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  1. #1
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    restrictor plate update

    Today I ran the 45mm restrictor plates on my ACRx. RWHP was way lower than I had hoped

    1st run 527 hp-502 tq
    2nd run 531 hp-505 tq
    3rd run 531 hp- 510 tq


    I had hope to be in the 575 to 600 range.

    So I order two additional sets, 50 mm and 53 mm to give them a try. I will remachine the 45mm to fine tune if needed.

    So since the dyno run was a bust for now we pulled the restrictors off and did 3 more pulls

    Best pull was the last 697 hp - 578 tq though I think the car was slipping on the dyno as my tq curve drops at 5000 and starts going back up at 5800 and repeaks at 6400


    It's back to the dyno in a week.
    Last edited by catwood; 01-15-2020 at 08:55 PM. Reason: up the size
    2017 ACR-E (a real one)
    2010 ACRx #24

  2. #2
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    Back In Black's Avatar
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    Quote Originally Posted by catwood View Post
    Today I ran the 45mm restrictor plates on my ACRx. RWHP was way lower than I had hoped

    1st run 527 hp-502 tq
    2nd run 531 hp-505 tq
    3rd run 531 hp- 510 tq


    I had hope to be in the 575 to 600 range.

    So I order two additional sets, 47mm and 48 mm to give them a try. I will remachine the 45mm to fine tune if needed.

    So since the dyno run was a bust for now we pulled the restrictors off and did 3 more pulls

    Best pull was the last 697 hp - 578 tq though I think the car was slipping on the dyno as my tq curve drops at 5000 and starts going back up at 5800 and repeaks at 6400


    It's back to the dyno in a week.
    You mean your hp curve peaks at 6400?

    What do you have? 9L or 9L extreme? Where did you get your restrictors?

    Wow...160hp hair cut. I was curious to see what your results would be as I was considering 50mm restrictors with a heads/cam engine vs. unrestricted OEM engine to run in SCCA races. Will have to rethink that now.
    Last edited by Back In Black; 01-15-2020 at 05:39 PM.
    2008 Viper ACR
    2009 Viper SRT-10X | 190mph Standing Mile | 10.76@133.7mph 1/4 Mile

  3. #3
    VOA Mamba Member
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    yes, peaks at 6400 without the restrictors. With about 5600 it goes flat to 6400

    I have two sets of bigger restrictors coming 50 and 53mm. I'll post up those results.

    Plates are from Arrow/Prefix. Engine is a Gen IV heads and came package.
    2017 ACR-E (a real one)
    2010 ACRx #24

  4. #4
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    Quote Originally Posted by catwood View Post
    yes, peaks at 6400 without the restrictors. With about 5600 it goes flat to 6400

    I have two sets of bigger restrictors coming 50 and 53mm. I'll post up those results.

    Plates are from Arrow/Prefix. Engine is a Gen IV heads and came package.
    Stout numbers for a heads/cam engine!
    2008 Viper ACR
    2009 Viper SRT-10X | 190mph Standing Mile | 10.76@133.7mph 1/4 Mile

  5. #5
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    Arizona Vipers's Avatar
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    Quote Originally Posted by catwood View Post
    Today I ran the 45mm restrictor plates on my ACRx. RWHP was way lower than I had hoped

    1st run 527 hp-502 tq
    2nd run 531 hp-505 tq
    3rd run 531 hp- 510 tq


    I had hope to be in the 575 to 600 range.

    So I order two additional sets, 50 mm and 53 mm to give them a try. I will remachine the 45mm to fine tune if needed.

    So since the dyno run was a bust for now we pulled the restrictors off and did 3 more pulls

    Best pull was the last 697 hp - 578 tq though I think the car was slipping on the dyno as my tq curve drops at 5000 and starts going back up at 5800 and repeaks at 6400


    It's back to the dyno in a week.
    Did you do the formula yet? I think you'll be 510 nasa average.
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  6. #6
    VOA Mamba Member
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    Quote Originally Posted by Arizona Vipers View Post
    Did you do the formula yet? I think you'll be 510 nasa average.
    I'm going back to the dyno monday with two new sets of plates. I thought we were going to do 50 and 53mm but I have 50 and 55mm. I put the 55s in and will pull that. Shooting for 590 average. If it's 560-570 I can pull some weight. if it's 604 or higher I'll probably have to add a little.
    2017 ACR-E (a real one)
    2010 ACRx #24

  7. #7
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    Wow Carl, you are making a ton of power!! My G3 is right at 600/585. Peak HP @ 6k, torque at 4800


    Good luck with the restriction plates. Feel free to keep them on the car when we go to AZ!!!
    1994 Red/Tan RT/10, '99 red ACR- sold, '06 Red/Silver Coupe-RIP, '06 Red/Silver Coupe - Sold, '08 Red/Silver ACR-C sold, 2006 Comp Coupe C-92

  8. #8
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    Quote Originally Posted by RedTanRT/10 View Post
    Wow Carl, you are making a ton of power!! My G3 is right at 600/585. Peak HP @ 6k, torque at 4800


    Good luck with the restriction plates. Feel free to keep them on the car when we go to AZ!!!
    I'll bring them for fun. I'll put the 45mm on your CC. It's a 70% reduction in air flow
    2017 ACR-E (a real one)
    2010 ACRx #24


 

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