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 VP X-16 
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Joined: Sat Mar 16, 2013 7:58 am
Posts: 76
Has anybody used Vp X-16 race fuel? It is a little cheaper than C-14. I am useing C-12 now. My fuel supplier asked me if I would try some to see if it works and maybe he will keep it in stock. Bob J


Sun May 08, 2016 8:56 am
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Joined: Fri Feb 08, 2013 5:50 pm
Posts: 2303
You can look at VP's fuel specs at the link below. C12 gets my vote up to about 14-14.5 to 1. RVP and vaporization specs are better. X16 is a little different than C14 but should run similar when jetted correctly. RVP is close, with C14 the vaporization curve is tighter, X16 has a larger range starting a little earlier but finishing a bit later.

http://www.vpracingfuels.com/master-fuels-table


Sun May 08, 2016 9:56 am
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Joined: Sat Mar 16, 2013 7:58 am
Posts: 76
Mark,
I have looked at VP's website. I am not real sure what is good and what is no-good, as far as all those specs go. Wish somebody could explain it in simple person English. Bob j


Sun May 08, 2016 11:22 am
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Joined: Sat Mar 16, 2013 7:58 am
Posts: 76
I finally got to try the X-16 fuel from VP. It seams to be very forgiving as far as engine temp goes. C-12 likes to leave the line with a 170 degree engine temp. C-14 likes a cooler (150 degree) engine temp. I bought some C-14 because my supplier was out of X-16. The X-16 really did not care if I left the line at 150 or 170. Most of the day Sunday I was staging the car at 165 degrees. Had a late round bye run so I staged at 150 degrees. The car ran the same number all day. I did not other tuning than engine temp. Bob J


Wed Jul 06, 2016 4:45 pm
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Quote:
The car ran the same number all day.
Your carb tuning skills are more responsible for that than the fuel.

:thumbr:


Wed Jul 06, 2016 7:47 pm
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Joined: Sat Mar 16, 2013 7:58 am
Posts: 76
Tuner, I think it was a combination of engine, converter, and chassis set up. Now, if I could stop the red lights late in the day. Bob j


Thu Jul 07, 2016 12:49 am
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