Results 1 to 5 of 5

Thread: S2+ Af Ratio??

  1. #1

    S2+ Af Ratio??

    Does anyone know the AF ratio off the 2+ stage on sea level and ext XS ic?

    Thanks Jim


  2. #2

    Join Date
    Aug 2006
    Location
    Gonzales, La
    Posts
    2,145
    +1
    9
    According to a Riva dyno test, the true Stage 2 runs 11.3 from bottom to top.

    Mike

  3. #3
    Quote Originally Posted by engineermike View Post
    According to a Riva dyno test, the true Stage 2 runs 11.3 from bottom to top.

    Mike
    11.3 with 38,s. so i think the 42´s will cover nicely up for the added s3sc.
    i know a lott off people run the s2+ with great succes, i was just wondering if someone measered this setup.

    ciao jim

  4. #4
    Dave Sharp dav_dman's Avatar
    Join Date
    Aug 2005
    Location
    louisville Ky/so. IN
    Posts
    1,453
    +1
    1
    Quote Originally Posted by engineermike View Post
    According to a Riva dyno test, the true Stage 2 runs 11.3 from bottom to top.

    Mike
    so that riva wheel is like the green and the LesC-A, right?

    or better yet..will i run 11.3 with LesC-A wheel, air intake, external IC? or do i need to put in 42# injectors as well?

    I did a search and found people with both setups..but a/f in the 11's is what i want.

  5. #5

    Join Date
    Aug 2006
    Location
    Gonzales, La
    Posts
    2,145
    +1
    9
    The Les cook A-wheel is very similar to the Rotax Racing wheel and the Greenwheel. The Vortech/Riva S2 wheel is smaller and makes less boost.

    From what I've read. . .

    Riva S2 wheel/stock IC - 39's (72-73 mph)
    Riva S2 wheel/external IC - 39's (75-76 mph)
    RR/A/Green wheel/stock IC - 39's (74-75 mph)
    RR/A/Green wheel/external IC - 42's (77-78 mph)
    Riva S3 wheel/stock IC - borderline 39's/42's (76-77 mph)
    Riva S3 wheel/external IC - 42's (79-80 mph)

    Mike

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. AF ratios with BEGi
    By R88ory RXP in forum 4-Tec Performance
    Replies: 10
    Last Post: 08-04-2009, 07:25 AM
  2. AF ratio Gauge or LM1
    By R88ory RXP in forum 4-Tec Performance
    Replies: 2
    Last Post: 09-13-2008, 02:09 AM
  3. CHANGES IN ENGINE COMPRESS RATIO UPON ENGINE PERFORMANCE
    By ABBOTT in forum Yamaha How To & FAQs
    Replies: 0
    Last Post: 02-15-2006, 10:45 PM
  4. ONLINE ENGINE COMPRESSION RATIO CALCULATOR
    By ABBOTT in forum Yamaha How To & FAQs
    Replies: 0
    Last Post: 02-15-2006, 10:30 PM
  5. Just installed my digital boost and A/F ratio gauges
    By Green Hulk in forum 4-Tec Performance
    Replies: 26
    Last Post: 01-25-2006, 06:36 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •