bradkazz

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Hello All Time to dig up an old one again. I recently killed my LPG powered GTS by over reving, prior to this I got it up to 400rwhp with a GT35R. Sold after fitting new engine. We never found a willing customer, so I now have a 96 R33 GTR and it's going on gas. Brad

Used Apexi Power FC with hand controller. Currently fitted to 1996 R33 GTR, factory engine with upgraded turbos. $900ono Located in Perth but willing to post interstate. Brad

Some of the post I have read indicate that the ATTESA and ABS also use a tacho signal, the factory ECU outputs a tacho signal from pin7. I assume you will need to connect the Microtech tacho out to this same wire.

From what I have read, once the idle voltage is adjusted to 0.4v the Attesa will function, but becuase the ramp rate is not exactly as expected the system will apply more front bias at a lower throttle opening. An additional circuit should not be required, but it would make the system function exactly as intended. Perhaps your issue is related to the tacho signal.

Hello I am researching the same issue for an ECU install. So Far I have; The ATTESA requires 0.4V to 3.5V TPS signal The factory ECU has an inbuilt amplifier that generates the required signal. When using an aftermarket ECU, that does not offer TPS out, the RB26 wiring loom requires modification to the wire connected to pin 56 TPS output signal. The wire at pin 56 needs to be cut off and T connected to pin 38 TPS input signal. The TPS sensor needs to be manually adjusted to provide 0.4V when idling with the throttle closed. Your Microtech should have three wires connected to the TPS Ground 5V power TPS Signal (connect to Microtech and ATTESA) I have not tested this option, but provided my research is correct, you need to connect the wire that was originally connected to pin 56 to the TPS Signal wire on the Microtech and adjust the tps until it reads 0.4V at idle with the throttle closed. I beleive the ATTESA also requires an RPM signal which is generated by the factory ECU at pin7. I intend to build a simulation amplifier and will post the design once complete

Apart from the cost there is no problem running two tanks. The triple tanks are all connected together and they only have one outlet, so unfortunately they don't help. Some may say I am ill informed about how to get the power out of a single tank, however I know exactly how to do it but the Australian Standards for LPG do not allow any modifications to high pressure components.

Unfortunately most of my time is being spent on customers cars, plus the skyline is my daily, so it's been on hold. 13.9s gets me to work. I have a new engine in my RX7 which should do 11 seconds, just finishing off the cooler piping. The only problem with 300rwkw is the tank, they have an excess flow limiter. You may need to run two tanks.

RAGE Racing is our WA Distributor, they are using our ProFIRE system. They don't have a website, have a look at www.profire.com.au, we have info of a few of their cars.

We have added a couple of pics of the RB20 powered Hilux to our website, so far its made 241rwhp at the recent Motorvation dyno comp. I have just purchased a 1993 R33 GTS, I will be fitting a toroidal tank tomorrow and will hopefully have it running on LPG within a couple of weeks. I intend to install 12 LPG injectors (staged) and 2 regulators. I have also been looking at the horsepowerinabox.com RB25 turbo upgrade kit, has anyone got any first hand experience with these? http://horsepowerinabox.com/HPIAB2/category50_2.htm

Hello All Just thought I would provide an update, we have finally put a skyline engine on LPG, a baby one at least. We have fitted our ProFIRE system to an RB20 powered hilux, the latest issue of Perth Streetcar mag has an article on it. Runs well and was easy to tune, after we replaced the iridium plugs, they are not very compatible with LPG.

It is true that LPG Liquid injection would be a very complicated system, which is why our system like all of the other current LPG injection systems is vapour injection, not liquid. The water pipes that you are talking about are actually used to heat the lpg to cause it to vaporise. The LPG is delivered to the engine via LPG injectors as a high pressure vapour. The injector flow is massive in comparison to a petrol injector.

the actual address is profire.com.au but either one will get you there

How do I answer this one..... Sprint gas, Bohemo, Appolo gas, etc all have gas injection systems but they are not aimed at the performace market. I have seen some of them and they work very well on standard cars. They do not have ignition control so the mileage would not be as good as it could be and like I said previously I don't think they will work with forced induction but it is worth asking them. I have basically just described the design brief for our system. I/We have been running lpg on many different cars for many years and have seen all of the benifits but it has never run exactly right. For example the gas research throttle body is a great idea and produces very good power but usually runs rich so emmissions and economy are not the best. A standard gas mixing ring gives good economy but at the expense of power. So thinking that it would be an easy project we set out to design a system that could do everything, 3 years, several board revisions and 15,000 lines of code has finally provided what we were after.

sorry don't know what happened with my last post I don't have any contacts over east at the moment. In the future we intend to have distributors in your area. Most gas installers should be able to setup our system - you could contact some local people and ask them to contact us, via our website. We can provide all the information they would require. Some of our competetors also have gas injection systems, but I am not sure if they can do turbos, it may be worth making a few calls.

I forgot to mention pricing you would be looking at about $2500 in hardware and about $1000 labour. LPG injection is basically 1K more than a standard conversion

Hi Steve We are using Keihin LPG injectors - they are supposed to last about 200,000 ks. I have been running injection on the laser for about 20,000 ks so far with no problems. The catch is we are based in Perth and at this stage we are trying to keep all of our installs local until we have done more testing. We only want to supply parts to the most eager eastern states tuners at the moment. Our Profire ECU is a complete replacement for the factory ECU this means if you run straight LPG most states will allow you to remove the airflow meter (we use a map sensor) and the catalytic convertor. The secret with the milage is in the tuning my car runs an optimised ignition curve, and even though LPG has less energy the slow, even and more complete burn means more of the energy is converted into kinetic energy. From my research I am getting better milage than most other BPT powered lasers.

Yes I am one of the designers of Profire engine management. The laser, which is actually my car, is running multipoint gas injection and direct fire ignition. The engine is a Jap spec BPT (134KW version) which is basically the same as the later model TX3. It is producing approx 175KW @14 psi and gets about 10km/L. Drivability is basically the same as petrol except that the power delivery is smoother and the gas gives more bottom end torque. LPG injectors, 1 per cylinder, replace the gas carby and the LPG vapourises is a high pressure type ie the gas is delivered to the injectors at about 20psi. The laser runs straight LPG so I installed the gas injectors into the factory petrol injector ports. I/we are willing to help anyone who wants to run LPG especially turbo owners.

I couldn't help but notice that our website was quoted, so I felt compelled to get amongst it LPG is not just a cost saving excercise it is a high performance fuel, and in my opinion the only fuel to run on a turbo charged engine. Have you ever heard of a decarb being benificial, LPG cleans out the entire engine and dramatically reduces engine and turbo wear. After 10,000 ks the oil is pretty much as clean as when you put it in. When LPG is injected the engine power is equivalent to or more than petrol and the power delivery is smoother due to the higher octane rating. I totally agree with all of the negative press that LPG has obtained over the years - for example Nissan spends several million dollars developing an engine and engine management system so it runs sweet and Jo from down the road installs a LPG system that he put together from a few parts that worked ok on the family commodore..... need I say more, but if you spend a S**t lot of money and put in a H**l of a lot of work believe me LPG runs Bloody good!!!!!