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Old 12-04-2017, 05:32 AM   #1 (permalink)
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Default Temperature drop = mpg drop

With the first cold snap, I see. Mpg drop from 5 l/100 km to almost 6 l/100 km.
Will it make sense to cover the radiator to improve warming up?
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Old 12-04-2017, 08:59 AM   #2 (permalink)
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Yep, cold weather hit. Keeping heat in the engine bay is helpful.

I'm a G1 guy and I don't know how helpful grill blocking may be for a G2.

Be careful with "full" grill blocks. If the G2 in-car temp indicator is like the G1, it is very general on actual temp and slow to respond. Easy to overheat the engine. The G1 folks establish the means to read the coolant temp directly with an obd or similar device.

Here's a link to a G1 thread on grill blocking. Long thread,but many many good ideas. Some of my very crude stuff for my red cvt is at pages 25, 27 & 28.

I've had success at regaining some of the lost mpg, but I've never regained it all, (not until warm weather returns).
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Last edited by Mountain driver; 12-04-2017 at 09:03 AM.
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Old 12-04-2017, 09:41 AM   #3 (permalink)
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I have experimented with grill blocks and removing the snorkel on the air intake on my G2 Insight.
Combined, it has to be said, with a digital in/outthermometer feeler in the intake (at first) and a readout from the intake temp on my UltraGauge (when I got that).

FWIW, blocking the lower grill is beneficial. It helps air intake temperature slightly without it getting out of hand, even in warm weather.There is enough free air through the upper grill to stay safe (but do monitor the intake temp!)

Blocking the top grill alone seems to have little effect. The bottom grill is just too big. The snorkel makes the intake draw air from over the radiator which generally came from the top grill, but with that blocked cold air just flows up from the lower grill.

Blocking both grills works fine in most conditions. The temperature raise is significant; as is the gain in efficiency, up to where it surpasses 30 degrees Celsius (92 F); from there on it stays level to over 50 C/122 F, where it gets detrimental.
Also, blocking the grills means the engine retains its heat longer when parked; distinctly noticeable to over 4 hours. The downside is that the 12V battery may be subjected to temperatures above 40 Celsius, and they don't like that.

Then I tried driving without the snorkel (which draws air from above the radiator) as a simple warm-air intake hack.
The intake then draws air from the radiator.
Without a grill block this does little, as only the top of the radiator gets hot.
With a grill block less air flows through the radiator, so more of it gets hot; also the part where from the air finds the intake, so that the AI temperature will quite suddenly rise.
Removing the snorkel therefore is not a very good idea. It only raises the intake temp when that is no longer necessary...
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Old 12-05-2017, 02:08 AM   #4 (permalink)
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Front use of foam polyethylene and fabric with cardboard.
The engine is covered with felt. The battery 12B is wrapped in foamed polyethylene with a layer of foil with ventilation for heating.
Normal start without starter at -15C. The engine warms up 5 minutes, the salon - 5 minutes. The start-stop is triggered even at a temperature of -18 C.

In Siberia it is necessary to warm the car well.
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Old 12-05-2017, 03:47 AM   #5 (permalink)
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Well, it's not Siberia here and "cold" is relative. We rarely experience freezing double-digit cold. But I can see a sharp increase in fuel consumption as soon as the temperature drops below 5 to 6 degrees centigrade. Above that threshold, I easily get 20+ km/l on the display, below that I am happy to get to 17 km/l. Or 5 l/100 km to 6 l/100 km respectively. I do not think, I need to completely wrap the engine, but I guess a bit of Coroplast cut to size will help maintaining good fuel economy...
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Old 12-05-2017, 12:54 PM   #6 (permalink)
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Dont forget that tire pressures drop with the cold as well.
Sorry im In Southern California and it will be 76 today and in the 80s tomorrow. (24-30c)
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Old 12-05-2017, 01:04 PM   #7 (permalink)
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Also remember that in cold weather the cold enrichment will stay on for a longer time. On a short trip the engine will never come up to operating temperature. If your area gets "winter gas" this will also reduce winter MPG.

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Old 12-05-2017, 03:13 PM   #8 (permalink)
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Quote:
Originally Posted by gms24ru View Post
Front use of foam polyethylene and fabric with cardboard.
The engine is covered with felt. The battery 12B is wrapped in foamed polyethylene with a layer of foil with ventilation for heating.
Normal start without starter at -15C. The engine warms up 5 minutes, the salon - 5 minutes. The start-stop is triggered even at a temperature of -18 C.

In Siberia it is necessary to warm the car well.
I like that fabric lower block!
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Old 12-06-2017, 04:09 AM   #9 (permalink)
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No winter gas here. Our met office issues "severe frost" warnings for -2
-2 Centigrade, not Fahrenheit, that is.
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Old 12-14-2017, 11:56 PM   #10 (permalink)
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I've been doing the same thing I listed in the Grill Blocking thread the last 8 years, it does improve mileage a bit. No point in blocking it all off there is really not much noticeable difference blocking the top off from my tests.

I did modify this setup to use a pool noodle with slice down long end to make a tighter fit and it improved the mileage a little bit more. Just watch your temps and remove the longer bar block in the summers / spring.

https://www.insightcentral.net/forums...tml#post154299
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