Where da PD-blower truck cams at?
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 79
Likes: 21
Where da PD-blower truck cams at? LSA blower, 10:1 LH6, stock converter, stock iron manifolds & cats, stock 4L60E (so, no use for 6000+ RPM cams), 5200lbs.
How awful is the LS9 cam, really, if you were looking for stock-like driveability/manners and trying to not break things (lookin' at you, Mr. 60E...)? Or, how awful would it be with a stock replacement non-DOD truck cam?
How awful is the LS9 cam, really, if you were looking for stock-like driveability/manners and trying to not break things (lookin' at you, Mr. 60E...)? Or, how awful would it be with a stock replacement non-DOD truck cam?
TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
To hear Richard Holdener tell it, any cam is a blower cam, BUT it helps to have minimal overlap to minimize blowing the mix out the exhaust during that time. I think just a nice conservative cam will keep it flexible, and let the blower do the heavy lifting.
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 79
Likes: 21
Sorry, that was sarcasm. If this were N/A I'd pick my own lobes and get a custom. But the blower stuff I'm kinda lost. And this isn't exactly a straightforward list of requirements, either. Picking/designing a cam to specifically NOT make the most power possible isn't something I have experience with.
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Pretty much any cam you put in a ls runs to 6000+ rpm.....even the stock ones.
Holdener did a test of a 202 cam. That's pretty much the only one I've seen him rest that would be worth changing to in a actual truck that gets used for truck stuff.
Holdener did a test of a 202 cam. That's pretty much the only one I've seen him rest that would be worth changing to in a actual truck that gets used for truck stuff.
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Verdad Gallardo TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
That is actually the one I had in mind when mentioning Tooley's cams. The Truck Torque cam. 202/202, .511/.511, 111+1. Picked up 20# torque or better throughout the RPM band. I've seen nothing like it. For a truck, choose the cam that has the N/A characteristics you want. Boost just adds to the numbers.
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 79
Likes: 21
111* L/S with a blower?
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The stock cam is allegedly 193/193, 114 L/S, .482/.482. It will rev to 6K but there's no point trying that, it makes no power past 55-5600, and shifting it that early puts it down below the meaty part of the torque curve at the bottom of 2nd. Making it happy out to 6K will make it happier at the bottom of 2nd gear. I realize the blower will change the way everything behaves but that's the part where I'm just guessing. I don't know which parts will change by how much.
Will the LS9 cam not do what I want? It's cheap, has good enough driveability for GM to put it in stock emissions-compliant vehicles (though I don't have to worry about meeting any kind of inspections), it'll make enough power to meet my goals, and AFAIK it's designed to soften the low-end enough to not break stuff. I'm not opposed to spending more for an aftermarket or custom cam, it's just a cost/benefit ratio thing. Hell, if it'll make 500HP/500TQ with the stock puny-assed DOD cam I don't even need to change it. More isn't always better.
-----
The stock cam is allegedly 193/193, 114 L/S, .482/.482. It will rev to 6K but there's no point trying that, it makes no power past 55-5600, and shifting it that early puts it down below the meaty part of the torque curve at the bottom of 2nd. Making it happy out to 6K will make it happier at the bottom of 2nd gear. I realize the blower will change the way everything behaves but that's the part where I'm just guessing. I don't know which parts will change by how much.
Will the LS9 cam not do what I want? It's cheap, has good enough driveability for GM to put it in stock emissions-compliant vehicles (though I don't have to worry about meeting any kind of inspections), it'll make enough power to meet my goals, and AFAIK it's designed to soften the low-end enough to not break stuff. I'm not opposed to spending more for an aftermarket or custom cam, it's just a cost/benefit ratio thing. Hell, if it'll make 500HP/500TQ with the stock puny-assed DOD cam I don't even need to change it. More isn't always better.
TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
If you really want to use the LS9 cam, no one will stop you. It's just not a great cam.
The 111degree LS on the truck cam is OK because of the low duration. Overlap at .050 is -20. On the LS9 it's -24.5, only 4.5 degrees difference. And way less low end torque than with the Truck Torque cam.
Your call....
The 111degree LS on the truck cam is OK because of the low duration. Overlap at .050 is -20. On the LS9 it's -24.5, only 4.5 degrees difference. And way less low end torque than with the Truck Torque cam.
Your call....
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 79
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I'm looking to duplicate what GM would have done if they'd put a blower on a 5.3L Envoy/Trailblazer at the factory. I do not want a weekend toy that spends half its life torn apart. I realize that is not exactly sexy in internet-forum world where everything has to be triple pumps and a billet-everything Level 9.9 trans...
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 79
Likes: 21
I know how to spec a cam to maximize low end torque, thanks.
I DO NOT want or need to maximize low-end torque here, that's what the blower is for and in my admittedly limited knowledge it's very good at that, sometimes too good. So, cam it as if it were going to rev to 7500 which softens it down low (somewhat?), and just set it to shift at 6K?
I DO NOT want or need to maximize low-end torque here, that's what the blower is for and in my admittedly limited knowledge it's very good at that, sometimes too good. So, cam it as if it were going to rev to 7500 which softens it down low (somewhat?), and just set it to shift at 6K?
TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 79
Likes: 21
TECH Senior Member
Joined: Jun 2016
Posts: 22,306
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From: Central Cal.
Go back and read Hiosilver's post. He gave good advice, though you don't seem open to it. I gave you some good info, but you would rather listen to your own BS. Hio and I are apparently the ONLY ones who felt you worthy to reply to as we like helping people. Sometimes that can backfire.
Just know this- However an engine is NA, a blower makes more of. Watch Holdener's videos. He is always saying "every cam is a boost cam". For good reason.
Just know this- However an engine is NA, a blower makes more of. Watch Holdener's videos. He is always saying "every cam is a boost cam". For good reason.
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 79
Likes: 21
https://ls1tech.com/forums/generatio...lp-needed.html
Pretty similar application in that thread, with helpful discussion and suggestions, and I cannot help but notice that is a thread you did not participate in. I would greatly appreciate a discussion like the one above, not 'watch some HOLDENER vids he knows everything' or 'call a cam company'. **** right the **** off.
Pretty similar application in that thread, with helpful discussion and suggestions, and I cannot help but notice that is a thread you did not participate in. I would greatly appreciate a discussion like the one above, not 'watch some HOLDENER vids he knows everything' or 'call a cam company'. **** right the **** off.
TECH Senior Member
Joined: Jun 2016
Posts: 22,306
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From: Central Cal.
https://ls1tech.com/forums/generatio...lp-needed.html
Pretty similar application in that thread, with helpful discussion and suggestions, and I cannot help but notice that is a thread you did not participate in. I would greatly appreciate a discussion like the one above, not 'watch some HOLDENER vids he knows everything' or 'call a cam company'. **** right the **** off.
Pretty similar application in that thread, with helpful discussion and suggestions, and I cannot help but notice that is a thread you did not participate in. I would greatly appreciate a discussion like the one above, not 'watch some HOLDENER vids he knows everything' or 'call a cam company'. **** right the **** off.
And BTW, the thread referenced by you plainly stated the LS9 was a crappy cam. I guess I didn't say it clearly enough....
TECH Enthusiast
Joined: Jul 2018
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From: Missouri
Sounds like he is trying to justify the ls9 cam to himself, I agree call cammotion they have 2 pd blower shelf cams that would work nice .