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 sdi injectors 
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 Post subject: sdi injectors
PostPosted: Tue Sep 12, 2017 2:02 pm 
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i have had sdi injectors in my rover 45 for 3 or 4 years now but its just failed the mot for the first time on black smoke.i did all the std stuff like air filter and injector cleaner etc but no good...so i put the origional std injectors back in and the smoke has cleared.
today i took the sdi injectors to my local derv man and he tested them and said they didnt seem to be too bad?he also said that they were cracking at 210 not the 200 they should be so hes going the strip them and clean them and reset them to 200.he says manufacturers often set the pressures high to allow for wear and tear as they get older so how many people have bought 200 bar sdis that are actually 210s??

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 Post subject: Re: sdi injectors
PostPosted: Tue Sep 12, 2017 2:55 pm 
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whats wrong with black smoke then?

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 Post subject: Re: sdi injectors
PostPosted: Tue Sep 12, 2017 4:05 pm 
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A visual plus an instrumented smoke test have now been introduced as part of the MOT Test for diesel cars. I think quite a lot of diesel owners who go by the mantra of "more smoke, more poke" are going to find problems at MOT test time from now on.

Whilst some people have the erroneous impression that lots of black smoke = more power, what black smoke actually indicates is incomplete/inefficient combustion - whilst the SDI injectors fitted to the later L series will give more power, they will also be liable to inject more fuel than the engine will cope with, hence the black smoke.


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 Post subject: Re: sdi injectors
PostPosted: Tue Sep 12, 2017 4:16 pm 
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my old 306 d turbo used to throw out chimney style amounts of soot :lol: :lol: :lol:

They used to back off then :lol:

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 Post subject: Re: sdi injectors
PostPosted: Tue Sep 12, 2017 4:24 pm 
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the mot tester said im not putting that on my machine it will blow it up...lol
the car has passed 3 mots but this time its started to smoke much worse than before.

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 Post subject: Re: sdi injectors
PostPosted: Tue Sep 12, 2017 8:19 pm 
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Turn the boost up?!


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 Post subject: Re: sdi injectors
PostPosted: Wed Sep 13, 2017 2:13 am 
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its running 19,dont want to push it too much?

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 Post subject: Re: sdi injectors
PostPosted: Wed Sep 13, 2017 2:20 am 
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my origional post was more a question about 200 bar injectors which were used when i bought them
4 years ago are doing 210 now? do manufacturers set them high as new to allow for wear? are we being cheated of performance when fitting sdis that are built with higher than stated pressure?

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 Post subject: Re: sdi injectors
PostPosted: Wed Sep 13, 2017 11:29 am 
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Had it been mapped to 150bhp? As that usually helps sort the black smoke out also. Sadly I don't know out about the pressure of the injectors.

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 Post subject: Re: sdi injectors
PostPosted: Wed Sep 13, 2017 1:25 pm 
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the whole point of fitting sdi injectors is they crack at 200 bar rather than the std injectors 210 bar giving more fuel...my sdis are cracking at 210?despite 4 years use and used when i got them.
get them back monday overhauled and reset to 200,see what it goes like then?

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 Post subject: Re: sdi injectors
PostPosted: Wed Sep 13, 2017 1:27 pm 
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it just passed the mot now so i can put the sdis back in for 12 months at least.

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 Post subject: Re: sdi injectors
PostPosted: Sun Sep 17, 2017 10:10 pm 
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xamtex wrote:
my origional post was more a question about 200 bar injectors which were used when i bought them
4 years ago are doing 210 now? do manufacturers set them high as new to allow for wear? are we being cheated of performance when fitting sdis that are built with higher than stated pressure?


No the manufacturers set them to spec - but they do drop with wear thats normal.

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 Post subject: Re: sdi injectors
PostPosted: Sun Sep 17, 2017 10:12 pm 
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xamtex wrote:
the whole point of fitting sdi injectors is they crack at 200 bar rather than the std injectors 210 bar giving more fuel...my sdis are cracking at 210?despite 4 years use and used when i got them.
get them back monday overhauled and reset to 200,see what it goes like then?


No the point is that they flow more fuel. The initial break pressure has very little to do with how much fuel they flow.
In simple terms they have larger holes in them so more fuel comes out once the injector is opened. For a 25/45 etc the opening pressure should be 210bar. 200 will be quieter but it depends on how it is mapped (if not standard).

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 Post subject: Re: sdi injectors
PostPosted: Sun Sep 17, 2017 10:13 pm 
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xamtex wrote:
it just passed the mot now so i can put the sdis back in for 12 months at least.

The MOT has had a smoke test in it for at least 10 years.

If smoke has suddenly increased I'd be looking for boost hose leaks/splits as they are very common and will give a lot of excess smoke on a 25/45 etc.

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 Post subject: Re: sdi injectors
PostPosted: Mon Sep 18, 2017 12:15 pm 
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E_T_V wrote:
xamtex wrote:
the whole point of fitting sdi injectors is they crack at 200 bar rather than the std injectors 210 bar giving more fuel...my sdis are cracking at 210?despite 4 years use and used when i got them.
get them back monday overhauled and reset to 200,see what it goes like then?


No the point is that they flow more fuel. The initial break pressure has very little to do with how much fuel they flow.
In simple terms they have larger holes in them so more fuel comes out once the injector is opened. For a 25/45 etc the opening pressure should be 210bar. 200 will be quieter but it depends on how it is mapped (if not standard).


so have i gone wrong having the 200 bar injectors that were cracking at 210 reset to 200bar?

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 Post subject: Re: sdi injectors
PostPosted: Mon Sep 18, 2017 10:54 pm 
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I would suspect that they are either standard 25/45 etc injectors or that someone has fitted 200/400 nozzles to 25/45 injectors perhaps.

If you are running a standard map at the moment you'll probably only notice that the engine is a little quieter. The biggest factor is the secondary pressure which is the same for both sets of injectors. (200/210 bar is only the primary pilot opening pressure - the secondary stage is where most of the fuel flows in).

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 Post subject: Re: sdi injectors
PostPosted: Tue Sep 19, 2017 1:40 am 
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they have 200 bar stamped on them and the engine performed very well with them in...it passed 3 mots with a fast pass,this year the smoke was very visible when revving the engine. after refitting the origional injectors the smoke has gone along with the performance which means the injectors were the cause?
when my new manifold gasket arrives from DGMRS i will refit them and see what happens.its currently running on std map,when im happy with everything i may get it mapped.
the current spec includes a ronbox, k&n filter, egr blank, 19psi boost and a straight through exhaust. i was very pleased with the performance when the sdis were fitted.

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 Post subject: Re: sdi injectors
PostPosted: Wed Sep 20, 2017 6:01 pm 
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sdis refitted today,boost readjusted to 19psi and its back to normal...power back and little smoke :D

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