Originally Posted by
Eivind E
Ok, so here's the bottom line on this.
You have a tki3 buggy which should be shredding on bottom end with this engine and pipe.
So the explanation is elsewhere.
From what you write:
- 1.0 clutch should be enough, 1.1 clutch? WHY?
- Carburation:
- From your explanation it sounds that you are excessively lean on top, the p5xlt shouldn't be "lightning fast" down the straight it should be mediocre. Lean top end can restrain the initial takeoff grunt of an engine, this is choking the engine and not allowing enough flow and even pressure is being restricted. So you probably need to open up the top end maybe as much as one half turn on the clock.
- 6 venturi? WHY?? You should be running a 7 on this engine.
- Leave the pipe and manifold alone, this should be plenty perfect. You should with a proper tune have a grunty bottom end and a mediocre top end down the straight.
- Please check your idle gap. It should be "as small as possible", if you by some reason have a large idle gap it is the same as being rich on bottom in terms of performance. You should probably be in the area of 0.4mm-0.6mm idle gap, I'm not 100% on that as I never measure I just do it by ear. The correct idle gap and correct leanness of the bottom end will allow for rpm's on idle to be in the correct zone, and a crisp bottom end will be obtained.
- I like to repeat this, if this engine is screaming down the straight and faster than all other cars, you have an excessively lean top end. With this pipe and this engine you should be "medium fast" down the straight compared to others. You should not suddenly gain speed halfway down it. It should probably peter out halfway down and maintain same speed the last half. IF THE CAR IS SUDDENLY GAINING SPEED HALFWAY DOWN THE STRAIGHT, YOUR TOP END IS SO LEAN THAT YOU CAN RUIN THE ENGINE
I appreciate your advice but I can do without ??? Why's.........in my post I think it's clear that I am new to this. If it wasn't clear...... hey yeah I am new to this.
1.1 clutch springs WHY??? = 1.1's are stock springs in the Ready Set Kit, When I swapped out the Kyosho motor I put new 1.1's on the nova along with blue shoes. 1.0's would compound the problem at this point would they not?
6.0 - 6.5 Venturi WHY??? = Just want decent mileage.....I would like to get 11 minutes out of a tank of fuel. Is an 11 minute run time attainable with the 7.0 Venturi?
I have read the tuning bible sticky and have attempted to obtain a "balanced" tune with a minimal idle gap. I will go back to the drawing board and re-tune. Thursday evening I felt my tune was spot on. Unfortunately Friday night racing brought quick dropping temperatures, drizzle, and rain which made tuning even more complex than normal.... But like I said the flat spot in the low end has always been a bit of a problem. As far as the back straight goes I do seem to be faster than most cars......that being said I can't say I get a burst of speed halfway down the straight.