how to gain 7 mpg on a 15 year old 2.8l car

[GoNz0]

for the sum of £69 inc special delivery return to me i got all 6 injectors tested and cleaned, noticed an immediate 8mpg increase on the test run, car also idles better, accelerates a hell of a lot better and best of all more MPG

average b4 was 27mpg, now its 35

i was put onto jim via a guy on the bmwland forums who has built all his own kit over the years to do this.

Analysis.

All the injectors were pattern tested, flow tested, and driptested. Cleaned and re tested.



The test procedure involves running the injectors at a wideand varied range of rpm. To my knowledge, no one does this as standard.

Pattern test.

All the patterns were quite poor. All were wide, scattered, andpoorly atomized.

Flow test.

The flow test was quit poor as is evident in the pics.

Drip test.

None of the injectors dripped when under pressure without avalid signal.



The cleaning procedure involves forcing cleaning fluidthrough the injectors in both directions while they are in the ultrasoniccleaner. This has the advantage of cleaning out the filter baskets and flushingany debris from the spray nozzle. To my knowledge, no one else does this asstandard.

While they were in the cleaning tank, as the solution warmedup, one of the injectors stopped working. (no5) Over the next ten minutes or so asthe ultrasonic cleaner did its job, the injector settled down and workedconsistently.

Post clean.

The flow rates equalized on all the injectors and they nowdeliver the same volume within +or- 1.%. (This is very good)

The pattern irregularities that were observed beforecleaning have disappeared and all are now spraying correctly.

Conclusion.

Your injectors were in poor condition.

Now that they are spraying correctly and delivering the samevolume, I would expect smoother acceleration and better performance,

Excluding unforeseen injector failure, they should allperform well for the foreseeable future.

These are now a well balanced set.

New O rings have been fitted.

Pics attached.

If you have any questions, ill be happy to discus the above.

Don’t forget to put adrop of oil on the “O” rings to aid in assembly,

(THIS SI ESSENTIAL)

and don’t forget to reset the ECU. (Battery off for half anhour) If Aplicable.

Please confirm you receive the report.

Please let me know when you have got them back in andrunning, either by mail or on

the forum.

Regards Jim

[Tonka777]

Nice! Were there any more pics, and have you got a link for this guy please?

Thanks for the post.

[GoNz0]

he has no website, its a guy who has built up the kit due to demand. there were no more pics, you just get a b4 and after shot of the flow rates as i expect its a bitch to try and snap the spray patterns without really good light and a good camera. i have already ran a noise filter and sharpened those pics as they were quite poor due to the lack of natural light on a clear day.

if you google the phrase "Jim injector cleaning" and filter for the UK you will see lots of posts relating to the guy

if you want to email him its "s {dot} trap {at} ntlworld {dot} com"

just replace the bits in {} with a . or @

i sent them special delivery Monday, received, the above done and posted back out the following day, refitted this afternoon after a special delivery back

if you do email him let him know Gareth mentioned the service
3 days from posting to delivery is as fast as possible without taking them down and waiting for a few hours

[GoNz0]

this posts a bit better, kits been update since!

http://www.vpcuk.org/forums/showthre...ad.php?t=49683

[MadduckUK]

is this purely getting back to new condition or is there some "balancing" going on that could surpass stock specs?

[GoNz0]

no just a clean until every things balanced.

basically all these supermarket fuel additives take there toll, i guess even top of the line fuels still gum up the injectors to some extent.

the problems arise when your car has less than 1 O2 sensor per cylinder as it averages out the mixture.

my cars got 2 banks of 3 so one running high flow and 1 low flow buggers up the economy, better spray pattern makes sure the fuels atomized and igniting properly, amazing difference.

[kalniel]

Clean injectors are recognised to be vital for diesel - that's why the additives in premium diesels are basically cleaning agents (to the point where shell introduced them to their non-premium fuelsave brands too - dropping the diesel premium as a result).

[Guy]

(to the point where shell introduced them to their non-premium fuelsave brands too - dropping the diesel premium as a result).

Shell still do V-Power Diesel, well its still on sale round by me?

[kalniel]

Shell still do V-Power Diesel, well its still on sale round by me?

Oh, interesting. I can't find it anywhere around me anymore. What does it have that fuelsave doesn't?

[Guy]

Oh, interesting. I can't find it anywhere around me anymore. What does it have that fuelsave doesn't?

No idea tbh, I have wondered that myself a fair few times.

Some marketing waffle: http://www.shell.co.uk/home/content/...wer_pkg/about/

Taken from wiki: V-Power Diesel is Shell's version of an enhanced diesel fuel, similar, say to BPs 'Ultimate Diesel'. Like BP Ultimate Diesel, Shell V-Power Diesel is designed for modern compression-ignition diesel engines, to facilitate enhanced engine performance along with increased engine protection, for more consistent operation and engine longevity.[3]

V-Power Diesel is a blend of regular petroleum-based diesel and synthetic diesel, created using gas to liquids (GTL), along with some extra additives designed to clean the injection system and improve injection pump and injector lubricity.

One characteristic of V-Power diesel is that it is a lot clearer and odourless than normal diesel, mainly due to the synthetic GTL component.

The fuel is slightly less dense than regular diesel so, per volume, the unit energy is actually lower than regular diesel. This is offset, as the fuel tends to ignite more readily (and thus has a higher cetane rating) than regular diesel, and a side benefit of this is that it tends to produce less soot during combustion.

Anecdotal evidence shows that its performance varies depending on how an engine is set up. In most cases, it will make a rough-sounding engine run noticeably smoother, and can also alter the performance characteristics; typically some low-end torque is lost, but performance in the middle of the rev range and above is increased. In some engines however, particularly well-tuned common rail turbodiesels, very little effect can be seen or felt.

[kalniel]

Yeah the wiki article seems to be pulled out of nowhere pleasant, the marketing simply says:

"Shell FuelSave is designed to help improve fuel economy by reducing energy loss. It helps prevent the build-up of deposits in the engine, leaving more of your fuel’s energy to power the wheels, providing you with improved fuel efficiency."

"Shell V-Power Diesel is designed to remove existing deposits to help restore and maintain performance so that your engine can operate at its best."

So I'd guess V-Power simply has a higher concentration of detergent. Redex is cheaper

[DanceswithUnix]

I'm not claiming snake oil here as I am sure dirty injectors won't help, but many people find that just an ECU reset can give them a huge boost to economy and performance. The balance will ofc help, but then that is part of what you pay the extra for with V-power

AFAIK on an old car like my Alfa (11 yrs old but engine design is older) the spray pattern is irrelevant. The injectors are bulk fired into the inlet manifold, so all 6 injectors always fire at the same time at the start of a cycle regardless of whether the valves are open or closed. At wide open throttle the injectors are pretty much dumping all the time and the petrol kind of ends up as a puddle on top of the inlet valve.

The wife's car has a more modern version of the engine where it has sequential injection, so it actually cares whether the valve is open or not. That helps emissions and mpg, but not as much as the 6 speed gearbox vs my 5 speed one from the figures I have seen.

I imagine in a direct inject petrol engine it matters more.

[kalniel]

I'm not claiming snake oil here as I am sure dirty injectors won't help, but many people find that just an ECU reset can give them a huge boost to economy and performance.

Now that's something I've not heard before. Why would an ECU require resetting?

[Guy]

I know on most automatics, resetting the ecu caused the gearbox to go back to factory defaults, and relearn your driving style. So theoretically adapting to your driving style giving you slightly better mpg.

Certainly the case on my E90, and the Japs have been doing it for years. The old Galant VR4's were the same.

[DanceswithUnix]

Now that's something I've not heard before. Why would an ECU require resetting?

Modern ECUs copy mapping tables into ram. As you drive they learn the engine characteristics as set by your driving style and petrol used, and modify their map to suit. Remove the battery for a while and those tables are reset forcing the system to re-learn.

Drive like an old granny, and the car learns that and optimises for it. Replace a sensor or clean the muck out of the throttle body, the old maps will no longer be right.

Problem is, even if you buy the same petrol from the same garage all the time the mix will change every 6 months which eventually invalidates the learned map.

This is why saying to reset the ECU after cleaning the injectors is utterly sensible, as without it you would probably see little advantage out of the cleaned injectors. However, just a reset on its own will often help.

[[GSV]Trig]

Depends on the ECU type, mine for instance has an air flow meter and a lambda sensor so it knows how much air is going in and how much unburnt fuel is coming out of the back.
As you drive the car it has a set of tables that it works from for a few minutes until the car is warm, then it essentially live maps itself using data from the AFM and Lambda, when its done it writes those details to the standing tables, and uses them when you start again.
As fuel type changes and things like pump/filter/injectors etc start to die off the ECU compensates.
So, if you get your injectors cleaned they should in theory be performing as they were when the car left the factory, so, you reset the ECU to the same state meaning the ECU has less learning to do.