Stall starts
Submitted: Saturday, Mar 04, 2006 at 22:27
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Rob from Cairns Offroad Training & Tours
We were discussing stall starts a while back and someone mentioned there was something you could disconect on a fuel injected petrol to stop them luching backwards. I have not been able to find that post in the archives. Does anyone know what you would disconect and where it is located ? Cheers Rob
Reply By: Wayne (NSW) - Sunday, Mar 05, 2006 at 05:43
Sunday, Mar 05, 2006 at 05:43
Rob,
When we teach the stall start recovery we make sure that the right foot has a slight amount of pressure on the brake pedal. When the motor starts is has a slight retard effect with the brakes.
If too much brake pressure is applied and the vehicle stalls again, just go through the proceeder again.
Petrol vehicles that have high gearing are the worst but it can be controlled with this method to a point.
Got go to work this morning,
Stockton Beach for the day. I love this job.
Wayne
AnswerID:
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Follow Up By: Rob from Cairns Offroad Training & Tours - Monday, Mar 06, 2006 at 18:48
Monday, Mar 06, 2006 at 18:48
Yes we do that Wayne but someone mentioned a way of stopping the surge problem in the first place. I trained some people in a v6 hilux the other day and for novice people the initial surge is scarey. Cheers Rob
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Reply By: Peter 2 - Sunday, Mar 05, 2006 at 09:24
Sunday, Mar 05, 2006 at 09:24
Most of the petrol fuel injected vehicles rev the engine at startup to varying degrees, some of the earlier ones it may be a physical thing on the throttle but most of the later ones are fly by wire and it is done by the electronics, no way to override it.
We've had some scary moments when stall starting different vehicles on training days.
Some vehicles are just not intended to be used for what they are 'supposed' to be designed for.
AnswerID:
158669
Reply By: awill4x4 - Sunday, Mar 05, 2006 at 12:03
Sunday, Mar 05, 2006 at 12:03
Rob, I think the control circuit that has to pulled out is the idle stepper control because when the motor is turned off it automatically resets itself in readiness for a "cold start" giving that initial rise in revs of up to 2000 rpm in some cases.
I have heard that prior to 4x4ing to pull the connector off the idle control in the engine bay but to make sure that the AC is off and the wheels are pointing straight so no extra power is being used by the power steering pump thus making the idle stepper increase revs.
I have not tried this myself though. (auto's don't need to worry about stalling :-)
Regards Andrew.
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Follow Up By: Rob from Cairns Offroad Training & Tours - Monday, Mar 06, 2006 at 20:28
Monday, Mar 06, 2006 at 20:28
Hi Andrew I think it was you who told me there was something that could be disconnected? I looked everywhere under the bonnet of this v6 Hilux but coudn't find anything. If only the manufacturers were aware how we really used 4wds in true offroad conditions. I am sure it is something that could be over ridden in low range. Cheers Rob
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