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#184573 - 12th Nov 2007 11:40am smoking diesel
Petei123 Offline
Smartchild

Registered: 10th May 2007
Posts: 558
Loc: Prenton
hello eveyone, i bought myself a '96 pug 306 on saturday (will start a MMC when i get home) anyway. when i took the car 4 a test run, i booted it on the motorway and no smoke from the exhaust and was fine on the way home. but last night when i went on a drive a noticed smoke coming from the exhaust when i put my foot down, but when cruising non at all. i got up this morning and noticed that the side where the exhaust is, is black up the boot and part of the number plate?

can anyone help me?????

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#184574 - 12th Nov 2007 11:48am Re: smoking diesel [Re: Petei123]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Diesels smoke - end of.

Its just more noticable at night in headlights etc.

Excessive smoke is caused by over fueling - common problem is a blocked airfilter (wont hurt the change that) if it still does it, take it to a garage and get them to set up the diesel timing on the diesel pump - its dead easy on those engines smile

It could also be a weak actuator, ie the car is fueling for more boost that its getting, and thus giving a richer mixture...


Edited by StuyMac (12th Nov 2007 11:50am)
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#184575 - 12th Nov 2007 11:57am Re: smoking diesel [Re: StuyMac]
Petei123 Offline
Smartchild

Registered: 10th May 2007
Posts: 558
Loc: Prenton
nice 1 stuy. i'm gunna book it in 4 a service this weekend hopefully and c what they say. that lad i bought it off only put it thru 1 3 weeks ago he said and said i had all the boost etc set by a specialist (running at somethin like 18psi?) but i'll c what they say when i get it serviced!

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#184576 - 12th Nov 2007 12:26pm Re: smoking diesel [Re: Petei123]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
18psi is a little high.

15psi or 1 bar is up from std, but safe.

They may have turned the boost up, and increased the fueling to suit. As 18 is maybe a little higher that it normally gets increased to, maybe they overfuel it a little to be safe...
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#184582 - 12th Nov 2007 3:12pm Re: smoking diesel [Re: StuyMac]
MattLFC Offline
Wiki Master

Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
Dont worry about the boost, its standard for a stage 1 tune to be set at ~18psi, the engines were originally built to do it anyway, but then lowered because the it helps prolong the life of the turbo of course and also because they couldnt have a derv outrunning a the XSi.

Is it a KKK turbo?

smile

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#184585 - 12th Nov 2007 3:24pm Re: smoking diesel [Re: MattLFC]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Maybe the fuel is still set for 18psi, and the actuator has weakened and thus over fueling then.

If its proven, then I guess its ok, but 18psi is quite high for a std car, the Nissan only runs 19psi on a bigger turbo, that lil derv blower must be working is socks off - no wonder they dont last laugh

I know 3 people who turned the boost up on those engines, 1 did a HG and the other 2 did the turbos, a record id steer on the safe side of myself smile


Edited by StuyMac (12th Nov 2007 3:25pm)
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#184586 - 12th Nov 2007 3:34pm Re: smoking diesel [Re: StuyMac]
MattLFC Offline
Wiki Master

Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
If he had it set by a specialist, id assume there would be some comeback if anything untoward happened to the turbo as a result of it? All the peeps on the 306 forums are running at upto 18.5 on standard setups (although very few go past 18) without problems, I know you can add a 406 IC and go even higher, but its hassle.

Was it a guy in shropshire who did the tune by any chance? Forget his name, but peeps know him as the dervdoctor, he got a excellent rep, got the rr etc... Thats where all the DTurbo guy's seem to go locally.

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#184707 - 12th Nov 2007 10:02pm Re: smoking diesel [Re: MattLFC]
Petei123 Offline
Smartchild

Registered: 10th May 2007
Posts: 558
Loc: Prenton
i text the lad i bought the car from before and said it was running 19psi and the fuel had been set by a specialist from the previous owner. i have a book full of recipts from him so will have a scout around in ther 2 c if thers anythin that is to do with the boost/fueling

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#184715 - 12th Nov 2007 10:18pm Re: smoking diesel [Re: Petei123]
MattLFC Offline
Wiki Master

Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
19 is a bit high to be honest, even if it was done by a specialist, without an IC it will cause problems for sure, even if they are only minor, and will deffo shorten the life of the turbo.

18 is the recommended, and as stuy says, thats quite a substantial increase already.

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#184718 - 12th Nov 2007 10:27pm Re: smoking diesel [Re: MattLFC]
Petei123 Offline
Smartchild

Registered: 10th May 2007
Posts: 558
Loc: Prenton
so how do i go about lowering the psi then? how much does it cost?

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#184723 - 12th Nov 2007 10:34pm Re: smoking diesel [Re: Petei123]
MattLFC Offline
Wiki Master

Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
You can do it yourself quite easily, you will also need to adjust the fueling as well. You will need a boost gauge however - well some peeps risk doing it without it, but I wouldnt.

Here is a bit of info on the KKK turbo - http://www.pug306.net/forum/index.php?showtopic=12965

If you subscribe to their community supporter package (it was 5.00 per year when I signed up), one of the perks is summit called the bible... its absolutely fantastic resource, better then a Haines manual.

The guys on them forums will tell you absolutely anything and everything you need to know about 306's, help you with anything.

smile

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