So I found a stock LS7 takeout for my car and put a deposit on it. At first I was just going to drop it in as-is, but I've been down this road before. My car isn't the best with traditional LS power delivery with smaller cams. Too much of a lump of low and mid-range torque, and not enough up top.

My deal I'm looking for something a little non-conventional. Would be open for input. I want to keep overlap minimal, ~5*+/- a couple degrees at .050" for minimal idle aggressiveness - looking for a smooth relatively stealthy idle (like sit next to CA police in traffic stealthy) around 900-950rpm, but tailor valve events for 4000-7500rpm operation. Engine is going in a 2800 pound, 6 speed, 3.90 gear mazda rx7 to enjoy on the street, and flog on track and in the canyons. Stock ls7 intake manifold for now w/ potential to change to holley sniper low pro or maybe an MSD in the future (both have hood/firewall clearance issues so it is not an immediate priority), 1 7/8" headers w/o cats, unrestricted intake tube, 10% UD pulley, RPS carbon clutch.

In internet speak, stage 1 overlap w/ stage 3 powerband is the goal. My priority is to shift the powerband up and carry torque at high rpm. I want usable traction and high rpm performance with a broad powerband to give it more of a sports car feel.

Valvetrain will be stock Ti intakes, stock exhaust valves, stock rockers, stock lifters, and unsure on valvesprings - still researching what works best with the ls7 installed height. The heads were gone through 10k miles ago. I prefer not to take the heads off.

I will be grinding Comp's new low shock hydraulic lobes.

This is what I've come up with so far. 234/247 118+3, .647/.650" lift w/ the 1.8 rockers.

What valvesprings do I need that aren't too expensive, work with stock lifters, and the taller ls7 installed height?

Would this also work with the short runner Holley Sniper low pro?

 

When and if using a shorter Runner intake you can stand to lose a few numbers on the intake duration to get some Tq's back....

Springs look at Comp...

 

I have this in my 6.2 with LS7 heads and a stock LS7 intake.
230/246 .644"/.630" 115+4
https://briantooleyracing.com/btr-ca...-33146154.html

It idles nice and wasn't difficult to tune. I also live in SoCal and have not had any trouble with LEOs.

 

I was going to recommend the BTR Stage 2 ^^

I had the Stage 3 as my first LS7 cam and I absolutely loved it. Had power everywhere, pulled nicely to 7k and the idle sounded great (but more aggressive than what you are looking for). I'd bet the Stage 2 is exactly what you are looking for.

 

Forgive me if I should know this … what gen RX-7? FD? FC?

I love my Miata, but in some ways, an RX-7 swap makes a better finished car. I like convertibles, though.

 

FD rx7! Handling character is more playful like a Miata, and my experience is it puts power down better than vettes.

The btr stg 2 is my backup plan if I can’t get a cam ground fast enough, but I’d like to have something a little more top end focused and a touch less overlap. I have considered installing it retarded 4*.

 

Have one made just for the Ole: FD RX Ls7

 

Cam Motion has some PD blower cams that would fit your bill. They should kill some low end and scream up top. How available they are is another story. The last two custom cams I ordered from CM arrived within a week of when I ordered them. Apparently, that's not the case now.

 

This answers the question exactly! I’ll be looking into it. I have the same problem, LS has too much low down torque for a light rwd RX7 imo. I’m top 5 in circuit track events, but mid field in hill climbs with the standing starts. Part driver of course, but part engine dynamics as well.

 

It's all about the use of the engine and vehicle. Most just go off of the avg answer.

 

The trouble is that a cam with shitty low end torque usually also has shitty low end driveability. OK for a track car, not so hot for a street car.

Traction control or some restraint on the throttle is called for. Even if you can’t use full throttle until 3rd gear, it’ll still be quick enough to see off anything but a tubbed purpose built drag car. You built an RX-7 because you wanted a fast *sports car*, not a drag car.

All JMHO, of course.

 

duh....
Davis traction control, with Holley efi....

All this money and no knowledge of????

Free game...

 

Spanks ☝......Rowdy and lil John laughed like a **** on that 1 like a 15° degree head vs 13.5

I skipped class with a 9th grade GED... never flunked a class even with the Apache...or surgical school.


A engine was funny. It shows who knows what just on the principle...or the Formula which I know you know..

Design your own cam with help from Darth ...game over!
No need 4 a thread cause you already Know what's needed and wanted. Know that I'm
Lmao ...🤣 Spanks cause you know. Skip the bs Gang.
Stay under .700 and enjoy..

Nothing better than saying I speced this b!+%# ...i didn't need the or a guy... I know the formula Myself. Elimination of BS, money and a name. Just do the work asked 4.

 

Bump 4 the edit..

1 thing I learned here is ...you can spend for a hp number/ gratification or learn it for self and design it for self.
skip A guy and you know this Mannnnnn.
guys run from other Forums cause there formula was a Lie and it's cost... same G's over there also be here.. besides the Ole heads who said... 🤣

But there not here cause of newbies who think.. 🤣
Brainwashed vs a sale. 🤪

 

Last of a Dying Breed present

 

Jesus, me and a engine Talk all the time. We talk on anything thought about to eliminate cause if He with me why do I need any other ____.
make what Ever you think or dream crew and you Know Who to talk 2 or contact..Why a Lame question?


🤣x infinite

Day off after 3wks of 12hr shifts and Smoking.

 

Key word here.....

 

While I do agree with you that a more well rounded cam along with some right foot education would be better, there are cams available to do just what the OP wants. These three from Cam Motion wouldn't run rough on the low end in a 427 by any stretch. Maybe a little lazy down low, but not rough. More top end oriented. Lift would be higher on these with 1.8 ratio rocker arms.
PD 228/242 LS Supercharger Camshaft (228/242-118+4) for Positive Displacement - Cam Motion
https://cammotion.com/camshafts/pd-2...-displacement/
https://cammotion.com/camshafts/pd-2...-displacement/

 

What do you think will make them a little soft on the low end? The wide LSA?

 

I realized after I posted that my recent track day taught me that track tires that are up to temp put down power a heck of a lot better than even autox tires do on the street (where you can't stay on it long enough to get them really hot).

My car won't hook 2nd *at all* on the street, but at the track day, once the tires were hot, it'd hook 2nd no problem. So for my car at least (2400#, 471 rwhp with lots of midrange torque, skinny 205 section tires), I really only "need" traction control on the street.