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2011 CTS-V Coupe with a blue wrap. Cam, smaller pulley, larger injectors, methanol injection.
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I see you have a 9.55 lower pulley. What is your upper pulley's diameter and how many psi of boost does this make? Thanks.
 

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2013 CTS V
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Discussion Starter · #25 ·
I see you have a 9.55 lower pulley. What is your upper pulley's diameter and how many psi of boost does this make? Thanks.
It's a metco 2.4. I don't remember exactly the psi, but I think it was around 16 ish.

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My v made 608 before installing the btr stage 3 cam, got a 9.55 pulley, and few other things. We installed that along with new springs, trunions, also swapped out my injectors that were "1300" for new 1300 fuel development injectors. Cal said that my previous injectors were only rating 1000 on the 608 pass, so I decided to change them up. This is one of the last pulls Cal did on the V, and it pulled 704! I am stoked considering she is still my daily.


Dyno Pull

Youtube Video of top end stuff plus first start with cam

(Tuner : Cal Hartline)

View attachment 153399
Is this their btr stage 3 torque cam ?
 

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2011 CTS-V Coupe with a blue wrap. Cam, smaller pulley, larger injectors, methanol injection.
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16 psi on stock bottom end? Yikes
Is this the max most people run on stock bottom end or is it closer to 14? I'm asking because I'm picking mine up from the shop pretty soon and it has a new lower and upper pulley. It was already running about 12psi, so mine may be pushing more than is safe for the stock bottom end. Mine is on 93 octane with methanol. The guy tuning it does a lot of corvettes, camaros and cadillacs so I'm hoping he knows where the threshold starts and doesn't cross it.
 

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I would say 12 to 14 is max. Timing and such play an additional role but I'd not boost that high on SBE.
 

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Nice! I picked up 144 whp going from a 2.45 upper pulley to a BTR S3 Cam and ported heads on pump 93. Whole different animal, love the cam!
 

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Hey JD just curious were you a cobra owner at one time?
Sure was...Bought a 03 Sonic Blue back in the day! Also owned a 97 & 99 Cobra.
 

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Some thoughts regarding the BTR Stage 3 Cam.
The valve events are:
Rectangle Font Parallel Screenshot Number


This is an old cam, one of the first PD / DD
camshafts for the LSA / LS9 Platform.

If you have stock heads it works pretty well, as the net
usable lift for this camshaft, will be close to the convergence
lift of 0.541"

After that valve lift (net at the valve) the heads move into
both turbulence as well as velocity choke at the higher
engine rpm.

If your cylinder heads have been ported, really ported,
not just been 'Rolled' with a sand paper roll to make
them look pretty, but where a real porter goes in and
removes material in sensitive areas, these heads can
use a higher lift camshaft and make much more power.

------------------------------------------------------------------

For those further interested, I have posted below the
calculated rpm operating ranges for this camshaft.

Required Intake Flow CFM @28 in. = 324.2 to 343.3 at .600 inch Valve Lift
Required Exhaust Flow CFM @28 in. = 229.6 to 248.7 at .575 inch Valve Lift

Stock cylinder heads 'Do Not' flow 324 to 343 cfm!
But some well ported heads will flow 380 cfm at 0.550" of valve lift.


For clarity purposes; the required cylinder head flow is based
on the fact that the flow is measured with the intake manifold.

And once again; the valve lift is not the gross or advertised
lift, it is the 'Net Lift' at the valve after valve train flex and / or
geometric losses.

-- Operating RPM Ranges of various Components --
Best estimate RPM operating range from all Components = 4850 to 6850
Intake Flow CFM @28inches RPM Range from Flow CFM only = 4870 to 6870
***This intake flow cfm relates to the info above which is in bold font.

Intake and Exhaust Systems operating RPM Range = 4998 to 6998

Intake and Exhaust Time-Area operating RPM Range = 3788 to 5788
Camshaft's Intake and Exhaust Lobes operating RPM range = 4832 to 6832

Intake Valve Curtain Time-Area at 0.617 Lift RPM Range = 4585 to 6585
Exhaust Valve Curtain Time-Area at 0.595 Lift RPM Range = 4626 to 6626

Intake Valve Close RPM = 6631 Exhaust Valve Open RPM = 7437
Intake System RPM = 6869 Exhaust System RPM = 7126
Intake Time-Area RPM = 5770 Exhaust Time-Area RPM = 5806

Curtain Area -to- Valve Area Convergence Intake Valve Lift inch= .541
Curtain Area -to- Valve Area Convergence Exhaust Valve Lift inch= .400

After looking over the calculations above, take your Dyno Sheet
and compare the operating ranges I posted and compare them
to your 'Peak Torque RPM', as well as your 'Peak HP RPM'.

I believe you will find some very good information
exposed regarding your engines ability to inhale air.

Once the VE% tapers off, the first thing that
happens is so does your Torque Value as
is related to engine RPM.

Now, even though your engine inhales more air at the
higher engine rpm, the engine demand increases at a
higher rate then does the induction systems ability
(Supply Side) to keep up with the cfm demand.

Cheers
 
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