[JSH]

100 oct. LT4, 10.5:1 CR., 5400 ft. elevation; Callies/Callies/Diamond, etc., top ring gap is .023", 2nd ring gap is .025"

Originally Posted by Eldi Z

Guess you are talking about Pump gas E10 and I guess on an LT4 ?
Forged material + lower C/R allows for a leaner mixture.

The LT1 with its cast pistons and tight ring gaps is likely less forgiving, so a little richer for safety and yes I saw some calibrators feeling comfortable even with 0.86-0.87 and then are usually more careful with spark advance and boost.

[Eldi Z]

Originally Posted by JSH

100 oct. LT4, 10.5:1 CR., 5400 ft. elevation; Callies/Callies/Diamond, etc., top ring gap is .023", 2nd ring gap is .025"

Bullet proof then

[Joshinator99]

Originally Posted by Eldi Z

Bullet proof then

100 octane is far from bulletproof on that combo FYI. Any meth failure or unequal distribution can pop a head gasket or worse. Just my 2 cents.

[JSH]

I've heard that you can pop a head gasket on these things.

Originally Posted by Joshinator99

100 octane is far from bulletproof on that combo FYI. Any meth failure or unequal distribution can pop a head gasket or worse. Just my 2 cents.

[Joshinator99]

Originally Posted by JSH

I've heard that you can pop a head gasket on these things.

[Eldi Z]

Originally Posted by Joshinator99

100 octane is far from bulletproof on that combo FYI. Any meth failure or unequal distribution can pop a head gasket or worse. Just my 2 cents.

Would like to learn why there is a concern with forged material and 100 Octane. Relying on meth is not a proven safety measure, but apart from that, what did I miss?

[Joshinator99]

Originally Posted by Eldi Z

Would like to learn why there is a concern with forged material and 100 Octane. Relying on meth is not a proven safety measure, but apart from that, what did I miss?

100 octane is marginal on a high compression and high boost motor at a certain point. It would be ample octane on an 800 WHP car at his compression and maybe 13-14 pounds of boost. Different story at 20+ pounds and 1100 WHP.

That’s why a lot of big power cars rely on full E85 at a minimum since that is around 109 octane. Others go to One Ethanol S which is 112 octane and Ignite Red is 114.

[Eldi Z]

OK. Gotcha. I missed the 20+ pounds of boost.
Thanks.
BtW, if we are talking Octane #s, then how about adding %s of Toluene at 114 or Xylene at 117 Octane to a mix with 100?

[Joshinator99]

Originally Posted by Eldi Z

OK. Gotcha. I missed the 20+ pounds of boost.
Thanks.
BtW, if we are talking Octane #s, then how about adding %s of Toluene at 114 or Xylene at 117 Octane to a mix with 100?

Sorry I’m not familiar with those additives so I’m not well versed on their effects. Either way ethanol does a spectacular job of cooling the intake charge which is another big feature vs ant high octane race gas. Ethanol is really a cheat code in these engines regardless of boost level but it pays especially big dividends at big power levels.

[JSH]

I don't necessarily agree. King made 1031 on my old motor on race gas only with 20#, 24 deg, and .83 lambda. I believe the error last fall that popped it was tuning with meth rather than making a max effort (whatever that is) 100 oct. race gas tune and then spraying meth on it for added safety, which is what I'll do with the current build.

If Bandimere had stayed open so I could buy it, I would run 104 oct. I don't have a good place to store it.

Originally Posted by Joshinator99

100 octane is marginal on a high compression and high boost motor at a certain point. It would be ample octane on an 800 WHP car at his compression and maybe 13-14 pounds of boost. Different story at 20+ pounds and 1100 WHP.

That’s why a lot of big power cars rely on full E85 at a minimum since that is around 109 octane. Others go to One Ethanol S which is 112 octane and Ignite Red is 114.

[Joshinator99]

Originally Posted by JSH

I don't necessarily agree. King made 1031 on my old motor on race gas only with 20#, 24 deg, and .83 lambda. I believe the error last fall that popped it was tuning with meth rather than making a max effort (whatever that is) 100 oct. race gas tune and then spraying meth on it for added safety, which is what I'll do with the current build.

If Bandimere had stayed open so I could buy it, I would run 104 oct. I don't have a good place to store it.

You don’t have to agree, we’re all just sharing our opinions and experiences. But you’ve gone through a couple of builds in 2 years. Meanwhile I’m on the same drop in pistons, stock LT1 crankshaft and stock LT1 crank seal since 2019. So I’ll keep taking my chances with E85… (knocking on wood furiously lol)

[JSH]

Originally Posted by Joshinator99

But you’ve gone through a couple of builds in 2 years.

That often happens when you drive em like you stole em.

[Eldi Z]

Originally Posted by Joshinator99

Sorry I’m not familiar with those additives so I’m not well versed on their effects. Either way ethanol does a spectacular job of cooling the intake charge which is another big feature vs ant high octane race gas. Ethanol is really a cheat code in these engines regardless of boost level but it pays especially big dividends at big power levels.

No issues, I used these Octane boosters on small displacement 4 and 6 Cyl. Turbo imports a couple of years back.
If I had Ethanol available at the pump in my location ,then I would definitely opt for this route, but unfortunately I must get by with 98RON (93) pump gas for the time being.
Having to buy canisters of Ethanol and pour them into the tank each time is just too much effort and impractical for my needs.
So, at WoT boosting 7-7.5 Pounds @ 14.5 Deg. Spark and typically seeing 11.9-12.2 Gas AFR on my Ballenger AF-500 WB (and VCM logs).
Blower is a stock 2019 ZL1 blower + LT4 fueling E-to-End on an otherwise stock LT1 engine. Using a smaller 7.2" lower on an ATI balancer to keep boost in check. According to the Torque and Dynamic Airflow data in the logs, I should be right around 550-560 R-WHP and similar torque levels at ~ 3.5-4K-RPMs.
Thought about changing the stock paper air flilter to a K&N drop-in, but it may just be non effective and will likely not change anything, apart from a potentially less effective filteration.

[Joshinator99]

Originally Posted by JSH

That often happens when you drive em like you stole em.

Fair enough my friend. But 9.1 @ 153 isn’t exactly Sunday stroll in the park either lol…