Performance Mods for CNG Cars

Gangsta · 7th February 2009, 19:38

Quote:

Originally Posted by abhik

Sorry bro! But i did read what you wrote about it was just a friendly reminder/suggestion, thats it, not comments!

No issues bro. Chill and Cheers

Quote:

Originally Posted by arsenik

hey guys... reading the whole thread, really made me think!! i wanna get CNG on my swift too!!!

mine is givin a poor FE of 9kmpl... so m doomed~~!!!
any idea how much a CNG kit would cost???

CNG kit with 12 kg cyl for swift will cost you around 35-37k that's the price for delhi.

abhik · 7th February 2009, 20:47

Any updates on the roll-on tests you planned?

Gangsta · 7th February 2009, 20:57

Quote:

Originally Posted by abhik

Any updates on the roll-on tests you planned?

nah! i havnt been to expressway since then. may be tomorrow or upcoming week.

Gangsta · 12th February 2009, 19:47

Still havnt been to expressway. lol

Now i have TAP + Lambda , getting very good performance. but wanna increase the performance more..

any more suggestions?

ashthedivx · 12th February 2009, 20:10

Quote:

Originally Posted by Gangsta

Still havnt been to expressway. lol

Now i have TAP + Lambda , getting very good performance. but wanna increase the performance more..

any more suggestions?

Get a Stock Replacement K&N Filter... Got one, its worth every penny !!

Gangsta · 12th February 2009, 21:35

Quote:

Originally Posted by ashthedivx

Get a Stock Replacement K&N Filter... Got one, its worth every penny !!

what difference u felt?

ashthedivx · 12th February 2009, 21:41

Well car is breathing much better then that of before. Gears are much more responsive !!

By the way guys, anyone know one who has installed cng on automatic cars ??

Gangsta · 12th February 2009, 22:09

Quote:

Originally Posted by ashthedivx

Well car is breathing much better then that of before. Gears are much more responsive !!

By the way guys, anyone know one who has installed cng on automatic cars ??

I heard that automatic cars do face problems sometimes and it needs a good tuner. Bad tuning will result in a lot of damage.

ashthedivx · 13th February 2009, 10:47

Quote:

Originally Posted by Gangsta

I heard that automatic cars do face problems sometimes and it needs a good tuner. Bad tuning will result in a lot of damage.

How come a bad tuning can cause damage... it may decrease performance or spoil driving fun.. but no way it can cause damage. I have seen crvs running on CNG, so it should not be a problem theoretically.

A friend was interested in shifting his automatic Civic to CNG !!

ask77 · 13th February 2009, 12:22

Quote:

Originally Posted by ashthedivx

Get a Stock Replacement K&N Filter... Got one, its worth every penny !!

how much did it cost ? You have a Optra is it 1.8 or 1.6

Gangsta · 14th February 2009, 02:31

Quote:

Originally Posted by ashthedivx

How come a bad tuning can cause damage... it may decrease performance or spoil driving fun.. but no way it can cause damage. I have seen crvs running on CNG, so it should not be a problem theoretically.

A friend was interested in shifting his automatic Civic to CNG !!

i said i heard in a forum abt issues but no technical reasons mentioned there too.

ashthedivx · 14th February 2009, 09:49

Quote:

Originally Posted by ask77

how much did it cost ? You have a Optra is it 1.8 or 1.6

Mine Optra is 1.6 Lt one.

Mpower · 14th February 2009, 22:05

Has anybody tried increasing compression ratio in CNG/LPG cars to benefit from higher octane rating?

We got a wagonR DUO recently and I'd like to try this on my car.

Also would like to know if it has an in-built TAP or do I need one?

abhik · 15th February 2009, 00:18

Quote:

Originally Posted by Mpower

Has anybody tried increasing compression ratio in CNG/LPG cars to benefit from higher octane rating?

We got a wagonR DUO recently and I'd like to try this on my car.

Also would like to know if it has an in-built TAP or do I need one?

I was thinking of the same and also planned to increase CR of the 1.6ROCAM i had. But the cost for the same was too much as it would involve change of pistons as thats the only way i think increasing CR would be possible along with change of con-rods and reprofiled cams. I also thought about porting and polishing for the same.

For successfull performance gain from CNG the engine needs to be redesigned completely with higher CR like diesels and ECUs mapped accordingly and engine has to be built with a purpose of the main fuel being CNG, a piggyback/stand by mode in the ECU could handle petrol running.
Unfortunately CNG as fuel for automotive usage has not reached that stage as cost of production for a dedicated engine for CNG would be very high as a separate line would have to be made for production of these engine along with petrol and diesel counterparts.

I doubt that the DUO would have a TAP. It usually is an aftermarket fitment, it does'nt come with CNG kits.

@ashish - For an auto tranny the only doubt i have is the idling and rpm fluctuation problems especially if its a CVT since most fuctions of the ECU are eliminated once switched to CNG mode and Lamda would only control AFR. So i dont know how switching of gears and Throttle Position sensing would be regulated for the tranny.

Just my two cents.

Mpower · 15th February 2009, 07:23

Quote:

Originally Posted by abhik

I was thinking of the same and also planned to increase CR of the 1.6ROCAM i had. But the cost for the same was too much as it would involve change of pistons as thats the only way i think increasing CR would be possible along with change of con-rods and reprofiled cams.

Theres no need for pistons or conrods. All you need to pulll the cylinder head and get it machined and put back. Should be done within 2 grand.

7th February 2009, 20:47	#197
abhik BHPian Join Date: Aug 2007 Location: New Delhi Posts: 848 Thanked: 12 Times View My Garage	Any updates on the roll-on tests you planned?
	() Thanks

12th February 2009, 19:47	#199
Gangsta BHPian Join Date: Jan 2008 Location: New Delhi Posts: 624 Thanked: 20 Times	Still havnt been to expressway. lol Now i have TAP + Lambda , getting very good performance. but wanna increase the performance more.. any more suggestions?
	() Thanks

12th February 2009, 21:41	#202
ashthedivx Senior - BHPian Join Date: Feb 2007 Location: Delhi Posts: 1,356 Thanked: 24 Times	Well car is breathing much better then that of before. Gears are much more responsive !! By the way guys, anyone know one who has installed cng on automatic cars ?? Last edited by ashthedivx : 12th February 2009 at 21:43. Reason: adding comment
	() Thanks

14th February 2009, 22:05	#208
Mpower Senior - BHPian Join Date: Mar 2005 Location: Bangalore Posts: 10,409 Thanked: 1,729 Times View My Garage	Has anybody tried increasing compression ratio in CNG/LPG cars to benefit from higher octane rating? We got a wagonR DUO recently and I'd like to try this on my car. Also would like to know if it has an in-built TAP or do I need one?
	() Thanks

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