Vr6 : a lot faster cold than warm!

[Tristan Carson 10]

Is this normal ? My vr6 goes like hell when it's cold, accelerates like a steam train. But when the engine is warm it's a lot slower.

[fendervg 32]

That's normal - it needs to be at about 80 degrees coolant before the standard ECU cycle and 02 kick in. Cold air helps as well.

[mr.ots 10]

Ambient air temperature makes a difference as cold air is more dense which requires more fuel for the correct air/fuel ratio resulting in greater combustion, but I wouldn't expect a significant difference between a cold and hot engine. If anything mine runs better when it's warmed up.

[maff 10]

I don't give any car i own any stick until the oil is warm, it doesn't do a fat lot cold, water temp may warm up quick but i'd wait until 80 degrees before giving the vr engine any grief. Definatly the cold air combined with a rich mixture when cold that will make it feel quick though.

[mr.ots 10]

Yep agreed, keep mine below 3k revs until the oil temp hits 80 degrees

[sexybourbon 0]

Yep no poing caning it till its up to temps you just shag it up quicker

[Jim 2]

Yeah - you're sealing an early fate for your engine if you're ragging it from cold. Oil needs to get up to temperature to provide the correct lubrication at higher revs.

[Kevin Bacon 5]

That's normal - it needs to be at about 80 degrees coolant before the standard ECU cycle and 02 kick in. Cold air helps as well.

 

O2 kicks in at 70 deg but yep, that's what a VR6 feels like when it's running a bit rich. i.e how it should be run! As soon as the O2 kicks in, the change is immediate. Less responsive, lumpier idle etc etc.

[Jim 2]

Presumably you could remap the engine for this - so massively increase the fuelling, and advance the timing - but then would just end up with utterly woeful fuel economy?

[Kevin Bacon 5]

MPG doesn't have to be woeful. Remember I was averaging 27mpg in my VRT run by a standalone. During my experimentations the VR6 runs a LOT better when fuelled richer than standard, especially in the idle.