Author Topic: petrol to diesel conversions - is it possible?  (Read 3990 times)

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Taf

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petrol to diesel conversions - is it possible?
« on: January 08, 2013, 08:55:05 PM »
Hi all,

Just wondering if anyone knows if it is possible to convert my challenger 3Ltr V6 petrol to a diesel. While i love the car, She is just so damn thirsty. While i know its going to be expensive prospect to covert her to a diesel, I have put a lot of mods into this car and don't want to have to start modding another car . Any info would be gratefully received,

Cheers,

Taf

Cheiffy

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Re: petrol to diesel conversions - is it possible?
« Reply #1 on: January 08, 2013, 09:02:03 PM »
Mate, it would be cheaper selling yours and getting another. Diesel motors are quite often more expensive than the car they are sitting in. You will need modification certification, and I doubt any insurance company will go anywhere near insuring it for what you will be spending. Remember, you get what you pay for, go cheap on a diesel motor and you will pay for it again, and again, and again.

Simply not worth it IMHO

Cheers

Cheiffy

Taf

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Re: petrol to diesel conversions - is it possible?
« Reply #2 on: January 08, 2013, 09:16:51 PM »

Hi Cheiffy,

I was hoping that wasn't going to be the case. The challenger has every mod i could want on her, and has cost me a fortune in repairs for oil leaks. The trouble is I LIKE this car, but I just wish she was more fuel efficient. I would love to keep her for years to come , but not only is the fuel efficiency annoying me, but i am starting to note the advantages that I would have if a had a long wheel base as well.

Maybe i should consider a conversion to a more efficient engine instead

Thanks anyway for the reply

Taf

Offline Kris

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petrol to diesel conversions - is it possible?
« Reply #3 on: January 08, 2013, 09:18:24 PM »
Taf

If you like the car and want to keep it long term I don't think it is an unreasonable thought.

Yes insurance will be more difficult but not impossible if you keep it legal.

However consider what you are trying to achieve. If it is simply for economy then I doubt the cost will be worth it. The challenger I had was only getting 16 to 17 l per 100km.

Have you considered extractors? Snorkel on yours? Won't reduce it dramatically but may make it better Offroad?

Offline Kris

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petrol to diesel conversions - is it possible?
« Reply #4 on: January 08, 2013, 09:23:15 PM »
Taf

Also just for reference when I priced a replacement engine for my challenger - 2.5l CRD

$12k from wrecker
$20k + for a crate motor

If you are serious about doing a conversion you would want to find a complete car so you get the wiring and gearbox etc...

Kris

Taf

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Re: petrol to diesel conversions - is it possible?
« Reply #5 on: January 08, 2013, 09:29:51 PM »
Hi Kris,

Thanks for the reply.
I have the snorkel already and i did not notice any real difference in economy. I tried the K&N filters as well, and again, no real difference. I put a long range tank on her so i increased the fuel capacity from 70 to 125 litres, but i am still only getting around 500 Ks per tank. Its frustrating because i really o get that WOW factor when i look at her....but, as you know, challengers aren't the biggest vehicle out there, so between the fuel efficiency and lack of space, i am starting to have my doubts about her ...............if only she wasn't so damn pretty

Taf

Mr Mac GU

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petrol to diesel conversions - is it possible?
« Reply #6 on: January 08, 2013, 09:50:23 PM »
It would take 20 years or more to save the cost of the conversion in fuel savings. Just not worth it.

I have seen at Tjm slacks ck a wheel carrier with twin Jerry cans that is removable and mounts from your towbar.wasnt too dear and you could carry another 40lt for long trips. Probably a better investment.




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Taf

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Re: petrol to diesel conversions - is it possible?
« Reply #7 on: January 08, 2013, 10:16:30 PM »
Hi Mr Mac,
I already have one of those carriers. I only use it to carry water though as I was under the impression it is illegal to carry petrol on the back of the car.
Also, any conversion I do would not only be to save money on filling her up, it would also save me having to spend thousands re modding the next car.
Thanks for the reply.
Taf
« Last Edit: January 08, 2013, 10:26:53 PM by Taf »

Cheiffy

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Re: petrol to diesel conversions - is it possible?
« Reply #8 on: January 09, 2013, 06:31:59 AM »
Hi Taf,

I would suggest that you should go on your Cape trip before a conversion. You may find that the vehicle doesn't quite fit the bill. This is not a dig at your car, but after a few trips that are considerably longer and harder than the odd weekend, you may decide that a Toyota is the go. Ok that be have been a dig.

As for modifications, mate, it never stops. The Hilux is going on 10 years and I am still swapping and changing.

Cheers

Cheiffy

Offline deFuzster

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Re: petrol to diesel conversions - is it possible?
« Reply #9 on: January 09, 2013, 08:16:12 AM »
Hi Taf

I agree with the comments so far.

If the vehicle came out in a diesel version, it is still a major undertaking and costs lots of $.  :-\

If the vehicle didn't come out with a diesel version, then you have extra problems such as weight. A diesel is considerably heavier than the petrol motor so you will always have to have a custom suspension setup as mainstream suspension will be under rated. Then there is the brake upgrade for the extra weight and so on.  ::)

Even with if the vehicle came out with a diesel, there is more than just the motor, there is the entire fuel system (lines, pumps, filters, filler neck), clutch or torque converter, gearbox adapter or new box and the gear ratio's in your diff's and gearbox is usually different between petrol and diesel due to the different torque characteristics.  :(

I honestly think that it would be cheaper in the long run to replace the vehicle with a factory diesel of some sort. Your truck is a well kept, neat unit so I am sure that you would be able to get a good coin for it should you decide to go that way.  8)

As Cheiffy said, after a touring trip where you are living out of the vehicle for weeks on end you may find that a little more storage space would be desirable. Not to mention suspension travel and availability of parts in those iconic but remote tracks.  :-X

Now, having said all that, if you decide to keep it, there are benefits in keeping the petrol anyhow.

Yes, they can be more thirsty but with that you also have the power that burning all that fuel brings. And there are not many places where you can get diesel but not petrol (but they do exist). Just a little more planning when you are getting ready for the big trip is locating fuel spots and making sure you have enough juice to get between them.  :P

Perhaps to help out round town, you could look a gas conversion ???

Isn't this whole 4WDing thing fun!  :D

Now, I'm going to go and find something else to bolt to Sooty. There's gotta be a gadget I have overlooked somewhere...  ;D
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Taf

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Re: petrol to diesel conversions - is it possible?
« Reply #10 on: January 10, 2013, 10:39:04 PM »








Thanks again to everyone for the advice. I always thought it was a long shot but you have all pretty much confirmed my thoughts ...a conversion simply isnt worth the money/ hassle involved.

I suppose i just need to get the fuel economy fixed on the challenger. I dont know what is causing the problem, but the fuel economy is definitely getting worse. When i first bought her i was getting around 480 on the standard tank (70 litres), now im getting 520 on the 125 ltr tank. I have run the tank down till its spluttering along on fumes. Refilling then takes around 118 litres. Its not something that has only occured since i had the larger tank fitted, fuel economy was decreasing before that.

I realise i have added the accessories, such as bar, winch, 2 inch suspension and dual battery, but not enough to casue the decrease in fuel economy that has occured. I have changed the leads, the plugs, the air filters, added a snorkel in the hope that the ram air principle may help, added free wheeling hubs, changed the 02 sensor...plus a few other things, and yet the distance i can get from a tank still continues to decrease.

What concerns me is that i hope to go to the cape in June. If im only getting 500 per tank on sealed roads, then ts going to be even worse on the roads/ tracks at the cape. Im concerned i wont be able to make it between fuel stops in the top end.

I have considered taking the car to my local mitsubishi dealer and asking them to see if they can sourse the problem....but that is a frightening thought as it will probably be very expensive exercise, although i accept not as expensive as a conversion          ( although we are talking mitsubishi dealer here)

Taf

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Re: petrol to diesel conversions - is it possible?
« Reply #11 on: January 11, 2013, 07:39:29 AM »
Hiya Taf, before going down the road to the local mitsubishi dealer, go see an auto electrician or someone who has one of those OBDII scanning devices. They may be able to tell you what may be the problem without charging & arm & a leg for the service.

When I was having problems with my Jackaroo, I finally went to a local mechanic who had such a device & I was told that my MAP sensor wasn't reading (working) correctly. 
 All it turned out to be a blocked pipe & now the Jacks running good.

That's my advice :)
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Offline Kris

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Re: petrol to diesel conversions - is it possible?
« Reply #12 on: January 11, 2013, 08:12:23 AM »
Hiya Taf, before going down the road to the local mitsubishi dealer, go see an auto electrician or someone who has one of those OBDII scanning devices. They may be able to tell you what may be the problem without charging & arm & a leg for the service.


I have one such device if you want to try this before you go to a mechanic  :o

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Re: petrol to diesel conversions - is it possible?
« Reply #13 on: February 05, 2013, 01:05:52 PM »
Taf you could look at LPG, doesn't require an engine change, power is about on par with petrol but maybe a bit higher usage but considering the price you will still save money.

I would suggest you take it to a performance specialist first, you might have a bottle neck in the system, if snorkle, high flow filter seemed to make no difference maybe the exhaust is the problem.

Remember with cars that have computer controlled fuel and engine management you could possibly be using up to an extra 8L/100k's just because of a dodgy sensor not allowing efficient fuel supply.

A performance specialist should be able to look at and answer all those questions.

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Re: petrol to diesel conversions - is it possible?
« Reply #14 on: April 04, 2013, 09:46:05 PM »
Hey Taf, 
Fitting LPG to your Challenger might be difficult due to your long range fuel tank, although the LPG tank may be located where your spare wheel is currently. As for the transport of petrol outside the vehicle, I was of the understanding it was the only way to transport any combustible fluids. Do you carry any form of roof rack or cage? This will have a remarkable effect on your fuel consumption due to weight and wind resistance. It is also a good idea to get the injectors cleaned and bench tested, and while you've got the manifold off you can remove the crap genuine spark plugs that you could very likely have installed with the belief that they were platinum plugs and good for 100000 kms as this is not the case. The genuine plugs are (according to NGK who make them) a standard plug good for 50000 kms max and half that if running LPG.
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