Open Flash Header Discussion

[tomaszjanczak]

Originally Posted by pl1ght

Anyone have a Dyno of a 93 OFH + rest stock (drop in filter is fine) with stg2 OFH flash? I think ive read through every thread i could find and only saw 91 or e85 dynos.
Thanks!

93 octane tune is like 3 horsepower more than 91 octane tune at the top of the rev range. It's not a big difference between the 2, the power and torque curves should be pretty much identical.

[904FRSlow]

Originally Posted by tomaszjanczak

93 octane tune is like 3 horsepower more than 91 octane tune at the top of the rev range. It's not a big difference between the 2, the power and torque curves should be pretty much identical.

Is it just to save money then?

[2much]

some states have 91 octane and some states have 93.

[tomaszjanczak]

Originally Posted by 904FRSlow

Is it just to save money then?

Not sure you would be saving a lot of money using 91 vs 93 but where I live we only have 87, 89, 93. I remember Shiv once saying that he would prefer to name the tunes more aggressive and less aggressive instead of by octane ratings.

Some 93 fuels will knock on the 93 tune and I'm guessing some really good 91 octane might still be good for the 93 tune, who knows. It's a lot of factors. Data logs are the best thing to check when picking the tune. But using the 91 octane should be safe with any 91 or 93 fuel. (I use 91 tune with 93 fuel and haven't had problems)

[904FRSlow]

Anyone get their tracking info yet?

[2much]

Originally Posted by 904FRSlow

Anyone get their tracking info yet?

no

[200hp/tonne]

not yet

[Robert@Openflash]

The shipment has arrived at the ports and has cleared customs. Is schedule to deliver tomorrow. Once the shipment arrives we will be conducting QC and shipping prep. Everyone that has ordered the OFH should have their tracking friday at the latest.

If you have any questions. Email: sales@openflashperformance.com

Cheers.

Originally Posted by j_Zer0

Hi @Robert@Openflash,

Could you please share an update? Have you received the headers yet? OFH is my Christmas present to myself so it'd be nice to get it in time. Thanks a lot.

[mid_life_crisis]

Originally Posted by tomaszjanczak

Not sure you would be saving a lot of money using 91 vs 93 but where I live we only have 87, 89, 93. I remember Shiv once saying that he would prefer to name the tunes more aggressive and less aggressive instead of by octane ratings.

Some 93 fuels will knock on the 93 tune and I'm guessing some really good 91 octane might still be good for the 93 tune, who knows. It's a lot of factors. Data logs are the best thing to check when picking the tune. But using the 91 octane should be safe with any 91 or 93 fuel. (I use 91 tune with 93 fuel and haven't had problems)

General rule is that you can always use a better grade of fuel than what a tune or the manufacturer call for. The worst thing that will happen is that you'll waste money buying better than you need. Best thing that can happen is that you'll have a little insurance against a load of substandard fuel.

[2much]

Originally Posted by mid_life_crisis

General rule is that you can always use a better grade of fuel than what a tune or the manufacturer call for. The worst thing that will happen is that you'll waste money buying better than you need. Best thing that can happen is that you'll have a little insurance against a load of substandard fuel.

worst case is that higher octane burns hotter. your engine might run marginally hotter than it is designed to.

[mid_life_crisis]

Originally Posted by 2much

worst case is that higher octane burns hotter. your engine might run marginally hotter than it is designed to.

That's a myth. Octane is only a knock resistance rating, and nothing to do with energy. It is possible that the slower burn could cause valve issues if they are open long enough but the chances are ridiculously small. A modern high compression engine would be built to handle it anyway.

[Thorpedo]

Originally Posted by mid_life_crisis

That's a myth. Octane is only a knock resistance rating, and nothing to do with energy. It is possible that the slower burn could cause valve issues if they are open long enough but the chances are ridiculously small. A modern high compression engine would be built to handle it anyway.

Close. "It is possible that the slower burn could cause valve issues if they are closed long enough"

[mid_life_crisis]

Originally Posted by Thorpedo

Close. "It is possible that the slower burn could cause valve issues if they are closed long enough"

Are you sure? I thought the issue was that the slower burn could mean that burning fuel could get pushed past an open valve and burn the edge/back of it if the valve was timed for the faster burn of lower octane fuel.
The chances of that are slim though as who in their right mind would make such aggressive valve timing choices for low octane fuel?

[Thorpedo]

I shouldn't have responded that early in the morning. We are both wrong actually haha.

It causes issues when the exhaust valves aren't closed long enough. Aka there is still burn taking place when the exhaust valve opens and the gasses start to leave the cylinder.