Paranoid About MPG -130 Remapped Owners

[maxcars1]

Ok guys first and formost I dont want to get this thread harping on about loads of mpg figures, but just some guidance. Over the past couple of days I've had my timing belt done and noticed that my mpg is quite low; or is it - a timing belt surely cant cause this

The car is used approx 4 times a month as I have a work horse for commuting My car is mapped and running approx 175-180bhp. Drove to work today which is a 25 mile run and after about 20 miles the fuel computer reached 48mpg average at a constant run of 75mph. Yesterday in town approx 31mpg was seen.

So all you 130 remapped owners should i be worried about these figures I'm sure i was getting around 50-60mpg before, but i will say that i've gone from a mapped 100pd to 130pd hardware and another remap hense why I highlight the issue to 130 owners. I'm staring to think MAF issues already, but need further guidance.

 

[Kam]

Before I had my car mapped, it used to return an average of 48mpg. After mapping, the mpg went up for a little while but now, it is about 46mpg.

A cam belt chage "could" affect the economy in the short run. I don't know how I find that little things such as tyres do.

 

[BlackFR]

My non remapped is churning out low mpg's at the moment. My cross country bash is showing 37mpg. Always goes lower than average this time of year!

 

[keefy]

An over-tight cam belt would reduce your mpg. If it is too tight, it can damage/snap the tensioner.
If you are concerned I would ring the garage, express your concern and get them to check the tension.

My Bro has a 1.6 Golf and the VW dealer over-tightened his replacement cambelt. A week later it broke the tensioner and he had to call out recovery. Luckily, it did no other damage (amazingly) and VW replaced it FOC.

 

[Kam]

If the belt is too tight, it is noisy. There will be a belt whirring noise, which goes up and down with the revs.

I had this when my belt was changed and the monkeys had over tightened it so much that the tensioner had snapped/broke.

 

[sssstew]

when changing the belt i think your supposed to check the timing with vag com or the like after the job is done, this could be the issue.

 

[maxcars1]

when changing the belt i think your supposed to check the timing with vag com or the like after the job is done, this could be the issue.

Can anyone check this to see if its defo say on Elsa Maybe worth asking just to make sure

 

[sssstew]

ive checked and it appears this is relevant for non PDs :-

http://www.ross-tech.com/vag-scope/TDIGraph.html

but doesnt specifically say that you do NOT need to check the timing for PDs after a change.

 

[maxcars1]

sssstew here why on the PD "Note to 1.9 PD (pumpe duese aka unit injectors) owners: You cannot nor do not need to set your timing electronically. There are no graphs published for the simple reason that the timing is set using a dedicated VAG locking tool when changing the timing belt"

Theres the answer

 

[Fez boy]

When mine was on the test drive for selling it was still showing 45+ mpg

 

[dasmith83]

thats wot happened to my mpg figures wen i got mapped m8. Sounds like normal to me...maybe its just my right foot tho

 

[Diablo559]

be glad i got 230 miles out of my last tank fill thats the worst figure i have had yet. by the way its a cupra remapped

 

[FR*Man1984]

my mpg has dropped, now getting around 350-400 miles per tank - 42mpg or there-abouts (according to the trip computer)

 

[maxcars1]

my mpg has dropped, now getting around 350-400 miles per tank - 42mpg or there-abouts (according to the trip computer)

Ummm maybe i havent got a problem then

 

[idge]

i think its the time of year, mines dropped a few mpg recently. I don't think the cold air and high winds help the engine much. Especially seen as i go over the pennines every day

 

[D-Power]

Its important to keep checking tyre pressures at this time of year as the temperature drops they'll often be down a few psi. Makes a considerable difference to mpg and handling IMO. Every little helps....

 

[dmjw01]

I don't think the cold air and high winds help the engine much.

On the contrary: Engines love cold air. (Except of course, for short journeys where the cold ambient temperature means it takes a long time for the engine itself to reach operating temperature.)

But in any case, we really aren't seeing cold air at the moment. It's ridiculously mild for this time of year - I'm seeing 12 to 13 degrees on the temperature gauge.

 

[justlivyalife]

On my journey to Uni this morning I only saw 51mpg. Before Christmas, I was seeing 56/57mpg as an average on the journey (at 70, motorway). This tells me the wind is affecting my MPG quite severely!!

 

[idge]

Ah but the cold(er) air is making the engine use more fuel cos the air is denser, so its quicker but thirstier.

i managed a 59mpg run earlier, but that was at 50mph all the way, grandad style

 

[dmjw01]

Ah but the cold(er) air is making the engine use more fuel cos the air is denser, so its quicker but thirstier.

It only uses more fuel if you put your foot down further on the "go" pedal. The volumetric efficiency of the engine is better with cold air. If you drive it at the same speed, it'll do better in cold air than hot air.