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Old 14th July 2009, 11:29   #1
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Default OHC Fuel Economy Issues

Dear All,

I bought a used OHC 2003 1.3 DX couple of months back from my friend. I was getting around 13 KMPL FE in city. Last week, I went on long drive for 850 kms on nice roads . Surprisingly, I got only 14.7 as FE with A/C for the entire trip (calculated FULL TANK TO FULL TANK).
Can I do something to get better numbers. Here is some information about the car.

Tyres: relatively new. around 10k done. (Michelin 175/70 r13 82H)
Wheels: Stock
Fuel: HP Unleaded ( filled at Club HP stations Kukatpally Hyd, Vijayawada).
Engine Oil: Mobil Semi-synthetic 20w-50
Tyre Pressure : 30 PSI (recommended 29 psi)
Load: 3 passengers with minimal luggage.
Service done: a month ago at authorized dealer in hyderabad.

Your inputs and suggestions are highly appreciated.

Thanks,
Raghu Lakshman
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Old 17th July 2009, 09:07   #2
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Guys,

Where are OHC fans? I guess your suggestions would definitely help me resolve the problem if any. Please respond.

Thanks,
Raghu Lakshman
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Old 17th July 2009, 09:29   #3
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Is 14.7 bad for a 1300 cc car ? Fuel economy may get better if it is driven steadly for 100 to 110 kmph for extended periods, but were the road conditions good enough to provide this cruise control type driving ? In the monsoons with traffic and frequent gear changes this will be described as rather good for a 1300 cc 4 cyl car that is getting old.
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Old 17th July 2009, 10:35   #4
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I think, 14.7 KMPL with A/C on on long drive is quite good.
my new ANHC gave similar performance last month.

but to improve the fuel economy you can drive as below

1. drive at consistant speeds, do not engage in racing
2. drive at optimum speeds of 80-100KMPH as constantly as possible
3. do not ride on clutch while tailgating prior to overtaking
4. put A/c on optimum level, do not blast A/C when not needed.
5. ensure that the tyres have right pressures, under/over pressured tyres will affect the fuel economy
6. travel with optimum luggage, do not carry un-necessary stuff as it will load the car and would affect fuel economy
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Old 17th July 2009, 10:58   #5
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13kmpl in city for an OHC is good mileage. check the following link http://www.team-bhp.com/forum/techni...x-speed-1.html

Last edited by sushrutha : 17th July 2009 at 10:59.
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Old 17th July 2009, 11:02   #6
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13 in city is excellent fuel guzzling statistic by OHC.
and 14.7 for the same engine on highway is not exactly that great figure.

Seems like there is either some discrepancy in your calculations, or in the fuel.
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Old 17th July 2009, 12:37   #7
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dude - u need to be happy with this figure. i dont think any one can give u tips to better that. of couse i have heard figures like "13-15KMPL WITH FULL A/C ON IN BUMPER TO BUMPER CITY TRAFFIC FROM A 1.5 EXI " from some members but i take that with a bucket load of salt.

i, for one, believe ur city figures are quite good. so dont expect highway figures to jump up in proportion to that. ( alpha1 - dont extrapolate city figures to highway numbers - becos
1) u dont know the type of city traffic he is driving under
2) u cant just do a multiplier to city FE to get highway FE. there is ONLY AS MUCH a car can do no matter how empty the roads are )

just for the sake of recommeding something, i may ask u to check whether the air filter is cleaned. nothing more u cud do

Last edited by narayan : 17th July 2009 at 12:39.
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Old 17th July 2009, 12:51   #8
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14.7 on the highway for any OHC is low (let alone the 1.3).

What was your driving style like?

Most people think that staying in the highest gear gives the best FE. The fact is, you should choose your gears in such a way that it allows the car to acc smoothly with 25% throttle.

So if you're on a incline, going full throttle in 5th, you'd be wasting way more fuel than if you were doing it in 2nd@25% throttle.

I rem my cousin driving like this in his Wagon R on our way to Pune. When we claculated, the FE for the 400 or so km drive on an expressway was just 13kmpl.

Shan2nu

Last edited by Shan2nu : 17th July 2009 at 12:52.
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Old 17th July 2009, 19:34   #9
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Quote:
Originally Posted by Shan2nu View Post
14.7 on the highway for any OHC is low (let alone the 1.3).
what in ur view is a optimum mileage for a 1.5/1.3/vtec in stock condition with the driving stye you mention ?
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Old 18th July 2009, 19:59   #10
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Quote:
what in ur view is a optimum mileage for a 1.5/1.3/vtec in stock condition with the driving stye you mention ?
The average highway economy is around 16-17kmpl on my OHC VTEC, the max that iv achieved is 21kmpl.

The trick is not in staying in the highest gear possible, but choosing the right gear depending on load and vehicle speed.

Shan2nu

Last edited by Shan2nu : 18th July 2009 at 20:01.
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Old 19th July 2009, 09:00   #11
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Mostly when not on hilly roads, all gear changes should be done at around 2-2.5K rpm. This helps as there is no unnecessary high revving and the engine stays in good range. But this is applicable only for sedate driving. If quick and fast driving is required, extend that range so that the engine does not get strained.

Quote:
Originally Posted by StarVegabond View Post
4. put A/c on optimum level, do not blast A/C when not needed.
How will this help ? I think its the blower speed that you are talking about. As soon as you switch ON the Ac, compressor will be in use eating a bit of engine power. Now the speed you are talking about is of blower and not compressor not eating engine power or not.

14.7 is low for 1.3 G1HC. I have seen 1.5 deliver this on highway with full load + AC + 120-125 kmph driving.
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Old 19th July 2009, 13:27   #12
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Quote:
StarVegabond : 4. put A/c on optimum level, do not blast A/C when not needed.
@Raghu, I think you have got good tips & suggestions here. But a/c engaged once engaged is engaged, irrespective of the blower speed / cooling level selected.
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Old 20th July 2009, 09:23   #13
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Dear All,

Thanks a ton for all your suggestions, sharing your experiences and numbers. The last time I was on long drive (around 1900 KM from Hyd to Coorg) I got around 16.5 KMPL on my WagonR which considered to be excellent as per the service managers. So I dont think my driving habit would have major influence on my numbers.

Are there suggestions from the technical point of view which I can ask Service guys to look into? Yesterday there was an healthy argument between myself and the service manager on these numbers. To have some ammunition from my end, I need some points which I can put forward to him so that he can work on them.

If still I am not convinced with his recommendations or explanations, I would have to change the service center.

Thanks,
Raghu Lakshman
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Old 20th July 2009, 12:35   #14
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Almost 15kmpl is a good FE figure for a honda city 1.3.
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Old 20th July 2009, 13:26   #15
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Quote:
Originally Posted by nitrous View Post
Almost 15kmpl is a good FE figure for a honda city 1.3.
NOT AT ALL. going by some figures quoted here. i have done this 25% throttle thing many many times to check what best i get. havent found any dramatic difference.

with 195 profile tyres+ FFE and if i drive very sedately ( like supreme baleno ) - i get 8kmpl in Chennai traffic and used to get 10kmpl in gurgaon and max 12.5kmpl in highway in my 1.5EXI

there must be something fundamentally wrong with my car if the figures quoted above are possible
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