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Old 11-16-2010, 07:19 PM   #11 (permalink)
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I see more data for the wiki coming

Long time without adding data, I am hungry for new data!

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Old 11-16-2010, 07:20 PM   #12 (permalink)
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Have you guys considered modifying the Coolant temp sensor with a resistor to reduce 'Cold-start fuel enrichment'?

I doubt you could get away with what I did, by skewing it so much that fuel-enrichment is non-existent, and gaining 7% overall but I'm sure you could still enjoy 'Fuel-enrichment' smoothness by adding 60F to the minimum temp you see.

I picked 60F assuming you get 0F, which means it will think its 15deg Celsius and therefore still apply enough enrichment.

The resistor in parallel works best if the Coolant temp sensor resistance drops with increasing temperature, so that even though you have altered the value at low temperatures by a lot, it only changes it by a little at the operating temperature.

I can throw up a spreadsheet if people want to have a looksie and modify it for their own use.

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Old 11-16-2010, 07:53 PM   #13 (permalink)
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I just did this over the weekend, with a 100k stereo potentiometer mounted in the dash. All the way left (low-volume...) is essentially stock, and about 1/3 of the range gets me as lean as I want to go for now.

Next up is a heated O2 sensor, I noticed my car going into closed-loop mode very quickly, but the idle was bouncing all over the place.

I really like having more control over the warmup enrichment!
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Old 11-16-2010, 10:13 PM   #14 (permalink)
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In my Yaris I have a warm air intake and upper grill blocker and at -5C ambient air temperatue it gets to 55C coolant temperature in less than 2km at speed of less than 70km/hr. this takes less than 3 minutes. it takes an other 5 too 10 minutes to get to 85C operating temperature.
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Old 12-17-2010, 11:55 AM   #15 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
I'm betting your engine warms up faster. Based on nothing
Quote:
Originally Posted by Daox View Post
I bet its slower, based on it being diesel.
And the winner is... Daox!!

Now the next question is: When does my 1.6 liter turbodiesel get up to operating temperature?

The find out the answer you'll have to read on :evil_smirk:

So today I found some time to do the idling test. When I started at noon it was sunny and a toasty -12C (10F) outside. Starting the cold soaked engine wasn't easy, especially when the battery is 5.5 years old and the glow plugs are acting up.

As mentioned earlier, I took notes every 30 seconds, writing down the intake air temperature, water temperature, fuel consumption and total fuel used. After the first few minutes I knew I was going to spend more time on this than 17 minutes. In fact, I spent more than twice that (35 minutes), and my coolant just barely got to 66C (151F). My normal operating temperature is 78C (172F). I wasted almost half a liter of diesel fuel. I could have kept it going indefinitely and the thermostat probably wouldn't open until April (starts to open around 83C/181F).

The experinment was done without my temporary thermal insulation, and with everything switch off. Here is the data:

time
(minutes)
Intake air
temperature
(C)
Water
temperature
(C)
Fuel consumption
(liters per hour)
Total fuel used
(liters, diesel)
0-12-121.200.00
0.5-11-100.940.00
1-11-70.950.01
1.5-11-40.960.02
2-1101.050.03
2.5-1031.040.04
3-1061.020.05
3.5-1090.930.05
4-10110.910.06
4.5-9131.050.07
5-9141.020.08
5.5-9161.020.09
6-8180.980.10
6.5-8200.990.10
7-8210.960.11
7.5-7230.970.12
8-7241.000.13
8.5-7260.970.14
9-6270.940.14
9.5-6280.950.15
10-6290.780.16
10.5-5310.800.17
11-5320.800.17
11.5-4330.780.18
12-4340.780.19
12.5-4350.770.19
13-3360.750.20
13.5-3370.760.21
14-3380.760.21
14.5-2390.750.22
15-2400.750.22
15.5-1410.720.23
16-1420.730.24
16.5-1420.730.24
170430.730.25
17.50440.740.25
180450.740.26
18.51460.720.27
191460.700.27
19.52470.700.28
202480.690.28
20.52490.690.29
213490.690.30
21.53500.670.30
223510.670.31
22.54520.670.31
234520.670.32
23.55530.660.32
245540.660.33
24.55540.650.33
256550.640.34
25.56560.650.35
267560.680.35
26.57570.680.36
277570.660.36
27.58580.660.37
288580.680.37
28.58590.680.38
299590.680.38
29.59600.670.39
309600.670.40
30.510610.670.40
3110610.660.41
31.511620.650.41
3211630.650.42
32.511630.650.42
3311640.640.43
33.512640.630.43
3412650.630.44
34.512650.620.44
3513660.620.45



After the test was finished I turned the heat and blower on and set them to max, and the coolant temperature instantly dropped 10 degrees to 55C (131F). I then drove 2km to the vet (with the heat on) and the coolant temperature never rose above 55C.

Now that I have data from both this and the coolant heater experiment I'll crunch some numbers and see how to use the heater most efficiently.
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Old 12-17-2010, 12:39 PM   #16 (permalink)
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Quote:
Originally Posted by abently View Post
Have you guys considered modifying the Coolant temp sensor with a resistor to reduce 'Cold-start fuel enrichment'?

I can throw up a spreadsheet if people want to have a looksie and modify it for their own use.

I would be interested in this idea... maybe a new thread? It would be a good place for mods like that and some info about open vs closed loop.
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Old 12-17-2010, 02:57 PM   #17 (permalink)
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Quote:
Originally Posted by Piwoslaw View Post
And the winner is... Daox!!
In my defense! I wasn't sure what would win the tug-of-war between the 993cc Suzuki and your 1.6D: the advantage of diesel efficiency, or the penalty of the larger engine.

Now we know!

Quote:
I could have kept it going indefinitely and the thermostat probably wouldn't open until April
Thanks for the laugh!
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Old 12-17-2010, 03:39 PM   #18 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
In my defense! I wasn't sure what would win the tug-of-war between the 993cc Suzuki and your 1.6D: the advantage of diesel efficiency, or the penalty of the larger engine.

Now we know!
Actually, I personally thought my time would be closer to your's. I doubted it would be less than 20 minutes, but I had no idea that after over half an hour it wouldn't even get near operating temperature. Yes, it was 5 degrees C colder than in your test, but after 17 minutes your engine was 98C over abmient, while mine was only 55C over

Diesel efficiency or not, this tank ain't gonna break no records All in the name of science, they say...

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ecomodding: the art of turning vehicles into what they should be

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Piwoslaw's Peugeot 307sw modding thread

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