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Old 7th May 2009, 11:40   #1
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Lightbulb Understanding Toyota Innova D4D Technicals Better

Innova is a No-Problem Vehicle but then this thread is intended to query, share and explore Toyota Innova D4D Technicals.

Let me start off with a barrage of questions on the Toyota Innova D4D:
  1. Does Innova G1 Single Blower and G4/V Double blower has different capacity AC Compressors? (The Condensor Unit is twin I Know, but I believe the AC Compressor is same capacityin both variants)
  2. Is the ECM programmed to behave as per the ODO mileage? (I mean during run-in it will behave in some way and once it crosses 50K or 1 Lakh kms it will behave another way)
  3. Is the D4D Engine really so detuned as to give it a long life? What all is done for the de-tuning? How does pete help then?
  4. Why does the vehicle cruise @ 80 kmph on overdrive @ 2000 rpm. other vehicles like safari do 100+ kmph at that speed. Is it for the optimum torque or is it for limiting top speed?
  5. How well does a D4D Crdi perform in high altitude?
  6. Why does the D4D does not have a separate intercooler?
  7. What rpm range is the Turbo Pull precisely? (I have experienced between 2000-2400 rpm)
  8. Does the Turbo Pull absence happens in D4D (Like it has been seen in the swift)
  9. Why is the D4D engine NVH so harsh whereas engines of ford fiesta, Swift sound so tame? What did they do to make it silent? And does sounding rough and crude ensures long engine life?
  10. Does the K&N Filter make a great difference in D4D? (Mine did not, so rolled back)
  11. What is the ARAI standard mileage certification for D4D? Is 80 kmph or 100 kmph the max efficiency speed?
  12. What all protection is inbuilt in the Innova for driving in waterlogged areas (and also parked in water logged areas upto the door sill level)?
  13. Why is the paint quality so bad in the Innova? How much should it cost to repaint it entirely?
  14. Also share other ownership issues (Technical snags, if any) and add to the list.
  15. Does the fuel efficiency reduce drastically id one uses 225/60/R15 tyres instead of 205/65/R15? Is that the reason the company recommends thinner tyres?
Better some guy from TKMPL answers these.

Last edited by btirthankar : 7th May 2009 at 11:44.
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Old 7th May 2009, 12:00   #2
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Originally Posted by btirthankar View Post
What all protection is inbuilt in the Innova for driving in waterlogged areas (and also parked in water logged areas upto the door sill level)?
BT, you seem to have started preparations for the Kolkata monsoons already, I see. No car (except this) likes water, whether Toyotas or Marutis.
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Why is the paint quality so bad in the Innova? How much should it cost to repaint it entirely?
Repaint your Innova entirely? Are you serious? No way...
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Old 7th May 2009, 12:12   #3
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BT, you seem to have started preparations for the Kolkata monsoons already, I see. No car (except this) likes water, whether Toyotas or Marutis.

Repaint your Innova entirely? Are you serious? No way...
Yeah True. The Dealership says, its water protected and was explaining how better it is protected in comparison to the corollas. Cant buy his words still.
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Old 7th May 2009, 14:19   #4
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@bt: How well does a D4D Crdi perform in high altitude?

From my personal experience, very well. I have done the Shimla, Kinnaur, Spiti, Rohtang loop in my innova V in 2007 with exactly zero issues. Met another family driving an innova on the journey and they continued onto ladakh and came out via kashmir.

The only thing I would say is that the second gear is quite weak on very steep slopes.

On the entire trip, there was only one road I could not make it up, ironically a well tarred but very steep back road to a hotel in Kalpa. Had to stop the car and then it just kept rolling back even in first. Had to put stones to stop the slide and then slowly reversed down. (To be fair, the hotel management had recommended that road for jeeps only but I had to try )
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Old 24th January 2010, 22:00   #5
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On the entire trip, there was only one road I could not make it up, ironically a well tarred but very steep back road to a hotel in Kalpa. Had to stop the car and then it just kept rolling back even in first. Had to put stones to stop the slide and then slowly reversed down. (To be fair, the hotel management had recommended that road for jeeps only but I had to try )
I can understand. Well in most of my hill trips like Darjeeling, Jog Falls and Kasauli it did fairly well. Maybe very steep slopes are an exception.

But what about the rest of the queries I posted, anyone?
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Old 24th January 2010, 22:47   #6
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Quote:
Originally Posted by btirthankar;1292307this thread is intended to [I
query, share and explore[/i] Toyota Innova D4D Technicals.

Let me start off with a barrage of questions on the Toyota Innova D4D:
  1. Does Innova G1 Single Blower and G4/V Double blower has different capacity AC Compressors? (The Condensor Unit is twin I Know, but I believe the AC Compressor is same capacityin both variants)
  2. Is the D4D Engine really so detuned as to give it a long life? What all is done for the de-tuning? How does pete help then?
  3. Why does the vehicle cruise @ 80 kmph on overdrive @ 2000 rpm. other vehicles like safari do 100+ kmph at that speed. Is it for the optimum torque or is it for limiting top speed?
  4. Why does the D4D does not have a separate intercooler?
  5. Why is the D4D engine NVH so harsh whereas engines of ford fiesta, Swift sound so tame? What did they do to make it silent? And does sounding rough and crude ensures long engine life?
  6. What all protection is inbuilt in the Innova for driving in waterlogged areas (and also parked in water logged areas upto the door sill level)?
  7. Why is the paint quality so bad in the Innova? How much should it cost to repaint it entirely?
I am not an expert neither do I work for Toyota.

1) Very long back I read in TBHP that the higher version has a higher capacity compressor. Cant trace that post now.

2) Pete will cheat the ECU so that more fuel goes in. This is how Pete works. When you install Pete unit, it misinforms ECU, hence more fuel is pumped in.

3) It has to do with gearing. Optimum gear ratios are set. Baleno does 34 kmph/1000 rpm in top gear. Swift petrol with G13 ( 1.3 ) unit was higher than this. G3HC i.e. ANHC has 33.X kmph/1000 rpm. Safari 3.0 was around 50 or 52 kmph/1000 rpm. The torque and power curves of engine dictate this.

4) IIRC, NO. But it is rumored that for Euro 4 norms, Intecooler will be added.

5) An engine sounding rough and crude does not extent its engine life.

6) I am interested in knowing this. I have seen Innova wading in water upto headlights and coming out clean. For that matter even M800 will clear water if its not above M800 headlights.

7) The could be like that for cost cutting purpose.
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Old 7th May 2012, 11:57   #7
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Default Re: Understanding Toyota Innova D4D Technicals Better

Both the Innova and the Fortuner has the gear levers vibrating continuously.

Can we collectively find a solution to this? The dealer mentions this is due to high torque but I disagree because perkins forklifts or volvo bus engines have much higher torques but their gears never shake/vibrate.

The shaking of the gears is also evident each time you release the clutch.

Please suggest.
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Old 7th May 2012, 12:09   #8
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Default Re: Understanding Toyota Innova D4D Technicals Better

Quote:
Originally Posted by nitinbose View Post
Both the Innova and the Fortuner has the gear levers vibrating continuously.
The shaking of the gears is also evident each time you release the clutch.

Please suggest.
This is due to the gear shift lever being mounted directly onto the gearbox below. There are no linkages or cable involved to isolate the vibrations, hence that is why they vibrate.

There is nothing that can be done to reduce this.
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Old 7th May 2012, 12:51   #9
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Default Re: Understanding Toyota Innova D4D Technicals Better

Why is the gear shift lever mounted this way? Any specific reasons / advantages? I have only seen this with Innova & Fortuner. All other diesel have no such vibrations.

regards,

Nitin
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Old 7th May 2012, 21:31   #10
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Default Re: Understanding Toyota Innova D4D Technicals Better

One reason could be to reduce complexity and hence the cost, the shift feeling is more direct too.

The Qualis too had the same issue of the gear lever vibrating around, in the Innova its bit lesser.
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Old 7th May 2012, 22:12   #11
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Default Re: Understanding Toyota Innova D4D Technicals Better

Quote:
Originally Posted by nitinbose View Post
Both the Innova and the Fortuner has the gear levers vibrating continuously.

Can we collectively find a solution to this? The dealer mentions this is due to high torque but I disagree because perkins forklifts or volvo bus engines have much higher torques but their gears never shake/vibrate.

The shaking of the gears is also evident each time you release the clutch.

Please suggest.
The gear lever in the Swift/Ritz DDiS also shakes but only 3rd gear. The movement is little not noticeable to the naked eye but felt only while placing your palm on the lever. MASS say this is happening because of the high torque developed by the engine and to prevent damage to the gear box the play is given.

Lets not get diverted and stick to Innova and its technical details.
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Old 8th May 2012, 08:48   #12
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Default Re: Understanding Toyota Innova D4D Technicals Better

Quote:
Originally Posted by a4anurag View Post
The gear lever in the Swift/Ritz DDiS also shakes but only 3rd gear. The movement is little not noticeable to the naked eye but felt only while placing your palm on the lever. MASS say this is happening because of the high torque developed by the engine and to prevent damage to the gear box the play is given.

Lets not get diverted and stick to Innova and its technical details.
If you have driven the toyota hilux Vigo,you wouldnt complain,considering the fortuner shares the same platform.
By the way,if anyone has noticed,the new innovas dont sport the D-4D tag,its only plane intercooler,any specific reason for this?
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Old 8th May 2012, 09:22   #13
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Default Re: Understanding Toyota Innova D4D Technicals Better

Quote:
Originally Posted by nirmaljusdoit View Post
One reason could be to reduce complexity and hence the cost, the shift feeling is more direct too.

The Qualis too had the same issue of the gear lever vibrating around, in the Innova its bit lesser.

Dont all cars have their gear levers linked directly to the gear box, as I've always felt the gear box to be directly under the stick.
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Old 20th October 2013, 16:50   #14
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Default Re: Understanding Toyota Innova D4D Technicals Better

Hello all !

Has the Innova always had a DOHC 16 valve D-4D diesel engine ? Or was in introduced with an SOHC 8 valve diesel engine and at some point has migrated over to the 16 valve version ?

Wikipedia seems to suggest that it has always been 16 valve.

Cheers,

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Old 20th October 2013, 17:05   #15
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Default Re: Understanding Toyota Innova D4D Technicals Better

Quote:
Originally Posted by genesis View Post
On the entire trip, there was only one road I could not make it up, ironically a well tarred but very steep back road to a hotel in Kalpa. Had to stop the car and then it just kept rolling back even in first. Had to put stones to stop the slide and then slowly reversed down. (To be fair, the hotel management had recommended that road for jeeps only but I had to try )
I guess you are talking about Hotel Rakpa Regency in Kalpa.
It sure is a very steep drive up to the parking of the Hotel. I was there in a Scorpio, and I did roll back in the first attempt. From then on with high revs and the clutch released at high revs the Scorpio managed to get to the parking. The Swifts etc were climbing up the steep incline with ease.
I guess the Innova should also be able to climb up with high revs.

I am attaching a picture of the Parking of Rakpa Regency. You can see my Scorpio along with smaller cars parked there. The steep path is on the right bottom.

Styler
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