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Would someone please correct me if I'm wrong here. This is what I've gathered from what I've read in regards to higher-octane feul.

If I’m not mistaken, I do not believe that higher octane fuel alone creates much in the way of RWHP… Again, someone please correct me if I’m wrong here, but I believe that higher octane fuel is used primarily as a precautionary measure more than anything else. As far as I know, the only thing that using a higher octane fuel will do is lessen the likeliness of detonation occurring (higher octane rating = slower burn rate = less detonation).

Therefore, in the case of forced induction engines, the increase in RWHP most often associated with higher octane fuels doesn’t necessarily come from the fuel itself, but from the fact that you can run higher boost levels with a higher octane fuel than you could with a lower octane fuel. So, an increase in the boost level, not necessarily the fuel itself, is responsible for any dramatic increases in RWHP.

Likewise, in the case of naturally aspirated engines, higher octane fuel only helps to prevent detonation and offers very little in terms of increased RWHP.
 

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yes, higher octane fuels make it safer to run higher boost levels but on supras they have something that detects detonation which then retards the timing. so if you have higher octane it won't detonate which then will not retard the timing as much which will give you more HP. i think. correct me if i'm wrong.
 

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white95supra said:
yes, higher octane fuels make it safer to run higher boost levels but on supras they have something that detects detonation which then retards the timing. so if you have higher octane it won't detonate which then will not retard the timing as much which will give you more HP. i think. correct me if i'm wrong.
Well, with that understanding all higher octane fuel will do is give you more reliable HP, not more of it, right?

I guess what I'm trying to say is that higher octane fuel is not a "power adder" in the same way boost is.

However, I'm by no means an expert here. :D
 

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Lots!!!! I did a Gtech which shows simliar results as the real dyno same night same wind same everything within an hour from 92 octane - 50% 100 octane 76 & 50% 92 octane. I believe i got 50-60 rear wheel HP. I swear it's true i just put some in tonight i pull in 3rd gear like I do damn near in 1st gear.
I am BPU .......... FOR NOW!


make sure you reset the ecu. You'll notice if you did it correctly because your car will idle really low for the first few revs or so.
 
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