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Old Dec 31, 2012 | 02:49 PM
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Default Cam spec
Hi,

I would like to know if this cam is compatible with Twin Turbo application or supercharge?!

LIVERNOIS MOTORSPORTS L92 STAGE 2R MAX CAMSHAFT.

Cam spec:

Intake Duration: 235@.050
Exhaust Duration: 242@.050
Intake lift:.603"
Exhaust lift:.608"
LSA:114

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Old Dec 31, 2012 | 10:04 PM
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Why so big? What size engine? It might work well with a blower but def not the best for a turbo from what I can tell. A turbo cam and blower cam are going to be different. You should call comp cams and ask them
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Old Dec 31, 2012 | 11:58 PM
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Originally Posted by longrodlx
Why so big? What size engine? It might work well with a blower but def not the best for a turbo from what I can tell. A turbo cam and blower cam are going to be different. You should call comp cams and ask them
It is a 427 CI, 9.5 compression - TT.
Last edited by lingenfelter200; Jan 1, 2013 at 12:28 AM.
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Old Jan 1, 2013 | 01:32 AM
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I would call up comp or someone else and get a full custom cam if I was you. You don't have an off the shelf type engine or setup so why buy an off the shelf cam
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Old Jan 1, 2013 | 02:58 AM
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If the downpipes are unrestricted, completely, run a cam for a N/A setup. If they are a restriction, cam wont matter much.
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Old Jan 1, 2013 | 04:55 AM
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Originally Posted by p1bz
If the downpipes are unrestricted, completely, run a cam for a N/A setup. If they are a restriction, cam wont matter much.
My application is Twin Turbo C5 with:

427 CID engine.
LQ9 block
LS3 heads ported.
LS3 intake manifold.

LIVERNOIS MOTORSPORTS L92 STAGE 2R MAX CAMSHAFT

Intake Duration: 235@.050
Exhaust Duration: 242@.050
Intake lift:.603"
Exhaust lift:.608"
LSA:114

Twin Turbo Garrett 76mm T3

Only 5 psi of boost for testing and the tuner notified me to replace this cam, because it's not compatible with the twin turbo setup.

There is some drop in power

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Last edited by lingenfelter200; Jan 1, 2013 at 05:01 AM.
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Old Jan 1, 2013 | 11:51 AM
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76mm compressor side I assume? What is the exhaust side? Wheel, a/r....

Looks like boost starts coming in at 3k. But 5psi through 2 76mm compressors and barely 450hp sounds like you could be on the surge line. Did the tuner not try turning up boost to get the turbo's closer to their efficiency zone?

Agree with the above statement that if you don't have backpressure issues, then you can run an NA cam with turbo application. If you could actually hold 5psi, then it sounds like backpressure is not an issue.
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Old Jan 1, 2013 | 11:54 AM
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Btw, sounds like a wicked setup! Any pictures??
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Old Jan 1, 2013 | 12:24 PM
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From the looks of that run, its not the cam. Drop the exhaust off of it. Its not the cam. There is a restriction on the exhaust side.
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Old Jan 1, 2013 | 12:30 PM
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Garrett Turbo T3T4:
compressor wheel 70
inducer 76
.63 A/R


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Old Jan 1, 2013 | 04:27 PM
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Originally Posted by lingenfelter200
Garrett Turbo T3T4:
compressor wheel 70
inducer 76
.63 A/R
Holy shyt! No wonder it's dropping off. Cam may not be ideal but 427" is trying to exhale through two twisty straws.
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Old Jan 1, 2013 | 05:13 PM
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Originally Posted by bradenW
Holy shyt! No wonder it's dropping off. Cam may not be ideal but 427" is trying to exhale through two twisty straws.
To the OP here look at what he is telling you here, He is running Twin/76 turbo,s also. Should know his stuff on them.. Robert
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Old Jan 1, 2013 | 05:39 PM
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Originally Posted by robert miller
To the OP here look at what he is telling you here, He is running Twin/76 turbo,s also. Should know his stuff on them.. Robert
I'm not actually.
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Old Jan 1, 2013 | 06:39 PM
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Originally Posted by bradenW
Holy shyt! No wonder it's dropping off. Cam may not be ideal but 427" is trying to exhale through two twisty straws.
Whoa! .63 a/r T3 housings and 427ci don't mix. Disconnecting exhaust won't help here, need larger housings. Agree with Braden. What size is the turbine wheel?
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Old Jan 1, 2013 | 10:02 PM
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My friend is running the same project, but different camshaft.

9.5@13 psi

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Old Jan 1, 2013 | 11:29 PM
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The housings are far from ideal, but they are not the whole problem. Drop the exhaust off, and re-dyno. Also pull the air filters. You have a restriction.
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Old Jan 2, 2013 | 10:45 AM
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Originally Posted by p1bz
The housings are far from ideal, but they are not the whole problem. Drop the exhaust off, and re-dyno. Also pull the air filters. You have a restriction.
I did what you said, pulled the air filters and boosted the engine with 11 psi.



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Old Jan 2, 2013 | 11:23 AM
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Did you pull the filters and exhaust, or just filters? On a Turbo setup, exhaust back pressure is everything. Also, with 11psi it should be making more power than that? Its hard to diagnose on the web, I will PM my number.
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Old Jan 4, 2013 | 04:18 AM
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Originally Posted by p1bz
Did you pull the filters and exhaust, or just filters? On a Turbo setup, exhaust back pressure is everything. Also, with 11psi it should be making more power than that? Its hard to diagnose on the web, I will PM my number.

Yes I did, I pulled the filters and the exhaust. It gained 8 rwhp only!!! Do you think the valve springs will cause this issue?
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Old Jan 4, 2013 | 08:38 AM
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The turbine housings are way too small and compounding the problem is the cam that is even worse with the tiny turbines.
Last edited by bradenW; Jan 4, 2013 at 08:40 AM.
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