Results 1 to 5 of 5
  1. #1

    Torque limiting topspeed.

    I read a post about a GTI SE 130 Converted to 185 hp by Rotax racing parts, in search of a higher top speed. By the end of the post 63 mph was the top speed I think. What happend? Did he ever get 68 MPH? A friend of mine that does cylinder head design and porting for topfuel drag cars always told me, you can only increase torque by inrcreaseing cid or compression, or both. On a N/A motor. Power can be increased by Rpm. I wounder if any N/A motor has passed 63 mph. 4 stroke. If not then you could conclude torque limited without the supercharger.


  2. #2
    Having Fun jp1300r's Avatar
    Join Date
    Sep 2005
    Location
    Florida
    Posts
    5,334
    +1
    261
    I had a Kawasaki 06 STX-15F its NA. Best GPSed at 68.4mph before I sold it for my PX. Top speed is not all about power. But lots is needed.

  3. #3
    Increasing torque would increase top speed. Increasing Power would would decrease the time it takes to acheave that speed. Thats just how it works in my mind anyway.

  4. #4

    Join Date
    Aug 2006
    Location
    Gonzales, La
    Posts
    2,145
    +1
    9
    Quote Originally Posted by jay206 View Post
    Increasing torque would increase top speed. Increasing Power would would decrease the time it takes to acheave that speed. Thats just how it works in my mind anyway.
    That's not quite how it works.

    Watch your tach when you hit the gas from a dead stop. On my ski's, it stays between 7500 and 8200 rpm the whole time during acceleration. You want to maximize hp in this range. Forget about torque. By maximizing hp, you also maximize torque in any given rpm range.

  5. #5
    PEST!'s Avatar
    Join Date
    Jun 2008
    Location
    Rockledge Florida
    Posts
    768
    Quote Originally Posted by engineermike View Post
    That's not quite how it works.

    Watch your tach when you hit the gas from a dead stop. On my ski's, it stays between 7500 and 8200 rpm the whole time during acceleration. You want to maximize hp in this range. Forget about torque. By maximizing hp, you also maximize torque in any given rpm range.
    +1 The engine is the same on the 130 but lots of other stuff is needed to make HP and to last. Lower comp and forged pistons cams. Supercharger and matching gears. Injectors and regulaters not to mention ECU.. HP is the answer and Torque is part of the answer. To the point were the pump is inefficient. Then you ad traction control like Yamaha LOL

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 2007 gtx limited need torque specs
    By jetison in forum 4-Tec Performance
    Replies: 0
    Last Post: 01-08-2014, 11:11 AM
  2. RXP RPM Limiting Question
    By Jarrett in forum 4-Tec Performance
    Replies: 40
    Last Post: 07-20-2007, 06:58 PM
  3. Bouncing off the rev limiter, Yay or Nay
    By Gforce in forum 4-Tec Performance
    Replies: 11
    Last Post: 05-29-2005, 01:26 PM
  4. Digital torque wrench
    By Green Hulk in forum Sea Doo Open Discussion
    Replies: 2
    Last Post: 05-25-2005, 04:38 PM
  5. Break in period and Noise at 5000rpms on 05 GTX Limited
    By spc9669 in forum 4-Tec Performance
    Replies: 4
    Last Post: 05-08-2005, 11:30 AM

Posting Permissions

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