Ive learned to "love" LPG purely due to my car was setup with it and engineered when I brought it. If I had my time agin and was building the car from scratch I would go EFI lots more experience out there with it and alot easier to tune. Main advantage of LPG its easier to engineer thats about it

Leigh, Im sure youll agree straight LPG is way better than "a carb" when considering LPG + boost versus Carb + boost. Also check your oil in comparison to using both its like night/day :) Im also a big fan of LPG rotaries, a match made in heaven. LPGs lubes rotor seals and keeps them from carbon locking/buildup & the oil is like new service time.

Stu, LPG also rids Pollution gear and great economy with todays prices heading skyward and LPG been touted as its rival for the next 30 years as the oil crunch kicks in.
Almost all Datsun devotees have at some stage considered the brand due to budget consciousness + savings otherwise we would be modifying Euro high end cars instead.

I never liked big XD-XF Fords, ugly is and understatement but when witnessing them destroy high tech efi cars using boosted pushrod L6 crossflow straight LPG setups and recently boosted SOHC taxi LPG sixes with everyday economy you sort of have to give credit to the comfy boat on wheels thanks to LPG.

If the money is there I would even suggest LPG injection over petrol injection for economy, cost will be the same and pollution gear again goes out the window.

After driving a subey 22b with vf34 and a sylvia with disco potato both with equivalent low lag and around 280 ate I cant see an improvement in 1.8-2.2 litres by going bigger turbos A responsive 220hp atw beats a laggy 300hp unless you spend big money and consider compound turbo setups.

For a streeter even casual track car a responsive 180-220hp atw and 2 to 3 times the torque of stock modern 2Ls in such light car is about as content as most should be.

As for the L head as much as I respect them I just love the crossflow layout + history of the Z18et & how it holds the all time track record on the old Bathurst track, no other Nissan could match its lap record.

Loving all the input here guys...it's good to get as many ideas and opinions to help decide what to do...especially for someone like me who has never built one of these type of engines.

LPG is not a definite at this stage it was just a suggestion/option...so we will cross that bridge when we come to it.

I myself kinda already knew that using Morrows motor as an example was not really relevant as I had already assumed that it was a highly developed engine which costs a lot more money than most of us are willing to spend or rather way too much to put into a street car. But I suppose it can be used to demonstrate the Z18ET potential.

Looking at both setups (A15 EFI & LZ combo) on face value it appears that the A15 would probably end up costing more with a not so good or not good enough result...for me anyway.

It appears in the other hand that the LZ would be inexpensive to put together...more reliable and more power and potentional...more performance upgrades/options.

My goals are to have a car that is both very quick for most street cars but yet still very drivable if I want to drive sensible with some level of comfort...not like a pig.

I plan to take it around the track once every blue moon. I want the car to be able to be driven daily of need be so reliability is big for me.

I'd be extremely happy with somewhere 180-200kw atw. A 12 sec pass down the 1/4 mile would be even better...I'm not sure if those figures compliment each other.

I'd like to find a combo that can achieve all this but weighs as little as it needs to be and nothing more.

As this build is going to be over a big length of time, the cost isn't too much of an issue for me.

Now you all know exactly what my goals are. Whether they are achievable I do not know...which is why I'm here. :)

Keep the comments/opinions coming.

Cheers, Joey

Just go ca and pocket the change then. Stock ca will get you close to a 12 if you sort the handeling.
Your also going to need stumpy gear box and a strong rear diff set up. More weight.

For that level of performance and power that extra 10kg if l series vs l z head vs z18et is going to mean pretty much nothing in terms of dulling performance.

If anything I find my 1200 to road hold better with a bit more weight in it for road driving- even in fun.

Stay clear LPG if you are like me and don't want to develop it properly- my system compromises outright performance and is carb like. Stus is leaps and bounds ahead. And there's still vapour or LPG injection but out if my budget lol.

Plenty of boosted l series 1600 and blueys out there, old school technology will get you almost your goals cheaply reliably if kept simple

When the time comes the cost of petrol inj vs LPG inj
can be its own debate on another thread but I feel for
the cost of setting up both in the long run Id lean
the LPG inj for the previously discussed points.
These tanks are hard to ignore if I went this way they
are about 20-40 per cent more than good quality steel
http://www.ppidts.com/propanep/gallery.html

Sorry D, I forgot yours is the only opinion that matters. As for the LZ. It is actually a real motor. A twin cam L series. And sure Anthonys motor is highly developed. But all you have to do is ask him and he'll tell you. I even know a fair bit about it. His dad is always crapping on about it to me at work. Most of it is in the tune. And it's an L series block.

LPG is a bit of a devils advocate D it's great when it works but frustrating when its not.It's taken me alot of ups and downs to get my car to where it is now and ive got to admit ive thought about putting it back on fuel many times. But now I think ive got the LPG part mostly sorted and the car runs well its just a big learning curve. Like Mik said if your not prepared to put in the devolopent time I would stay clear of LPG even with injection. No one I know of makes a kit that can be run with a stand alone ecu? and not piggyback of the factory one and if there is let me know

Don, your ideas on the lite mani can be applied to both donks & the donk lean negativity is a bonus.
So they where a bit of & deserved to be treated as such. The LZ18et, LZ20et as you would know is a loosely coined term for L cranked Z18et not official so rest assured I will sleep well at night if I insulted a rare owner of a "real" LZ. Just good Hybrids for different strokes and purposes.

LPG has its issues yet when setup properly you get 10-20% less hp than EFI but more than 100% economy.
Stu, seems GR throttle bodies have their share of issues for tuning with all brands of converters?
If there is a cheaper and easier EFI setup I will never steer anyone away from it. The only standalone setups I know of are the Vapour inj units http://www.profire.com.au/ and JTG icon for liquid phase inj http://www.alpgw.com.au/Products/Systems/JTG-Liquid-Injection.aspx
Also some folk have an MS LPG setup (Cletus Racing in Oz?) & some other one somewhere on the Megasquirt forums.

Ah, so ruredi you want everything?! :P

It's really up to you, and pretty much most combos will get you what you want. Personally I wouldn't fart around with LPG unless you are really keen on a troublesome underperforming motor that gets good milage

I was looking into the lz combo for my thou but my goals were different - 10 sec pass and cruise. Weight and cornering were no issue. If you want to be different then EFI l or a series would be cool. Ca has been done lots, but for a good reason. The z head is not fantastic, and if you are going to l series bottom why not just keep it all l.

Orrrrrr... If you want to go crazy and have some know how a ka head on an l series or a bike head on an a series.

If George Fury, Stu and Andrew Morrow used an L head Id stand down. Yet it seems the Z18et head seems to scare many SR owners into sticking to commuting via double story London buses :P

I wouldnt complain or mind Stus "miser" setup personally.

On the EFI note theres are some Kiwis that have successfully setup a cheap CA18DET ecu for the Z18et I think on Ozdat.

A Disco Potato or vf34 snail would be a good start to the recipe, there are even suzi g13bs using them now successfully.

Otherwise "Ange" has the other engine setup that is hard to ignore 12A BP but then economy does become an issue as a daily.