hotrodth

currently have a tsp 233/239. i like how it pulls from 3200 and up. but want that grunt down low. i like how hard my cam hits so id like to keep the sound just want alot mor off idle....any good ideas? im aware of the 228r just sure there are some big torgue cams out there

99Bluz28

iTrader: (35)

What the LSA on your 233/239 ?

JakeFusion

iTrader: (7)

EPS has a popular 226/234 113+2 cam... would make better torque and be good on the spray.

alans02z

iTrader: (9)

EPS 230 238 cam makes great torque and lopes. also the street sweeper ht makes great torque and likes the juice pretty well.

hotrodth

233/239 is on 112°

02TransAm/Batmobile

iTrader: (32)

I asked Pat G the same thing. Here is the cam recommendation he sent me along with my info:

Cam recommendation: 2002 F-Body with stock LS6 5.7L short block, 65cc stock 243 heads, LS6 intake, ported 78mm TB, M6, 3.42 gear, 1 3/4” long tube headers with no cats, 6800 rpm shift points, 7000 rev limiter, 150 shot N2O.
230/234 .600”/.609” 111LSA +3 advance (with 1.7 ratio rockers)
Comp EPS/LXL lobes 54-000-11 3 bolt cam core
13118R/13160R HR111LSA +3 advance (108 installed intake centerline)

I asked him to spec something for 350+ Torque at 3500 RPM, something that was nitrous friendly and I didn't want to shift too high in the rev limiter; hence the tighter LSA.

02TransAm/Batmobile

iTrader: (32)

Forgot to mention: I saw that you have PRC's, I don't believe it will fit milled heads so if you are interested in this cam, double check with Pat G.

hotrodth

that cam is smaller than the one I have...pistons are already flycut also...thanks for the info sir...

99Bluz28

iTrader: (35)

FYI, if you want the low-end you'll have to give up some top end. The EPS 230/234 111LSA +3 is a good option and so is a 231(lsl)/234(lxl) 110+3 or a 232/234 110+3 with xer lobes. You'll have just a little bit more overlap, 12.5*to 13*.

hotrodth

I don't mind giving up some top end. how and what does overlap effect.

02TransAm/Batmobile

iTrader: (32)

It's not all about big duration numbers. The Magic Stick is a pretty big cam but one of the worst down low torque cams there is due to it's low DCR/SCR. Bigger is not always better.

spicebird98

iTrader: (10)

what compression are you at right now and what cc are those heads milled to? what do you plan on shifting at? If you have the room for it a 231/238 .617/.615 111+3 on LSL/LXL lobes will love the juice and give you more lowend eventhough the duration numbers look similar to what you already have. I assume that 233/239 is with only 2 degrees of advance

hotrodth

I should be at 11-1 not sure cc on heads. I got them used. they have been cut .010 and Texas speed said I should be at 11-1....but who knows.I shift anywhere from 6500-800. but can shift lower if need be. the cam I have now was not degreed. or advance cut in. it was just off shelf cam on 112°

Sales@Tick

iTrader: (3)

Degreeing a cam is critical.

There is no point in a custom grind when you don't degree it in.

There are many different ways to look at this.

A cam that is a torque monster will probably have too much dynamic to safely spray a lot of nitrous on. Could it be done....on a small shot yes, on a larger shot it will depend on if you're willing to run the right fuel or pull the timing back so far that it runs without knock.

10 ways to skin a cat.

hotrodth

Martin I'm not understanding what your saying about the cam having too much dynamic.....comp? how will the cam affect the compression? also how does spraying a cam with more bottom end tq than what I have effect anything?.

SS10Tech

The cam will effect dynamic CR by looking at valve events of the cam. There are one of two ways to look at it - either the 0.006" location of the valve event listed on the cam card or the 0.050" measurement and subtracting 15 degrees which gives you the degree the intake valve is assumed closed in relation to the TDC for building pressure. The 0.006" measurement is assuming the intake valve is basically closed at this point and compression starts to build - it is also the better measurement as it takes into consideration ramp rates of cam lobes which are usually not symmetrical.

Nitrous shots require retarding the timing on high dynamic CR's and also careful leaning of the air fuel ratio. Too rich and you've got problems, too lean and you have problems. This is why it is always recommended to optimally tune an NA build before introducing NOS.

Sales@Tick

iTrader: (3)

Once again as he has done a lot lately SS10tech has beat me to the explanation

The total duration will determine what your dynamic compression is. The compression the motor actually sees while it is running and not stationary(static compression). The bigger the cam in duration the lower the DCR will be in a nutshell. Smaller the cam the higher the dynamic.

The reason small cams make great torque is due to them having a higher dynamic compression ratio which comes from closing the intake valve sooner than a larger cam would. Closing the intake valve sooner also will take away high rpm power and trade it for lower rpm power.

However while that is well and good, for nitrous you don't want to have too high of a dynamic compression ratio especially while running pump gas.

I can spec you out something that would work well, but some thought must be put into it and an off the shelf cam would probably not fit the bill here as the valve events in a set-up such as this one would need to be tailored to the individuals wants and needs.

Hope this helps.

stumprrp

iTrader: (2)

Ive always wondered how a small intake duration tight centerline cam would respond. The only one ive seen thats done that was "nitroused383" on here. Something like a 222/228 108+2. It would idle pretty rough but id think make pretty serious power down low, and die pretty quick up top.

But i'm no tech. Just a wannabe.

Sales@Tick

iTrader: (3)

Jason's cam(nitroused383) is an awesome cam. Brett Bauer spec'd it out for him and did a fine job.

It is actually 224/236 110+3 and is one helluva a performer.

We actually converse a lot(me and jason) and bounce a lot of ideas off of each other.

hotrodth

thanks for breaking down to dummy terms for me. that now makes a lot of sence to me. if you could help me find the right cam id appreciate it. its good to talk to someone w brains....makes me feel smarter lol