Search found 2739 matches

by ptuomov
Wed Apr 10, 2024 8:33 am
Forum: Engine Tech
Topic: Highest power exhaust for GSX-R750 L1 2011-2023?
Replies: 113
Views: 444982

Re: Highest power exhaust for GSX-R750 L1 2011-2023?

Any opinions about how to best track the cooling system efficiency for the GSX-R750 engine?
by ptuomov
Sat Mar 30, 2024 9:29 am
Forum: Engine Tech
Topic: Highest power exhaust for GSX-R750 L1 2011-2023?
Replies: 113
Views: 444982

Re: Highest power exhaust for GSX-R750 L1 2011-2023?

I don't think a gixxer 1000 is allowed in Extreme Kross Kart. The other two numbers for runs 128 and 130 are the 750. :) This is with gas station pump gas with 5% ethanol and 98 Euro octane rating: 25fcffb6-533f-47f5-aa76-120d70165143.jpeg The ramp up in the torque curve is where the operator fully...
by ptuomov
Sat Mar 30, 2024 4:29 am
Forum: Engine Tech
Topic: Highest power exhaust for GSX-R750 L1 2011-2023?
Replies: 113
Views: 444982

Re: Highest power exhaust for GSX-R750 L1 2011-2023?

Current state on P1 WRX gasoline:
9245da04-c935-426e-9506-8510c9e8f570.jpeg
by ptuomov
Wed Jan 10, 2024 6:34 pm
Forum: Engine Tech
Topic: Highest power exhaust for GSX-R750 L1 2011-2023?
Replies: 113
Views: 444982

Re: Highest power exhaust for GSX-R750 L1 2011-2023?

Wired up:
29db3d0d-6e6d-45c4-8ea0-af5b10551cfc.jpeg
by ptuomov
Tue Jan 02, 2024 7:48 pm
Forum: Chassis / Suspension / Body
Topic: Crosskart Xtreme best center of gravity height?
Replies: 50
Views: 68281

Re: Crosskart Xtreme best center of gravity height?

Thank you got this post! It’s currently way above my pay grade but a great roadmap of what I need to learn about. Thank you. I need more info regarding what adjustments were made. Is the video after the adjustments or before? Does stiffening all the settings mean just turning screws for increased co...
by ptuomov
Tue Jan 02, 2024 8:10 am
Forum: Chassis / Suspension / Body
Topic: Crosskart Xtreme best center of gravity height?
Replies: 50
Views: 68281

Re: Crosskart Xtreme best center of gravity height?

No updates on the geometry as I'll be on the other side of the world for the next little while. However, they did ice-track test the car with new tires. Initially, the car had understeered somewhat in the corners. That was cured however by making all settings in the rear shocks much stiffer and the ...
by ptuomov
Tue Jan 02, 2024 7:32 am
Forum: Engine Tech
Topic: Highest power exhaust for GSX-R750 L1 2011-2023?
Replies: 113
Views: 444982

Re: Highest power exhaust for GSX-R750 L1 2011-2023?

It's even possible an exhaust system that should be symmetrical will run like it isn't. I don't think you will have to worry about that, but, it happens a lot more than people think. Why would a symmetric and even-firing engine run very differently in different cylinders because of the exhaust? Is ...
by ptuomov
Mon Jan 01, 2024 3:06 pm
Forum: Engine Tech
Topic: Highest power exhaust for GSX-R750 L1 2011-2023?
Replies: 113
Views: 444982

Re: Highest power exhaust for GSX-R750 L1 2011-2023?

A general observation from running a bunch of EngMod4t simulations: The individual cylinder trim is influenced both by unequal intake trumpet lengths and non-symmetric exhaust design. The exhaust configuration matters much more at low rpms and the intake configuration much more at high rpms. For an ...
by ptuomov
Mon Jan 01, 2024 9:27 am
Forum: Engine Tech
Topic: Highest power exhaust for GSX-R750 L1 2011-2023?
Replies: 113
Views: 444982

Re: Highest power exhaust for GSX-R750 L1 2011-2023?

What kind of individual cylinder fuel trim maps do you guys use with equal-length intake trumpets and sequential tri-y motorcycle exhaust?
by ptuomov
Mon Dec 25, 2023 9:38 am
Forum: Chassis / Suspension / Body
Topic: Crosskart Xtreme best center of gravity height?
Replies: 50
Views: 68281

Re: Crosskart Xtreme best center of gravity height?

OP ...... if the 'car' is handling properly and you're only trying to improve the 'holeshot', you might be going down a rabbit hole with that, unless it's like UK 'grasstrack' racing where whoever wins the standing start 'drag race' into the first corner can become almost impossible to pass, even b...
by ptuomov
Mon Dec 25, 2023 2:19 am
Forum: Chassis / Suspension / Body
Topic: Crosskart Xtreme best center of gravity height?
Replies: 50
Views: 68281

Re: Crosskart Xtreme best center of gravity height?

"Get me those hard points and I’ll create a simple mbd car model and create all the necessary points to analyze all the suspension kinematics." I will likely take you up on the offer once I come back from the travels, thank you! "If I understand the “problem description”, when the kar...
by ptuomov
Sun Dec 24, 2023 5:44 pm
Forum: Chassis / Suspension / Body
Topic: Crosskart Xtreme best center of gravity height?
Replies: 50
Views: 68281

Re: Crosskart Xtreme best center of gravity height?

Tom68 wrote: Sun Dec 24, 2023 4:32 pm Roll center.

EDV-CR110.jpg

Cars don't body roll around a center.

These ones almost did, until they start to roll and the slides on an angle.
Ok so how I read this is that you think the roll center is not a useful concept.
by ptuomov
Sun Dec 24, 2023 5:41 pm
Forum: Chassis / Suspension / Body
Topic: Crosskart Xtreme best center of gravity height?
Replies: 50
Views: 68281

Re: Crosskart Xtreme best center of gravity height?

I think that the track cars that lift the front wheel when cornering on track likely have the front roll center higher than rear roll center. All those cool photos with the inside front wheel in the air… When a vehicle lifts the inside front wheel when cornering, 100% of the lateral weight transfer...
by ptuomov
Sun Dec 24, 2023 5:36 pm
Forum: Chassis / Suspension / Body
Topic: Crosskart Xtreme best center of gravity height?
Replies: 50
Views: 68281

Re: Crosskart Xtreme best center of gravity height?

What’s the specific input?