dead start hiccup
OK, most people will never see this problem. And its not so much of a problem as a minor annoyance with racing. I race harescrambles (GNCC) and we have a deadstart. This only happens on a deadstart. I hit the start button, it fires up and when I stab the throttle it boggs for a second, sometimes dies, and then runs great. This will not happen if i come to a stop and then stab the throttle, only if i turn the quad off, and start it and stab. One other thing, I have a rekluse so there is no revving the motor up then letting the clutch out. Once it hits the right rpms, like 2200 it starts engaging.
I don't know if this is too much fuel from the start or if it can even be cured. Let me know your thoughts.
I don't know if this is too much fuel from the start or if it can even be cured. Let me know your thoughts.
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- Joined: Wed Mar 10, 2021 10:41 pm
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- Joined: Wed Mar 10, 2021 10:41 pm
It seems we may need to come up with a remote-control activated bump of the system, to wake up the ecu, prime the fuel pump, and position the stepper.... that would be trick, and kind of MI III sneaky (he he). Easy to test by just bumping it, pausing for however long you need, and then trying a so-called half-dead start. If the problem goes away, visit the junkyard for a keypod and 12V solenoid! LOL.
I did play with the cold start setting and it did get better. Now it hesitates but doesn't stall. Not the best but it is better. As for blocking off the IACV I did before and it ran horrible on startups. I am not going back to that. Something I have thought about is a manual IACV like the LTR450 has. I don't know how to get to that point but I am going to examine the option.
I will also try and play with the half dead dead start this next weekend.
I will also try and play with the half dead dead start this next weekend.
Also check the TS setting on your map. I've checked many of these "stroker" maps and the TS has been changed to 110 - far too low on the Transient Sensitivity for any motor with increased air volume via stroker, airbox or exhaust mods. I've mapped a stroker motor with TS at 130 and would recommend the stock setting of 150 to compensate for that volume.
As a quick refresher, the Transient Fueling is for just that purpose noted in this post. The values in our maps come from a motor running at a steady state (constant throttle and constant RPM). When the throttle is cracked open, there needs to be compensation for the rush of air - a low TS will cause a lean condition and a stall.
As Acarli noted the Throttle Offset will also help as it adds fuel to compensate for air that "leaks" past the throttle body butterfly.
As a quick refresher, the Transient Fueling is for just that purpose noted in this post. The values in our maps come from a motor running at a steady state (constant throttle and constant RPM). When the throttle is cracked open, there needs to be compensation for the rush of air - a low TS will cause a lean condition and a stall.
As Acarli noted the Throttle Offset will also help as it adds fuel to compensate for air that "leaks" past the throttle body butterfly.