jeepfun_tj

Engine 98 TA Stock & manifolds 853 heads truck intake Goal 800~5700 rpms LOW END TQ 87 octane noticeable Lope Instant off idle response (all about tq and some lope (gmpp hotcam like) This is a 4x4 and is heavy!
4,800 lb weight w/ Big tires. How will this work out bone stock enginge,manifolds & exhaust minus cats??? Dcr? Am i ballpark? Thanks a Million!!!!!!!!!!!!!!!!!!
208/218 .554/.563” 112 lsa ***(going with 110LSA) +4 advance
Comp Cams XE/XE lobes
3707R/3712R HR112LSA +4 advance 106 installed intake centerline (going with 106)
Cam Valve Events 0.006 0.050 0.200
Intake Duration - ID 261 208 128 3707 XE lobe .554"
Exhaust Duration - ED 271 218 136 3712 XE lobe .563"
Lobe Center Angle - LSA 112 112 112
Intake Centerline - ICL 108 108 108

Intake Valve opens - IVO 22.5 -4 -44 BTDC (- indicates ATDC)
Intake Valve closes - IVC 58.5 32 -8 ABDC
Exhaust Valve Opens - EVO 71.5 45 4 BBDC
Exhaust Valve Closes - EVC 19.5 -7 -48 ATDC (- indicates BTDC)
Exhaust Centerline - ECL 116 116 116
Overlap 42 -11 -92 degrees

redtan

iTrader: (5)

Idk about noticeable lobe and instant off idle response especially on 87 octane.

jeepfun_tj

i am not that cam savvy so its a best guess for a cam.
Hope to get an idea on what point torque and hp should peek
Also hoping for a bit of a lope
i dont want to "Have" to always run premium gas
As im not savvy on DCR how would this work out an a bone stock 98 ls1 from an fbody
only swapping out the intake to use a truck intake and 208/218 110 l/s +4 advance cam??? Someone must have an idea...

Some one has to have an idea

99Bluz28

iTrader: (35)

I came up with about a 8.44 DCR. should work good, lots of trq, and run smooth!
FYI, that cam has to much negative overlap (-11*) to have any lope, and going down to a 110 lsa isn't really going to change it that much with the small 208 intake duration. You'll gain a little bit of DCR 8.56, and it'll have a little bit of a cam sound with having -7* overlap. Now as far as power band both will peak before 5700rpm. Roughly around 5200rpm with the 110lsa, and 5400rpm with the 112lsa.
I'd go up some on the intake duration if you want it to peak around 5700rpm.

jeepfun_tj

Thanks for all the info..my uninformed guess was way off.
i have a lot to learn! when i get a little better understanding on what all effects what ill stop back with something that we the newbies can learn from.
Thank You again

JakeFusion

iTrader: (7)

I'd do something much crazier... 221/228 LSL/LXL 108+4...

DCR of 8.44 but the IVC is ~35 degrees and the overlap is ~9 degrees. It will lope pretty hard and have a torque curve similar to a stock cam, but will come on just a tad bit sooner... just with a lot more power.

jeepfun_tj

Original Thought Process Went something like this~
cam only and ls6(cheap) springs only swap
off idle power and all about torque
Peek torque at close to 4,000 rpms
nice Lope the more the better
Com Cams xr259hr adv. 800 to 5,800 rpms (206/212 @ 112 ls) 2* advance
Sounds perfect but 2 things~
peek tq seems to be around 4,300 rpms and No Lope!
Next is the 062 Crane/vinci 210/218 .551 112 l/s 5* advance
a little closer on the lope but peek tq is prob around 4,700?
Took an educated estimate using a stock ls1 stock manifolds (truck) intakeand came up way off. 10 Will i have to go the route of even less L/S ?
As a newbie trying to read and ramp up my understanding my hear is spinning

99Bluz28

iTrader: (35)

Well if you're considering a somewhat larger cam, I'd first recommend a higher stall TC (2600-3k) .
217/224 110lsa +4, LSL/XE lobes.
DCR is about 8.39, IVC is roughly 34.5*, overlap is +.5* so you'll know it's got a performance cam in it, but it'll still run fairly smooth.

jeepfun_tj

i really love the idea of the 221 cam but it moves the powerband up and its not what im seeking. Looking at the 206/212 112 l/s cam tq pk @ 4,300
im still seeking to bring the tq peek down to around 4,000 and at the same time make it lope. i know this sounds Crazy and totally unconventional but assume its possible. starting to thing think "Slightly" lower L/S something like 109 or maybe even 108 i dont know and around 110 intake duration.

JakeFusion

iTrader: (7)

The powerband of that 221 cam is lower than the stock cam based on IVC. Don't just look at duration. Look at the valve events.

A 104 ICL is super early.