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Injection pump timing report
Well I checked my pump timing as I have never gotten around to it since buying the car almost 2 years ago. Following the procedure in the FSM my timing is 0.775mm. The book states:
"D24 (exc. USA/Canada) : 0.90mm D24 USA/Canada 82-83 : 0.80mm D24 USA Federal/Canada 84-? : 0.85mm USA Calf. 1984-? : 0.75mm" So it appears the car is timed to California specifications ... we can do better than that. My plan was to time it to 0.85mm, which puts me right at the US Federal specification. Of course the Rest Of World spec. of 0.90mm might be a better choice. However I did note on the VolvoTurboDiesel blog that 0.95mm was the hot ticket: http://volvoturbodiesel.blogspot.com...1_archive.html So what are the thoughts of the collective? 0.85mm, 0.90mm, or even more advance? My car runs "fine", but its all I've known from it. Peppy, easier starting, better MPG are all attributes I'm hoping for, perhaps > 0.90mm is the way to go?
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Jim 1985 Volvo 740 GLE turbo diesel |
#2
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Schaizze it was d24 :P forgot what i sayed, my mistake
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#3
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I would time it up to .90 or .95 More timming will just give better mileage, more power, etc... About the only draw back is more timing rattle (engine noise) and a rougher idle, though with the straight six the rougher idle is much less noticeable than it is with the 4 cyl vw 1.6. I had the timing on my '85 Jetta Turbo diesel set as high as 1mm, but the idle was a bit rough, and i didn't notice any increase in mileage so I went back to .95mm. Thats where I plan to set mine, I just barrowed the gauge from a friend and plan to time it tomorrow.
Jason
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Back again with a '84 760 GLE D24T/ZF SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped My engine build: http://www.d24t.com/showthread.php?t...t=engine+build T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics! |
#4
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Mine is set at 1.1mm of stroke and it loves it. Not too much more clattery, but much better throttle response and better take off without boost. Easily starts too. I would time it to at least 1mm, why not? It doens't run rough like the 4cyl version does with more timing (or at least you cant feel it).
Jason
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Back again with a '84 760 GLE D24T/ZF SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped My engine build: http://www.d24t.com/showthread.php?t...t=engine+build T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics! |
#5
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I set mine at about .90-.95mm. It starts great and decent power.
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#6
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You need to be careful running too much advance, it can cause serious problem. (like melted pistons, etc) I'd say european spec is probably fine, since chances are the us spec is retarted for emissions reasons. Not sure about anything over .95-1.0 though. If you get too advanced it becomes counterproductive because you're injecting too early. There is an optimum.
For anyone who's really serious about tuning, I'd suggest getting a pyrometer to watch your exhaust gas temps because that gives you a pretty good idea what's going on in there and gives you some warning if it's running too hot. |
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