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Old 14th April 2017, 15:16   #706
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Default Re: ARTICLE: How to get the maximum Fuel Efficiency

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Originally Posted by nilpat View Post
Lots of interesting articles floating around. I will give a try to Italian Tune up thing for my Figo 1.5 TDCi

I have small tip for city driving with mediocre traffic.
Don't drive sedate unless you are tired instead accelerate a bit and change your gears frequently to match the speed. Obviously you need to overtake vehicles quickly in this process; you will see increase in FE at least by 2-3. This works best for me.
I have observed the same thing in my WagonR. Change the gears to keep the engine between 2-4k rpms and the FE remains consistently good. It's a different story in open roads, where cruising rpms of upto 3k rpms gives the best FE.
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Old 25th September 2017, 15:17   #707
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Default Re: ARTICLE: How to get the maximum Fuel Efficiency

Hi guys,

I am back to discuss an old and unsolved issue in my Punto Diesel 90HP.
Earlier I had posted on how I had an issue of reduced pickup, black exhaust smoke and reduced mileage in the car. After a lot of running around I found the rubber turbo pipe to have broken. This caused the black smoke and also damaged the glow plugs. After replacing the glow plugs (in warranty) and the turbo pipe, the pickup and mileage issue was fixed. But unfortunately the low mileage issue still remains.

Recently I again had a glow plug and black smoke issue. I told KHT to straight away check the turbo pipe. Bang on! Set me back by ~3.5K but smoke and glow plug warning light is gone!

So now with the mileage issue -
I used to consistently get 14-14.5 in city and 17+ on highways (@ 130+ kmph) first 3 yrs of the car. I replaced my clutch @60000 and since then I have had this issue.
After the replacement I get 10-11 in the city. Highway mileage is great though. If I'm driving 80-100 I can expect 18-19+ and 100-120 I get 16-17.

So the issue is not with fuel quality or fuel station but definitely with city driving - that's when I am using the clutch all the time. But no clue whats the problem here - or even whether it is related to the clutch. Did the fiat guys mess up while replacing the clutch last time?? Did they use faulty components?? Is there a clutch cylinder leakage??
Or is it the fuel pump?? Do fuel pumps work differently in city and while on highway??

Whenever I talk to fiat, they take me for a test drive and set the display to Ic (instant cons.) which shows good readings and tell me all is fine. Only I know that the Ac (average cons.) which used to show 14-14.5 over a good 500 KMs now shows 10-11 with city usage. Service guys have totally blamed this on my driving technique!

I somehow made peace with this issue for almost 2 yrs now but now I am closer to replacing the clutch for the second time. And this time I want to get it right.
I really want to hear from any one who has faced an issue of reduced mileage right after getting the clutch replaced.
Also this time I plan to go in for a better after market clutch kit. Reviews tell me Luk is the best option I have so I am planning to go for it! (not sure what make Fiat uses.)

Any pointers anyone!? do help..

Last edited by sachinkudva : 25th September 2017 at 15:21. Reason: add extra information
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Old 25th September 2017, 17:23   #708
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In all honesty, I would be very surprised if a clutch, any clutch, can make such a difference in fuel efficiency. Your figures suggest almost 1/3 drop. I'm not sure what other members get as average fuel consumption? Always difficult to compare but still might give some clue. A substantial drop in FE is usually related to something amiss in the fuel system, e.g. Fuel Filter injectors, air inlet filter, or some leakages as you found out. Any error codes showing on an OBD reading?

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Old 25th September 2017, 18:49   #709
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Default Re: ARTICLE: How to get the maximum Fuel Efficiency

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I'm not sure what other members get as average fuel consumption?
Jeroen
Well, to be honest I am only comparing to my own FE before the major Punto 60K service. Also, its not that I blindly follow the Ac reading in my cluster display. I have been one of those OCD cases who resets the trip meter each time the reserve fuel warning lights up - to manually check if my mileage is consistent. And that's why I made a big deal of this issue to Fiat!

Now what beats me is that I get good (as good as before) mileage on the highway and the drop is only in city driving. And I believe any issue with the Fuel injection system would affect my highway mileage as well, right? All that I can think of as different, is the clutch usage - unless I am wrong!

Also, to list down all that Fiat does for the major 60K service apart from the oils and filters (verified from the e-bill) - gear cable replacement, clutch kit replacement, timing chain replacement.

As far as OBD goes, haven't confirmed myself as customers are not allowed inside the service centers. But SA always maintained that all readings are normal.

I also read today that bad transmission oil can cause a drop in mileage. But the bill shows that transmission oil was replaced as well. Now whether this was done, done right, done with the right oil, done with right amount of oil I don't know. But 3-4 Kmpl drop?? That's very strange.
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Old 25th September 2017, 20:47   #710
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Default Re: ARTICLE: How to get the maximum Fuel Efficiency

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Originally Posted by sachinkudva View Post
Well, to be honest I am only comparing to my own FE before the major Punto 60K service. Also, its not that I blindly follow the Ac reading in my cluster display. I have been one of those OCD cases who resets the trip meter each time the reserve fuel warning lights up - to manually check if my mileage is consistent. And that's why I made a big deal of this issue to Fiat!

Now what beats me is that I get good (as good as before) mileage on the highway and the drop is only in city driving. And I believe any issue with the Fuel injection system would affect my highway mileage as well, right? All that I can think of as different, is the clutch usage - unless I am wrong!

I also read today that bad transmission oil can cause a drop in mileage. But the bill shows that transmission oil was replaced as well. Now whether this was done, done right, done with the right oil, done with right amount of oil I don't know. But 3-4 Kmpl drop?? That's very strange.
I would think you would find yourself in very good company here on TeamBHP in terms of fellow OCD-s who all reset their trip meters every time. I know I do.

Still, it's very normal to have a substantial difference between city and highway driving. 30-40% would not be unusual for most cars I would think. I see similar on my various cars.

Even so, your averages appear to have started deviating from what you were used to after the clutch repair.

A few things can wrong with a clutch repair. The clutch could be slipping, the transmission might not be fully alligned with the engine, the bearing might have some problems etc. It would be very difficult to imagine that would give a big change in FE. Also to your point it would be across all of your usueage. And, the list of issues I just mentioned would show up with different symptons and are likely to get worse very quickly too. Clutches that slip wont lasst long, bearings that havent been installed properly wear out very quickly, lots of noise etc.

Transmission oil can influence you FE by a few percentage points, but again typically across the range of driving conditions.

It's difficult to think of anything that would effect city driving FE and not highway driving. The one I can think off, long shot, is tyre pressure. If your pressure is way too low, that will effect city driving FE. More resistance. But at highway driving a low pressure is likely to be less as it usually means the tire temperature increases quite a bit. Again, a bit of a long shot.

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Old 26th September 2017, 10:50   #711
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Default Re: ARTICLE: How to get the maximum Fuel Efficiency

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And, the list of issues I just mentioned would show up with different symptons and are likely to get worse very quickly too. Clutches that slip wont lasst long, bearings that havent been installed properly wear out very quickly, lots of noise etc.
Jeroen
I'm glad you mentioned this. With my stock clutch I managed 60K. But now, less than 45K later, I am really having a tough time changing gears in heavy traffic. So obviously this kit hasn't lasted too long. I'd like to think 45K is quite a poor life for a clutch kit! I guess I read in the Punto manual that the car is made for 1 million gear changes or something!
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Old 26th September 2017, 12:54   #712
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So obviously this kit hasn't lasted too long. I'd like to think 45K is quite a poor life for a clutch kit! I guess I read in the Punto manual that the car is made for 1 million gear changes or something!

Hah, that's an interesting one: how many gear changes would you get in 45k of driving. Obviously depends a bit on city versus high way driving. But I wouldn't be surprised if it is very high for most Indian cities because of traffic conditions.

I don't think I have ever had a problem with a clutch or replaced any part on any of my cars with less than 150K! But that's in Western Europe / USA.

My wife is from the West Indies, Barbados and that is very dense city/commute traffic these days. So endless shifting. And there I see the same thing, 60K appears to be not unusual.

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