fixed now I have a problem building boost as fast as I used to it seems like its not building at all at points

NC_jdmeg

I replaced my stock headgasket with a .075 thickness cometic gasket its on a jdm d15b vtec and noticed an increadible difference in a bad way it seems to take longer to reach my psi setting of 8lbs is this just because the lower compression or is there something else the only thing I changed was the headgasket and timing belt. Would advancing my timing help or adjusting exhaust valves? Any input would be appreciated

wantboost

iTrader: (2)

Thicker gasket equals lower compression...

NC_jdmeg

Yes I know but would it make that big of a difference on reaching my max boost level

LTCxD2B

Yes

redlinetuning

.075" is a big difference from .035". But definitely check for vacuum/boost leaks.