91 or 93 tune?

[Soulja4187]

So I'm ready to pull the trigger on getting the RTD since the Ngauge cant be used with the 2021 Mustangs. I definitely want the E85/Flextune which will be my first fuel option but as a secondary I'm not sure, read some stories of some guys having to add octane booster to their 93 to make sure that its around 93. I'm in South Florida so all we have is 93. What are the pros on getting a 91 tune and then putting 93 gas? Or can I just get 93 tune and just put 93 gas without having to add octane booster? Sorry for my ignorance. Thank you all.

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[WildHorse]

91/93 tunes are the same. The PCM will either add timing or not.

 

[Soulja4187]

91/93 tunes are the same. The PCM will either add timing or not.

Thanks!

 

[engineermike]

The factory stock tune will run it right into knock even on 93.

 

[Stephen@lethal]

So I'm ready to pull the trigger on getting the RTD since the Ngauge cant be used with the 2021 Mustangs. I definitely want the E85/Flextune which will be my first fuel option but as a secondary I'm not sure, read some stories of some guys having to add octane booster to their 93 to make sure that its around 93. I'm in South Florida so all we have is 93. What are the pros on getting a 91 tune and then putting 93 gas? Or can I just get 93 tune and just put 93 gas without having to add octane booster? Sorry for my ignorance. Thank you all.

91 and 93 are going to be pretty much identical honestly. If I were you, I would just stick with a 93 tune and go with a straight e85 tune when you are ready to play and just swap them out. Octane booster isn't really needed down here in south Florida, at least not that I've had to use. If you have any questions or would like to get a tune/device ordered, feel free to shoot me a message anytime. Lethalperformance.com

 

[WildHorse]

The factory stock tune will run it right into knock even on 93.

Hence why there's knock sensors.

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