91 or 93 octane??
#3
Shock and Awe
Originally Posted by 23109VC
does the RX8 perform as well on 91 as it does on 93+?
does heat affect the car much?
does heat affect the car much?
#5
on my current car switching from 91 to 93 nets about 20 WHEEL hp. gas is a killer on my S60R. little turbo engine with knock sensitivity...
also, heat is ak iller. the car loses probably 40hp in 80+ degrees.
also, heat is ak iller. the car loses probably 40hp in 80+ degrees.
#7
Registered
We generally have 92 here and some stations have 91. I haven't seen a station in my area with 93 or higher. I haven't noticed a significant decrease in my car due to heat, but I do notice one when its near freezing and below. Then it really drinks up the gas and has a feeling of less power. It just feels like it is trying much harder than it does when it is warmer.
#8
Seriously.. FML..
Originally Posted by 23109VC
on my current car switching from 91 to 93 nets about 20 WHEEL hp. gas is a killer on my S60R. little turbo engine with knock sensitivity...
also, heat is ak iller. the car loses probably 40hp in 80+ degrees.
also, heat is ak iller. the car loses probably 40hp in 80+ degrees.
#9
Seriously.. FML..
Originally Posted by BunnyGirl
We generally have 92 here and some stations have 91. I haven't seen a station in my area with 93 or higher. I haven't noticed a significant decrease in my car due to heat, but I do notice one when its near freezing and below. Then it really drinks up the gas and has a feeling of less power. It just feels like it is trying much harder than it does when it is warmer.
#11
Out of NYC
iTrader: (1)
Originally Posted by BunnyGirl
We generally have 92 here and some stations have 91. I haven't seen a station in my area with 93 or higher. I haven't noticed a significant decrease in my car due to heat, but I do notice one when its near freezing and below. Then it really drinks up the gas and has a feeling of less power. It just feels like it is trying much harder than it does when it is warmer.
Heat kills everything.
#12
Registered
I'm aware of that, but the colder it gets outside, the worse it does also. This current tank of gas I've gone through 1/4 of a tank so far, and it is 20 miles behind it's usual spot for my "winter" mileage range. If it continues at this pace I may hit 18 if I'm lucky. Otherwise I've been getting mid 19s to mid 20s. It's been around freezing and below this whole tank, with our little storm and all. Last night it was 16 degrees when I got home. When I left work it was 21. It took between 5-6 miles before my needle hit it's "warmed up" spot on the temperature gauge, where it's usually fully warm by the time I get to the end of my road (1.7 miles) even in our cold temperatures. On take off the car feels a little sluggish to get going, but when it warms up to 40 and above, it feels just fine. I don't think Bella likes this cold. I already know she doesn't like the gas.
#13
Registered
iTrader: (2)
When it gets below 70 hear in the winter I can use 89 octane. In the summer when it's 125+ I can only use 91 octane and still I get pinging if the car idles for more then 3-5 minutes and you push on the pedal to accelarate. I wish we had 93 octane.
I haven't noticed a difference in 89 and 91 in the performance end of it. Just the ping end of it.
I haven't noticed a difference in 89 and 91 in the performance end of it. Just the ping end of it.
#14
FULL FRONTAL ...downforce
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If you have FI in your car, it might make a bit of difference.
but if you want better fuel performance with FI, get 100+ octane.
With NA engines, it shouldn't do much.
but if you want better fuel performance with FI, get 100+ octane.
With NA engines, it shouldn't do much.
#15
Merchant Of Pace
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Originally Posted by voodootrip
i don't have much of a choice since the highest pump gas we have is 91..
Why is 93 so hard to find in Cali?
#16
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Originally Posted by BunnyGirl
I'm aware of that, but the colder it gets outside, the worse it does also. This current tank of gas I've gone through 1/4 of a tank so far, and it is 20 miles behind it's usual spot for my "winter" mileage range. If it continues at this pace I may hit 18 if I'm lucky. Otherwise I've been getting mid 19s to mid 20s. It's been around freezing and below this whole tank, with our little storm and all. Last night it was 16 degrees when I got home. When I left work it was 21. It took between 5-6 miles before my needle hit it's "warmed up" spot on the temperature gauge, where it's usually fully warm by the time I get to the end of my road (1.7 miles) even in our cold temperatures. On take off the car feels a little sluggish to get going, but when it warms up to 40 and above, it feels just fine. I don't think Bella likes this cold. I already know she doesn't like the gas.
#17
Power!!
I use 89 and it works fine. I also don't live in the Utah desert though. There are some other more technical threads around here about octane. Search and you'll find them.
Your gas mileage goes down in the colder weather because the cold air is more dense so to maintain the same fuel air ratio the computer injects more fuel. It also means it makes more power. That's the same premise as using an intercooler on a Forced Induction car.
Your gas mileage goes down in the colder weather because the cold air is more dense so to maintain the same fuel air ratio the computer injects more fuel. It also means it makes more power. That's the same premise as using an intercooler on a Forced Induction car.
#18
Registered
Originally Posted by shaunv74
Your gas mileage goes down in the colder weather because the cold air is more dense so to maintain the same fuel air ratio the computer injects more fuel. It also means it makes more power. That's the same premise as using an intercooler on a Forced Induction car.
#19
Seriously.. FML..
Originally Posted by Easy_E1
When it gets below 70 hear in the winter I can use 89 octane. In the summer when it's 125+ I can only use 91 octane and still I get pinging if the car idles for more then 3-5 minutes and you push on the pedal to accelarate. I wish we had 93 octane.
I haven't noticed a difference in 89 and 91 in the performance end of it. Just the ping end of it.
I haven't noticed a difference in 89 and 91 in the performance end of it. Just the ping end of it.
#20
I've run 87 since I bought the car. 93 has shown no or maybe less performance/mpg for me. There are a lot of threads on this issue but if you don't experience pinging with 87 then go with it.
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