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Old 16th May 2011, 10:33   #1
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Default CNG in automatic transmission

Greetings !

With many threads on CNG, I could not trace one on Auto transmission cars. Mods: Feel free to merge in case a thread is existing

The vehicle in question is I10 Kappa(1) Magna AT.

Is there anyone who has a converted CNG (AT) or knowledge for it? I had a discussion with one of the CNG fitment centers (Deep Hyundai, Wazirpur) and according to them, an AT can only be fitted with sequential CNG kits else a vacuum is created in brakes which result in them being ineffective, true?

Are there ppl here with their ATís converted to CNG? If yes, pls. share your install and experiences.

Tarun
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Old 16th May 2011, 10:56   #2
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Default Re: CNG in automatic transmission

i have not had any experience of it. But i have indeed seen several AT cars on CNG. Everything from a 1988 Toyota Corona to an Accord. And they were running the normal closed loop kit.
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Old 16th May 2011, 10:57   #3
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Default Re: CNG in automatic transmission

Quote:
Originally Posted by Tarun View Post
Greetings !

With many threads on CNG, I could not trace one on Auto transmission cars. Mods: Feel free to merge in case a thread is existing

The vehicle in question is I10 Kappa(1) Magna AT.

Is there anyone who has a converted CNG (AT) or knowledge for it? I had a discussion with one of the CNG fitment centers (Deep Hyundai, Wazirpur) and according to them, an AT can only be fitted with sequential CNG kits else a vacuum is created in brakes which result in them being ineffective, true?

Are there ppl here with their AT’s converted to CNG? If yes, pls. share your install and experiences.

Tarun
I am not able to see the reason how CNG conversion would differ between a manual and auto. Technically there should not be any difference since between manual vs auto, engine air/ fuel intake, brakes etc are same, no? Manual vs auto difference comes into picture when the power needs to be transferred from crankshaft to wheels but then at that point onwards, petrol vs cng should not matter. Will like to hear more from fellow members.

Tarun - I suggest you also take another opinion from specialized CNG fitters. I think they would do a much better job than HASS due to their specialization on this. Heck, HASS's are sometimes not able to fix issues with normal petrols so I would definitely go to a reputed, reliable CNG kit specialist. Anyways, warranty (if any left) will be void with CNG, so no point spending time with HASS.

Note - I do not have experience in CNG conversion, so would be glad to learn more if what I mentioned above is incorect.

Last edited by amit1234singla : 16th May 2011 at 11:01.
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Old 16th May 2011, 12:30   #4
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Default Re: CNG in automatic transmission

Hi Tarun,

Nice discussion you have started. Have gone through quite a few threads on CNG conversion and review. However all of them are dated.

It would be nice to have experts comments on the current CNG kits available, there costing and the their recomendations on the kit to be used.

I am also planning to book a Automatic vehicle in this week (contemplating between New Verna and Vento). Also plan to have a CNG kit installed in the same.
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Old 16th May 2011, 23:20   #5
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Default Re: CNG in automatic transmission

It is better to go for sequential CNG kit for new generation cars. It will give you piece of mind. I have used normal and sequential kits. Sequential kits are trouble free and will give you long term reliability and slightly higher mileage.
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Old 17th May 2011, 09:34   #6
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Default Re: CNG in automatic transmission

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Originally Posted by nvluv View Post
I am also planning to book a Automatic vehicle in this week (contemplating between New Verna and Vento). Also plan to have a CNG kit installed in the same.
Verna Automatic is available only in Diesel. Guess you won't save much if you convert a diesel to CNG.
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Old 17th May 2011, 09:44   #7
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Default Re: CNG in automatic transmission

It will definately work flawlessly, but it would be recommended with sequential kit only. As non-sequential kits would not be able to cope up with car's power and AT transmission.
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Old 17th May 2011, 09:52   #8
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Default Re: CNG in automatic transmission

For what little knowledge I have of gearboxes and engines. What fuel runs the engine does not affect the gearbox. Bigger or smaller due to the torque generated yes but a direct relation with everything else being constant is surely a straight fit.
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Old 17th May 2011, 12:11   #9
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Default Re: CNG in automatic transmission

Quote:
Originally Posted by johnjojo08 View Post
It is better to go for sequential CNG kit for new generation cars. It will give you piece of mind. I have used normal and sequential kits. Sequential kits are trouble free and will give you long term reliability and slightly higher mileage.
Does this means that 'Lamda' can be avoided?
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Old 17th May 2011, 20:55   #10
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Default Re: CNG in automatic transmission

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Originally Posted by jinojohnt View Post
Verna Automatic is available only in Diesel. Guess you won't save much if you convert a diesel to CNG.
i guess verna AT is available in petrol also, however have firmed up on vento petrol auto.
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Old 17th May 2011, 22:16   #11
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Default Re: CNG in automatic transmission

Hi,
Engine power/ torque affected adversely. So shift points might need changing, esp for light loads.

Regards
Sutripta
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Old 17th May 2011, 23:31   #12
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Default Re: CNG in automatic transmission

Quote:
Originally Posted by vijay_rodie View Post
Does this means that 'Lamda' can be avoided?
Sequential kit has seperate ECU.. That will take care of everything.. I am using STAG 200 kit in my ford ikon 1.6 which is running absolutly trouble free for last 7 months. Done around 10k with this kit. Check out the following link for more information ..

AC Spů
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Old 17th May 2011, 23:49   #13
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Default Re: CNG in automatic transmission

Don't see a problem. Just need to make sure the 2 ECUs can communicate effectively. (connectors and software)

Quote:
Originally Posted by Tarun View Post
an AT can only be fitted with sequential CNG kits else a vacuum is created in brakes which result in them being ineffective, true?
Sounds like nonsense. No relationship between vacuum and sequential injection.
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Old 18th May 2011, 00:02   #14
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Default Re: CNG in automatic transmission

I have seen an SX4 (Auto) at Apra Motors MASS, with CNG retrofitted from an independent installer, The owner was happy but he was using the more expensive Best Prins kit. Which come with its on ECU.

http://www.bestprins.com/
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Old 18th May 2011, 02:26   #15
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Default Re: CNG in automatic transmission

Quote:
Originally Posted by Tarun View Post
an AT can only be fitted with sequential CNG kits else a vacuum is created in brakes which result in them being ineffective, true?
I have seen at least 5ATs(OHC,Corollas and an Accord) on simple closed loop CNG kits.

The only brake interlock that I see in an auto(which is not there in a manual) is that the brake needs to be pressed before you can shift from P to any other position ; and this interlock has nothing to do with the fuel used.
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