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Thread: Texas Speed Stage 3 VVT Camshaft C7 GS does not make power before 4600 rpm

  1. #41
    Advanced Tuner
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    Quote Originally Posted by Sachs View Post
    This morning I did a test. I took the OEM LT1 Intake manifold from my 17 SS 1LE and put it on the vette.

    Noticeable torque increase in the problem area. My cylinder airmass at 3800 rpm is at 0.74g, instead of 0.68g with the MSD (MAF at 195g/s instead of 170g/s). Definitely a flow issue between heads/IM/TB...

    I'm assuming +8% airmass = +8% torque...
    Maybe the msd needs a bigger throttle body? OEM zr1 95mm TBs aren't that expensive...
    2019 C7 ZO6 M7.

  2. #42
    I know there are some common rules of thumb for RPM shift points and peak power, but is there one for decreasing airmass? I would think the optimization would not just be at the inflection point/peak of airflow, now airmass should theoretically drop after peak torque, but I know you should keep revving it after but I think its dependent on your next gear ratio as well.

  3. #43
    Quote Originally Posted by HeavyChevy305 View Post
    Maybe the msd needs a bigger throttle body? OEM zr1 95mm TBs aren't that expensive...
    Yep, I've had some people telling me that I should put a 95mm TB...

  4. #44
    Typically my airmass increase up to max torque then plateau or decreases slightly...

  5. #45
    I really hope we can end up using the C8 LT2 intake manifold, from what I am seeing it should help a lot. Apparently the LT1 intake manifold is extremely limited just due to how crowded the runners are and its the C7's fault since there is so little clearance, I am hoping there is enough room in the Camaro to put a LT2.

    Also I wonder how it would do if you tried a truck intake?

  6. #46
    Guys,

    Airmass comparison between stock IM/Stock TB vs MSD (slightly ported)/87mm ported TB. 2800FT elevation



    Stock TB/IM is better all the way to 5800 rpm.

    You can see that even stock IM/TB struggles a little from 3400-4000
    Last edited by Sachs; 1 Hour Ago at 11:00 AM.

  7. #47
    More data with the FBO data.

    This matches the dyno almost exactly. All data at 2800-3000Ft elevation



    With my heads and MSD the cam makes more power starting 5200 rpm, which the airmass shows. The biggest torque difference is 4000 rpm, airmass shows the same.

    The stock IM diminish by half the torque loss, but clearly makes less power than the MSD up top, by 4-5%

    Clearly Airmass is a good indicator of the power

    What is weird is from 3000-3400 the TSP makes more or less the same torque than OEM then falls off from 3400-4200 rpm. I clearly want to try the ported heads.

    Last edited by Sachs; 1 Hour Ago at 11:53 AM.

  8. #48
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    Dec 2015
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    Do you have a graph of your afr through the pull?
    2019 C7 ZO6 M7.

  9. #49
    I can do one, but 0.86-0.88 Lambda through all the pulls