The Camshaft Mega-Thread!

[killedbydeath]

Quick reference of Turbo and Cams to choose.

T25...Stock, 256/256T28...Stock, 256/256, 256/264GT28RS....256/256, 256/264, 264/264GT2871R .64.....256/264, 264/264GT2871R .86.....264/264, 264/272, 272/272GT3071R .63.....264/264, 264/272GT30R.....264/272GT35R.....272/272.

My plan for my sr, is about 300-350 whp, my thoughts are, upgrade my cams first then turbo and tune after. What I would like to know is the stock profile numbers, I was thinking 256/264 setup.Being I'd like a nice street powerband, not too high in the rpm's, and goal of 14psi.How will this work running a stock t25?.... Not saying I'd reach 300 out of the t25..What kind of powerband should I expect from these cams with both the t25 and the t28rs I plan to upgrade to down the road? Any help would be greatly appreciated

[killedbydeath]

Keep in mind I'm running full 3" exhaust, FMIC and I'll have all fuel upgrades taken care of come time for the turbo upgrade, I hope I'm not being too confusing.

[idahotuner]

well i will be running 264s with a t25 for my engine break in. since they are the only cams i have left over from my 1st build. it should be interesting to see how they interact.

of course i am 2.2 liter and 9to1 compression with greddy intake manifold and full three inch exhuast. i ma not sure exactly how the cams will play out with the t25. i hope to make 10 psi by 2500rpms but weather the cams move that around we will see. and will have a z32maf and 440cc injectors or maybe 550

[idahotuner]

PS. IDAHOTUNER!!! Whats up bro?

Modified by tokendog at 9:18 AM 11/15/2009

not much been working on my motor. my laptop went ca poop so i dont have aim. using my sisters. check out my new build up. zerothread?id=404493

[killedbydeath]

The only thing I can see it effecting is spool time, it should spool sooner and give it a broader powerband.. What I don't understand is this talk about differentiating the intake and exhaust cams for different powerbands.. Ie

If your using 264 exhaust can for top end power, and say a 256 for low end, why is it being treated as if you're running more power in the higher range of the rpm's.. 256 is the same rate at 3k rpm as it is at 6k, same goes for exhaust cam.. Can someone clear this up?

[idahotuner]

i heard about bigger cams making your turbo spool faster something i need to do some research on

[OM3GA]

Whats the most aggressive cams youd say would be ok on a stock valvetrain in an s13 sr?

[killedbydeath]

if nobody knows WTF their talking about than I'll look elsewhere and jumpTo my own conclusions, thanks for the input.

[yoki-yoki]

how aggressive are the 264 bc cams and what do the normally idle at

[idahotuner]

how aggressive are the 264 bc cams and what do the normally idle at

mine idled right at 800 rpms. but man third gear around 3500 they open up and its narly

[yoki-yoki]

mine idles around 1200 to 1400 but i also have the following add ons is that some what correct to idle that high

GARRET BALL BEARING GT2871R .86

SARD 850CC INJECTORS

isis intake mani

z32 maf

rom tune

[idahotuner]

thats weird. i had the gt2871r .64 264 cams z32 maf and 740 cc injectors and it idled right about stock. on a enthalpy tune

[S14toRPS13]

If your using 264 exhaust can for top end power, and say a 256 for low end, why is it being treated as if you're running more power in the higher range of the rpm's.. 256 is the same rate at 3k rpm as it is at 6k, same goes for exhaust cam.. Can someone clear this up?

Just thought this would be good info for this thread. It's an explanation on how longer duration cam effects rpm characteristics. I'm not taking any credit for the below explanation. This was explained by Michael Ecker.

Overlap is the time period when both the exhaust valve (trying to close) and the intake valve (starting to open) are open at the same time. The exhaust valve needs to stay open after the piston passes Top Dead Center in order to use the momentum of the exiting exhaust gases to maximize the amount of exhaust gas pulled out of the cylinder. The intake valve opens before Top Dead Center in order to use the momentum of the exiting exhaust gas to start pulling the intake charge into the cylinder. Too large of a lobe center angle can result in too little overlap to make good power. Too little overlap causes two things: lack of full expulsion of the exhaust gases and less intake charge filling the cylinder. Smaller amounts of overlap produce a smoother idle and a slight benefit in top end horsepower. This effect of overlap on performance is directly linked to RPM, as higher engine speed causes greater exhaust gas velocity, which relates to greater momentum of the exiting exhaust gases. This is one of the reasons that a longer duration cam produces power higher in the RPM range - the overlap period is longer requiring higher exhaust gas velocity for this momentum effect to occur without allowing excessive amounts of exhaust gases to enter the intake tract or to allow the exiting exhaust gases to pull the fresh intake charge right through the cylinder and into the exhaust system. Both of these events cause the loss of bottom end power and economy that large cams experience, however at higher engine speeds these are minimized due to the slight lag time it takes to get the intake charge moving into the cylinder.

To read the entire page click on this link:http://tru-442.tripod.com/camselect.htm
Modified by S14toRPS13 at 7:19 AM 2/14/2010

[maverick06xx]

alright i have the following mods,

Built bottom end

Going to get done...
Head ported and polished
3-5 angle valve job
supertech 1mm oversize intake Nitride valves
supertech 1mm oversize exhaust Inconel valves
bc valve springs and retainers
greddy RAS

Now i dont know what cams to get or turbo, i am shooting for 425-450whp
The turbo i currently have is a AGP Turbonetics Delta 48 with A/R .63
I am going to sell the turbo but not sure what turbo to get. if this turbo doesnt sell i will run it till i buy a new one.
I need ideals on what turbo to run, and also need to know whats the max rpm i can shift at without breaking things.
I was thinking the GT35r and 272 bc cams. I can get a good deal on the BC272 cams i wanted to take full advantage of this head since all this work is done, but not sure where i can safely shift gears and not sure what turbo to use...i'm wanting a power band from 4-8k if possible...any help would be great...

[maverick06xx]

alright think i figured it out, i want 450whp max, what do u guys think of this setup...
isis intake manfold port match
peak boost top mount manifold port match
Head ported and polished
3-5 angle valve job
supertech 1mm oversize intake Nitride valves
supertech 1mm oversize exhaust Inconel valves
bc valve springs and retainers
greddy RAS
bc stage 2 264/264 cams
All on a gt3076r turbo

can i expect to hit 450whp and shift at 7500? looking for a power band of 4-7500 rpms let me know...

[PyR0NiAk]

Your goal is right around the same as mine but with a slightly bigger turbo and slightly smaller cams. I'm running JWT S4 cams (268/268) and a GT3071 .86 AR. The big thing that's going to affect the ability to make 450whp is your fuel setup. I'll tell you now that 740s won't do it safely, and I'm not going to attempt it with my 810s.. I definitely recommend you go with 1000cc and a AEM EMS or a PFC...

[maverick06xx]

hmm is ur head built like mines? also what cams do u suggest? and i think 800 something cc should be able to do it, what u think? i want a good mid to lil top end car....good power and good trq if i can...i have the greddy ultimate emanage ecu and got it for dirt cheap...this should get the job done..also how much are those cams

[maverick06xx]

after doing some research i wanted to know if anyone here had bc 272 cams and a gt35r turbo whats the power band like? i think i may go back to doing this setup to reach 450 whp

[maverick06xx]

Your goal is right around the same as mine but with a slightly bigger turbo and slightly smaller cams. I'm running JWT S4 cams (268/268) and a GT3071 .86 AR. The big thing that's going to affect the ability to make 450whp is your fuel setup. I'll tell you now that 740s won't do it safely, and I'm not going to attempt it with my 810s.. I definitely recommend you go with 1000cc and a AEM EMS or a PFC...

I looked around and trtied to find the JWT s4 cams and it says its 266/266 and 0.464" LIFT

The stage 2 bc 264/264 is Lift (in): .475"/.475" seems to be more aggressive...and bigger

[maverick06xx]

Hey i just saw spanishricer old setup with the gt3076r, and saw he used the hks 264/272, and was curious as to why? i'm thinking of running this turbo but i wanted to know what cams i should use, bc stage 2 264's or bc stage 3 272's. the bc stage 2 cams are bigger then the setup he ran...

[idahotuner]

just so you know a gt3071 will make more useable power in the 400-450 range. the gt35 you will want tomie pon cams and solid lifters and rev out to 9 grand, but wit ha gt3071 and 272 cams or even 264s you will make the power between 4-8000 vs the gt35 will be 5 to 9000
personally i would a run a gt3076 .63 and 264 cams for 450, but then i have a 2.2 liter to make up 10% more power and 10% faster spool.

[maverick06xx]

idahotuner, man i'm glad u cam in and shared some info, i just ordered my bc 272/272 cams ($285 shipped a sweet as hook up) and supertech 1mm oversize valves (inconel and Nitride) got those for same price as regular oem valves which is a steel with free shipping. So with this build and with the cams, ISIS intake manifold, peak boost manifold, cams, and valves do u think i can hit 450-500whp with a gt3076r with an .63 or a .82 ar? i want to rev to 8k at most and would like a power band from 4-8k rpms would be perfect for me...how do u think the spool will be like? should i get the .63 turbo for a quicker spool or should i get the .82 to reach that power goal? ill also be running a 38mm tial wg external...

[idahotuner]

i would do the .63 if it was me.

on a side note my sr22 spooled my gt2871 .86 to 5 pounds of boost by 3000 rpms

[maverick06xx]

idahotuner do u think the .63 will spool quick and pull all the way to 8k or atleast 7500rpms? i dont even know what gt3076r to get now...lol any suggestions? still debating if i want to do v-band i think that way it wont leak as much...

[idahotuner]

do the .63 its will spool quick and make good power i nthat area. look for the mazworx kit. they have a thread on zilvia where they make some narly power at 18 psi.

[PyR0NiAk]

Sorry for not getting in here any sooner. I'm in Yuma for the month, so my NICO time is limited until early November when I get back to NC. It seems idaho has you on a good track. Anything from Mazworx or Tomei is pure quality.

[idahotuner]

Sorry for not getting in here any sooner. I'm in Yuma for the month, so my NICO time is limited until early November when I get back to NC. It seems idaho has you on a good track. Anything from Mazworx or Tomei is pure quality.

tell me how is the 4:10 in yuma lol

yeah now i am actually making a decision for myself. picking up a gt3076r. not sure what ar to go with thinking .63 but the .82 could be good and have more potential for power on pump gas, but less torque and response. but also thinking baout running a twinscroll housing ona non twin scroll manifold for now. then switching it to twin scroll later.

[PyR0NiAk]

Sorry for not getting in here any sooner. I'm in Yuma for the month, so my NICO time is limited until early November when I get back to NC. It seems idaho has you on a good track. Anything from Mazworx or Tomei is pure quality.

tell me how is the 4:10 in yuma lol

yeah now i am actually making a decision for myself. picking up a gt3076r. not sure what ar to go with thinking .63 but the .82 could be good and have more potential for power on pump gas, but less torque and response. but also thinking baout running a twinscroll housing ona non twin scroll manifold for now. then switching it to twin scroll later.

I know you went to a bigger bore and I'm pretty sure you went with the 9:1 compression right... Did you go solid lifters? If so go with the .82... IMO, you'll spool plenty fast with your setup...

[idahotuner]

no still have hydraulic lifters . but yeah 9:1 compression. i am thinking .82 would be the best option.

[PyR0NiAk]

Definitely, but if you ever make the change over to solid lifters, (I'm sure you will.) then you will really get to use it's potential.