OCTANE: Why 91 and not 87?

[SROak]

Can someone explain why we need to put 91 gasoline in the GX550 while the Toyota Tundra only requires 87? These both have the V6 twin-turbo engine, right?
If this is simply because the GX550 is tuned for 91, is there a replacement chip that can tune the engine to run 87 gasoline?

The price difference here in California can be significant.

 

[Jesse H]

Because Lexus. Interestingly enough, the Toyota actually makes more power than the Lexus but uses lower octane.

There are some differences between the two as the GX does have smaller turbos which would create and deliver power differently. There are tunes out there for 87. I haven't gotten around to it yet, since it's my wife's truck, but I'm planning on the 93 tune which should yield a noticeable difference in power.

 

[SROak]

There are tunes out there for 87.

Do you have any links for the 87 octane tune for GX550?

 

[munkeeboi]

Do you have any links for the 87 octane tune for GX550?

Here you go.

No major power gains with the 87 tune...just allows reliability with 87 pump gas

You can follow this thread for more info. go to post #120 for tune differences

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