Cold Weather Observations

[accel]

They're really shit all around. I used to think they were good in the summer too, then I got my 2019 with the Michelins. No comparison, the Michelins are way, waaaaaaaay better.

Better ride, better sticksion, better everything. And the Michelins last 2X+ as long. I've got 14K miles, and they don't need replacing yet. I was replacing the Pirelli tires on my 2016 PP1 and 2012 TP cars every 6K-8K miles.

Prellis: i got ~12k from rears while fronts were still in a very good shape.

So I decided to replace just rears to minimize the cost.

Moving forward I'd like to get squared with lightweight aftermarket wheels.

With Pirellis it was very easy to feel a dis balance when fronts and rears have different degree of wear and you can't rotate them.

Staggered is for those who replace tires proactively once first signs of disbalance are there.

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[rxryanm]

I've been reluctant to drive on the Michelin PS4's in the cool/cold weather.

As you should be - they're summer tires and shouldn't be driven in temps less than 50*F.

I bought some Wintrac Pro winter tires and having been bopping about on those for the past almost month. It snowed Christmas Eve and I ha don problems getting anywhere.

 

[5.0 Billy]

As you should be - they're summer tires and shouldn't be driven in temps less than 50*F.

I bought some Wintrac Pro winter tires and having been bopping about on those for the past almost month. It snowed Christmas Eve and I ha don problems getting anywhere.

Have you seen any more snow? I bought mine pre-owned. 17 Performance Package absolutely mint, a Unicorn. Previous owner put on ContiProContacts (All-Seasons). We had snow but I was off that day and the roads were completely cleared by the following morning. I've been debating between the Wintrac Pros or Hakkapeliittas... You're the first person I see running either one of those... curious about your feedback since you've had them on a few weeks now...

 

[rxryanm]

Have you seen any more snow? I bought mine pre-owned. 17 Performance Package absolutely mint, a Unicorn. Previous owner put on ContiProContacts (All-Seasons). We had snow but I was off that day and the roads were completely cleared by the following morning. I've been debating between the Wintrac Pros or Hakkapeliittas... You're the first person I see running either one of those... curious about your feedback since you've had them on a few weeks now...

They've been great. I think they're mainly dry weather winter tires, if my understanding of them was correct. Not made for heavy snow climates like a Nokian. I don't really anticipate any more snow this year - I was honestly surprised we got any in the first place.

 

[engineermike]

2. The engine cycling between PFI and DI doesn't seem to have any rhyme or reason. A few mornings ago I started it at around 30 degrees, and it was clearly running on PFI, no clacking from the DI. The last 2 or 3 mornings it's been starting/warming up on DI, merrily clacking away. Then, coming home and circling the parking lot looking for a space a few evenings ago, the engine was dead silent, clearly running on PFI, while being fully warmed up. Silky smooth and silent.

I'm starting to think that ambient air humidity/temp has something to do with whether it's in PFI or DI mode

Looks like CSER (aka “cat light-off”) mode, it’s always using 40-80% GDI. Based on my logging, that usually only lasts 30 seconds - 2 minutes after cold start. You can tell because spark timing is negative. Once it transitions to the cold GDI blend, it uses 25-50% GDI blend up to 38 deg coolant temp. Once it hits 39 deg, GDI blend goes to basically 0 until load reaches 50%.

 

[NoVaGT]

Looks like CSER (aka “cat light-off”) mode, it’s always using 40-80% GDI. Based on my logging, that usually only lasts 30 seconds - 2 minutes after cold start. You can tell because spark timing is negative. Once it transitions to the cold GDI blend, it uses 25-50% GDI blend up to 38 deg coolant temp. Once it hits 39 deg, GDI blend goes to basically 0 until load reaches 50%.

You're either in LA or Louisiana. I'm not understanding where you have any experience with cold starts, or cold weather driving.

 

[engineermike]

You're either in LA or Louisiana. I'm not understanding where you have any experience with cold starts, or cold weather driving.

Haha, I don’t. I’m just looking at the calibration. CSER happens regardless of temp. The only thing I can’t tell you is how long it stays in CSER.

 

[NoVaGT]

Standing outside the car yesterday, letting it warm up.

Clatter-clatter-clatter-clatter-clatter-clatter.........then quiet. Smooth and quiet.

Got damn bipolar car!!!!

 

[engineermike]

Could be cam phasers.

 

[NoVaGT]

Could be cam phasers.

It's the DI.

You've listened to your own motor, right?

 

[engineermike]

You've listened to your own motor, right?

Yes of course, and gone much further. I’ve upgraded to the XDI HPFP45 and played quite a bit with GDI blend. Honestly, I’ve turned them off and on up to 90% blend and can’t hear a difference. I use vcmscanner, not the sound, to determine the GDI blend, rail pressure, and HPFP duty cycle.

The gen3 did go back to the old oil-pressure actuated phasers for 2 of the 4, which could be affected by cold oil viscosity.

 

[NoVaGT]

Yes of course, and gone much further. I’ve upgraded to the XDI HPFP45 and played quite a bit with GDI blend. Honestly, I’ve turned them off and on up to 90% blend and can’t hear a difference. I use vcmscanner, not the sound, to determine the GDI blend, rail pressure, and HPFP duty cycle.

The gen3 did go back to the old oil-pressure actuated phasers for 2 of the 4, which could be affected by cold oil viscosity.

How were the GENII cam phasers actuated? Electronically?

 

[Mikthehun1]

How were the GENII cam phasers actuated? Electronically?

Not sure, but I think they were set to 'Kill'.

 

[engineermike]

Gen 2 was cam-torque actuated. Gen 3 kept cam-torque actuated on the intake cams but switched back to oil-actuated for exhaust. Ford claims better control while others say it’s due to the increased load from the HPFP. Maybe it’s both....better control needed due to extra load from the fuel pump?

 

[GregP27]

What the heck are PFI and DI?