Gdi Pump Thoughts And Questions

[jdnet]

Ok guys,

Finally got around to disassembling the old and problematic GDI pump I had lying around. Anyway after stripping down the pump I did notice something. on the side of the pump there seems there is a torx screw which I believe actually adjusts the fuel flow. I was wondering if anyone could confirm that and if it does in fact adjust the flow would it help fix the low pressure problem with the pump? Also could there be a part of the adjuster that may be prone to premature wear?

Another thing I should note is that I did find a bit of sludge at the point the pump connect to the engine for lubrication. It seemms like it diid not have a problem with that aspect though.

[dude]

the people at Unit#d Mot#rs says that GDI isnt a "proven" technology and it has its engineering flaws

[The Don]

the people at Unit#d Mot#rs says that GDI isnt a "proven" technology and it has its engineering flaws

Mitsubishi was the first company to introduce this technology and mass market it. It's been developed further since then and has been used as the basis for common rail diesel technology as well.

Both suffer from the same issues though, and it's not really to do with the technology being proven, but the quality of fuel we get in SL. This is the reason we also don't get DCI common rail diesel engined vehicles imported to SL.

Just because something doesn't work in SL doesn't mean it's proven But I take your point.

Incidentally I tend not to take anything to come out of Unit#d Mot#rs seriously. With Car Mart they are possibly the worst dealership in the country.

[Sifaan]

Both suffer from the same issues though, and it's not really to do with the technology being proven, but the quality of fuel we get in SL. This is the reason we also don't get DCI common rail diesel engined vehicles imported to SL.

what's DCI? only reference I could find do it was Nissan's common rail technology..

aren't the e46 320d facelifted common rail engines doing fine with super diesel here?

[The Don]

what's DCI? only reference I could find do it was Nissan's common rail technology..

aren't the e46 320d facelifted common rail engines doing fine with super diesel here?

Yeah, it's actually a technology developed by Renault, and now used by Nissan since Nissan is owned by Renault. Quite successful but I think trial runs in SL have revealed that it struggles with our quality of fuel hence A*W do not import them to SL.

Not all common rail engines have this problem, because of slightly different approaches to fuel pump design, fuel filtration etc. Some seems to have done better than others in our context. But technologies are not developed with one environment in mind. The Toyota D4D, the Mercedes CDi and BMW s common rail diesels all seem to function ok in SL.

[toyota sucks]

Mitsubishi was the first company to introduce this technology and mass market it. It's been developed further since then and has been used as the basis for common rail diesel technology as well.

Both suffer from the same issues though, and it's not really to do with the technology being proven, but the quality of fuel we get in SL. This is the reason we also don't get DCI common rail diesel engined vehicles imported to SL.

Just because something doesn't work in SL doesn't mean it's proven But I take your point.

Incidentally I tend not to take anything to come out of Unit#d Mot#rs seriously. With Car Mart they are possibly the worst dealership in the country.

I've seen have that the Renault and some othr brands of prime movers imported to sri lanka dCi engines,

So will they have those problems?

And there are some diesel dCi x-trails imported here (by passing A*W) so will they also face a problem like the GDi pump

And also isn't peugeot 407 HDi s simillar to GDi And according to what i know they are running fine aren't they.

So I think it's a GDi isolated problem isn't it?

[Buddhika M H]

well in 1950s BOSCH & Mercedes Benz developed petrol direct injection for production cars (1955 300SL used this), so it got a history and cant said its not proven.

But in Mitsubishi's GDI system, I heard there are flaws/issues, like homogeneous and stratified modes change over point. Also many are saying its the quality of petrol in SL.

Btw many Benz cars coming here today got direct injection (CGI as Benz calls) and they seems to be doing good according to the agent giving good fuel economy (relatively) & no issues.

But getting back to the main topic of the thread, I'll try to find out any info on this JD, but I'm not a pro will have to get info from others

[TURBOMAN]

Ok guys,

Finally got around to disassembling the old and problematic GDI pump I had lying around. Anyway after stripping down the pump I did notice something. on the side of the pump there seems there is a torx screw which I believe actually adjusts the fuel flow. I was wondering if anyone could confirm that and if it does in fact adjust the flow would it help fix the low pressure problem with the pump? Also could there be a part of the adjuster that may be prone to premature wear?

Another thing I should note is that I did find a bit of sludge at the point the pump connect to the engine for lubrication. It seemms like it diid not have a problem with that aspect though.

Waiting for a rational answer

[virajkv]

If I post here for what i concern, may be im going out of the topic.. but after i saw the comments, i couldn't keep my mouth shut and want to ask this.. Is all the common rail direct injection engines must be used the super diesel? If not, and if only the normal diesel is used, then will it be a problem?

Pls guys i need some pro answers coz im about to buy one... :unsure: :unsure: :unsure:

[dude]

Mitsubishi was the first company to introduce this technology and mass market it. It's been developed further since then and has been used as the basis for common rail diesel technology as well.

Both suffer from the same issues though, and it's not really to do with the technology being proven, but the quality of fuel we get in SL. This is the reason we also don't get DCI common rail diesel engined vehicles imported to SL.

Just because something doesn't work in SL doesn't mean it's proven But I take your point.

Incidentally I tend not to take anything to come out of Unit#d Mot#rs seriously. With Car Mart they are possibly the worst dealership in the country.

yup car mart doesnt have spare parts customers have to wait for months

[The Don]

I've seen have that the Renault and some othr brands of prime movers imported to sri lanka dCi engines,

So will they have those problems?

And there are some diesel dCi x-trails imported here (by passing A*W) so will they also face a problem like the GDi pump

And also isn't peugeot 407 HDi s simillar to GDi And according to what i know they are running fine aren't they.

So I think it's a GDi isolated problem isn't it?

I made that comment on DCi based on the comment of a fellow forum member who said that A*W were not offering the DCi version of the X Trail due to fuel quality concerns for the permit. Since I'm basing it on somebody else's comment it might not be 100% accurate.

Well you have to put this so called GDi issue in perspective. Cars which arrive in SL from Japan have usually done quite a few miles, possibly closer to 100k than what the meter says. And in some the high pressure petrol pumps fail, and because of their sophisticated design they cost more to replace than standard fuel pumps. So if you look at it objectively the situation is not as bad as what some people make it out to be.

The real problem however was the fact that outside Japan it failed to deliver the type of fuel economy expected of the system, even in Europe. Now that if anything is what Mitsubishi had to improve on on the first generation GDi vehicles.

Both Petrol and Diesel direct injection technologies are now widely used. Different manufacturers use different names for it but its the same basic technology.

[The Don]

If I post here for what i concern, may be im going out of the topic.. but after i saw the comments, i couldn't keep my mouth shut and want to ask this.. Is all the common rail direct injection engines must be used the super diesel? If not, and if only the normal diesel is used, then will it be a problem?

Pls guys i need some pro answers coz im about to buy one... :unsure: :unsure: :unsure:

Best to check with the dealership in Sri Lanka. They would have tested the vehicles with both normal and super diesel available in the country before importing a particular model of vehicle to SL. Some vehicles are more tolerant to fuel impurities than others. But the point to note is super diesel isn't necessarily any cleaner than standard diesel. It depends very much on the manufacturer.

[Magnum]

Both suffer from the same issues though, and it's not really to do with the technology being proven, but the quality of fuel we get in SL.

i agree with you, the 2 Litre Allion/Premio has the same problem, there's a big difference in the fuel figures when its used in japan and in Sri Lanka