Spoony Member 250 Member For: 14y 4m 25d Gender: Male Location: Brisbane Posted 28/06/12 05:15 AM Share Posted 28/06/12 05:15 AM Also no lpg system switches cleanly from petrol to gas or vice versa if its switching while your on boost halfway through the rev range the timing will be all over the shop and it will ping for sure, only gas systems iv seen on turbos run at idle/cruise anything higher and it switches to petrol, just get rid of the gasIncorrect information. The right gas system does not need to switch back to petrol. Have a read on here and the net, there are F6's on LPG, others have made over 300rwkw. The check engine light came on after doing the exhaust I'm guessing? The different cat is probably causing this, probably not doing too much that cat's are suppose to do........ ie piss on you front door step, car, garden etc. hahaRatter has summed up the limits are the Orbital system. A straight petrol tune is going to be your only option for HP. Then with larger injectors you may have an issue with the stock/gas tune on start up. My experience is the taxi's do quite will with large variances in injectors size 30% for just basic running if the O2's working well, but with the stock tune this may through a fault code as I'm not sure what they allow variance wise. 36lb injectors would probably be OK vs what the gas is calibrated at. Others may have an idea what sort of power, I'm guessing 290rwkw or so from them, max maybe? Link to comment Share on other sites More sharing options...
bionicxr6t05 Bronze Donating Members 2,216 Member For: 13y 7m 9d Gender: Male Posted 28/06/12 08:15 AM Share Posted 28/06/12 08:15 AM Mate have a read of the comment again, I was commenting on the switching operation of the system as to what the op said his does and I personally have not seen a gas system on a modded xr6 turbo, I have fitted a few to standard cars though as I am a qualified lpg fitter/modifier 1 Link to comment Share on other sites More sharing options...
JH07XR6T Member 31 Member For: 12y 8m 24d Gender: Male Posted 28/06/12 09:27 AM Author Share Posted 28/06/12 09:27 AM I keep killing the check engine light with a bluetooth scanner and torque app.but its getting annoying,I've emailed orbital about the injectors, but I'm really thinking of putting a stock cat in which will kill the light for good, can't be bothered clearing codes every 100kms..." turn the engine light off and leave the car alone."me thinks so Link to comment Share on other sites More sharing options...
Spoony Member 250 Member For: 14y 4m 25d Gender: Male Location: Brisbane Posted 28/06/12 08:50 PM Share Posted 28/06/12 08:50 PM Mate have a read of the comment again, I was commenting on the switching operation of the system as to what the op said his does and I personally have not seen a gas system on a modded xr6 turbo, I have fitted a few to standard cars though as I am a qualified lpg fitter/modifierOk fair enough, doesn't make it any more correct though. The system used on the HSV is an example of seemless switching/integration. http://www.carsales.com.au/news/2010/commercial/hsv/lpg-for-hsv-e3-21750 "LPI is available until between 4000 and 4500rpm when the ECU switches seamlessly to 100 per cent petrol operation. The computer also switches the car to petrol automatically for starting" .My mates old 4.0 hilux under high rpm/load also dropped back to petrol with it's vapour injected system, I could never tell. In your experience fitting lesser LPG systems perhaps they can only handle low power outputs, but there are systems that can handle stock FPV and HSV outputs and more if need be. Re the cat. Mine has an aftermarket cat, rest of the exhaust is stock but it doesn't through an engine light if driven on the stock tune. My understanding is the second O2 sensor is just for monitoring the cat/emissions. Perhaps the aftermarket cat is more of a fake cat or something? Link to comment Share on other sites More sharing options...
bionicxr6t05 Bronze Donating Members 2,216 Member For: 13y 7m 9d Gender: Male Posted 28/06/12 09:52 PM Share Posted 28/06/12 09:52 PM (edited) It says seamless because it feels that way, if you monitor ignition timing and the switching point it is far from seamless, im not talking seat of your pants im talking live data on a screen, and vsi systems I have fitted are adjustable and fully diagnosableLoad switching is fine for factory n/a's but far from ideal for boosted applications hence you dont see many people using them in this fashion Edited 28/06/12 09:54 PM by bionicxr6t05 2 Link to comment Share on other sites More sharing options...
Spoony Member 250 Member For: 14y 4m 25d Gender: Male Location: Brisbane Posted 28/06/12 10:16 PM Share Posted 28/06/12 10:16 PM Yeah I have no doubt that there's be a bump/step if watching live mixtures etc, but obviously isn't too much of a concern to offer 3 year warranty of a 325kw car with it? I remember reading of at least one XR6T with the same type of system/fuel fall back. Not all systems work like this and allow for this. Most of the XR6T's that have been put on gas recently for performance have used the JTG system, which doesn't fall back as it can supply sufficient gas, two pumps can be used if required. Link to comment Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 16y 9m 20d Gender: Male Location: adelaide hills- 'race air' central Posted 28/06/12 10:41 PM Share Posted 28/06/12 10:41 PM mate your missing the point. boosted applications are vastly different to n/a,. if you have a poofteenth of a lean moment on boost then bang. a boosted/ tuned big torque motor is nothing like an anemic hsv... 1 Link to comment Share on other sites More sharing options...
bionicxr6t05 Bronze Donating Members 2,216 Member For: 13y 7m 9d Gender: Male Posted 28/06/12 10:56 PM Share Posted 28/06/12 10:56 PM that's what im getting at panda and running a properly tuned gas system is fine as long as it stays on gas and doesnt switch halfway through the rev range under load, so my above comment is correct, you just missed the point Link to comment Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 16y 9m 20d Gender: Male Location: adelaide hills- 'race air' central Posted 28/06/12 11:04 PM Share Posted 28/06/12 11:04 PM it wasnt aimed at you bionic. I agree completely. the SWITCH from petrol to gas would cause big problems at 4000rpm and 17+ psi... Link to comment Share on other sites More sharing options...
bionicxr6t05 Bronze Donating Members 2,216 Member For: 13y 7m 9d Gender: Male Posted 28/06/12 11:06 PM Share Posted 28/06/12 11:06 PM Haha sorry panda by you I meant spoony 1 Link to comment Share on other sites More sharing options...
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