Been pondering on this since I spoke to the legnum vr4 guys at japfest 2. A couple of the are running it on tuned legnums (300bhp, 2.5 twin turbo V6), had them a couple of years and do daily drive, trackdays, dragtrips the lot. 1 of them installs the kits and inspires a lot of confidence with his knowledge. He actually maps the car on log as you would with petrol, with an afr meter etc. Recon a 60 litre spare tyre tank would go in the wheel well. My Z is running 18 psi with full rebuild and gt28 turbos. Any thoughts? Heard the horror stories about valve seats and less lubrication etc. But everything I threw at the legnum guys they had a good answer. Backed up by years of track work with their own cars.

Any advice welcome. Used the search but to no evail.

Cheers

Danny

Hi Danny,

 

if you're thinking about doing it to your ZX, my advice is don't bother mate!! Use the money you'd spend on the conversion to buy yourself a more efficient daily driver (eg a Golf TDi or the like) and keep the ZX as a weekend classic.

 

It should cost you less in the long term for sure mate; and there'll be no worries about the ZX having engine running issues.

 

Richard:cool2:

Have a daily car mate. Mazda 6 td estate. Z is a weekend car and track weapon. But it could be a whole lot cheaper if it would run on lpg. My last fill up cost £100, and only got 220 miles out of it. Worth every penny but just exploring the options. The legnum lads swear by it. One guy has covered the cost of the car in 3 years being his daily car. They do similar mpg to the Z aswel. Cheers for the advice though. Let's see if anyone has any experience or technical views on this.

Thanks

Danny

I've driven LPG car before and when it changes over there was no difference what so ever, the only way you could tell was a click from a relay and a little green light came on lol.

lpg is good, no question about it

That's the feeling I'm getting so far. But is there no one out who's done it to a tuned Z successfully. Even thought of like a dual map, use lpg for general driving then swap to v power for the track etc, because like has been mentoned, the switch over is seemless. I've a rough idea of the science and theory of the stuff. But its the application to a tuned Z that I'm unsure of.

Keep em coming chaps. I'll take the Z to the legnum guy who does the installs and see what his views are aswel.

Thanks

Danny

tuned z no, but the guys in the states are running big power cars and using lpg

ive seen a 200sx s13 ca18det converted to run lpg, is lpg still avalible in petrpl stations thought some got rid of it.

I had a 4.6 range rover on LPG and I did notice a performance drop off with it but only slightly. The only thing to watch for is that LPG burns slightly hotter and the range rover was prone to head gasket failure because of this. As far as vale seat damage you can run flash lube to stop that.

I've seen loads that still do it. easy enough to make it worthwhile. It'll only be like trying to find v power. Around 70p per litre. Surprised there has not been a thousand 'don't do it, it'll blow your engine up' posts. Could be a good thing. Or is there that little experience with actual Z,s. Know of fair few different models and makes running it with no problems.

Cheers

Danny

90 percent of shell petrol stations sell lpg and there is also a very good app that shows where all local lpg stations are

Nowt wrong with an lpg conversion. Even on a zed but price can put a lot of people off and theres also a lot of bad converters out there. I converted a 2006 micra sport+ a few weeks ago and still quite busy with conversions.My zed may have 1 to shut the bad press up:lol:

Would it be an expensive kit on a Z then. Assume the lpg injectors would have to be equal to the petrol ones. 555cc in my case. It it nearly halves the fuel costs doesn't it. And am I right in thinking you don't have to change the oil as often because it's not getting as contamininted by the petrol.

Not shaping up to be a bad thread this. Clearly a gap in the market here.

Cheers

Danny