Premium or regular?

Only if you want to replace the engine. 1990-1995 300ZX N/A has 10.5 to 1 compression ratio which dictates the use of good gas. Read the manual about doing this, it has many precautions about using regular fuel. You can get away with it for a little while until you smoke a piston.

Bad idea. You bought a hypo car with high compression. Using regular gas is asking for damaged rod bearings, rings, pistons etc. Also you'll lose MPG so the savings aren't as great as you think.

On Mon, 26 Apr 2004 13:39:07 GMT, John Sheahan snipped-for-privacy@onemain.com wrote: > I have a 1995 300ZX and I have been putting Premium in it since I bought it, > but since gas prices have spiked big time, I was wondering if it would be > okay to put some regular unleaded in it or even mid-grade??

I use Regular gas almost 1 year with my 93' 300ZX NA. There is nothing problem but the hp is lower than using Premium gas.

And, I heard that the Z can fit Regular gas because the computer will re-calculate for low octan. Of course nobody recomend to use Regular with Z.

But I understand the gas is too expencive now.... :( That's why I use Regular now.....

Sorry my Z!! Hide

Too expensive? Try £4/gall in the UK! OK so it is full size UK gallon so that's near £3.33/US gall or $5.89/US gallon.

If you can't afford the gas you can't afford the car - sell it someone who can.

The ECCS detects low grade gas by the knock sensor detecting the start of detonation (very bad). Every time you run it, it starts off on the high octane map, hears a few knocks that are killing your engine and then it switches to the low octane fuel and ignition maps which retard the timing to reduce power. As retarded timing causes the engine to run hot it adds lots of fuel to cool it.

On Mon, 03 May 2004 19:00:18 +0100, Peter Hill snipped-for-privacy@nospam.demon.co.uk> wrote: > Too expensive? > Try ?4/gall in the UK! OK so it is full size UK gallon so that's near > ?3.33/US gall or $5.89/US gallon.

US$2.40/galon now (in USA) around my home.

Yeah.... Actually I sold my Z today. I'm very sad but it's better for my Z. I couldn't feed good meal to my Z. :(

I see. And I agree your message. Actually I had some knocks between 1500 to 2000 rps. My Z was telling me that was very bad meal.

But, actually Japanese mechanic(I'm Japanese) said, that's not very bad. But you can't get max power with your Z. Of course they don't recommend to feed Regular gas. But the Z can adjust for Regular gas mode into computer. I was hopping(?) them, so that's why I did.

And, of course I don't recommend to feed Regular gas to all of Z. If you really love your Z. ;) Or as you said, you should take over your Z to someone like me...

Thanks. And the Z is forever!! Hide

He's wrong..

On Mon, 03 May 2004 20:02:11 -0400, Steve T snipped-for-privacy@yahoo.com wrote: > > But, actually Japanese mechanic(I'm Japanese) said, that's not very bad. > >

oops....

Hide