For normal street use and NO racing, is it ok to run regular 87 octane gas in a 1999 Corvette?

You can but most likely there would be more engine ping and the PCM would drop down to the low octane timing table ( reducing performance) and stay there until it sees fuel was added to the gas tank

Best for saving fuel is to have PCM tuned so that no excess fuel is used such as COT for the CATs, lower but better timing in the high octane table and the knock tables tuned to reduce ping

For normal street use and NO racing, is it ok to run regular 87 octane gas in a 1999 Corvette?

It will probably run but it will not perform the same. I will never use regular gas on my Vette.

I also heard that in order to reset the low octane table to the original high octane table required disconnecting the battery cable to reset it.. Dont know if this is true but I reset mine every few months nonetheless.. 93 with Techron :thumbsup:

I also heard that in order to reset the low octane table to the original high octane table required disconnecting the battery cable to reset it.. Dont know if this is true but I reset mine every few months nonetheless.. 93 with Techron :thumbsup:

Removing the battery is a bad idea for when that is done even for a few seconds all the values the PCM has adapted/adjusted to, the fuel trim averages, and all the internal smog tests are flushed out of memory forcing the PCM to relearn them over time.

If the PCM drops into the low octane table and stays there as it assumes the excess knock is from bad gas.

The PCM resets to high octane table when the PCM sees at least 10% more fuel in the tank from the last time key off to key on.

I just use 93 its just my choice

These cars need the higher octane, I've heard people running the lower 87 but have also said they got ping's or other problems. I would stick with the high stuff. :cheers:

I also heard that in order to reset the low octane table to the original high octane table required disconnecting the battery cable to reset it.. Dont know if this is true but I reset mine every few months nonetheless.. 93 with Techron :thumbsup:

Since the PCM is constantly learning, resetting it doesn't really provide a long term benefit. The PCM will "learn up" to the high octane table if it doesn't detect knock after a period of time.

Frankly you can tune your car for 87 octane but the performance will be hindered. 87 is slightly faster burning and of course less resistant to knock so the tune needs to take this into account. You will have to put more tolerance into the tune as 87 octane gas varies a bit more than the premium 91-93 octane fuels.

Check HERE (http://www.toptiergas.com/)for more details about Top Tier suppliers.

For the difference in price it's not worth it. Poor performance, dirty injectors, poor gas mileage. I also heard that it will damage your oxygen sensor .

HIGH TEST ONLY In my C5

Run 87 in both my 83 and 03 no problems, have had the 84 about 5 years and the 03 about 2 the 03 averages around 30 mpg limited city and highway of course this is with a very light foot

Removing the battery is a bad idea for when that is done even for a few seconds all the values the PCM has adapted/adjusted to, the fuel trim averages, and all the internal smog tests are flushed out of memory forcing the PCM to relearn them over time.

If the PCM drops into the low octane table and stays there as it assumes the excess knock is from bad gas.

The PCM resets to high octane table when the PCM sees at least 10% more fuel in the tank from the last time key off to key on.


I didn't know that. So it's not a good thing when the battery is removed? Can it damage anything if done a lot?

Some of the aftermarket programmers allow for changing the octane used in your Vette. I believe that Hypertech allows this. I'm not sure about the Diablo tuner. Personally I would use at least 91 octane. It only cost 20 cents more a gallon. Whats 20 cents when your already paying $4.00 a gallon anyway. :patriot:

As much as I hate to with gas prices, I still run the best at the pumps

I've been running the regular stuff in for about 3 months and the car runs just fine. Heck the cheap stuff is now over $4.00 here. :mad5:

Absolutely not!! Don't you even think of putting that crap in your Vette!! Please don't!:willy_nilly:

Its the price you gotta pay if you want to drive a high compression vehicle. You don't drive around on liability only insurance policy do you? I run premium in mine as much as it pains my pocket to.

Nothing but shell v-power gas in my 01 vette. $4.14.a.gallon last fillup. Wouldn't think of using anything else. :cheers:

Best we can get is 91 octane here in California. Even then it's expensive by 10 cents over the mid range. I figure for 15 gals of gas that's all of a buck and a half and just not worth it. I drive 100 miles a day and just not for about 20 dollars a month going to screw anything up or take the risk. :patriot:

Padrino

Well it looks like Super is the only way to go. Can't blame me for asking with the high cost of gas. :nopity:

As much as you may hate paying for the "good stuff" I would continue to buy it if I were you. You are just punishing your engine with the cheap crap and you really are'nt going to save much $ in the long run with you maintenance from the cheap crap.

As much as you may hate paying for the "good stuff" I would continue to buy it if I were you. You are just punishing your engine with the cheap crap and you really are'nt going to save much $ in the long run with you maintenance from the cheap crap.

:iagree: No kidding! I even hat running odd ball company premium gas. Anyone run like Cost Co gas?

Gotta run the good stuff all the time!!:party:

The knock sensor will pull back timing to save the motor from pinging if you run regular fuel, but I wouldn't recomend it. What if you run regular fuel and the knock sensor is taking a coffee break :) Oh and you CA guys are fine running the Hypertech Premium fuel tune with 91 oct.

I run the good stuff and I put additive in the tank!!

I can't believe that someone would actually do this, not in a sports car!:cheers:

You know just this last weekend I messed up and was on the cell phone and put the "middle" stuff in the Vette and I think that so far everything is ok, but I wonder as I start to get to half way through this tank and closer to the end, how it will run then? Will I start to see the effects then? I will let you know!

I didn't know that. So it's not a good thing when the battery is removed? Can it damage anything if done a lot?

Removing the battery is not a good idea, other then what I mentioned about anything that is stored in RAM like fuel trim averages is lost but also all the internal EPA smog tests are defaulted to a failed state forcing the PCM to take up CPU process time to run all those tests again to get them into a complete state that an take multi days to do.
Also any stored error codes are erased blinding you to any problem with any module in the car.

Removing battery for a few seconds will not damage anything but if left off for a long time could cause security code or radio password to get lost and you have to know how to correct that.

No I continue to use the premium and I just don't go to many places just to try and keep the fuel bill lower!

never!! Only the good stuff for me!!

I run the good stuff and booster usually

In my experience my Vette will run like crap if I put anything other than the good stuff in her!

I plan on running only high octane gas in my 01. I understand that the low octane can cause carbon build-up and make your engine ping.

This is one of those times that I can seriously say if you cant afford the gas that the vehicle requires, you simply cannot afford the car. Right on the gas door of that or any other higher priced car it tells you to put premium in it as a minimum. They are giving you the most performance that they can with the available pump gas. You are obligated to spend the extra $2.00 at the pump to maintain that.

I think of my car as a woman....If I take here out to dinner at McDonalds, she is gonna act like it, but if I take her out for Filet Mignon.......watch out!

I think of my car as a woman....If I take here out to dinner at McDonalds, she is gonna act like it, but if I take her out for Filet Mignon.......watch out!

How true is this on so many levels!:cheers:

PS. Is it still good to run additive ever now and then?

Only The Good Stuff!!!!

Not to mention that crap will cause your fuel gauge to have problems like showing that you have no gas when you actually have a quarter of a tank. I tend to think that people who run lower tier gas in a car that the owner's manual requires a better grade really can't afford the car. Of course, that's just my personal take.

Not to mention that crap will cause your fuel gauge to have problems like showing that you have no gas when you actually have a quarter of a tank. I tend to think that people who run lower tier gas in a car that the owner's manual requires a better grade really can't afford the car. Of course, that's just my personal take.
:iagree: This is the single most important thing right there, using Top Tier fuel. If you can not find a Top Tier Fuel retailer in your area, start making it a ritual to add Techron as part of your fill up procedure.

I use premium because of my tune AND GM recommends it on a stock Vette to boot...

:iagree: This is the single most important thing right there, using Top Tier fuel. If you can not find a Top Tier Fuel retailer in your area, start making it a ritual to add Techron as part of your fill up procedure.

I use premium because of my tune AND GM recommends it on a stock Vette to boot...

I use Techron quite often! Great stuff!:party:

Only the good stuff, need this thing running as good as I can get!

I am starting to do an additive once a month and see if this makes a positive effect!:cheers:

Its the price you gotta pay if you want to drive a high compression vehicle. You don't drive around on liability only insurance policy do you? I run premium in mine as much as it pains my pocket to.

:iagree: Only the good stuff for the bitch....