Kamin

Ok, im planing to fully build a b20vtec in the next year or so and boost it. i already have the b16 head bla bla etc etc.
heres the meat of my question.
Because the itr cams are more agressive, would this hurt performance for a turbo motor? i heard this somewhere.

Ri5e

From what people say, it has more overlap and is more for all motor.... However, a guy that I nkow who's car makes 351 WHP @ 12 PSI with TYPE R CAMS, has no problems with them. Although, you will probably make more power with the GSR stock cams.

Kamin

thats what people are telling me (the gsr cams)
ill probably wind up using those
anyone else?
thanks BTW

Kamin

OH
can someone explain this to me?
the gsr cam is has a longer lift and duration than the b16 cam (there was an argument about this, its true right?)
why is that better than my stock b16 cams for turbo?

Kamin

ttt for morning people.

Ltech

I couldn't find the spec on these. But from what I heard GSR cams are better for turbo. I have a b16 and planning to run GSR cams. Anyone wanna sell their stock GSR cams? Hit me up.
jason phan

HXMan

Is this true??

vtecvoodoo

I couldn`t get the ITR cams dialed in right in mine. I switched to GSR and it was much, much better.

Ryan

Kamin

bump AGAIN
damn this forum is moving fast.

tonydatyga

lift and duration = good; more air/fuel
overlap = not so good; unburnt air/fuel under pressure (compression) exits

Not sure why but having dealt w/ more gsr cams, they're relatively easy to dial-out most of the overlap w/ a set of adj. gears. Aggressive na usually means more lift and overlap and maybe a bit more duration. Basically, under boost you want more everything but the overlap, take it how you wish.

turbopanda

I'm using ITR cams with AEM cam gears.. seems to be working fine for me..

fast[R]

I was told to go with itr cams too, they make more power, but like everyone said the overlap is not good, I decided on going with gsr's and stock cam gears

done

i hear at high high boost you want gsr cams!!!

just heard that somewhere

Kamin

thats what everyone says!
i heard it "somwhere"
anyone with PROOF of the gsr cams working better?

Rocket

The power band of a motor gets "exaggerated" with a turbo. So if the power hits later All Motor it will hit later with a Turbo and when it does it will hit a **** load harder.

Flamenco-T

My old setup :

I had ITR intake cam only on my GS-R
Stock timing, stock internal, stock everything..

256WHP and 188 ft/lbs of torque at 6.5psi with no EBC when I dyno it...

drag 3 and Greddy SP..

find a stock GS-R with drag 3 then make the comparison...

Kamin

ok
can someone explain a little deeper, overlap to me?
im semi confused
and nice numbers flamenco.

Flamenco-T

you haven't seen nothing yet..just wait one of these days, you'll browse honda-tech FI forum and saw my SN name is change...
actually I kinda believe good things can happens out of bad things....

Rocket

See this post for GSR cams vs.TypeR int./GSR ex.

https://honda-tech.com/zerothread?id=192103

HXMan

Overlap- Time that both the intake and exhuast valves are open at the Same time. Overlap lets boost blow right thru.

EE_Chris

Yep, thats basically it.

Overlap occurs on the exhaust stroke and into the next intake stroke. As the exhaust valve opens, the higher pressure exhaust begins to flow out. Taking advantage of this 'moving mass', we can go ahead and open the intake valve, while the exhaust is still open, to let that moving mass 'pull' in fresh charge before the piston begins descending.

When going turbo however, your already forcing the charge in there. Why would you want to force it out the exhaust?

Thats where the turbo/less overlap theme comes from.

Kamin

ok, so that being true the best setup would be to have the overlap removed with cam gears and use a huge intake cam correct?

HXMan

Well...ideally it would be nice to have custom cams that don't need to be adjusted. I am thinking a big intake and exhuast cam would be best.

Kamin

hah well if we were in an ideal world i would have a skyline.

itr intake and b16 exhaust should work fine then right?

tonydatyga

don't forget to dial out the overlap!! Otherwise you'll know you're pushing out unburnt fuel if you check you plugs and exhaust piping/muffler.