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General Information => General => Topic started by: Dr. Diesel on June 15, 2004, 02:20:22 am
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Couple of short stories.
Yesterday I found myself at a red light next to some US musclecar. It almost looked like a pinto, but had a cammed (by the sound) v8 of some sort, huge rear tires and dual exhaust. Some punk kid driving it. He was torking it at the lights, looking at me. I ignored him. Lights turned green, and he was on and off the gas like an old pedal organ. Next light was red, we stopped. I gave a little blip of the throttle. That really wound him up. An A2 golf showed up too. Lights turned, and I was out of there like a shot. I was deep into 4th before slowing for the next light. The whole time I could hear the v8 roaring, but couldn't see him. (didn't want to look BACK while ripping along)
He turned off a side street rather than stop next to me. Sucker.
Today, my friend and took off out of my shop's parking lot together, him leading. He's driving a new GTI 1.8T. We turned down a sidestreet and both gunned it. In the time it took my turbo to spool up he'd pulled ahead 2 carlengths. After that, for 2nd and 3rd I was stuck to him like glue. In 4th, i started to catch up, though he might have let off at that point.
Not bad for an old kerosene-burning rattlebox!
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..and afterwards, don't you wish they could hear you yelling "and its a DIESEL suckaaaa!!!!!" :lol: nice.
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I'm really looking forward to meeting both of your and check out your über-quick Diesels :lol:
Hey, I've been trying to get in touch with Giles in the hopes that he could make it down as well, but I just got off the phone with Superior Fuel Injection and was told that Giles is on vacation until Friday, and I never got a reply to a PM I sent long ago... :(
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yeah, he's hopefully not drinking the water in mexico. Probably hasn't seen a pm yet.
I'm eagerly awaiting his return myself.
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i wouldn't say uber-quick... but its not a slug thats for sure.
i need bigger exhaust and the fun begins. bryson's car can move! :D
looking forward to meeting all you diesel crazies myself!
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Can we get some details on your ride, Dr. Diesel?
Drew
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the basics:
A2 jetta 2720 lbs driver, 1/2 tank
1.6L 30 psi unintercooled w/ GILES pump
3rd gen downpipe, 2.5" exhaust
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1.6L 30 psi unintercooled w/ GILES pump
OK, two questions -
1) what are you using for a head gasket, titaniium?
2) what in blue blazes is a GILES pump ? :)
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stock OE headgasket & bolts.
Do a search on here for 'Giles' and 'superior fuel injection'.
He's the dude who modifies bosch VE pumps so that a diesel can actually make some power. (you're wasting your time without one, IMO)
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stock OE headgasket & bolts.
Impressive... :) I have some low spots on my deck, and more than 20 seconds at 14psi at the manifold and I see coolant where it shouldn't be... :) Of course, at those manifold pressures the K03 is in the "danger zone" anyways.
Do a search on here for 'Giles' and 'superior fuel injection'.
He's the dude who modifies bosch VE pumps so that a diesel can actually make some power. (you're wasting your time without one, IMO)
Well, that search string yielded one post - yours... :) However, I was able to find a few threads that referenced Giles and governor modifications - which made for interesting reading. Methinks I'll pop the cover on a scrap pump and have a look at what is involved in the "governor" mod - but it'll have to wait until the Scirocco isn't on daily driver duty... :)
Note - the Bosch Diesel Injection book I have refers to an "idle and maximum speed" governor (http://scirocco.cs.uoguelph.ca/gtd/bosch-ve/governor_4.jpg) which sounds like the desired effect of this mod (compared to the variable speed governor:
http://scirocco.cs.uoguelph.ca/gtd/bosch-ve/governor_2.jpg and http://scirocco.cs.uoguelph.ca/gtd/bosch-ve/governor_3jpg)
Does the "Giles" treatment entaiil further modifications, like upgraded plunger size, timing advance etc?
Drew
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plunger yes. timing i'm not sure. giles is the pump man, when i get everything setup properly i'll be sending a pump to superior, can't wait! :D
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Plunger yes, if you want it. But an upgrade to a 1.9L camplate will yield more available fuel than you'll likely ever need. At 30 psi, I still have more available. There's much more to a Giles pump than simply replacing the max speed govenor. Best thing is to call him. He'll be back from vacation on monday.
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But an upgrade to a 1.9L camplate will yield more available fuel than you'll likely ever need.
Would it be easier to install the 1.9 pump (with appropriate modifications, of course) and injectors on the 1.6?
At 30 psi, I still have more available.
At the kinds of rpms that I've seen discussed here, you don't need more fuel, you need a time warp inside your combustion chambers so what's jammed in there has more time to burn. Seeings that's pretty unlikely, the next best thing would be fuel that burns faster than diesel does. Diesel does have more energy than gasoline, but it takes longer to release it too!
There's much more to a Giles pump than simply replacing the max speed govenor. Best thing is to call him. He'll be back from vacation on monday.
Are we discussing trade secrets that should not be posted at risk of angering Giles, or is he willing to discuss the nature of these mofifications extensively?
Drew
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Part of the Giles package includes mods to the advance mechanism. In stock form, it stops advancing a lot earlier than you'd expect. (i don't remember rpm numbers now)
Most, if not all the mods he does were discussed at one time or another, though mostly in the old forum. Since then I've become good friends with him, and out of respect for him, suggest anyone interested feel free in calling him directly to discuss mods. Nobody's trying to keep secrets here, which is why i'm always saying CALL GILES.
Here's his number again:
Giles @ superior fuel injection 905-475-1122
Markham Ontario
The 1.9L pump requires use of the 1.9L engine's pump mount bracket, which won't fit on the the 1.6L engine.
My engine still pulls hard at an estimated 6000 rpm (tach doesn't go that high)
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i don't think that 95% of us will ever need any more fueling than a pump like the one dr. diesel is running. i mean, 30psi and you should see the soot that car still blows! :shock:
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The question is not how much soot the car blows, but at what rpm does the car blow soot?
If it's blowing soot through the entire rpm range, then it is overfueled for the air charge at the given rpm and boost level.
However, soot at high rpms (approaching or exceeding stock goverened speed) implies that the amount of fuel injected cannot be burned within the combustion window - which in terms of degrees of crankshaft rotation is the same size, however in terms of real time, occurs in half the time at 6000 rpm as it does at 3000 rpm. At this point soot will occur regardless of intake charge - even with a boost pressure of 60 psi the engine will smoke, because the fuel doesn't have enough time to burn completely before it is expelled via the exhaust valves.
Running fuel with a higher cetane level decreases smoke because the fuel will ignite earlier in the compression stroke, meaning more of it will be burnt. - I believe I read Dr Diesel has shaved pintles as well to advance the start of injection?
Although the concept of the (really) high speed diesel seems to me to be wasteful, and in the long term, detrimental to the engine (and the environment... :) ) It's still pretty damned cool though, having said that, and I would love to see it in action.
Drew
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I'm constantly making changes to the settings on my pump and boost. Literally, it's never the same one week to the next. I find even weather changes make significant differences in how my engine runs. Usually, I have the old hunny set to an economical, clean burn. For racing, I have found a little smoke under full boost isn't quite as powerful as a lot of smoke, and certainly, with such overfueling, turbolag is significantly reduced, much to the chagrin of bystanders or behind-drivers.
Bottom line is, without additional complicated mechanisms, a mechanical pump is always going to be a compromise between power and emissions.
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Agreed on all counts. This past winter I had a blast with the Scirocco, as it could handle very agressive fuelling with relatively little smoke. I'm still trying to find the compromise now that the warmer weather has arrived. On a recent caravan with a number of other Scirocco owners I was branded the mosquito repellent... :)
Last night I swapped out my A1 airbox for a slightly modified A2 airbox, which did make a noticeable improvement in off-boost and low-boost performance, but I'm having trouble coming up with an LDA cone setting that has sufficient fuelling above 6 psi and doesn't smoke like a pig below 6 psi. In the end, I may surrender unplumb my intercooler for now, as I just don't spend enough time on boost above 6 psi to make it worth while.
Drew
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A lot of what you guys are describing regarding engine tune, sounds a lot like intercooler heatsoak effecting the charge, and simply warmer, less dense ambient air.
When its cold or cool the fmic in my car is adequate (thermally, but mass flow wise its crap). However, when the temps get over the 60s, the fmic will heatsoak too quickly. Granted, there is still more than enough power, but I know far more power is being wasted to heat.
A *real* fmic is on its way... :twisted: