High RPM on chilly days

[Tuhin]

Hi everyone! First post here. Got some great tips when I was shopping for my Raptor, so thank you.

Question is regarding engine revs. I warm up my Raptor for about 30 seconds to 1 minute and then set off, driving with a very light foot until the engine sounds relaxed.

I have noticed the revs stay quite high (~2000) even in 10th gear for the first 5-10 minutes. The revs eventually settle down though. However, if I make a quick stop and then start it up again, the idle revs are much lower. Is this normal? Apologies if this is a routine question. I simply want to make sure I don’t do anything that is harmful for my Raptor.

 

[goblues38]

NO and unpossible.

The 1st few gears use the torque converter in the transmission. It is possible to see slightly higher RPM's as the fluid warms up. But only slightly. And it should go to normal inside 1-2 mins.

It is unpossible for the RPMS to be higher then the gear ration above 5th gear i believe (dont know exactly) as at some point, the tourque converter is taken out of the loop and a 1 to 1 locked connection takes place.

 

[Tuhin]

NO and unpossible.

The 1st few gears use the torque converter in the transmission. It is possible to see slightly higher RPM's as the fluid warms up. But only slightly. And it should go to normal inside 1-2 mins.

It is unpossible for the RPMS to be higher then the gear ration above 5th gear i believe (dont know exactly) as at some point, the tourque converter is taken out of the loop and a 1 to 1 locked connection takes place.

Thanks for your reply. I should also mention I saw 2000 rpm on a hill while in 10th gear and the engine was not fully warmed up at that point. Once I reach the top of the hill and gave it a bit of gas, the revs dropped a fair amount. What was weird was the transmission kicked down to 9th gear and the revs were lower at the same speed as I was in 10th.

 

[1BAD454SSv2]

I believe the torque convertor does not lock till trans fluid , coolant all hit a certain temperature. Rpm is higher till it locks.

 

[FordTechOne]

Normal.

The TCM strategy is designed to warm up the transmission fluid as quickly as possible. When the transmission is cold, converter lockup is inhibited. If the transmission was slipping, the TCM would set DTCs which you’d see as a Wrench light and warning message.

 

[Tuhin]

Normal.

The TCM strategy is designed to warm up the transmission fluid as quickly as possible. When the transmission is cold, converter lockup is inhibited. If the transmission was slipping, the TCM would set DTCs which you’d see as a Wrench light and warning message.

I believe the torque convertor does not lock till trans fluid , coolant all hit a certain temperature. Rpm is higher till it locks.

Thank you both for this info. Definitely a good education! Can driving off too early damage any part of the engine or the transmission? From everything I've researched, it's okay to drive off without warming up your car for more than a few seconds provided you drive it gently until everything is at the right temperature. But, seeing as the transmission and engine both behave differently when not at their optimal temperatures, I'm a bit concerned about long-term effects.

 

[FordTechOne]

Thank you both for this info. Definitely a good education! Can driving off too early damage any part of the engine or the transmission? From everything I've researched, it's okay to drive off without warming up your car for more than a few seconds provided you drive it gently until everything is at the right temperature. But, seeing as the transmission and engine both behave differently when not at their optimal temperatures, I'm a bit concerned about long-term effects.

It’s always best to let it warm up for a least a few seconds before driving off. As long as you drive it easy when cold it will be fine; that is the purpose of the cold start strategies you’re asking about.

 

[Tuhin]

It’s always best to let it warm up for a least a few seconds before driving off. As long as you drive it easy when cold it will be fine; that is the purpose of the cold start strategies you’re asking about.

Perfect, thanks a lot! This has been super helpful in clearing things up.