3.3 turbo HPFP sound (clatter) normal sound

[D.J.]

Was talking to a friend about our HPFP sound during cold start up, the normal sound.

Decided to take a video and overlay some OBDII DATA (coolant temp, RPM, oil temp, ambient temp, intake air temp).

Video depicts first start of the day, when coolant temp = ambient air temp.
@ ~ 25s fan shuts off (audible)
@ ~ 33s there is a noticeable reduction in sound from the HPFP, coolant temp = 36°C (97°F)

Not sure why the fan runs for first ~25 seconds. The HVAC is OFF during this video

Video is long and boring, but has the time since engine start overlaid in bottom right corner, so easily to scroll through.
Also shows real time temperatures over the 5 minutes.

Takes a full 2 minutes to drop below 1000 rpm @ 25°C (77′F) ambient temp.


Hopefully people might watch this before asking "is this sound normal" when hearing their normal HPFP on a cold start.

 

[5tinger]

Wow very nice informative video.
That fan noise, is it not the vacuum pump? I always hear it for the first 20 seconds of the cold start.

 

[D.J.]

Wow very nice informative video.
That fan noise, is it not the vacuum pump? I always hear it for the first 20 seconds of the cold start.

I am actually unsure.... So you may be correct.

When it shuts off, it sounds to me like a fan spooling down.

I will pay closer attention next time and actually look to see if it is the main fan or not.

 

[bfglitch]

Hopefully people might watch this before asking "is this sound normal" when hearing their normal HPFP on a cold start.

Hopeful but sadly doubtful. The people who usually ask that question don't bother with the search function of the forums, considering it's been asked and answered numerous times.

 

[chxei]

Damn that took too long to heat up. What engine oil do you use?

 

[D.J.]

Hopeful but sadly doubtful. The people who usually ask that question don't bother with the search function of the forums, considering it's been asked and answered numerous times.

Well, at least now we can point them here!

 

[D.J.]

Damn that took too long to heat up. What engine oil do you use?

Usually, Mobil 1™ 5W30 Synthetic Engine/Motor Oil - when it's on sale.

Presently using, Kirkland Signature 5W30 Full Synthetic Oil.

But I don't notice any difference whatsoever with respect to warm up speed, not did I expect to.

 

[D.J.]

Damn that took too long to heat up. What engine oil do you use?

I recorded this data a few months ago, might be interesting to you.

Temperature data, recorded over 1 hour

 

[D.J.]

Wow very nice informative video.
That fan noise, is it not the vacuum pump? I always hear it for the first 20 seconds of the cold start.

I was incorrect. It's 100% NOT the fan.

I guess it Is the vacuum pump. Why do we need an electric vacuum pump for the first ~20 seconds? I thought this vacuum pump was to maintain vacuum assisted brakes during ISG operation?

 

[StingerRwd]

It’s to heat up the catalytic converter

 

[oddball]

The vacuum pump is needed because the engine may not consistently pull enough vacuum for the booster. Usually want minimum 16" vacuum, but better to have 20" or more. Idle tends to be around 10" to 11" manifold vacuum, so the pump makes up the difference. The pumps don't move a ton of air, so it takes a little while.
I put a pump similar to this one in my classic car for the same reason (no turbo, just a big lazy engine). These are MUCH quieter than the older designs. Vacuum pumps used to be piston pumps, like those cheap tire inflators. Imagine having one of those churning away all the time!

 

[Thomby]

I came across some other forums posts about sourcing HPFP covers from other models to reduce the clatter (I think it was Ecoboost 4 cylinders, maybe higher trim models or later years added it for NVH?). So I figured I'd see if my cover could be shored up with sound deadening material or replaced with a more substantial one.

Well what I thought was just a thin shell turned out to be about 1/2-3/4" thick, fairly dense rubberized foam, covering ~90% of the pump. So I guess they did as good a job as they could...can't imagine how noisy it would be without. Unfortunately there doesn't seem to be much room for improvement, maybe possible to wrap where the fuel line exits and across the split in the foam but not a ton of room to layer more around it.

Kia Parts Now shows 35340A (top left) as the 4cylinder part number and 353453L200 as the 6cyl, but the 6cyl diagram has 35340A, so I think it's the same piece:

353453L200 Genuine Kia Foam-Pump

Genuine 353453L200 Foam-Pump fits 2018-2023 Kia K900, Stinger. KiaPartsNow offers 353453L200 for $18.35.

www.kiapartsnow.com

Well w

 

[djerickd]

I don't think the foam does much, does it?

 

[djerickd]

The vacuum pump is needed because the engine may not consistently pull enough vacuum for the booster. Usually want minimum 16" vacuum, but better to have 20" or more. Idle tends to be around 10" to 11" manifold vacuum, so the pump makes up the difference. The pumps don't move a ton of air, so it takes a little while.
I put a pump similar to this one in my classic car for the same reason (no turbo, just a big lazy engine). These are MUCH quieter than the older designs. Vacuum pumps used to be piston pumps, like those cheap tire inflators. Imagine having one of those churning away all the time!

was wondering thank you

 

[Thomby]

I don't think the foam does much, does it?

It's pretty substantial, and probably as good as anything I would've added. Maybe a dynamat-style coating (tar under heavy foil wrap) with foam around it would be better? But I agree that the noise is still pretty noticeable, enough that I wanted to reduce it.

Reminds me of bad lifter tick, and that if the engine ever does develop another noise it's likely to be masked by the HPFP.