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Old 12-14-2005, 05:39 AM   #1
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Tdi

Alright, been meaning to ask this question for a while, but never got around to it...what's TDI? You see it on VW Golf's, and for a while I thought it was Turbo Diesel Injection
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Old 12-14-2005, 05:41 AM   #2
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Quote:
``TDI'' stands for Turbo Direct Injection, meaning that not only is the engine's intake air compressed by a turbocharger for greater efficiency, the fuel is injected separately and directly into each cylinder at the appropriate time, not into the intake manifold as in a gasoline engine.
http://www.theautochannel.com/news/2...03/198308.html
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Old 12-14-2005, 05:49 AM   #3
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Quote:
Originally Posted by car_crazy89

Thanks for the link...so it's got a turbo with better fuel efficiency?...Or just at a lower speed?
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Old 12-14-2005, 07:29 AM   #4
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Quote:
Originally Posted by chris_knows
Thanks for the link...so it's got a turbo with better fuel efficiency?...Or just at a lower speed?
that's not how i'm reading it. what i'm getting is that it's a diesel engine with a turbo (which increases the efficiency of the air intake). but of course that's just how turbo's are. it gets good fuel efficiency because it's a diesel engine.
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Old 12-14-2005, 02:04 PM   #5
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Quote:
Originally Posted by pik_d
that's not how i'm reading it. what i'm getting is that it's a diesel engine with a turbo (which increases the efficiency of the air intake). but of course that's just how turbo's are. it gets good fuel efficiency because it's a diesel engine.

That's what I was thinking, but here's a quote from there:
Quote:
...the engine's intake air compressed by a turbocharger for greater efficiency
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Old 12-14-2005, 03:10 PM   #6
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It stands for "Turbo Direct Injection".........

TDI Info

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Old 12-14-2005, 07:29 PM   #7
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Quote:
Originally Posted by chris_knows
That's what I was thinking, but here's a quote from there:
i'm pretty sure that quote is basicly trying to describe what a turbo does in one sentence. a turbo pushes more air into the cylinders (constant volume, well... at the same time in each cycle it's the same volume every time), so it's compressing the air, yielding greater engine efficiency (more power output per revolution).
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Old 12-14-2005, 08:57 PM   #8
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Quote:
Originally Posted by pik_d
i'm pretty sure that quote is basicly trying to describe what a turbo does in one sentence. a turbo pushes more air into the cylinders (constant volume, well... at the same time in each cycle it's the same volume every time), so it's compressing the air, yielding greater engine efficiency (more power output per revolution).

Cool, thanks for clearing that up

BTW thanks for the link, theman352001
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Old 12-14-2005, 10:20 PM   #9
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Here in the UK, where diesels are more comon....the TDi can be found in numerous cars....rather than just VW's as in the US I believe

although they're being fased out (or seem to be), by more efficient comon rail units
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Old 12-14-2005, 10:25 PM   #10
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yea, i havnt seen the TDI badge on anything but VW's...

what's a common rail unit?
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Old 12-14-2005, 10:35 PM   #11
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Quote:
Originally Posted by pik_d
yea, i havnt seen the TDI badge on anything but VW's...

what's a common rail unit?

On the TDI badges...

Here's a link on common rail units:
http://www.swedespeed.com/news/publi...inter_272.html

Seems pretty useful...
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Old 12-14-2005, 11:39 PM   #12
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The Golf/Jetta TDi's from VW are really nice if all you care about is mpg, they are slower than slugs stock but you can pep them with a new exhaust and chip (which alone can add upward of 50hp 75tq). My friend gets about 45-50mpg on the highway with his '00 1.9L Golf TDi hatch. It's as slow as a slug though, only has 90hp trying to move 2850lbs. The fun thing is the torque, 155ft-lbs at only 1900rpm. We actually did a funny race where I raced my Accord against his TDi and it wasn't even close, my Accord pulled away pretty fast, LOL. I keep begging him to try out a big 3" exhaust and chip it to see what kind of acceleration he can get out of it then, but, unwilling to spend the money.
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Old 12-15-2005, 12:10 AM   #13
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look at the redline of the car though.

it HAS to make it's torque down low, or else it wont make it at all.
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Old 12-15-2005, 02:23 AM   #14
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Quote:
Originally Posted by pik_d
look at the redline of the car though.

it HAS to make it's torque down low, or else it wont make it at all.

Still makes peak torque damned early. Thanks to it being a diesel
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Old 12-15-2005, 02:34 AM   #15
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if you're saying a car with a gas engine cant do that, you're saddly wrong. look at the vw gti 1.8t. gas engine, makes it's peak torque at 1950rpm's. not too much higher then it's TDI brother.

though of course that's due to the tuning of the car (more specifically, the turbo).
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