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| Thread ID: 88626 | 2008-04-03 01:14:00 | new car exhaust law june 1st this year | markh (12164) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 655716 | 2008-04-07 21:27:00 | Running rich sure doesn't help - but running on AV Gas does! :p On that note, does anyone (I'm looking at Joe here) ;) know what (if any) ill effects running av gas will have? (Apart from the fact it's illegal to do that on public roads here). Assuming you get it all tuned etc etc. Would there be any more wear and tear than normal, or components wearing out sooner? |
wratterus (105) | ||
| 655717 | 2008-04-07 21:43:00 | always cracks me up when boy racers nail it and out comes a big puff of black smoke. thats the case with every ricer down here in invercargill its not THAT hard for them to lift up that imitation Carbon fiber bonnet and clean out their counterfeit K&N pod filter and maybe check the plugs and give it an oil change is it???? you see them all driving round and the back bumper\bodykit is covered in enough soot you would mistake it for a deisel! |
MAC_H8ER (5897) | ||
| 655718 | 2008-04-08 05:36:00 | Running rich sure doesn't help - but running on AV Gas does! :p On that note, does anyone (I'm looking at Joe here) ;) know what (if any) ill effects running av gas will have? (Apart from the fact it's illegal to do that on public roads here) . Assuming you get it all tuned etc etc . Would there be any more wear and tear than normal, or components wearing out sooner? There are legalities here too . . it's the DOT tax on fuels for over-the-road compensation to the states and municipalities that make and repair the highways . . etc . Anyway . . . if you run an engine on a fuel that is too high of an octane, you just decrease the power as the fuel is still burning going past the exhaust valves (extra heat) and out the exhaust (can set the cat on fire) and burn out the exhaust pipes, even if they are double wall as required here in the US . If you raise the compression, change the cam, valve seat angles and contact area, retard the camshaft timing a little and re-curve the distributor (if it has one) advance profile, then you are getting closer to needing and being able to efficiently use the av-gas . No distributor? Then get a re-curved chip for the ECM module or whatever engine management system you have . You can also run a supercharger or turbocharger (different technologies) and jack the plenum chamber pressure above 20 lbs/sq inch and just drive the crankshaft out the bottom of the engine block . Carry a shovel and a broom to recover your engine . A lot of engineering without a CRAY to help you and you won't have a car that you can sell to anyone but someone who likes it exactly the way you've built it . It could also become your sarcophagus . (Try SRV's version of "Willy The Wimp ( . youtube . com/watch?v=yLZI2z19vbQ" target="_blank">www . youtube . com)" for info on this if you need . I am sure you can get a copy from Mr . Black . ) |
SurferJoe46 (51) | ||
| 655719 | 2008-04-08 05:39:00 | Thanks for that Joe. An interesting read. I sure as hell wouldn't wanna set the poor cat on fire! :p Anyway...if you run an engine on a fuel that is too high of an octane, you just decrease the power as the fuel is still burning going past the exhaust valves (extra heat) and out the exhaust (can set the cat on fire) and burn out the exhaust pipes, even if they are double wall as required here in the US. |
wratterus (105) | ||
| 655720 | 2008-04-08 06:26:00 | i think he means Catalytic Converter but yes dont set the cat on fire! Also: img149.imageshack.us |
MAC_H8ER (5897) | ||
| 655721 | 2008-04-08 06:35:00 | Ahh...'course. :blush: T is next to R.... |
wratterus (105) | ||
| 655722 | 2008-04-08 14:07:00 | Running rich sure doesn't help - but running on AV Gas does! :p On that note, does anyone (I'm looking at Joe here) ;) know what (if any) ill effects running av gas will have? (Apart from the fact it's illegal to do that on public roads here). Assuming you get it all tuned etc etc. Would there be any more wear and tear than normal, or components wearing out sooner? avgas in NZ (and probably elsewhere) has oil in it to stop it freezing at high altitude. plus what surferjoe said i find (and so do many other bikers) that my high performance motorcross engine runs well on a 50/50 mix of 91 and avgas. cheaper and easier while just as effective to run on 98. but seeing as that runs a compression of 12.5:1 and your car would be lucky to do more than 10:1, i doubt it would be worth your while. get some bp98, do some mileage tests, and see if it is cheaper to run. |
motorbyclist (188) | ||
| 655723 | 2008-04-08 20:35:00 | down here all we can get is "regular" 91 octane and "ultra" 95 octane was running my car when i first got it on 91 as i wasn't sure what would happen if i ran 95 through it until one of my friends slapped me round the back of the head and explained that since my car has a 11:1 compression ratio that the cars' computer is most likely retarding the timing so much as to keep it from detonating too early in the combustion cycle and is probably sacrificing a good chunk of power while using a lot more fuel than needed so i tried a few tanks of 95' never going back to 91 :p car runs much smoother, gets about 50-75km more on a tank of petrol and has a **** Load more power off the 95 octane fuel according to the Toyota guys my car being a jap import is most likely programmed to run on 100 Octane Fuel and the nearest place with 98 is Christchurch and thats a bit far just for a tank of petrol :rolleyes: wratterus: you say you have a SR20DE? Google Says they have a 9 . 5:1 Compression ratio so 95 octane fuel might not have much affect on it BUT i say give it a try and if it runs better and cheaper then it might work out better - plus a 9 . 5:1 Compression ratio opens a door to a possibility of some light turbo charging :drool |
MAC_H8ER (5897) | ||
| 655724 | 2008-04-08 21:11:00 | i find (and so do many other bikers) that my high performance motorcross engine runs well on a 50/50 mix of 91 and avgas. cheaper and easier while just as effective to run on 98. but seeing as that runs a compression of 12.5:1 and your car would be lucky to do more than 10:1, i doubt it would be worth your while. get some bp98, do some mileage tests, and see if it is cheaper to run. I haven't actually run my car on avgas, I don't see the point, but I have seen done up Subarus running avgas have a massive performance increase. Like huge. I have done 'tests' :p with my car running 91, 95 and 98. 95 is the best value for money, and the car runs way smoother than with 91, but the difference between 95 and 98 is minimal. Definitely a bit quicker on 98, but not a lot. The economy with 95 is far better than with 91. |
wratterus (105) | ||
| 655725 | 2008-04-08 21:16:00 | down here all we can get is "regular" 91 octane and "ultra" 95 octane was running my car when i first got it on 91 as i wasn't sure what would happen if i ran 95 through it until one of my friends slapped me round the back of the head and explained that since my car has a 11:1 compression ratio that the cars' computer is most likely retarding the timing so much as to keep it from detonating too early in the combustion cycle and is probably sacrificing a good chunk of power while using a lot more fuel than needed so i tried a few tanks of 95' never going back to 91 :p car runs much smoother, gets about 50-75km more on a tank of petrol and has a **** Load more power off the 95 octane fuel according to the Toyota guys my car being a jap import is most likely programmed to run on 100 Octane Fuel and the nearest place with 98 is Christchurch and thats a bit far just for a tank of petrol. wratterus: you say you have a SR20DE? Google Says they have a 9.5:1 Compression ratio so 95 octane fuel might not have much affect on it BUT i say give it a try and if it runs better and cheaper then it might work out better - plus a 9.5:1 Compression ratio opens a door to a possibility of some light turbo charging :drool We haven't got 98 in Nelson either!! :dogeye: I have been onto BP several times, but they won't give a reason as to why they won't bring it here. I believe BP was going to get 98 to every service station fronting onto a state highway - the one in Nelson fronts onto State Highway 6 (haven Road). Seems to fit the bill to me.... :illogical Aw well. Thats what I reckon too - the cars are designed to run on 100 octane - sure they've probably been tuned for less, but if you do live somewhere where 98 is available - it seems the logical thing to do to use it. Yep - My car does run a heap better on 95 than 91. And I found the same economy increase you noticed. The option to tubrocharge is sitting there begging...but the way fuel costs are going... :groan: |
wratterus (105) | ||
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