LSGunZ28

iTrader: (8)

Not that Im gonna get one, but if I get a T rex cam only ( no PNP) could my stock 347 bottom end hold up? Also would a 3.42 gears be decent with this cam?

and how much power would it roughly put out with full bolt one but no PNP

and what kind of springs should I use

If a T-rex wont work, whats the most power making cam that will?

Gauge

iTrader: (3)

I, personally, wouldn't go with the T-Rex if you want to keep stock gears. That cam peaks out pretty high, and I believe it's fairly weak on the extreme low end. If you went with 4.10's, you'd get much better performance and enjoyment from the cam.

Are you looking for peak numbers, the best torque curve, best times, a fun daily driver, or what? That'll help us answer your question a bit better.

LSGunZ28

iTrader: (8)

Whatever will make me faster in the 1/4 mile

I was thinking 224/224 with stock gears, But now that I think about it and after driving a 440 RWHP lightning Id rather have something faster than just a high 11 second car ( 224 cam) I want something in the low 11s or so. maybe even high 10s

LSGunZ28

iTrader: (8)

and just cuz the cam peaks out at High RPMs... what does that have to do with gearing?

SVThis

iTrader: (2)

because it is weak in the lower RPMS...the gear will help u get outta those low RPMs quicker

300bhp/ton

If you look at a dyno or read TR's info on the TREX it doesn't really come alive until 3500rpm. This means using revs below this it willl dirve like a pig. Tall gears require more power and take longer to run thru. Shorter gearing like 4.10 will have lower terminal speed in gear but will run thru them faster. Meaning less power required and faster accelaration, it will also help to keep the cam in the power band better.

I've not driven a Trex Ls1 setup, but expect it to be a little on the wild side and certainly not docile. TR offer a complete cam package with push rods springs and the like. That's the easiest way to buy it. You mau want to consider a ported oil pump though and if you plan to make use of the high rpms where this cam excels ARP head stud bolts would be a sensible upgrade also.

For street use a milder cam may offer more power over the rmps but not as much peak, so it would be esier to drive and live with. But you'd need heads in order to have the PEAK HP.

As they say its all swings and round-abouts. Personally I like extreme anti-social setups, so If I had a manual I'd probably go for something like the Trex 4.10's and all supporting mods. And possible some budget heads also.

SVT THIS

iTrader: (27)

The performance of a Lightning and a TRex f-body will be completely different. You will have ZERO of the low end grunt that the supercharged Lightning has. An unstalled, stock geared TRex powered car will be slower than a completely stock LS1. To hit high 10s with a TRex cam only you need a perfect setup. Full suspension, full bolt ons, built valvetrain, drop some weight, run 4.10 gears and a 4400 stall with some drag radials out back. With the off the line throw of the 4.10s and 4400 don't expect the rear end to last to long. Then, with the increased shift points with the TRex, don't expect the tranny to last to long. I have a 4400 stall and DD it. It is wicked, and does get annoying in stop and go traffic, but I can handle it. That being said, I'm also not running the largest cam on the LS1 market. From what I've read over the last year about the TRex, if you aren't willing to sacrifce a LOT, the cam isn't for you. Just by your question "what springs should I use with it", this cam isn't for you. I was all for it, even bought the damn thing, before changing my mind.

LSGunZ28

iTrader: (8)

I have a M6 FYI

cant I just rev anddump the clutch for takeoff? instead of gears?

shanev8

iTrader: (11)

no u need gears

LSGunZ28

iTrader: (8)

Ok...

now can someone help me with my LS7 clutch question in the manual trans forums?

BTW Im not gonna get the T rex, because I dont wanna put shorter gears ( 3.90 the most from a ford 9", when I swap a new axle and diff)

Screamer27

iTrader: (2)

I have a T-rex cam and 4.57 gears in a ford 9in. I originally had 4.10's when i got the cam, and it was a bit of a headache in traffic, but going to the 4.57 helped out quite a bit too. The biggest deal is having it tuned. This cam is not for the faint of heart. Next time you are driving normally, take a look and see what rpm you are driving at. If can-not drive under 2000rpm, except in 6th gear, otherwise the cam starts to surge. This is one of the big issues with mine right now, if I had 3.42 gears, I wouldn't even consider this cam. This thing is ment for 3500-7500rpm.

Cam02ss

iTrader: (8)

this was well said. i'm also running a t rex cam with heads and as stated..it's not for the faint of heart. i am currently haveing 4.30s installed in my 12 bolt to maintain my powerband better. the 4.10s weren't enough to make up down low

LS1IMPULSE

iTrader: (42)

+3 Ive got one its is exaclty like he said

300bhp/ton

Not being nasty at all but I think it would help you understand it a little better if you did a little research on what gearing is and it's affects.

In breif, Imagine trying to pull away in 3rd gear each and every time? You can add more revs but because more effort is required it will be a pain and slower compared to pulling away in 1st.

Changing the final drive ratio just allows the engine to rev thru its rpms range easier, and because of the shorter gearing means you will drive at higher rpms thsu using the operational range of the cam.

Stock engines are very happy 1500-5500rpm with a Trex it will prefer 3500-7000+rpm if you are outside this rpm range the cam will not generally be happy.

PREDATOR-Z

235/242, .646/.610 112+2 LSA
That would still need gears but will be a nice street/strip killer (headers needed and pro-tuning)

orangeapeel

iTrader: (18)

You have a stock 347?

DanZ28

iTrader: (5)

it's not stock if it's a 347 smarty pants .

orangeapeel

iTrader: (18)

That was what I was getting at.

z28misfit

iTrader: (3)

The power range on the T-rex is one of the reasons I decided not to go with it. I really wanted it but realized my car is not exactly a drag car yet so I decided to go with LG's G5x4 cam. Who knows, it might be pretty close to the T-rex though. Without knowing the specs on it I never will know, but it seems to drive fairly decent with 4.10gears.

DanZ28

iTrader: (5)

I think your right, it's probably very close to the TRex .

Dan