I am curious to know if jetting has any effect on idle quality at all. Common sense tells me that it wouldn't affect the idle circuit but everytime I jet up to support the motor in cool air my 750 and now this 950HP is giving me fits at the stoplight.
Tonight I switched out my 750 DP for a Davinci 950 HP and all I can say is WOW. The throttle response is razor sharp and even feels stronger in the mid range but I am having intermittent problems maintaining a consistent idle in gear.
The carb is used and came jetted 85 all the way around. Primary Power valve is 6.5, secondary is plugged, and all four throttle blades are drilled (not sure size just yet).
All four idle adjust screws are set at 1.5 turns out and the car will respond to adjustment (it dies if I start turning them down to 1/2 turn). The car idles nice and crisp at 950 - 1000 with 10-11 in vac. Great throttle response. Sometimes when it goes in gear it maintains nice vacuum and 900 rpm. Othertimes, especially coming off the throttle at a stop light the idle hunts up and down (500 - 900rpm) with the vacuum bouncing up down between 10 - 5). If I put it in neutral and rev the engine once or twice it will usually clean up and allow it to idle cleanly in gear. All I can think of is the excess jetting is loading the engine up with excess fuel at times???
I realize the factory 950hp comes with 79's all the way around but I wanted to try the carb as is since Davinci set it up that way. I will say that I had similar issues begin to manifest itselft with my 750DP (jetted 74/86) as well, which makes me think poss vacuum leak?? I have sealed the intake, blower, and carb twice looking for a leak but no luck.
Any advice/experiences would be much appreciated.
Tonight I switched out my 750 DP for a Davinci 950 HP and all I can say is WOW. The throttle response is razor sharp and even feels stronger in the mid range but I am having intermittent problems maintaining a consistent idle in gear.
The carb is used and came jetted 85 all the way around. Primary Power valve is 6.5, secondary is plugged, and all four throttle blades are drilled (not sure size just yet).
All four idle adjust screws are set at 1.5 turns out and the car will respond to adjustment (it dies if I start turning them down to 1/2 turn). The car idles nice and crisp at 950 - 1000 with 10-11 in vac. Great throttle response. Sometimes when it goes in gear it maintains nice vacuum and 900 rpm. Othertimes, especially coming off the throttle at a stop light the idle hunts up and down (500 - 900rpm) with the vacuum bouncing up down between 10 - 5). If I put it in neutral and rev the engine once or twice it will usually clean up and allow it to idle cleanly in gear. All I can think of is the excess jetting is loading the engine up with excess fuel at times???
I realize the factory 950hp comes with 79's all the way around but I wanted to try the carb as is since Davinci set it up that way. I will say that I had similar issues begin to manifest itselft with my 750DP (jetted 74/86) as well, which makes me think poss vacuum leak?? I have sealed the intake, blower, and carb twice looking for a leak but no luck.
Any advice/experiences would be much appreciated.
