What are you guys running in your cars? I would like to hear from the Protomotive guys in particular. I'm leaning towards the VP MS109E or the MS103.

See the link: http://www.vpracingfuels.com/vp_01_fuels.html#unleaded

All comments and recomendations are welcome!

 

I putting some 100 i today.

 

I usually run 93 this is the first time I'm trying the 100 octane.

 

VP MS 109 only. The bomb!

 

The MS109 or the MS109E?

 

It depends on the state. In CT I can only get 109e.

I recommend 103 if you have a pump gas tune and no way to increase boost and 109 is you have an ebc or if you are running one of our true race gas files.

 

really depends on YOUR tuning and amount of boost you run.

I ALWAYS run 100 octane at the track. not for hp as much as to prevent running lean and also keeps cylinder temps down (from what I am told)
on the street I run 93 but really never have any sustained boost will street driving.

my AFR's are right on the money with the Protomotive programing, and this is the key.

 

We get 109 in California. It keeps the car running cool, clean and quick.

 

Vp Ms-109.

 

VP109 is NOT 109 octane -- the name of the fuel is deceptive. In contrast to other VP fuel names which accurately reflect the R+M/2 octane rating, VP109 is actually 105 octane (R+M/2).

Before I switched to leaded fuels -- C16, then C12 -- I used to run Sunoco GT Plus, which is 104 octane (R+M/2). This Sunoco fuel is only 1 octane point less than VP109, but considerably less expensive.

Craig

 

Motor octane is always lees than research octane. The 109 is the research octane. I like the VP 109 because it is clear uncolored. sunco is also great fuel.

 

Other than VP109, VP names its unleaded fuels according to their r+m/2 octane rating (some of VP's race fuels have a name unrelated to the octane rating). For example, VP103 has a 103 r+m/2 octane rating . . . same for VP100, etc. For unknown reasons, VP elected to name its VP109 fuel according to its research octane rating, rather than its r+m/2 rating that VP uses for other fuel names. I personally think this is deceptive, as many people assume VP109 has a 109 r+m/2 octane rating -- many people purchase VP109, at a considerable premium, because they think its is 6 octane points higher than VP103, and 5 octane points higher than Sunoco GT Plus, when in reality, VP109 is only 1 octane point higher than GT Plus and 2 points higher than VP103 (using r+m/2 ratings). IMHO, VP109 should be called VP105, so as to reflect its r+m/2 octane rating, consistent with how VP names other unleaded fuels.

Craig

 

I just tried VP100 for the first time (1/3 tank) and I could already tell the differences (comparing with 91 in CA). For those that are considering, give it a try... you'll like it.

 

Thanks Craig! I run the Sunoco 94 in the car now and will look into getting a price on the 104.

 

What are the main differences between leaded and unleaded fuels? Did you see a big difference in performance between 104, C16, and C12?