Bringing boost lower down the rpm range - CorvetteForum - Chevrolet Corvette Forum Discussion



C7 Forced Induction/Nitrous
C7 Corvette Turbochargers, Superchargers, Pulley Upgrades, Intercoolers, Wet and Dry Nitrous Injection, Meth
Sponsored by:
Sponsored by:

Bringing boost lower down the rpm range

Reply
 
 
 
Thread Tools Search this Thread
Old 07-17-2017, 08:41 AM   #1
Kazman1960
CF Senior Member
Thread Starter
 
Member Since: Aug 2014
Location: Timmins Ontario
Posts: 172
Thanked 12 Times in 10 Posts
Default Bringing boost lower down the rpm range

Good day all . Not sure if this subject has been discussed before so here goes . I have a 2015 Z06 , love the car and the power . The car was making 605 rwhp and I think 590 rwt when some mods were done last year , this year , I went with the pro charger set up with Alky . Car now makes 760 rwhp and around 615 rwt , however , the power now comes on way further in the rpm band , as in above 4000 rpm . So the question is , is there a way to cheat the system to bring that power down to start at say 2000 rpm ?
Kazman1960 is offline   Reply With Quote
Old 07-17-2017, 11:41 AM   #2
schpenxel
CF Senior Member
Support Corvetteforum!
St. Jude Donor '15
 
schpenxel's Avatar
 
Member Since: May 2004
Location: Greensboro NC
Posts: 14,375
Thanked 639 Times in 593 Posts
Default

ECS uses a smaller pulley and restrictor plate to help do this but not sure if it'd work well in this application or not. Smaller pulley = more boost earlier, restrictor plate limits airflow up top.

Overall that's just how it is with centri setups, boost increases w/RPM
schpenxel is offline   Reply With Quote
The Following User Says Thank You to schpenxel For This Useful Post:
Kazman1960 (07-17-2017)
Old 07-17-2017, 12:10 PM   #3
Kazman1960
CF Senior Member
Thread Starter
 
Member Since: Aug 2014
Location: Timmins Ontario
Posts: 172
Thanked 12 Times in 10 Posts
Default

Quote:
Originally Posted by schpenxel View Post
ECS uses a smaller pulley and restrictor plate to help do this but not sure if it'd work well in this application or not. Smaller pulley = more boost earlier, restrictor plate limits airflow up top.

Overall that's just how it is with centri setups, boost increases w/RPM
Yeah , I had a centri on my 97 cobra , that was the same ,all high rpm,s , I like the idea of the smaller pulley and restrictor plate . I wonder if its available for Pro charger F1A set up ?
Kazman1960 is offline   Reply With Quote
Old 07-17-2017, 12:27 PM   #4
schpenxel
CF Senior Member
Support Corvetteforum!
St. Jude Donor '15
 
schpenxel's Avatar
 
Member Since: May 2004
Location: Greensboro NC
Posts: 14,375
Thanked 639 Times in 593 Posts
Default

No clue, I don't know much about Prochargers. Perhaps someone else will know.
schpenxel is offline   Reply With Quote
Old 07-17-2017, 01:22 PM   #5
mesparza
CF Member
 
mesparza's Avatar
 
Member Since: Nov 2016
Posts: 59
Thanked 5 Times in 5 Posts
Default

Down in the 2k range isn't going to be possible. Don't know why you would want to be flooring at 2k either.

The next best best thing without raising peak power is to look at something similar to the " Beefcake Torque Booster" that the Mustang guys use. Along with a smaller pulley.
mesparza is offline   Reply With Quote
Old 07-17-2017, 04:39 PM   #6
FYREANT
I'm Batman..
Support Corvetteforum!
 
FYREANT's Avatar
 
Member Since: Apr 2014
Location: Lehigh Acres FL
Posts: 3,273
Thanked 199 Times in 134 Posts
Default

You want power down low? Downgrade to a smaller head unit. Thats about the only way..
FYREANT is online now   Reply With Quote
Old 07-17-2017, 10:03 PM   #7
Kazman1960
CF Senior Member
Thread Starter
 
Member Since: Aug 2014
Location: Timmins Ontario
Posts: 172
Thanked 12 Times in 10 Posts
Default

Quote:
Originally Posted by mesparza View Post
Down in the 2k range isn't going to be possible. Don't know why you would want to be flooring at 2k either.

The next best best thing without raising peak power is to look at something similar to the " Beefcake Torque Booster" that the Mustang guys use. Along with a smaller pulley.
Thanks , I checked that out , something like that is exactly what I was thinking about , it shifts the power band lower down the rpm range .
Kazman1960 is offline   Reply With Quote
Old 07-19-2017, 05:28 AM   #8
BrunoTheMellow
CF Senior Member
 
BrunoTheMellow's Avatar
 
Member Since: Jan 2015
Posts: 569
Thanked 82 Times in 58 Posts
Default

How are you even able to get traction? The only gear that will go that low would be 1st. Every other gear shifts above 4k rpm even short shifting. At your power levels, a torque curve leaning to the upper RPMs is actually helpful. If you wanted torque at 2k rpm, should have stuck to the overspun heat pump.

Last edited by BrunoTheMellow; 07-19-2017 at 05:29 AM.
BrunoTheMellow is offline   Reply With Quote
Old 07-19-2017, 08:12 AM   #9
Kazman1960
CF Senior Member
Thread Starter
 
Member Since: Aug 2014
Location: Timmins Ontario
Posts: 172
Thanked 12 Times in 10 Posts
Default

Quote:
Originally Posted by BrunoTheMellow View Post
How are you even able to get traction? The only gear that will go that low would be 1st. Every other gear shifts above 4k rpm even short shifting. At your power levels, a torque curve leaning to the upper RPMs is actually helpful. If you wanted torque at 2k rpm, should have stuck to the overspun heat pump.
Good point , however , you need to look at the torque curves on the Dyno s to see what I mean , another good point is the overspun heat pump issue . While I didn't see the dreaded overheating issue , I think it was only a matter of time while exploring bolt ons . If Whipple had released their blower , I may have gone with that . The pro charger is a great unit , I just want a little more torque coming off idle , that's all
Kazman1960 is offline   Reply With Quote
Old 07-19-2017, 12:05 PM   #10
blown81bu
CF Senior Member
 
blown81bu's Avatar
 
Member Since: Aug 2007
Posts: 3,213
Thanked 162 Times in 121 Posts
Default

what pulley u using and what blower?
blown81bu is offline   Reply With Quote
Old 07-19-2017, 12:27 PM   #11
DOUG @ ECS
Premium Supporting Vendor
 
DOUG @ ECS's Avatar
 
Member Since: Oct 2004
Location: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Posts: 21,953
Thanked 224 Times in 192 Posts
Default

Quote:
Originally Posted by Kazman1960 View Post
Yeah , I had a centri on my 97 cobra , that was the same ,all high rpm,s , I like the idea of the smaller pulley and restrictor plate . I wonder if its available for Pro charger F1A set up ?

The restrictor plate is only good in a small window. It would not work well on an F1X build in my experience. The IAT's out way the TQ increase.

On a low boost car, stock type build it has a small window off efficiency where the tq gain overcomes the IAT difference and it works great, not so much on big boost though.
DOUG @ ECS is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Bringing boost lower down the rpm range
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    [Z06] Dyno results after mods without cam keeso6z C6 Corvette ZR1 & Z06 25 01-01-2017 08:00 AM
    same power, different power adder, same results??? Dtownbrown C5 Forced Induction/Nitrous 8 08-13-2014 10:10 PM
    Just installed, Tony Mamo ported Fast 90/90 2Qwik1 Performance Results 26 01-29-2007 07:23 PM
    Andy forgot one thing on my car... BADBLACK99 C5 Forced Induction/Nitrous 18 10-20-2004 08:45 AM
    Halltech beats Vararam on the Dyno.. opticZ06 C5 Z06 Discussion 32 12-21-2003 09:10 PM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 12:34 AM.


     
    • Ask a Question
      Get answers from community experts
    Question Title:
    Description:
    Your question will be posted in: