Who heard my Stealth II idle at the Thunder Shootout?
11-10-2003, 12:08 PM
#1
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Who heard my Stealth II idle at the Thunder Shootout? Tell the others what you heard for those who may doubt what I've been saying about this engine's idle. 
Remember, with the AC on I had the idle programmed at 675. With it off it was 550.
I keep reading about Stealth II setups that don't idle like stock and I really don't understand it. I have to idle mine down to 550 with the cuttout open to get enough lope to notice. Cuttout open with the idle at 675?...ZERO lope.
BTW, my idle tuning is completely stock. Stock timing, stock VE, stock IAIG, stock, stock, stock, etc...
Thanks!
Remember, with the AC on I had the idle programmed at 675. With it off it was 550.
I keep reading about Stealth II setups that don't idle like stock and I really don't understand it. I have to idle mine down to 550 with the cuttout open to get enough lope to notice. Cuttout open with the idle at 675?...ZERO lope.
BTW, my idle tuning is completely stock. Stock timing, stock VE, stock IAIG, stock, stock, stock, etc...
Thanks!
11-10-2003, 12:17 PM
#2
We don't doubt you Colonel. It's just that there are those that DO lope which negates the "stealth" title of the cam. Jayson even acknowledged that it does lope depending on the car.
If you can run the cam and not have lope, sweet. If not, you get a slight lope but a lope none-the-less.
If you can run the cam and not have lope, sweet. If not, you get a slight lope but a lope none-the-less.
11-10-2003, 12:55 PM
#4
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I heard it. 
My friend Travis heard it. He kept talking about it. It was AMAZING. Cutout closed, A/C on, that thing sounded like a stock car with a catback. That was it. No lope. Even A/C off, lope was almost unperceptable. It would have been a maybe/maybe not.
Open the cutout, you could hear a little lope. Didn't seem like 420 RWHP worth of lope tho. Truly a sleeper combo.
I started up my car for my wife this morning.
It's the complete opposite. Oh, to have a picture of her face when she heard it. "Oh my God! Is it always going to sound like that?". It lopes and cadences *hard*.
-Andrew
My friend Travis heard it. He kept talking about it. It was AMAZING. Cutout closed, A/C on, that thing sounded like a stock car with a catback. That was it. No lope. Even A/C off, lope was almost unperceptable. It would have been a maybe/maybe not.
Open the cutout, you could hear a little lope. Didn't seem like 420 RWHP worth of lope tho. Truly a sleeper combo.
I started up my car for my wife this morning.
It's the complete opposite. Oh, to have a picture of her face when she heard it. "Oh my God! Is it always going to sound like that?". It lopes and cadences *hard*.-Andrew
11-10-2003, 01:00 PM
#5
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"It's just that there are those that DO lope which negates the "stealth" title of the cam."
That's just it...I don't understand WHY other's have lope at 850 RPM and I have absolutely ZERO even at 675 with the cuttout open. I WANT to understand why there is a difference so that I can help other's to achieve the results that I have. There is a logical reason(s) why this cam idles like stock in one engine and not in another. I think we should endevor to find out what this reason(s) is.
I disagree that the title of the cam is wrong. I think there are other issues causing the lope (obviously this is the case since I have no lope and I'm using the very same cam.) You can make the stock cam have lope if the tuning is bad enough.
That's just it...I don't understand WHY other's have lope at 850 RPM and I have absolutely ZERO even at 675 with the cuttout open. I WANT to understand why there is a difference so that I can help other's to achieve the results that I have. There is a logical reason(s) why this cam idles like stock in one engine and not in another. I think we should endevor to find out what this reason(s) is.
I disagree that the title of the cam is wrong. I think there are other issues causing the lope (obviously this is the case since I have no lope and I'm using the very same cam.) You can make the stock cam have lope if the tuning is bad enough.
11-10-2003, 01:01 PM
#6
I think we all need to have a universal definition of stealth regarding this cam.
Is it:
Stealth: indistinguishable from a stock LS1 camshaft
or...
Stealth: slightly more lope than a stock LS1 camshaft and very mild when compared to 224/112s, etc.
Most people assume that stealth equates to the former not the latter.
Is it:
Stealth: indistinguishable from a stock LS1 camshaft
or...
Stealth: slightly more lope than a stock LS1 camshaft and very mild when compared to 224/112s, etc.
Most people assume that stealth equates to the former not the latter.
11-10-2003, 01:04 PM
#7
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Thread Starter
Thanks Andrew. :thumbs:
"Even A/C off, lope was almost unperceptable. It would have been a maybe/maybe not."
"Open the cutout, you could hear a little lope. Didn't seem like 420 RWHP worth of lope tho. Truly a sleeper combo."
Right, and again I'll remind everyone that this was with the idle at 550 RPM. I lowered this much because I was actually TRYING to make it lope. It's almost impossible to do!
"Even A/C off, lope was almost unperceptable. It would have been a maybe/maybe not."
"Open the cutout, you could hear a little lope. Didn't seem like 420 RWHP worth of lope tho. Truly a sleeper combo."
Right, and again I'll remind everyone that this was with the idle at 550 RPM. I lowered this much because I was actually TRYING to make it lope. It's almost impossible to do!
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11-10-2003, 01:06 PM
#8
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Thread Starter
"Stealth: indistinguishable from a stock LS1 camshaft"
This is the one that applies when the idle is above ~650 with the cuttout open or above ~600 with the cuttout closed. As Andrew said, this car sounds EXACTLY like a stock LS1 with headers and no cats.
This is the one that applies when the idle is above ~650 with the cuttout open or above ~600 with the cuttout closed. As Andrew said, this car sounds EXACTLY like a stock LS1 with headers and no cats.
11-10-2003, 01:08 PM
#9
Maybe the grinder is not putting them out w/in the same tolerances?
My brother's idle tuning is stock, just as yours is, there is lope through the Magnaflow catback and through the cutout. We installed it straight up, etc. We've done about 15 LS1 cam installs now so it ain't the mechanical install in this case.
If they're all being installed dot-to-dot, with stock idle tunes then either you have a different spec, just a hair different, or the grinder is not pumping out congruent cams of SSII.
What other ideas to others have?
My brother's idle tuning is stock, just as yours is, there is lope through the Magnaflow catback and through the cutout. We installed it straight up, etc. We've done about 15 LS1 cam installs now so it ain't the mechanical install in this case.
If they're all being installed dot-to-dot, with stock idle tunes then either you have a different spec, just a hair different, or the grinder is not pumping out congruent cams of SSII.
What other ideas to others have?
11-10-2003, 01:09 PM
#10
Originally Posted by Colonel
"Stealth: indistinguishable from a stock LS1 camshaft"
This is the one that applies when the idle is above ~650 with the cuttout open or above ~600 with the cuttout closed. As Andrew said, this car sounds EXACTLY like a stock LS1 with headers and no cats.
This is the one that applies when the idle is above ~650 with the cuttout open or above ~600 with the cuttout closed. As Andrew said, this car sounds EXACTLY like a stock LS1 with headers and no cats.
11-10-2003, 01:10 PM
#11
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Thread Starter
I know that compression ratio can have something to do with it. The higher the C/R, the smoother the idle. My C/R is 11.1:1.
I wonder if higher flowing heads might have something to do with it. These are MTI Stage II LS6 R heads.
Hmmm....
I wonder if higher flowing heads might have something to do with it. These are MTI Stage II LS6 R heads.
Hmmm....
11-10-2003, 01:11 PM
#12
Originally Posted by Colonel
Right, and again I'll remind everyone that this was with the idle at 550 RPM. I lowered this much because I was actually TRYING to make it lope. It's almost impossible to do!
11-10-2003, 01:13 PM
#13
Originally Posted by Colonel
I know that compression ratio can have something to do with it. The higher the C/R, the smoother the idle. My C/R is 11.1:1.
I wonder if higher flowing heads might have something to do with it. These are Stage II LS6 MTI heads.
Hmmm....
I wonder if higher flowing heads might have something to do with it. These are Stage II LS6 MTI heads.
Hmmm....
MTI didn't seem to know why some lope and some didn't. Weird.
11-10-2003, 01:18 PM
#14
That car has NO lope. Even with the cutout open at low rpm it sounded like a stock LS1. Colonel made sure to show everyone around how it sounded, including Mr. Officer 
Your car does make quite a bit of valvetrain noise though, might want to check that out.
Tony
Your car does make quite a bit of valvetrain noise though, might want to check that out.
Tony
11-10-2003, 01:26 PM
#15
Who else has this cam and doesn't lope, either?
My brother is taking the SSII out for the G5X-2. I guess he figured since it did lope, might as well get one of the biggest "lopers" (is that a word?) out there
. When we pull it out, we'll get pics of the engraved Stealth II status on the cam itself.
Let's see if we can get others with the SSII to post their experiences. So far, we have Colonel in stealth status (no lope) and my brother and one other car where the install was done by MTI that are non-stealth in status.
My brother is taking the SSII out for the G5X-2. I guess he figured since it did lope, might as well get one of the biggest "lopers" (is that a word?) out there
. When we pull it out, we'll get pics of the engraved Stealth II status on the cam itself.Let's see if we can get others with the SSII to post their experiences. So far, we have Colonel in stealth status (no lope) and my brother and one other car where the install was done by MTI that are non-stealth in status.
11-10-2003, 01:27 PM
#16
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Well, i have SS1 which in theory due to a lower lsa (115)should lope a little more but at 650rpm, no distinct lope, and I have LS1 stage II heads 10:1 CR. I slapped the stock muffler on just to see and it was as stock, with Hooker it was just louder but nothing I would call 'lope'
11-10-2003, 02:37 PM
#17
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Thread Starter
Yeah, I do have some valvetrain noise. I notice it more now than when we first did the install. I've put about 4,000 miles on the engine since then. I wonder if I have some rockers going out? Might be time for some aftermarket 1.75s. Seems to run perfect though.
11-10-2003, 02:41 PM
#18
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Thread Starter
"including Mr. Officer"
LOL! He didn't seem to be impressed for some reason. I was at a loss for words as to why this was so...in fact, I was quite cuffed about it!
LOL! He didn't seem to be impressed for some reason. I was at a loss for words as to why this was so...in fact, I was quite cuffed about it!
