What octane fuel are you running?

[Nis Mo Z]

How much E85?

On the entire tank I do 2 gallons and the remaining 14.2/4 is 93. Or if I put in 4 gallons then 0.5 gallon of that must be e85, half a tank 7 to 1, and 3/4's of a tank 1.5 gallons of e85.

 

[zeroptzero]

Your dealer flat out lied to you. The Z is 91+ per the owner's manual. Putting 87 in would be just asking for reliability/durability problems.

Thanks for the reply, yeah they are not coming across as the most reliable people when it comes to this car, they are a bunch of dopes to be honest, thanks for the info and help.

 

[Nis Mo Z]

Wait, weren't you the one just complaining that the Trucontrol sucks on another thread?

I never said it sucked, only that many people have issues running it but the reason for their issue is simple, more boost and insufficient stock cooling is a recipe for disaster.

 

[KrackaC8]

Thanks for the reply, yeah they are not coming across as the most reliable people when it comes to this car, they are a bunch of dopes to be honest, thanks for the info and help.

You're welcome! At least car salesmen and service advisors are all the same/predictable regardless of boarders!

 

[5amp5on]

Your dealer flat out lied to you. The Z is 91+ per the owner's manual. Putting 87 in would be just asking for reliability/durability problems.

I cannot imagine the performance diff with 87, I felt it in the butt gauge on the one occasion I had to use 91 due to a road trip. Maybe it was in my mind but I don't think so.

 

[zeroptzero]

I cannot imagine the performance diff with 87, I felt it in the butt gauge on the one occasion I had to use 91 due to a road trip. Maybe it was in my mind but I don't think so.

I have a sneaky suspicion the dealer will give me the car with a tank of 87. I have zero trust in them.

 

[KrackaC8]

I have a sneaky suspicion the dealer will give me the car with a tank of 87. I have zero trust in them.

They absolutely will. Ask them to please not fill the tank.

 

[KrackaC8]

I cannot imagine the performance diff with 87, I felt it in the butt gauge on the one occasion I had to use 91 due to a road trip. Maybe it was in my mind but I don't think so.

A dealership put 87 in my C7 once, and I had to run 91 on a few occasions in both my C7 & C8... Horrible.

 

[zeroptzero]

They absolutely will. Ask them to please not fill the tank.

Good idea, I'd rather have no fuel than cheap fuel, lol. Or I will have to buy a bunch of octane booster

 

[jacksonmagnet]

Yup, I noticed after first fill that they had to of put 87 in mine, it was a very noticeable difference

 

[Zplz]

I cannot imagine the performance diff with 87, I felt it in the butt gauge on the one occasion I had to use 91 due to a road trip. Maybe it was in my mind but I don't think so.

I've always used 93 but tried various brands. When I first tried Shell 93 Nitro+, I noticed a difference with it. My Z purrs like a cat with it. A wildcat. I'm sure I wouldn't be very pleased with anything less than 93, in general.

 

[FSUZ33]

 

[GtownZEDD]

I use Costco 91 (Tier 1) since She’ll 93 has limited availability here. Bonus is Costco is $0.25/litre cheaper than other neighbouring gas stations.

 

[sarge]

I picked my Z up in NJ and ran 93 until 93 wasn’t available as I traveled west. My butt dyno doesn’t have anything but the car definitely ran smoother on 93.

We can only get 91 in western Colorado. Does anyone have any info on octane boosters or point me to some reliable info?

 

[KrackaC8]

I picked my Z up in NJ and ran 93 until 93 wasn’t available as I traveled west. My butt dyno doesn’t have anything but the car definitely ran smoother on 93.

We can only get 91 in western Colorado. Does anyone have any info on octane boosters or point me to some reliable info?

Best and most effective octane booster is going to be E85 if it's available near you. Adding 2 gallons to your tank will get you back to 93 and still be perfectly safe within the fuel trim parameters.

Additive type octane booster bottles from the auto parts store are expensive and hit or miss in effectiveness.