Warm up time

[beefaroni]

Manual states: wait 20sec and drive. I follow that, and keep below 3k until oil temps up (roughly 10mi).

Why is cold start so damn lumpy up front. Certainly not enjoyable. Assume emissions something


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Because the timing is literally retarded (overly PC people, eat your hearts out) to help heat the cats and incrementally moves towards normal over the course of a minute or so. The exact duration I am unsure.

[Exclusivs]

I actually like the slightly temperamental cold start. It should be smooth but a little alive if that makes sense.

Maybe

Or maybe a us cats in headers thing


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[Icecream]

Manual states: wait 20sec and drive. I follow that, and keep below 3k until oil temps up (roughly 10mi).

Why is cold start so damn lumpy up front. Certainly not enjoyable. Assume emissions something


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I actually like the slightly temperamental cold start. It should be smooth but a little alive if that makes sense.

[Exclusivs]

Manual states: wait 20sec and drive. I follow that, and keep below 3k until oil temps up (roughly 10mi).

Why is cold start so damn lumpy up front. Certainly not enjoyable. Assume emissions something


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[Tbonem3]

What does that have to do with you sitting in your car for 5 minutes before driving off?

[Lukem3]

All cold start is doing is adding air to the exhaust to lean it out to get hotter (post-combustion, not like your engine burning lean). You should just drive, cold start or not.

On the secondary injection pump sure, but the motor itself runs rich when in cold start (open loop)

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[yhp2009]

All cold start is doing is adding air to the exhaust to lean it out to get hotter (post-combustion, not like your engine burning lean). You should just drive, cold start or not.

I mostly do it cuz im ignorant on this and i like to stay on the side of caution. But if youre right thats what i should do tho

[Tbonem3]

All cold start is doing is adding air to the exhaust to lean it out to get hotter (post-combustion, not like your engine burning lean). You should just drive, cold start or not.

[yhp2009]

I know many of you guys are saying drive off immediately but do you not wait for the revs to drop from the cold start before pulling off?

I do that. I think beefaroni is pointing to the same with the secondary air pump

[MTiz]

I know many of you guys are saying drive off immediately but do you not wait for the revs to drop from the cold start before pulling off?

[Mystic3]

Agree with beefaroni to the letter.

[beefaroni]

Take the oil out, put it in oven set to 200F and pour it back in and off to 8k RPM instantly

Pro tip: Bake oil in teflon coated pans and some of the teflon will leech into the oil and win you some bonus lube

[beefaroni]

I normally wait long enough for the secondary air pump to shut off (45 sec-1 minute?) if you observe the ignition timing for warmup/emissions it starts near 0 advance (you can hear some interesting combustion sounds in the during the first few seconds from the late ignition timing) and ramps up slowly to the base timing.

Once the SAP shuts off thats my cue. Nothing magical about it but its at least enough time to get the cats warmed up and an easy and consistent marker to work with

[Mspir3d]

Nah, I don't believe our pistons are forged, I have never heard piston noise on our engines like a POS GM V8 slapping pistons around and idling is not recommended in the owners manual. Unless your engine is not stock, then you can decide your own warm up .

You’re correct, stock pistons are cast. Mine are forged and have a little extra room because I run just under 30 psi on stock compression.

[BMWahba]

Yep, I start up and drive off immediately, keeping it under 3-3.5k until oil temp is fully warmed up.