Theoretically, Stealth cam tune

[pancake]

Is it possible to get a mild cam that has lope at idle and to make it stealth sounding?

Cam I'm looking at is a BTR Stage 2 cam for an LS1. https://www.briantooleyracing.com/ls...ge-ii-cam.html

Specs: Specs: 227/234 .614"/.576" 113+2

Sound video:


I know nothing about tuning but I'm guessing since everyone says "it's all in the tune", and also the fact that ghost cam idle tunes exist... it should be possible to tune the idle to sound stock or close to it right?

[mbray01]

yes and no, you can "tame" the sound of the cam, that cam is naturally going to want to lope, so it will be tricky, also a quiet exhaust will help mask the sound as well

[pancake]

yes and no, you can "tame" the sound of the cam, that cam is naturally going to want to lope, so it will be tricky, also a quiet exhaust will help mask the sound as well

If I ran no headers, a quiet exhaust and a tune that address the lope, is it possible that the tune will have enough flexibility to go from what you hear in that video to something that sounds more stock or would only be recognized by a trained ear?

I'm kind of winging it as there are 0 videos without headers but I like the cam and am hoping the tune + exhaust can play a large part in masking the sound of the cam.

[mbray01]

theres only so much tuning will do, adding idle timing will help to control cam lope by controlling the amount of air available in the cylinders, letting it idle a little higher than normal will help, then limiting idle timing corrections (over/under) will limit the amount of ecm induced lope. Its hard to say will it calm it enough to hide it, i would venture to say no. thats still a pretty aggressive street cam

[pancake]

theres only so much tuning will do, adding idle timing will help to control cam lope by controlling the amount of air available in the cylinders, letting it idle a little higher than normal will help, then limiting idle timing corrections (over/under) will limit the amount of ecm induced lope. Its hard to say will it calm it enough to hide it, i would venture to say no. thats still a pretty aggressive street cam

Thanks for the explanation. Maybe not fully stock but I would be happy if the tune and exhaust together produced a "somewhat stealth" or barely noticeable lope.

I guess I won't know for sure until I try it.

[kingtal0n]

If the cam is small enough it may be programmed to only lope when you want it to.
For example I used 216/220* .550 and it only lopes when the air fuel ratio is leaner than 14.7's
Add that to a 'stock style' muffler (like a typical off the shelf truck muffler) and you can't tell it's got the cam or even a V8.

But this topic confuses me a little bit. Since with a turbocharger one might use a stock cam (no lope, ever) and still produce 500 or 600rwhp easily.
So it's not like somebody hearing the cam is going to have any reference on the power it makes.

[mbray01]

216/220 is a far cry from 227/234

[kingtal0n]

216/220 is a far cry from 227/234

aint that the truth

IMO 234+ those duration numbers are novelties and not useful in silent effect.
In a true stealth application duration numbers approaching 220 are already worth 1000rwhp+ so you would rarely have any reason when using a SBE to exceed that.
unless you wanted the car to shake and idle higher out of necessity, just for the effect

A 4-cylinder is more elegantly done in this strategy, and a 6 is ideal. For the 8-habitat, I would prefer absolute as close to rock bottom for fuel savings of turning keeping all this rotating 80e mass. In such high output applications a little weight is not unwanted as it seems to help stabilize the oem chassis when using rwd nitrous on 'street tires', implied by the stealth app. of course

In other words, 600-1000whp street machine silence is easily achieved SBE at 212* to 228* duration