Current setup is an ls6 with 243 ported heads, msd intake with 102tb, 1 7/8 long tubes, rotofab CAI, current cam is a comp 231/247 with .617 lift on the intake side and .623 on exhaust on a 115 LSA. Doing a little research it appears this was a cam designed to work with rectangle ported ls3 heads? Car makes good power, 455rw and 415tq, but it winds all the way to 7000 rpm and on the engine dyno peak tq was at like 6k rpm.

is there any power left on the table with another cam? is there something else that could make as much power but not rev so high? Anyway to bring the tq down in the rpm range?

 

Wow, I don't recall seeing an LS engine with those cam specs getting peak torque@6,000 rpm!! That's a screamer, for sure.

 

it was on an engine dyno... i can try to find the rw numbers

 

I doubt there is much to be gained with a different cam. If it's already in the car I probably wouldn't change it.

But if you do, go with something like a Cam Motion Titan 5, or maybe a BTR Stage 3 LS1/LS2 cam

 

any gain down low with a 112lsa?

 

It won't peak so late in the RPM range.

 

Yeah the 2 cams I listed will make more power in the midrange for sure.

 

probably wont make any more peak power but definitely could make more power under the curve with a different cam, youll want something with a little less exhaust duration and tighter lsa 112-113ish, intake duration and lift spec is fine

 

Good advice from several members. I don't know why so many people think a tighter LSA kills lower rev power. A tighter LSA will boost the lower mid-range and mid-range torque substantially, all else equal. Tighter LSA's also usually doesn't kill power rapidly when you rev past the power peak. The fall-off is more gradual......

 

Tightening the LSA up will increase the overlap. More overlap means less efficiency down around idle and tip in. More overlap can make tuning a bit more difficult and some idle/low speed issues may not be totally resolved. Generally speaking, the best all-around way to get more power under the curve and not give up any drivability is to simply put a smaller cam in it. Cam motion Titan 4 would be a solid choice. Once you get to Titan 5 territory, the cam will want 7500 rpm to make "Best" use of its power band, even though it would likely still have better mid-range than your current cam. Just look at the converter recommendation on Cam motions page between the 4 & 5. The 4 calls for up to a 4k stall, the 5 calls for up to 4500. Imo anything that wants a 4500 stall is going to want to be spun to 7500 rpm if the rest of the combination will support it.

 

Change to a 108 C/L with the same other specifications.

 

i like the cam... i was sort of thinking along those same lines.. same cam but 112 or 110 lsa

 

You can't just blindly tighten up the LSA without doing the math on PTV clearance. Keep that in mind on big cams.

 

gotcha. I was told the pistons had valve relief cut in before I bought it. They did a lot of work but didn’t swap out pistons or rods.

 

Everyone is focusing on the cam , but who ported the heads ? What are the valve sizes ?

a smaller cam will change the power curve for sure, but if the heads are running 2.1” /1.6” valves you might be optimized for that cam and higher RPM.

lot of people like the rec port heads because they shift the power band higher in the TPM and the cathedral make better power under the curve (till you start porting them)

another question I’d be asking is what the compression is. Upping the compression will make more power ever where and largish cams like the one you are running like higher compression.

got a Dyno curve ?

 

wegner Motorsport did all the work. I bought the car with everything already completed so not 100% sure. I have a book of receipts maybe the details are on them

 

Agree on idle and tip in. But we weren't talking about either. Few also spend much time at idle. From roughly 2,500 rpm up, a tighter lsa generally makes more torque/hp than a wider one. I'm talking say a 110° lsa vs a 114° lsa. It also wont fall off the cliff 500rpm past its power peak. But yeah, they can be Hell to tune. My tuner says anything under a 112° lsa makes him wanna go home early!!!

 

• if it were me, I’d be coming in those receipts looking for all the data. I also contact that company and ask them what purpose the motor was built for. Sounds to me like it was built to spin.

 

Any idea if the cam was installed "straight" up or advanced any?

Also, what is it going in, what are you using the vehicle for and what is the rest of the combo?
Weight?
Trans?
Rear gear?

It amazes me that people will throw out advice, and not even ask the BASIC questions that any cam manufacturer or engine builder would ask.

A dyno graph would also be helpful.

 

not sure. I have the engine graph but didn’t keep the mustang dyno sheet. It’s a 68 restomod with a 5speed, ford 9in and 4.10 gears. No idea on weight.