OPTIMAL dowel pin/cam drilling position on 4th gen vq35de supercharged
 

We are rebuilding a VQ35DE for supercharging, follow the thread and read until the end:
http://forums.maxima.org/supercharge...-thread-3.html

We were asked by the builder where to drill the cam for optimal dowel pin drilling on the cam to get the best out of static cam timing.

Any FI incomes would be appreciated (FI gurus)

you might get a better response on nycmaxima's, there a guy on there that made cam spacers just for boosted motors

I spent almost the last 2 hours on nycmaxima, looking for that info but with no result. :(


Anyone could help?

Thanks!

try asking vipervadim, secondtonone, tarvish and I think 98maxedout. I would shoot them a pm or post a thread on nycmaxima and line-it-up

The names maybe mis spelled alittle but you get the idea

I've ask the question twice on nycmaximas and also sent pms to tavarish and 98maxedout with no result... please help!!

If anyone have the answer, I'll have the intake cams drilled to 180* the stock 4th gen timming....

BUMP FOR ANSWERS...

try Tilley, Dandymax and Stephenmax

^ search 'cam timing' under posts by user 'Dandymax', he's got a post somewhere outlining the amount of advance for powerbands favouring topend or midrange with various amounts of advance. There really is no one answer for an 'optimal' position, but 180* probably isn't it.

Looking for an answer to this same question..

here's my $.02 about cams, cam adapters/timing, and cam timing control.


I (made)timed my own cam adapters for every 3.5L build I've done, using 3.0L ECU + EU for datalogging/Tuning.

My original template came from Rob's drilled cams (TILLEYS99) before adapters, I drove all the way to his shop in PA from NY to get a set.

I used a 3.5L head and degreed all 3.5L cams I could get my hands on (like I did with the headers)

I had 3.0 cams, 3.5 DE cams(my build), 3.5L rev-up cams(98Maxedout build), and JWT 260* knockoff cams(NYC32798 - RIP Mike)


there are different cam timings based on whichever cams you are using and whether you are going FI or N/A route.

for FI the cams are retarded several degrees to keep from ramping up static cam timing at 5300rpms+ past 22+ degrees (EU advances/retards cam timing based on RPM + boost)

for N/A the cams are a little advanced to get more N/A power across the RPM range and to help remove the 3.0L ECU timing hole at 3100-4200 rpms (the beauty of tuning ignition timing vs just a fuel trim VAFC tune, for all yall who still do not know)


now here's where it gets more complicated. stock 3.5L VTCs control cam's advance/retard based on rpm load and other ECU factors, that sweep in +/- degrees also varies between 3.5L DE and 3.5L rev-up (also advance/retard on Exhaust cams)

Rev-up cams have different lobe positions compared to 3.5L DE cams. so if you use a pre-made 3.5DE adapter with rev-up cams you're not getting the best timing setup for the rev-up cams.
^^same goes for JWT cams. so there is really no ONE SIZE FITS ALL adapters, that's why I took the time to spec them out and made my own..

I also used better grade metal and WELDED the dowel pins in all my adapters. 98maxedout had the very first rev-up cams with my 3.0L adapters in his white 4thgen SC'd max with over 400WHP(10psi) and hundreds of hard presses (built that motor and EU tuned it myself)

back in the day.. http://www.streetfire.net/videos/sea...x?t=98maxedout

unlike other mods you throw onto the VQ.. cams are of the biggest screwups you could make.. because we're talking about a Per Cylinder + Per Revolution engine impact.. (you can make more power, but you can lose power equally across all cylinders if you do not have the right cams for build, or your timing (overlap) specs + tune to offset your specific build are off)

headers intakes exhaust, etc do not have such a serious internal timed component +impact on how the engine runs, you bolt those other mods on and there's going to be more power even if you do not tune, with cams -- YOU MUST RESEARCH + TUNE based on final goal of build. (for all those who do not already know this) why run BC c9's if you're running a stock rev limit?


-------------------
this all much more important on a FULL 3.5L with VTCs which will advance/retard the VTC's own physical timing based on 3.5L ECU inputs.

so if you do not have control over your VTC maps.... you don't really have FULL control over your cams/timing, now do you??

all those 02+ turbo guys running out there without any VTC control.. when your tune needs to start retarding your intake cam timing after 5000+ rpms and then your VTCs start to physically advance the cams because it thinks you're N/A.. such a shame..

So, there is no confirmed "correct" place to drill the cams, based on standard configurations (FI verses NA, for example)?

My engine has the JWT cams, with forced induction, and I am at the point of making spacers, and looking for guidance on the correct position. Based on that, is there a recommended position?

Thanks.

Can you compare aftermarket cams meant for boost, such as JWT and perhaps you can get an idea of what to do. Good luck.