Flash319

You can put a bigger coil on the stock ignition this is why I see no advantage to a Jacobs box.

76ANTHONY

what kind of coil would work? id like to upgrade my coil.?

chubbydude

Any chance you would be willing to take a few pictures of your LPG setup, and see who the manufacturer of the kit you got.? Is the v6 full sequential, half sequential and non sequential fuel injection? You have the first 3vz-e that I have heard of with LPG and it would be interesting to note your impressions of performance and mileage etc. I guess performance is not a huge deal, since you can switch back to gas or some kits let you run duel fuel at the same time. Since propane runs hotter I was thinking, it would not be good for the no6 cylinder and gasket. I am not a 3.slow basher, in my case it has been a fantastic engine and still going strong. Thanks in advance.

truckarms

Hi,
I can take some pictures but dont have any at the moment. It will be after the weekend.

I have a Vogas SGi 6 Cylinder Sequential Lpg Autogas Injection Kit
Its on this guys web site http://www.wtv-uk.co.uk/
It is ok, I now have done a load of research in the 2.5years I have had the kit and would probably recormend a prins sequential injector kit. (and I probably would not buy from him again if I had a choice but that is mainly a geopgraphical issue)

The injectors mimic the petrol injectors so fit at the same time as your petrol ones would have fired (you have to splice the lpg wiring in between the petrol injector wires that way it uses the signal that would have gone to the petrol injectors and diverts it to the lpg injectors). Dont worry its not hard to do and the fail safe in the system means that the petrol injectors will always work if something blows in the lpg ecu.

The v6 engine is none sequential so all injectors fire all the time, it just changes how fast they fire depending on your acceleration. You need a petrol car that is fully sequential to gain the most benifit from this system.

Once you have it all hooked up you can still program how much fuel is deliverred etc so there is some tuning you can do.

Power wise you only lose a very small bit of power, to be honest its not noticeable (if everything is working well)

The main problem comes with the fact that my car is 14 years old and the electrics are old and tired. So any slight problem with the engine ignition which probably was undetectable on petrol is multiplied by 50 on lpg!!! For example I had a tiny missfire on petrol, I did not even notice it, no drop in fuel economy or anything but after seeing a specialist you could just notice it if you knew what you were looking for. But on LPG I was running on 5 cyclinders and it was terrible.

Yes LPG runs a little hotter so in 30 degC (sorry cant convert that to F) after you drive down a road for an hour at 80/85mph the fan is screaming at you. but otherwise its fine.

Flash319

Any 12V ignition coil will work you will just have to look for one with what I mentioned before. Highest voltage you can get with the lowest primary resistance. Accel and Malory(sp) come to mind. They have been around for a long time so I would trust them. Jacobs just sells coils too.

chubbydude

Hi, Thanks for the good info. Any particular reason for recommending the Prins VSI-LPG system. Are their injectors or ECU better or something? I am not sure the Prins would work with non-sequential engines.

I was looking at the kit below, as it will run sequential or not. Since LPG is less than half the price of gas and diesel, I am giving LPG serious thought. It does go up a bit in the winter. LPG "may" also stay cheap as the politics and perception of LPG has not made it popular at all.

http://www.poweredbypropane.net/

truckarms

Prins have been around for a long time and at least in the uk are very well respected. I think if you are planning a self install they are also one of the best as the software is cheap and easy to get hold of.

But saying that now most of the kits are fairly similar and the one you showed looks fine. just about all kits will work on none sequential cars, as I said before the 4runners are none sequential, i.e. all your injectors fire at the same time so you get 6 injector shots per engine rotation (from each injector) the great thiong with using indervidual injectors as it allows you to fully program your engine fuel to air mixtures (hence the need for the software). Just dont get a system which mixes in the air inlet, they are out dated and prone to back fires which in our cars will destroy your maf sensor thing.

As for cost etc, the other thing to remember with LPG is that it burns very nicely and produces only h2o and co2 which is better than diesel and petrol which have addatives in them. Another good point about lpg is that is it a natural by product of the production of petrol and diesel, its just a lighter feul so comes off first in the process and currently is not used world wide to its full potential and therefore gets wasted so we may not be imporving the enviroment by using it but we and definately not doing as much damage as petrol cars! Thats my opinion anyway, I am sure someone will fire me down about that.

Flash319

LPG has about 35% less energy per volume compaired to gas and diesel. You will burn a lot more and not go as far on a tank. The price may justify this (it did 10-15 years ago)but I have burned it in many trucks and I hated it. No power and you stop at every fuel station that sells it.

truckarms

LPG is only about 20% less efficient than petrol (but that does not actually equate to 20% less milage, I recon on 10% less milage with general driving). Not where near 35%. Yes if you just use a mixer you lose power when you convert to lpg but with direct injection and the fact that this is fully programable you dont lose much if any power. (I recon 5% power loss and thats only really noticable with 35" tyres and on hills!)

To compensate for the slightly less range you would get I have a larger tank, infact I have a 90ltr tank where the under slung spare tyre goes so actually go further on lpg than I can on petrol for half the cost!

I would agree that the really old systems were not very good but the modern new ones are much better. In fact on new car conversions I know guys who recon the car runs better on lpg than on petrol (mainly due to how the lpg has been programed for that indervidual car and not mass programed like a stanadrd car ecu is).

taikowaza

word from my electronics guru-

"Sounds like he wired it incorrectly or the box has a short. That would be the only reason why it would blow a fuse: that instead of 12v its grounding out. Its hard to diagnose without being there but definitely something of those two. Or, he tied couple wires together......"

jeetS

My truck came with a jacobs system...86 22rte

Today I unplugged the blue lead at the factory coil to crank it without actually starting it...and it still started and ran fine! This is without the factory coil sending a signal to the jacobs unit......Im very confused....

Im trying to source a slight misfire....

Can somebody explain to me how the system works?