bowtieman81

iTrader: (35)

The local FS station sells turbo blue 100 octane (unleaded). I am wondering what kind of power/boost gains I could see on my setup (stock 10:1 compression) versus using 93 octane. I have seen a lot of guys make real good power with 110+ octane, but not much with 100 octane.

2000 Tran Zam

iTrader: (2)

it will only help you not detonate if you are already detonating. Unless you increase boost or timing, no power gains will be made.

The reason you run higher octane is to increase timing/boost. by running the higher octane, it allows you to create more pressure without pinging (up to a certain point).

bowtieman81

iTrader: (35)

Ya, I know that I need to increase boost/timing. Maybe I should have worded my post differently. I am just asking what an extra 7 octane will gain when I do up the boost/timing.

Also, would 10 psi be doable on 100 octane?

cablebandit

iTrader: (37)

harlan ran 10pis on a stock motor/incon car a long ago with race gas but i do not know what octane....put the 100 in and slowly easy up the boost and see if you get any knock.

Avengeance

iTrader: (4)

10psi is doable on 93.... with the right tune. 10psi on 100 is easier then on 93 and you can run a more agressive tune.... thus more power. How much power? Who knows... different cars with different combos will make different power.

Make sense?

2000 Tran Zam

iTrader: (2)

well just to give you an idea, look at my sig between the differences in power/boost and octane.

pump gas i ran 13.5 lbs, around 16.5 lbs or so i think on 101 oct.

Beaflag VonRathburg

iTrader: (176)

Fill her up with the 100 octane. Then slowly up the boost and change the timing. Monitor your KR and when you start to see some back it down a little to keep it safe. Not exactly the safest way to do things, but it works. The power gains would hard to estimate, but it will be a very noticable gain.

bowtieman81

iTrader: (35)

Now that is what I was looking for. Basically you picked up 100 rwhp by going to 101 octane, and upping the boost/timing.

So me being a stock engine I could probably expect a 50-60 rwhp gain

2000 Tran Zam

iTrader: (2)

what size turbo? different cam or stock cam? I would guess approx 40-60 depending on conditions, but remember, the higher you go closer to 600rwhp, the more room for error you leave in saying bye bye to your stock block.

Im not sure if it was the pistons or connecting rods that let go at around that power, but even with a safe/conservative tune your running on borrowed time.

I would say for comfort sake, dont go past 550 rwhp for an all the time tune.

JMO

Edit: i see your running a t76...

you dont need to run too much boost with that turbo to get decent numbers. If your on the stock motor, expect your heads to be the least efficient.

but at 10:1 or higher CR, i wouldnt run more then 4-6 lbs on pump gas, with conservative timing too.

Beaflag VonRathburg

iTrader: (176)

Around those numbers the ringlands on the pistons start to go.

bowtieman81

iTrader: (35)

Maybe, 99SS-T ran 650 rwhp on his stock shortblock for some time. I would agree that it won't last forever like that.

I am shooting for about 525 rwhp, and safely. I figure I can get 475 rwhp out of my setup on 93 octane safely, so I am hoping with 100 octane it will make about 525-530 safely.

Beaflag VonRathburg

iTrader: (176)

I'm not sure of the exact number area of where the ringlands start to go. Some could go out on yours at 450hp and someone elses could go out a 650hp. Every car is different. That's why getting the tune spot on is so important if you're trying to push the limits or just wanting a reliable fast DD.

Got Me SOM

iTrader: (2)

It doesn't matter what gas you have in your car, your ringlands/stock pistons/rod bolts are the weakest link. keep power conservative until you can afford a forged block. its not worth risking damage to your block trying to push out a higher number with a ticking time bomb