Quote:
Originally Posted by harjeev Hey guys
I recently got CNG installed in my 2004 Chevy Optra 1.6.
I am been amazed by the sheer savings in the cost of fuel and now I think that why dint I get this done earlier. The kit has been endorsed on the RC and the Kit is Tomascetto (I think, but ill check it on the kit itself and reconfirm) The bill says "BRC includes ...." Is BRC and Tomascetto the same thing?? The cylinder is 14kgs NCL make. I paid a total of 31k which includes everything, including the endorsement on the RC, though government authorised installer and not a GM workshop. i din't even ask as my vehicle was more than 6 years old there was no warranty to loose!!!
Post installation the vehicle is great to drive and under normal driving we don't even notice the decrease in the pickup, but naturally when trying to rev her hard there's a lag, but hey I am not complaining as long as I am saving the moolah. They've put several items in the vehicle, Ive attached a copy of the bill).
I start the vehicle normally and it always starts in Petrol. there's not switch to convert from Petrol to CNG. After warming her up (once in the morning) I just have to rev her up, greater than 3000 RPM and its switches to CNG automatically. Incase the CNG finishes we just have to press 1 switch and the vehicle runs on petrol. Its that simple!!!
I just got the kit installed about 10 days back, so now my queries - The cylinder is 14kgs and the shop owner told me that we would be able to fill about 10-12 kgs of gas, but the max that I've been able to fill is 8.50kgs and that too when the cylinder was completely empty.
- As the vehicle runs daily for 90-100kms weekdays mostly, this (8.5kgs of gas) creates an issue. I think I am averaging about 12-13kms /kg approx so this gives me a range of only 100-110kms. which means that I have to send the vehicle to the filling station everyday. I've also got the cylinder checked and it has 65L engraved on it which someone told me comes on a 14kg cylinders.
- Also I've changed the valve on the cylinder to a bigger one but no resolve. Please advise/ comment
- I read somewhere that in the GM supplied kit they change the rear springs to manage the extra weight. Where do I get that done and how much should it cost (parts/ labor)?
- I wish to get a IInd opinion on the installation. Can anyone recommend an installer, who wouldn't mind giving me unbiased advise!! Really need it!!!
Thanks & Cheers Enclosed a scanned copy of the Invoice |
Harjeev, I too have converted to CNG recently. I'm running an Alto BS3 with a Lovato kit with TAP. It's been installed as an open loop (without the lambda control system). Now regarding to your queries:
1. A cylinder is always measured in water capacity. Yours is 65 ltrs and generally at around 190-200 bar you should be able to get around 8.5 kgs when empty. I too have a 65 ltr tank by Lizer
2. Generally the average improves by 40%-45% over a Petrol. I used to get 17kmpl on petrol so I get 25 km per kg on my Alto. I think your mileage of around 13 is good. If you are running a closed loop system, then your mileage might improve further marginally. Ensure you have installed the timing advancer, that way you should not feel much performance drop
3. No clue on the valve of the cylinder. IMHO, please use the one which came with the kit.
4. Personally looking that the way the installer wrote the memo, I'm getting a feeling you could have found better installers than this. I cannot help you since I'm in Mumbai, but several others on this forum should be able go guide you.
Some tips IMHO:
1. Ensure your spark plugs are clean and properly gapped.
2. Clean your air filter frequently (say every 2000 kms)
3. Don't accelerate hard with CNG at low RPM. Low end torque is reduced when you run on CNG.
4. If possible, change to a marginally thicker grade of engine oil. I am currently running 20w-40, and planning to move to 20w-50 castrol GTX. go semi-synth if possible. |