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Engine Specific Info and Questions => IDI Engine => Topic started by: carrizog60 on September 11, 2011, 10:23:41 am
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hi
i just love the sound of that on diesels,and no,my passat doesent have 75hp so it moves fairly well(for the ones that will say is goofy to have that on a slow car).
i think that there is more people interested in this, from reading other topics i can see that, so lets try to talk what can be done to achieve this and still have a good working order pump(off idle).
a friend of mine had this issue and it turned out to be a malfunction delivery valve.
knowing the function of the DV what can cause idle to lope?
and what about governor springs ?
changing the strength of the idle spring would have what benhavior?
i read on other topic(mtdi pumps related) that changing the position of the shaft where the flyweights atatch could lead to more fuel due to less intervention of the governor but also erratic idle.
if erratic idle is another word for lope or hunting idle that would be great,and if more fuel would be other effect that great...
any pump builder ou there that had messes with this setting that can scheme in and debate this?
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Thicken your fuel till the idle compensation can't happen fast enough :-\
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but that would increase pump pressure and timing beyond safe values.
if the trick is to make the idle spring not to act fast enough would changing idle spring strength achive that?
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Im interested in this topic also! i wanna make my pump hunt at idle, sounds soo good!
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the only reasons pumps hunt at idle, is because of a ill-adjusted governor..
the first hunting diesels were the detroits.. and you could make them idle smooth as silk if you knew how to adjust the governor buffers right..
the 16V92 that AF DICK has in there land speed racer, it has 4 super chargers, 4 sets of compound turbos... starts and idles quite smooth.
me, personally, i love that our pumps idle smooth.. take a car with hunting idle, and put it in a slow moving traffic jam.. you will want your smooth idle back in a right hurry..
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Yah, I like the ability to crawl along in gear at idle smoothly.
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i love how our engines sound stock at idle (most of us atleast)
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I think leaks in the IP and elsewhere in the engine can also cause a hunting idle. I replaced all leaky seals in my IP and did a head gasket job a month ago and the idle is now nice and steady.
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i dont have the problem of cruising at idle,so there wont be any driving issue.
assuming that a malfunctioning governor what can be done to achieve that?
was hoping that more experienced on diesel pump build freaks help a bit...
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i dont have the problem of cruising at idle,so there wont be any driving issue.
assuming that a malfunctioning governor what can be done to achieve that?
was hoping that more experienced on diesel pump build freaks help a bit...
the pump wizards know how to set the governors right.. so there wont be a hunting idle.
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Why do you want a hunting idle exactly? To sound cool? I don't quite get it.
How do they get the Cummins to hunt? They utilize a Bosch vertilliere (sp?) pump same as we do.
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Why do you want a hunting idle exactly? To sound cool? I don't quite get it.
How do they get the Cummins to hunt? They utilize a Bosch vertilliere (sp?) pump same as we do.
To get cummins to hunt they just put bigger injector lines them. But i think that is bad because its not getting fuel for a split second.
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i want the idle like that because i like the sound.
the same way people like to hear the turbo on straigh pipes,or some like the WG discharge to atmosphere.
if someone know hot to set it right,is very possible to know very well how it works and then also know how to make it lope.
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Agreed ^^^ I like to hear the sound also! I think it would be kinda tough to get our IDI's to lope. I wish someone who knew these pumps really good would chime in
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I had to do research to figure out what we are talking about, and I LIKE It. Yesss how do we get that??? I I have a late model mustang that has a pretty significant cam that does this too
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Why do you want a hunting idle exactly? To sound cool? I don't quite get it.
How do they get the Cummins to hunt? They utilize a Bosch vertilliere (sp?) pump same as we do.
To get cummins to hunt they just put bigger injector lines them. But i think that is bad because its not getting fuel for a split second.
its that, and the fact that the governor fly weights are usually modified, and that doesnt help out either. but yes, alot of it has to do with going OVER SIZE on the injector lines..
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been doing some thinking, and some more thinking.. and from the way i understand things, is that you MIGHT be able to make your pump lope with a SOFTER idle spring.. i dunno how soft you would want to go tho.
this is all IN THEORY.. theres no way im taking my governor apart to try it, someone else that ACTUALLY LIKES the sound of a crappy governor can try it out and report back if they want..
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Yeah if someone else wants to try it, do it! report back tho!
That sounds like it will work ROR But no way in hell am i taking mine apart haha
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instead of screwing with the pump, if you were really keen on it you could use a flasher relay to power the fuel solenoid on the pump. you'd just need a micro switch to switch it over when the throttle lever was in the idle position. That way you could even turn it off when you go crazy.
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I put a non split shot computer on a truck with split shots, and startup sounds just like this....
<iframe width="420" height="315" src="http://www.youtube.com/embed/TV4IP09ey6k" frameborder="0" allowfullscreen></iframe>
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I put a non split shot computer on a truck with split shots, and startup sounds just like this....
<iframe width="420" height="315" src="http://www.youtube.com/embed/TV4IP09ey6k" frameborder="0" allowfullscreen></iframe>
what is a non split shot computer?
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been doing some thinking, and some more thinking.. and from the way i understand things, is that you MIGHT be able to make your pump lope with a SOFTER idle spring.. i dunno how soft you would want to go tho.
this is all IN THEORY.. theres no way im taking my governor apart to try it, someone else that ACTUALLY LIKES the sound of a crappy governor can try it out and report back if they want..
softer VS harder spring
what would be the behaviour of the idle?
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been doing some thinking, and some more thinking.. and from the way i understand things, is that you MIGHT be able to make your pump lope with a SOFTER idle spring.. i dunno how soft you would want to go tho.
this is all IN THEORY.. theres no way im taking my governor apart to try it, someone else that ACTUALLY LIKES the sound of a crappy governor can try it out and report back if they want..
softer VS harder spring
what would be the behaviour of the idle?
softer spring would make the idle spring compress too much, then let it off, causing the engine to hunt..
stiffer spring would probably be no different.. the late pumps dont even have an idle spring, just a shim.. but, the late pumps have accomodations for the idle spring still, its just not there.
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what is a non split shot computer?
Some Powerstrokes and TDIs have 2 stage injectors that do 2 squirts per event(AKA split shot), it burns cleaner and a little quieter.
When I swapped the truck to manual transmission, I used a manual trans computer from a truck that had single stage injectors.
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what is a non split shot computer?
Some Powerstrokes and TDIs have 2 stage injectors that do 2 squirts per event(AKA split shot), it burns cleaner and a little quieter.
When I swapped the truck to manual transmission, I used a manual trans computer from a truck that had single stage injectors.
so not a idi thing...
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softer spring would make the idle spring compress too much, then let it off, causing the engine to hunt..
any ideas on what type of spring?
i dont have idle spring on the governor...
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softer spring would make the idle spring compress too much, then let it off, causing the engine to hunt..
any ideas on what type of spring?
i dont have idle spring on the governor...
well, i would find a idle spring, and go from there..
since im not even interested in this thread really, im not going to be the one fooling with his pump to figure this out..
take the idle spring, measure it.. (spring rate, diameter, length) and go from there..
start installing progressively softer idle springs till you get the crappy idle you so desire..
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its like adding a straight exhaust.
some people will say that is a crappy exhaust sound...
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you want your diesel to hunt..
the only time it hunts if you didnt make it do it, is if something is messed up, and it idles crappy..
if there were some REASON for the engine to lope like that, like from huge injector lines, or a DELETED governor, then i could see the loping..
but on a stock engine, its just going to sound like hell..
the only engine that should be loping, are cold 7.3's and Jimmys..
thats just my take on it atleast.. i like smooth idle on ALL my rigs.. even the gassers.
theres too many retards on the roads around here, from april to october, all the speed limit sighs mean nothing. you just go along at 20-30 mph because nobody knows how to drive.. sometimes you go alot slower than that even.. there were hundreds of times this year that i had to idle along in first gear for miles.. i would be wanting to kill my car after about 500 yards of it loping/bucking..
anyhow.. to each there own.. it doesnt affect me how crappy your car idles. go for it, start putting soft idle springs in your pump. some spring will give you the desired crappy idle characteristics.
i hate living at the beach..
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You can move to McMinville and really have a traffic problem. I think I would stay where you are. Isn't it only during tourist season that the traffic sucks like that?
Move South of Florence, that is where it is just right.
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i am in portugal,dont have trafic problems on were i live.
i have a passat 35i variant 1.9d(1Y),with 1Y custom intake,megane rs front intercooler,vnt2052v turbocharger,tdi gearbox,oil cooler,60mm stainless exhaust,and i am building a 11mm pump.
that is not a "stock" engine,and will(if pump work like i hope) sound bad ass at idle and perform on he road the same way.
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its not sleeper status tho.. diesels should all idle like a stock diesel.. that makes your opponent that much more surprised/pissed off when you go smokin by him..
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I don't have opponents lol
I ride smooth,the idle thing is for self-pleasure ;D
The land rover TDI pump arrived, so the 11mm donor is at home.
The plan is to build the pump the regular way (to be easier to pinpoint problems) and then when all is ok try to adjust the springs strength
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Thicken your fuel till the idle compensation can't happen fast enough :-\
Hello, what do you mean by Thickening the fuel? Make it more viscous?
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Adding some diesel fuel additives can increase the thickness of the fluid. This leads to higher internal pressure and with some additives more Cetane which will add power to the fuel.
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You don`t have to put a spring for the idle. Just put it on the other way round.
When my diesel was hunting at idle, the only way I could not get it not to hunt was at 2000rpm.}
That`s what the diesel shop mechanic told me anyway, that I had the spring on backward, could be true.