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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 06-04-2011, 11:29 PM   #1
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Default Matching cam with stall?

Can someone explain to me how to match the cam with my stall?
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Old 06-05-2011, 12:46 AM   #2
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From what I've been told, you want your converter stall to be around 500rpm under the cams peak torque number. So if your cam makes peak torque at 4000 rpm, then you would want a 3400 to 3600 stall converter.
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Old 06-05-2011, 07:32 AM   #3
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Yup, what oakley said. You don't want to put a cam with a high-rev curve on a low-stall converter, which would keep the engine below its optimum power range while you're accelerating.
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Old 06-05-2011, 11:11 AM   #4
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for best performance at the track the converter needs to stall within 1000 rpm of the shift point.

Smaller the dia conveter is better for effiency

Tim
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Old 06-05-2011, 11:20 AM   #5
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Quote:
Originally Posted by oakley6575 View Post
From what I've been told, you want your converter stall to be around 500rpm under the cams peak torque number. So if your cam makes peak torque at 4000 rpm, then you would want a 3400 to 3600 stall converter.
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for best performance at the track the converter needs to stall within 1000 rpm of the shift point.

Smaller the dia conveter is better for effiency

Tim
A stone stock LS6 has a torque peak at 4,800 rpm and a factory shift point of 6,500 rpm - so that calls for a stall somewhere between 4,300 and 5,500 rpm - Is that right? Sure sounds high.

(I don't claim to know).
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Old 06-05-2011, 11:53 AM   #6
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I've never heard to run a converter thats 1000rpm lower than the shift point. Thats just not streetable. It would burn up the trans extremely fast. That may be right for a true drag car. But nothing that runs on the street.

The point of an aftermarket converter is to stall somehwere in your torque range. 4300 seems high and impractical for a stock ls6. As long as your stall isn't where your motor makes low torque numbers, it will be okay for you. 3600 to 3800 would put that motor into a good torque band and get you up faster to your peak of 4800.
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Old 06-05-2011, 12:15 PM   #7
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Back when I had an auto, I just filled out a form w/ Precision Industries and they made me a Vigilante torque converter that was set up ideally for my vehicle weight and engine.
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Old 06-05-2011, 12:17 PM   #8
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Quote:
Originally Posted by Darkman View Post
A stone stock LS6 has a torque peak at 4,800 rpm and a factory shift point of 6,500 rpm - so that calls for a stall somewhere between 4,300 and 5,500 rpm - Is that right? Sure sounds high.

(I don't claim to know).
No and no.

You typically pick a converter thats 1000 under peak torque. That doesn't mean that the car won't perform well with other stall speeds. With our cars its pretty simple. If you want conservative (cam or not) stick with a 2800-3200. If you want decent performance with some loss of gas mileage (cam or not) go 3600. 4k-4400 I would reserve for cars getting away from the stock cam. Rear gearing will help or hurt you for drivability. 2.73s and 3.23s are going to make a converter drive like its slightly biger, 3.73s and 4.10s will help it seem like a smaller converter (good for gas mileage).
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Old 06-05-2011, 12:39 PM   #9
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No and no.

You typically pick a converter thats 1000 under peak torque. That doesn't mean that the car won't perform well with other stall speeds. With our cars its pretty simple. If you want conservative (cam or not) stick with a 2800-3200. If you want decent performance with some loss of gas mileage (cam or not) go 3600. 4k-4400 I would reserve for cars getting away from the stock cam. Rear gearing will help or hurt you for drivability. 2.73s and 3.23s are going to make a converter drive like its slightly biger, 3.73s and 4.10s will help it seem like a smaller converter (good for gas mileage).
That sounds better. One follow-up question:

I notice that the stock LS6 cam as well as aftermarket cams that we consider "conservative" tend to have higher number LSAs. These higher LSAs tend to retain, and sometimes even increase, the relatively high torque peak (4,800 rpm) associated with the stock LS6 for example.

On the other hand, less conservative aftermarket cams tend (at least seemingly) to have lower numbered LSAs, which tend to lower the torque peak rpm level somewhat.

Does that mean then, that conservative cams often require a higher stalls than so-called "radical" cams?
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Old 06-05-2011, 02:50 PM   #10
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Quote:
Originally Posted by 01ssreda4 View Post
No and no.

You typically pick a converter thats 1000 under peak torque. That doesn't mean that the car won't perform well with other stall speeds. With our cars its pretty simple. If you want conservative (cam or not) stick with a 2800-3200. If you want decent performance with some loss of gas mileage (cam or not) go 3600. 4k-4400 I would reserve for cars getting away from the stock cam. Rear gearing will help or hurt you for drivability. 2.73s and 3.23s are going to make a converter drive like its slightly biger, 3.73s and 4.10s will help it seem like a smaller converter (good for gas mileage).
+1, i have a few friends that daily drive ms3, 4000 stall, 4.10 a4 cars. drinks a little more gas, but are fun to drive. even on long trips they do fine on the highway under 70.
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Old 06-05-2011, 03:04 PM   #11
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So here is why I asked this question. I have a 6.0 with cnc 243s, 3400 yank and a cam that I got talked into. It is suppose to be for 10 lb of boost but my buddy said it will love the nitrous. I am wanting to get rid of the nitrous and run na. So I'm trying to pick a good cam on my own but I am clueless about cams. O and I have 3.73s

Any advice?
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Old 06-05-2011, 03:06 PM   #12
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4.10s here with an ms3 and a TCI 3000 stall. She eats up gas around town but doesn't do too bad on the highway. And is a blast to drive.
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Old 06-05-2011, 03:42 PM   #13
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Originally Posted by combs_425 View Post
So here is why I asked this question. I have a 6.0 with cnc 243s, 3400 yank and a cam that I got talked into. It is suppose to be for 10 lb of boost but my buddy said it will love the nitrous. I am wanting to get rid of the nitrous and run na. So I'm trying to pick a good cam on my own but I am clueless about cams. O and I have 3.73s

Any advice?
What rpms for shifts and redline?
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Old 06-05-2011, 04:05 PM   #14
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I am shifting at 6500
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Old 06-05-2011, 04:58 PM   #15
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Quote:
Originally Posted by combs_425 View Post
So here is why I asked this question. I have a 6.0 with cnc 243s, 3400 yank and a cam that I got talked into. It is suppose to be for 10 lb of boost but my buddy said it will love the nitrous. I am wanting to get rid of the nitrous and run na. So I'm trying to pick a good cam on my own but I am clueless about cams. O and I have 3.73s

Any advice?
With those mods of recommend around a 224-228 on a 110 lsa for alittle stronger bottom end and a nice lope....should work good with that stall
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Old 06-05-2011, 07:31 PM   #16
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Quote:
Originally Posted by combs_425 View Post
So here is why I asked this question. I have a 6.0 with cnc 243s, 3400 yank and a cam that I got talked into. It is suppose to be for 10 lb of boost but my buddy said it will love the nitrous. I am wanting to get rid of the nitrous and run na. So I'm trying to pick a good cam on my own but I am clueless about cams. O and I have 3.73s

Any advice?
There are so many vendors on this site for you to call. Each one can sell ya
a custom stick to suit your needs. Make sure 2 know if your 6.0 has dished
lq4 or flat lq9 pistons as the ensuing compression ratio difference will affect
the desired camshaft profile. Because you have a decent stall and gears plus
the 18 extra inches of the 6 liter I'd suggest the EPS 236 deg. @ .050 with
.615 lift.....
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Old 06-06-2011, 02:19 AM   #17
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well i thought i had a lq4. i got this motor off a o1 gmc. this guy wrecked the truck and he sold just the motor and the chassis. when i put the motor together the pistions were flat. does that mean i have a lq9? the cam i have in it now is a 230/242 .361/.361 with a 109.5 lsa. i onlyput down 383. i was expecting a lot more. could the overlap in the cam cause this?


thanks
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Old 06-06-2011, 10:46 PM   #18
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The cam you have with 12 deg. more ex. duration is more suited for a stock
unported cyl. head which only flows about 65-70% ex. to in. ratio. Since
you said yours were cnc 243s I figured depending on whose program it was
they are probably more like 75-80% ratio which would work better with a
single pattern cam. Call Geoff @ EPS or any of the vendors for suggestions
Texas Speed ,Thunder Racing ,and Futral can help ya out.
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Old 06-08-2011, 10:03 AM   #19
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Thanks for all the help.
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Old 06-08-2011, 10:03 AM
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3000, 3400, 3600, cam, camshaft, converter, conveter, happen, ls6, match, matching, ms3, put, speed, stall, upgrade


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