In case you thought that LPG conversions were for treehugging, penny pinching slow driving, woolly jumper wearing motorists with a guilty conscience – along comes Future Power with an LPG conversion package that is ideal for high performance cars and luxury vehicles.

http://www.duemotori.com/news/auto_news ... HP_Car.php

Blimey, that's a lot of press over a 300bhp LPG car! Roll up, who wants to sponsor my car? With a remap and the ignition advance module hooking up it'll be over 300bhp too!

Rich

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Alpina B3S 3.4L - Prins VSi

Here it is.....
http://www.rsportscars.com/eng/cars/acs_gp310.asp

haha, a 5L V10 engine... that's cheating!

I'd be interested if anyone has any press about lower capcity turbo engines reaching high power levels...

Nice find on the BMW though!

Richard

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Alpina B3S 3.4L - Prins VSi

Ooops! My mistake. It's not on LPG, it's on E85.
I'll get my coat.
Sorry.

With when using a high powered 4 pot turbo engine you start to reply on high pressure to provide the extra power which may lead to EGT issues and valves breaking / melting

Water Injection could be used, however, that's yet another system to bolt on to merely 'fix' a side effect of Propane. Obviously petrol evapourates iside the cylinder cooling things down - which allows you to overfuel the car slightly to keep control of the tempprtures. LPG burns so cleanly and has already evapourated before it reaches the injectors so there is non, or little heat transfer (which is why liquid LPG kits or of BIG interest!! )

Rich

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Alpina B3S 3.4L - Prins VSi

So was that 300 HP at the wheels or the front end?

I had my Jaguar XK8 dyno'd after significant performance enhancements (straight through zaust, apexi intake, larger injectors, auto-rx, motorvac carbonclean, port/polish, racing cats, Royal Purple) at 337 BHP at the front end (stock is 290). with transmission loss of 17% that put down 280 to the rear wheels

Dyno's were done at Nobles. Since converted I've managed 322 miles from a single 59L fill which in cost terms works out to 68 MPG!!

Regs

Mark

Hi Mark, that was at the flywheel with a 2L turbo engine. I imagine your jag must have at least a couple more cylinders and probably double the capacity?

I get nowhere near that mileage with my car... I guess I need to spend some money getting it remapped properly on a RR really and get the ignition timing module doing some work!! My ECU cannot advance the timing at all, so when on LPG it's running retarded technically, which must be loosing me both power and mileage!

When I planned the installation I calculated about 320 miles to a full 70L tank (-10%) but have only got 305 miles on a very long slow run.

My car returns between 25 > 30 mpg normally... but only really returns 260 > 280miles to a tank with average driving.

I guess it just shows it really pays to have the car setup properly!

Nice result!

Rich

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Alpina B3S 3.4L - Prins VSi

Damien with all of the enhancements (particulalry the engine clean, TB clean and changing to Royal Purple 5w30 and the cleaned calibrated injectors & nitrogen in the tyres) I have achieved as high as 37.4 MPG on a 360 mile run on unleaded. That's way higher than any quoted manufacturers figures.

It was slow with a combined speed of 62 MPH (but what can you do with average speed checks so common?)

That was trip computer and (since I always suspect these of being inaccurate) fill to brim showed it only 0.2 MPG out. Always run on Tesco 100 RON

It's a V8 3996cc, 290 BHP, 393NM

After mods it was 337BHP and a healthy 440NM

Regs

M

hi all just a quicky
we recently converted a aftermarket supercharged 330ci convertable running 330 bhp using the latest romano

at higher output points the new software allows the sytem to mix petrol so eradicating lean problems

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300 mark for a 4 cylinder turbo is quite common for us to do these days and about 400 from a V8. The thing taht makes the differnce is how you acheive the fueling. If you have to mess about with two reducer etc to get enough fuel that is a real pain.

500 BHP from a 4 cylindee turbo is what I would like to have a go at doing

Carb? We haven't used carbs for years! I suppose it depends on how you define, not need. You don't need most of the carb but you do need a throttle butterfly (which is what you find were a carb would be on any petrol injected car). There have been very, very few turbo cars that still use a carb as the extra pressure either blows the carb seals or the carb itself has to be fitted inside a pressure chamber. Virtually all turbo'd cars use injection so the turbo blows straight into the throttle butterfly.

I suppose that theoretically you could use an injection butterfly in place of the carb if you were going to use a single mixer LPG system but all the modern systems use sequential injection (just the same as petrol injection). A mixer system can be made to start on LPG from cold but an injection system needs to warm up on petrol before switching over.

I like threads like these, all the differences of opinions and the 'facts' that are stated.

I have a 4 cyl turbo car pushing out just shy of 300bhp on a Prins system. Copes very well and has 11bhp more on gas than on petrol. Tested on the drag strip and lamdba tests etc done on a rolling road. Car was always good but I just had a high flow outlet valve fitted to the gas tank (as the original one and the replacement one fitted under warranty were both useless) and she really flies now and is smoother than ever. Need another session on a rolling road and to get my race cam fitted then may see 310 bhp

What's a high flow outlet... any pics?

no piccies sorry, it has a bigger bore in the soledoid valve than the one Stako supplied with the tank, chucked the old one away now. Called Tinleytech when I needed the new one and they sorted it out for me.

I just posted up a thread asking about LPG convterting a 4 cyl turbo jap motor but this has seemingly amswered most my questions now =)

Turbo's and carbs were common place in teh 80's and early 90's. One of teh most common to see was the MG metro turbo. Most turbo conversion kits at that time and still sold now for classics use carbs. Setting up a carb for turbo installations is not easy and boost pressure is slightly limited but there are plenty of cars out there with them.

Personaly a turbo carb engine or mechanical injection system is going to want a stand alone Gas Injection system but these systems are quite rare and difficult to map out correctly.

There is a limit to how much gas Vapor you can pump into a cylinder and combust it, or even get it in there in the first place.. For the ultimate LPG conversion only a Vialle or other liquefied injection system could cope with realy high demands.
The cost is a bit on the extream side, but so is the cost of a prins conversion.
Reliable.. My own vehicle was converted in 1999 and with the exception of a pump in 2007 has run faultlessly for 142000 miles..
However a good example of a VIS is Tom Onslow Cole an up and coming touring car racer running a Focus RS on GAS!! Google Him...