20mpg on TDI

jcc-gttdi150

www.torqueoftyneside.co.u
A remap will always make the consumption worse.

Nope. My last Golf 150PD was managing 53mpg after a ********* fast road remap (195bhp, 395Nm).

If you thrash it, yes the mpg will be worse, but under normal driving conditions it should be improved, as I and numerous others will testify. I have their economy map too which boosted power to 180bhp or so and promised much improved mpg, but............... I never bothered using it lol

As for the poor mpg, I'd check:

maf, egr and manifold, boost leak somewhere?, tyre pressures, air filter clean?, fuel filter replace?, service?. Could be the vanes on the turbo sticking in one position instead of being variable due to crud, if your car has it (Can't even remember wot car it was now)

vagcom would be a huge help if you have it too to save buying/ replacing parts needlessly
 
Last edited:

MJ

Active Member
Apr 22, 2008
5,619
54
Manchester
alhambras have a tendancy to get blocked up with carbon deposits inside the turbos, this can cause erratic turbo behavior. As for fitting a new MAF - good idea as they should always be replaced when a remap is carried out for optimum performance BUT cleaning the old one or cleaning any MAF will not make a difference, the hot wires inside the housing are far too delicate to remove all the deposits or baked on crap from the intake system.
If no fault code shows then the problem is more than likely to be mechanical - then again theres no such thing as a flawless remap file.
 

gti gadge

Guest
Nope. My last Golf 150PD was managing 53mpg after a ********* fast road remap (195bhp, 395Nm).

If you thrash it, yes the mpg will be worse, but under normal driving conditions it should be improved, as I and numerous others will testify. I have their economy map too which boosted power to 180bhp or so and promised much improved mpg, but............... I never bothered using it lol

As for the poor mpg, I'd check:

maf, egr and manifold, boost leak somewhere?, tyre pressures, air filter clean?, fuel filter replace?, service?. Could be the vanes on the turbo sticking in one position instead of being variable due to crud, if your car has it (Can't even remember wot car it was now)

vagcom would be a huge help if you have it too to save buying/ replacing parts needlessly

Most common problem is as stated above with the vanes sticking. Strip the turbo out and clean it. Just been reading a good thread on the UKMKiv's forum:whistle:
 

Big_daddy

Going going gone.....
Oct 20, 2006
3,930
0
Brummy
Update,

Ive noticed abit of oil (tiny bit) on the same place,

Ive did what another member, was to block of the vacum line that controls the egr valve. I did this. Ive notiiced improvemnts straight away, on a cold engine the mpg computer rise to 29mpg, Once fully warm, the mpg showed around 37mpg+ on 30-40 cruise.
The hesitation in lower gear had 98% gone. The car does feel abit less torquey but it could me.

Is it safe to leave the egr valce vacum line blcoked off? Will it trigger the engine/glow plug light on the dash.
 

Muttley

Catch that diesel!
Mar 17, 2006
4,987
31
North Kent
It is safe to leave the vacuum line blocked off, provided there is no chance of the blocking item getting sucked into the vacuum system. The usual way round this is to put a nail or golf tee into the pipe.

What you are doing is disabling the EGR system which will increase the NOx emissions of your engine but decrease the CO, CO2 and soot. NOx is not an MOT requirement.

You may get a CEL, the PD engine seems to have more checking around the EGR than my TDI 110. I believe the tested way of defeating the EGR with no CEL is to insert a plate in the EGR-to-inlet manifold joint that has a small hole in it.

You don't want to run with a CEL constantly on, in case something goes wrong with the engine - you want the CEL to light up only when there's a problem.
 

Big_daddy

Going going gone.....
Oct 20, 2006
3,930
0
Brummy
It is safe to leave the vacuum line blocked off, provided there is no chance of the blocking item getting sucked into the vacuum system. The usual way round this is to put a nail or golf tee into the pipe.

What you are doing is disabling the EGR system which will increase the NOx emissions of your engine but decrease the CO, CO2 and soot. NOx is not an MOT requirement.

You may get a CEL, the PD engine seems to have more checking around the EGR than my TDI 110. I believe the tested way of defeating the EGR with no CEL is to insert a plate in the EGR-to-inlet manifold joint that has a small hole in it.

You don't want to run with a CEL constantly on, in case something goes wrong with the engine - you want the CEL to light up only when there's a problem.

Stuck a laptop Dc adaptor in there. lol :D fiited nicley plus i dont want stick nails as if it fall sout it may get stuck in my new tyres

If the light does come on and is related to the car egr valve, then i may consider it?
but will the blanking plate cause the car to jerk? like it did before? Think my egr valve i knckered casuing it.
 
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