octane in my svx

[Red94Svx]

What will happen if i just put regular gas in my car vs. 92 octane?
Thank you :)

[ZMan]

http://lmgtfy.com/?q=What+will+happen+if+i+just+put+regular+gas+in+m y+car+vs.+92+octane%3F+

[lhopp77]

I own or have owned 7 and have never used anything but regular gas in them.

Lee

[jlhamblin]

What will happen if i just put regular gas in my car vs. 92 octane?
Thank you :)

I've tried 87 oct, & 89 ethanol blend & 91
87 ran terrible, car surged & shifted weird
89 ran better but got terrible mpg's, like 19=20
91 was fine, 24.5 mpg run good
waiting to try 110 from race car just for fun !!!
let me know how you do

[svxfiles]

I own or have owned 7 and have never used anything but regular gas in them.

Lee

Keep THAT up Lee and you will just blow the head gaskets right out of them!:eek::eek::eek:

:p

Just kidding.:o

[1986nate]

My SVXi don't even like the "required" 91 octane, they run better and get much better mileage on 93 and still good when I have to use 92. Almost all local stations here have 93 octane for premium.

[subbieatnz]

I used to use 97 in mine. Sometimes I would use 95 if I couldnt get 97.

[LetItSnow]

I used to use 97 in mine. Sometimes I would use 95 if I couldnt get 97.
I wish I had such troubles. :( We used to be able to get 94 around town, but the best I can find is 93 now.

[92 SVX]

I used to use 97 in mine. Sometimes I would use 95 if I couldnt get 97.

I wish I had such troubles. :( We used to be able to get 94 around town, but the best I can find is 93 now.

While it looks impressive subbieatnz is in new zealand and they rate the octane differently, or should I say the USA rates it differently because most of europe also rate differently then we do.

I read an article about it, if you look at the gas pumps they should say octane R/M method I believe they only use R method. The higher number they get is still about equal to the gas we get.
This is not an actual comparison but I would say there 97 is about equal to our 93-94 rating.

[zymmer4]

I have to use premium to make mine run well..I had to put a half tank of Plus in once..It didn't run smoothly .

[92 SVX]

I used to use 87 or 89 it ran fine I lived in ND where there was only 87, 89, and 91 available and the price difference was way too much for premium, now I live in jax fl and 93 is availabe and only about 20 cents difference I notice better power and way better fuel economy using 93. I dont have numbers though.

[taylorbr]

The SVX only uses high octane to prevent detonation because of its compression ratio. I would think that with the age (and mileage) most of the fleet is at that lower octane fuel could be used without the engine having to pull timing (and subsequent loss of power and efficiency).

[Cam]

Most engines probably have suffered from a slight compression loss, like stated above. Also, the air density matters as well. High elevations will take less air into the cylinder making the car run rich. So high elevation cars should run fine on slightly lower octanes as well.

[Huskymaniac]

Maybe we should run regular and add Toluene or Xylene. It would keep the fuel system clean and boost the octane.

[Cam]

I wouldnt do that without buying some seals and dumping them into a bucket with those chemicals. Probably not a good idea. I heard of someone using acetone to get better fuel economy. But that's the kind of thing you do with a rental vehicle.

[oab_au]

Most engines probably have suffered from a slight compression loss, like stated above. Also, the air density matters as well. High elevations will take less air into the cylinder making the car run rich. So high elevation cars should run fine on slightly lower octanes as well.

I think the Mass Air Flow sensor, will take care of that.:)

Harvey.

[Cam]

I think the Mass Air Flow sensor, will take care of that.:)

Harvey.

To a certain degeree. This is just speculation, but the injectors can only open and close so quickly. There is a point where they would not help but run rich. (that could possibly be a very extreme situation, though)

[svxfiles]

OK,
Today's gasoline is not the same gasoline that we had back in 1991-1997!:mad:
The octane might have close to the same numbers, BUT it now has less BTUs, thanks to ethenol!:mad::mad:
Ethenol=alcohol
“On a volumetric basis ethanol yields 83,910 BTU’s/ gallon of thermal energy from combustion.
Gasoline yields 124,800 BTU’s/ gallon of thermal energy."
It takes more fuel to get the same power out of a gallon of today's C.R.A.P.
Citizen/Required/Alcohol/Petrolium!

Sure, adding alcohol lowers combustion temperatures, but the power falls off.
If I wanted less power I'd drive a Neon! Or a Taurus or some other piece of crap.
Cheaply Replicated Automobilelike Product!:mad::mad::mad:
And now THEY are raising the ethenol to 20%!:barf:
Comrade, Reality Ain't Pretty!

[92 SVX]

Maybe we should run regular and add Toluene or Xylene. It would keep the fuel system clean and boost the octane.
I have done that, its cheaper to buy premium. Both Toluene and Xylene are over $15 per gallon, even more expensive if you buy smaller quantities. To get even 1 octane rating higher you need 1 gallon per tank
I wouldnt do that without buying some seals and dumping them into a bucket with those chemicals. Probably not a good idea. I heard of someone using acetone to get better fuel economy. But that's the kind of thing you do with a rental vehicle.

Toluene and Xylene will not harm your seals, they are already in gasoline Acetone however could in large enough quantities though I have used that in small doses with minimal improvements so I stopped.


http://www.gnttype.org/techarea/misc/octaneexplained.html

This is a very good write up of octane and toluene

[Bonestock]

I run mid grade nearly all the time in my car and only run premium once every 3 fill ups if I remember. :rolleyes: Unless you are running the car hard or loading (high load, low RPM) its not gonna matter IMO.

YMMV

BTW this is coming from a guy that was fanatical about buying only Shell v-power and running only the finest PAO oils. All that additional expense added up to NOT, NADDA not a damn thing except less $$$ in my pocket.

[1986nate]

I have proven that my gas mileage will suffer under highway cruising with lower octane. I got 30.9 with 93 octane with 10% ethanol blend from here to about Indianapolis where they had 92 octane, got about 29.5 so slight changes in driving conditions could apply there, but every time that I have put 91 octane in , either with or w/o ethanol mix, the mileage drops to about 24-26 hwy mpg's...

These were all on my laguna fwd SVX. Considering 93 octane is generally found here for 16-20 cents more than regular, I'll stick to 93 octane.

[Gamesy]

whats everyone's opinion on octane booster to help offset the ethanol?

[92 SVX]

whats everyone's opinion on octane booster to help offset the ethanol?

be careful and do your research on the booster, I believe, IMHO most are garbage.
I have tried the NOS which is supposed to raise octane about 60 points, or i think about 3 octane though I could be wrong on that number. could be 6 octane anyway I think it does what its supposed too. not a bad price at just over $10 a bottle.
Here is a good place too look
http://www.octane-booster.com/
And it looks like I was mixing nos regular and nos racing regular is 30 points or 3 octane and racing is 60 points or 6 octane.

Here is a great place to start researching and learning
http://www.europeancarweb.com/tech/0503ec_octane_boosters_tested/index.html

[LetItSnow]

While it looks impressive subbieatnz is in new zealand and they rate the octane differently, ...
I figured as much, but taken out of context, it's still a nice wish. I've got a legitimate reason. ;)

Toluene and Xylene will not harm your seals, they are already in gasoline Acetone however could in large enough quantities though I have used that in small doses with minimal improvements so I stopped.
Naturally, this leaves me wondering about Torco's additive, which should be good for a solid kick in the pants.

[StatGSR]

whats everyone's opinion on octane booster to help offset the ethanol?

dude, ethanol is the octane booster... Ethanol has a octane rating of about 120...

I just prefer to run non-ox in anything that required premium (no ethanol added 91)


Also increasing the octane doesn't increase the energy in fuel, it prevents it from detonating
The required octane for a car is based on the compression ratio of an engine, the CR essentially determines the efficiency of an engine so unless you change it, (with new pistons or adding some form of forced induction which effectively changes the CR of the engine as it builds boost), then there is no reason to increase the octane of your fuel. reversely, that's why higher octane race fuels or ethanol (E85) works so well on turbo vehicles, you can raise up your boost substantially while still preventing detonation<--Engine Killer


Also, Octane Ratings across the world...
http://en.wikipedia.org/wiki/Octane_rating

[92 SVX]

dude, ethanol is the octane booster... Ethanol has a octane rating of about 120...

I just prefer to run non-ox in anything that required premium (no ethanol added 91)


Also increasing the octane doesn't increase the energy in fuel, it prevents it from detonating


Also, Octane Ratings across the world...
http://en.wikipedia.org/wiki/Octane_rating

yes but ethanol has a lower btu, and octane booster with at least as high of btu if not higher then gasoline is much more preferable.
Its too bad ethanol is added to all grades of gasoline in most places, including where I live. means if it were possible to strip the ethanol out we would most likely be left with a lower octane grade of fuel. In the case of the 93 octane it might be 91.8 or something, the actual number I do not know.

[StatGSR]

I'm very aware of that, also please see my edit.

I'm just saying, its not a higher octane that you need to have a greater energy density in your gasoline.

Like i said, the best you can get is non-oxygenated gas if you can find it near you.


Adding ethanol takes crap gas to an acceptable level that won't destroy an engine, but on the other hand, doesnt create as much energy when burnt either.

[kwren]

OK,
Today's gasoline is not the same gasoline that we had back in 1991-1997!:mad:
The octane might have close to the same numbers, BUT it now has less BTUs, thanks to ethenol!:mad::mad:
Ethenol=alcohol
“On a volumetric basis ethanol yields 83,910 BTU’s/ gallon of thermal energy from combustion.
Gasoline yields 124,800 BTU’s/ gallon of thermal energy."
It takes more fuel to get the same power out of a gallon of today's C.R.A.P.
Citizen/Required/Alcohol/Petrolium!

Sure, adding alcohol lowers combustion temperatures, but the power falls off.
If I wanted less power I'd drive a Neon! Or a Taurus or some other piece of crap.
Cheaply Replicated Automobilelike Product!:mad::mad::mad:
And now THEY are raising the ethenol to 20%!:barf:
Comrade, Reality Ain't Pretty!

As usual, SVXFILES is right on. The feds never get anything right. The introduction of 10% ethanol reduced the gas mileage by 10%. 20 % ethanol will reduce the mileage by 20%.
Translation... ethanol is totally worthless! I believe ethanol is also disaster for our engines as well. :(

Keith:cool:

[jeffs92svx]

I use 93 in every car I drive. I get better mileage, better power and a cleaner burning engine.

[StatGSR]

Translation... ethanol is totally worthless!

actually i couldn't disagree more.

while i don't appreciate what it does when mixed with for pump gas, E85 at a pump has huge benefits for making little engine's make gobs of power.

in my town, all the guys with the fastest turbo imports are all corn fed. race fuel octane levels and prices cheaper than gas is pretty sweet, only down side for most of those cars is they are not so good for road tripping across the country any more and obviously they get pretty lousy mpg, but for what they use em for there really isn't a better fuel around.

honestly, if a manufacture built an engine to run purely on ethanol (not this BS idea of flex fuel) those would probably some of the most impressive motors on the market, stuff like 1.3 liter I4s, turbo, direct injection... could still = 200+hp and over 30+ mpg

sorry, i just don't believe e85 is the worst thing ever when use appropriately.

[oab_au]

To a certain degeree. This is just speculation, but the injectors can only open and close so quickly. There is a point where they would not help but run rich. (that could possibly be a very extreme situation, though)

Yes I can see you are just speculating.:)

Yes the injectors take about 1.2 mil sec to open and about 2 mil sec to close. This is only affected by operating voltage and fuel pressure.
No they won't get to " a point where they would not help but run rich". They have no trouble opening and closing to inject the small amount of fuel at idle.

The system of a MAF sensor reading the mass amount of air, compensates for air pressure, temp, and humidity.

Harvey.

[kwren]

actually i couldn't disagree more.

while i don't appreciate what it does when mixed with for pump gas, E85 at a pump has huge benefits for making little engine's make gobs of power.

sorry, i just don't believe e85 is the worst thing ever when use appropriately.

Actually the comment from me was about reality... the %age in the pump that effects all of us in our daily lives.

If the government ever forces the manufactures to resort to making engines that would do good with this, the fuel would cost $30.00 a gallon. It may cost us that much now counting our tax money that subsides it and the increased cost of the veggies we have to buy for food.:)

Keith:cool:

[Brian]

I have no problem using Regular in the winter. But when it's warmer out and I use it, my engine runs rough, surges and drops power, and occasionally even quietly stalls.

[dcarrb]

Gospel truth from one feeble mind: Higher-than-spec octane in a stock engine, as obtained from 93 octane premium-grade fuel, "boosters" or racing fuel, and solvents such as toluene, xylene, acetone, methanol, whatever, offer no practical motoring benefit. None.

It's pretty simple: Run the cheapest, lowest octane fuel that doesn't obviously impede your car's overall performance and economy.

dcb

[zymmer4]

actually i couldn't disagree more.

while i don't appreciate what it does when mixed with for pump gas, E85 at a pump has huge benefits for making little engine's make gobs of power.

in my town, all the guys with the fastest turbo imports are all corn fed. race fuel octane levels and prices cheaper than gas is pretty sweet, only down side for most of those cars is they are not so good for road tripping across the country any more and obviously they get pretty lousy mpg, but for what they use em for there really isn't a better fuel around.

honestly, if a manufacture built an engine to run purely on ethanol (not this BS idea of flex fuel) those would probably some of the most impressive motors on the market, stuff like 1.3 liter I4s, turbo, direct injection... could still = 200+hp and over 30+ mpg

sorry, i just don't believe e85 is the worst thing ever when use appropriately.

What compression ratio are they running..How much boost is the turbo running..what valve timing are their hot cams doing? Like comparing apples to donuts, hotrod turbos to standard spec passenger cars. straight gasoline(no crappy ethenal) is a good bet for lots of BTUs' from most engines.

[Pierre-Olivier]

I use to SP95 RON for my SVX (91 AKI in the United States).