I know our cars are octane limited from a power perspective, but at what octane are we no longer limited? For instance, E40 has an octane of 98, based on 105 for E85 and 93 with 10% ethanol.
I know some people run full E85 for the convenience and I believe the cooling benefits are met at the E40/50 range, but what of the octane? I would think most evaluations were probably done with race gas, and I don't think that's a direct comparison, especially if using leaded gas.
I am currently fueling limited to E40, but I was hoping to add a few degrees of timing and boost for some extra power and initially thought about adding some Torco or race gas, as 110 leaded is available at the pump here (more 110 leaded pumps than E85!). However, I discovered the metals used in Torco and leaded gas, have the opposite effect on alcohol based fuel, and in turn reduce octane, so that is out.
There are unleaded variants of race gas, MS109 for instance has an octane of 105. Mixing E85 and MS109 to an E40 mix would result in a 105 octane rating, but still have the 40% ethanol for cooling.
Has anyone tried this or have any technical downsides to it?
I know some people run full E85 for the convenience and I believe the cooling benefits are met at the E40/50 range, but what of the octane? I would think most evaluations were probably done with race gas, and I don't think that's a direct comparison, especially if using leaded gas.
I am currently fueling limited to E40, but I was hoping to add a few degrees of timing and boost for some extra power and initially thought about adding some Torco or race gas, as 110 leaded is available at the pump here (more 110 leaded pumps than E85!). However, I discovered the metals used in Torco and leaded gas, have the opposite effect on alcohol based fuel, and in turn reduce octane, so that is out.
There are unleaded variants of race gas, MS109 for instance has an octane of 105. Mixing E85 and MS109 to an E40 mix would result in a 105 octane rating, but still have the 40% ethanol for cooling.
Has anyone tried this or have any technical downsides to it?