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Old 4th June 2015, 19:46   #31
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

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Originally Posted by SPIKE ARRESTOR View Post
EGR apart from the known reasons, some of them mentioned above , is also used for thermal dethrottling. Efficiency improves with this.

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What is thermal de throttling and why or how does it improve efficiency? Could you please explain, never heard of it before.
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Hi, Even I would like to know what thermal de throttling is, and why or how does it improve efficiency?
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Old 9th June 2015, 07:47   #32
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

Come on bhpians. The internet is not helpful when i search for thermal de-throttling.

First they say EGR works only at part throttle and now this 'thermal dethrottling' comes.

What does the term mean? Bringing down the rpm by using the hot gases from the EGR?
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Old 9th June 2015, 09:09   #33
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

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Come on bhpians. The internet is not helpful when i search for thermal de-throttling.
http://www.amazon.in/Handbook-Engine.../dp/3540890823

See if you can find the PDF of this book.
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Old 9th June 2015, 17:37   #34
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

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Originally Posted by Sankar View Post
http://www.amazon.in/Handbook-Engine.../dp/3540890823

See if you can find the PDF of this book.
Heh. Google books lists only the alternative pages of this book and the 'thermal dethrottling' comes in the unlisted page.

So here's what i was able to get from a brief surfing through forums:

EGR helps to reduce the swept volume- exhaust gases are inert since they can't combust again, so when a % of it being fed in, voila, your 1.5 litre turbodiesel becomes 1.3 or so, FE goes up.

It's like, em, taking in a 25% of our own 'inert stuff' such that we feel full at 75% of the actual calorie input. Remember that the feeling of fullness is what matters in dieting, so our actual consumption goes down but the blood becomes dirty soon and the kidneys have to work overtime.

And all these modern diesels with EGR have reduced sump capacities, extended oil change intervals- it should have been the reverse, right? Beats me.
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Old 9th June 2015, 18:10   #35
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

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Heh. Google books lists only the alternative pages of this book and the 'thermal dethrottling' comes in the unlisted page.
You didn't look hard enough Anyway here's the relevant section from the PDF.
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If you like automotive Diesel engines Bosch books are great! Wish i could procure a few more. Expensive but worth it.
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Old 9th June 2015, 21:19   #36
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

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If you like automotive Diesel engines Bosch books are great! Wish i could procure a few more. Expensive but worth it.
True, though this does not fall in the blue jacket/ yellow jacket category.
Any Springer publication is, for us Indians, eyewateringly expensive. The normal bluejackets are not that expensive.

Now if someone could explain to me the whole concept of throttling (and dethrottling) diesels.

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Old 9th June 2015, 22:20   #37
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

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Originally Posted by Sutripta View Post
True, though this does not fall in the blue jacket/ yellow jacket category.
Any Springer publication is, for us Indians, eyewateringly expensive. The normal bluejackets are not that expensive.
The other Bosch book i have is Diesel Engine Management 4th Edition by Wiley and its three times less expensive than this Springer. Are blue/yellow jackets supposed to be more expensive?
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Old 9th June 2015, 22:29   #38
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

^^^
The Blue jackets are the normal general purpose books. useful for people like us. Normally there are two publishers for English: Wiley for Europe, Bentley publishers for US. Cost as you know.
The Yellow jackets are essentially technicians references. Much cheaper than the blue jackets, but very specialised (and thus limited) in scope. And not really for us.
Springer versions are essentially for library reference.

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Old 16th June 2015, 10:45   #39
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

Hi,

I recently bought a 2009 Automatic Scorpio with a MHawk Engine. Initially I was not quite happy with the pickup of the vehicle as at times it just lagged. My mechanic did a Jugad of inserting a small plastic piece in the EGR vacuum tube and blocking it and again fitting it to the EGR valve. I noticed a significant change in the pickup after the Jugad. In a pursuit to understand what exactly he did I landed on this thread.
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Old 5th December 2015, 23:19   #40
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

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Originally Posted by sugathan View Post
Interestingly, the new Thar DIs come with an EGR ECU. (not sure when this was introduced though!) So I suppose, in the new models, one will not have a need to block, the ECU will be handling better than the non ECU method.
Will blocking of the ECU for the EGRin the newThar DI with PS ,give better low end grunt and more efficiency at higher speeds ,when compared with the older Thar DI.Can the ECU and the EGR be removed,without a complicated job,in the DI,and if yes, would it make it a better engine
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Old 6th December 2015, 11:24   #41
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

In the CRDE Thar, there is a vaccum hose from the alternator to a small electronic unit next to the Battery. From this unit there are two outlet tubes, one is to the brake booster reservoir and another to the EGR vaccum switch.

I have just disconnected the vaccum tube from the Electronic unit to the EGR Vaccum switch.
My main observation is that there is more black smoke under heavy acceleration.

Can anyone comment if this will indeed disable the EGR?
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Old 7th December 2015, 18:53   #42
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

Well I have now tested my handiwork for a day and can emphatically say the Thar drives MUCH better.

Boost comes earlier and is more sustained, gear changes are less frequent, engine note is much smoother.

The possible drawbacks I have observed are more smoke under heavy acceleration, higher gas consumption and I feel the engine is running slightly hotter.

BTW I do use a tuning box.
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Old 19th December 2015, 15:10   #43
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Default Re: DIY: How to Block the EGR Valve on a Turbo DI

I have also blocked the vacuum inlet to the EGR valve and see a difference in the behavior of my thar, it actually drives better, but i suppose this new EGR-ECU is a little more complicated, I see that the ECU ties the EGR Valve and the FIP. I see a sensor on the EGR valve and the FIP. It could probably be as simple as the sensor finds the EGR valve state (open or close) and alter the fuel input to the pump, but i suppose it would be good if someone can actually explain how these actually function.
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