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Engine Specific Info and Questions => IDI Engine => Topic started by: TD Passat on September 16, 2005, 09:48:15 am
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How many miles will i get to the 70Litre tank in my passat?
Just everyday driving.
Craig
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hi
after i did a pump for Chris, his passat got a whopping 1150 km for
one tank of fuel, i think it was 68 liters.
Giles
before my super pump he didn't get this kinda mileage.
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Did you modify the pump specificly for mileage, or was it the standard power up magic you do?
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yes i did my full magic on his pump which made a big diff
he got the better mileage when he didn't have to push his car
as much to go the same speed as before.
Giles
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hi
after i did a pump for Chris, his passat got a whopping 1150 km for
one tank of fuel, i think it was 68 liters.
Giles
before my super pump he didn't get this kinda mileage.
Whats that? 1150/68 =16.9..A/C as well?
My Quantum just did 988 km to 52.5 litres or 18.8km/litre This was 2/3 town driving.
Best ever run was 21.1km/ litre No A/C :evil:
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You have an Estate or a limousine TDpassat?
What kind of diesel you got in there?
AAZ or 1Z?
On my passat variant I do no less than 1000 miles per tank and as much as 1400 miles.
I drive for it, but I get results too. :D
95 litres tank comes standard on variants. :twisted:
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Its a 1994 1.9 TD Saloon. Fuel gauge indicates 70litres.
Craig
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At 47 mpg (imperial gallons, or 6 litres per 100 km) you should at least get 700 miles per tank.
I've heard AAZ engine getting in the low 5's so 900 miles to the tank.
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his car is a AAZ Pasat
we did a full upgrade on the pump, changed the turbo to the bigger
unit from 1.6L and added an intercooler.
we dynoed his car at 100 HP at the wheels.
he drives about 50:50 hwy and city. hwy does 120 Km/Hr
city is mostly sitting in traffice
Toronto is really bad right now.
Giles
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what kind of charge is there for doing a pump? Does the turbo also have to be changed?
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I find my turbo spinning nearly all the time. Sitting at 70mph constant in 5th it is boosting to 10psi. If i back off the boost drops but the car starts to slow down.
In my other turbo'd car i can back off so the boost drops below the 0psi mark but stays at a constant speed. Like a N/a engine.
Any tips on stopping it running boost all the time? Is there a mod so i can run the boost when i need it. ie accelerating.
Craig
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Any tips on stopping it running boost all the time? Is there a mod so i can run the boost when i need it. ie accelerating.
1) Do you have a factory switch on the pump that opens when the throttle lever (also on the pump) is in idle/neutral position? Wire that switch to a boost solenoid running to your wastegate.
This way the solenoid will always stay open to bleed boost to wastegate until you press the accelerator pedal. Pressing the accelerator pedal will pull the throttle lever on the pump away from the switch (at least 5-10% or wherever you want to adjust it).
You can use the solenoid as a regular boost controller too.
2) Just install a $1 switch on your dashboard and wire it straight to the boost solenoid. Manually flick the switch on when you don't want boost. Might be convenient for long highway drives, but it would otherwise be annoying having to flick it on and off constantly.
... or you can use the in-dashboard switch to activate the throttle switch on your fuel pump. Adjust the switch on the pump to prevent boost if you press the accelerator pedal to within 40% for example. Turn it off if you're in strictly city driving.
3) Larger turbo.
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hi all
i charge $950 Can for a full performance upgrade/rebuild
Giles
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hi
u said that your other turbo'ed motor doesn't spin up boost on the hwy
what motor is that?
the reason your diesel pushes boost all the time is because the engine
needs the boost to run at the throttle/speed that you're doing.
Giles
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My other car is a Mk3 Astra Turbo with around 360PS. It is quick!!!
Still running as standard on the TD.
Craig
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Does anyone have a diagram of how to bypass the standard switch? And how to wire it to the boost solenoid and which wire colours?
Craig
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Just recently I did 1316.8 km / 74.74 l that makes 5.675 l per 100 km.
GOOD JOB GILES :lol:
PS.This time 65% HWY and 35 % CITY
sincerely :twisted:
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hmmm a reverse wastegate would seem to be what you need to boost only when you need it.
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Craig, your Astra has a petrol engine, right? My turbo Talon (petrol) does the same thing as your Astra at any cruising speed. It reads zero boost, no matter how fast I'm cruising. But that is how petrol turbo engines are supposed to behave, because they are throttled.
OTOH, it is perfectly normal to see some boost at all times on unthrottled diesels, especially with a very small turbo or with a high weight-to-horsepower ratio like your Passat. A little bit of boost actually improves the thermal efficiency of a diesel, and IMO is not something you should try to defeat.
If you are looking to improve your fuel economy there are several things that can be done, but turning off the boost is not one of them. First, keep in mind that every country's MoT is most interested in cutting diesel emissions, so your engine is both injection-retarded and choked off at the exhaust. Fixing these issues and intercooling the intake charge will do wonders for your fuel economy without attracting undue attention from the authorities.
Of course, the ultimate injection solution is probably Giles' treatment, that might be a bit of work from Scotland, but if you follow the work pioneered by fspGTD and SMOG, you can see huge improvements yourself for the cost of a little time. There is a thread in the FAQ section detailing SMOG's refinements, however, I don't have a direct link to fspGTD's thread on retiming the pump and changing the governor springs, but you can search for it in the IDI section, or if we are lucky, someone will chime in with the direct link. Also, any muffler shop can build and install a turbo-back 2.5"-3" exhaust that will largely eliminate all that dreadful backpressure. Finally, add an intercooler to extract compressor and engine bay heat from the intake charge.
Think performance stuff for your Astra. Pretty much anything that adds power to a turbo'd petrol engine will do the same for a diesel. The idea that these are old tractor engines that don't respond to hot-rodding is so...20th century!
Enjoy the ride! :D