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Old 18th September 2007, 08:55   #1
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Default Turbo in Octavia 1.9TDi

Hi guys,
I wanted to get this query solved for some time now.
Pardon me if this query is too noobish

Ok here it goes,
It is a known fact that the Octavia 1.9TDi comes with a Turbo, now as far as my knowledge goes, there is a turbo lag in any turbo fitted car.
For example in the Swift Diesel, the car shoots after 2k RPM, i assume this is where the turbo kicks in.
Now i have had the Octy for over 2.5 Yrs now and how much ever i have tried, i have failed to recognize when the turbo kicks in.
So my question is simple, When does the Turbo in the Octy Kick in [@ what RPM] and i don't know if its just me but why don't i feel it kick in as in the swift ?

Amey
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Old 18th September 2007, 09:21   #2
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The absence of turbo-lag shows how well-matched and engineered that turbo-diesel is! The fact that its a smaller turbo also helps in reducing lag. If I remember correctly, it kicks in around 1700 rpm.
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Old 18th September 2007, 09:31   #3
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1700 RPM, thats nice.
It surely is a well engineered car, no wonder its fun to drive even though its non CRDi and is a simple Direct Injection Diesel Motor.

@ GTO, would like to know more about - 'Smaller Turbo"
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Old 18th September 2007, 13:45   #4
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Amey, when the turbo is smaller in size, there is very little lag.
Downside of a small turbo is it produces lesser boost than a bigger turbo.
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Old 18th September 2007, 14:13   #5
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Quote:
Originally Posted by nitrous View Post
Amey, when the turbo is smaller in size, there is very little lag.

Little lag in smaller turbo so you will not recognize the turbo lag.

In Impreza turbo lag starts at 2k and turbo kicks in after 4k.
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Old 18th September 2007, 14:59   #6
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Quote:
Originally Posted by Mugen_Power View Post
In Impreza turbo lag starts at 2k and turbo kicks in after 4k.
lag starts at 2k ? mind explaining?
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Old 18th September 2007, 17:21   #7
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Quote:
Originally Posted by shazikon
lag starts at 2k ? mind explaining? __________________
I guess he means at 2K rpm there is a distinct lack of performance which lasts until 4K rpm when you feel the turbo kick in.

That is why now, many manufacturers (BMW in the 525d) are using two turbos...

A smaller one for low RPMs and a larger one for higher rpms. This more or less eliminates Turbo Lag and you get good performance even at higher rpms.

Another way is the method Porsche is following. VGT or Variable Geometry turbine.

Here, the geometry of the vanes of the turbine change depending on the rpm to give maximum performance.
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Old 18th September 2007, 17:28   #8
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Thanks for clarifying my doubts

Any scope of adding a bigger turbo ?
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Old 18th September 2007, 17:37   #9
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It wont help in your car.... the engine capacity itself is just 1900cc.

It would be better if you get a Pete's tuning box....
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Old 18th September 2007, 17:41   #10
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Quote:
Originally Posted by nikhilb2008 View Post
It would be better if you get a Pete's tuning box....
Or, the Custom Code remap. IIRC, a Delhi member got it done.
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