Fuel

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Originally Posted by dawdaw

Well while building the car for STRICTLY for the track, highly consider the fuel and what your willing to spend. Every fuel has advantages disadvantages.

On a NA build lean towards a oxygenated fuel. Q16 makes good power but has MTBE in it and is harsh big time on fuel systems, E85 is oxygenated and makes good power, is dirt cheap, but has to be drained every couple months if it sits cause it attracts moisture and the moisture will eat fuel systems.

If you're just looking at a mild build in the 12ish region for static compression pump gas 93 will work, your cooling system, TUNING, and how much cylinder pressure you make based off the split in the cam, cam timing, ring selection, etc. I ran 93 on a 12.9 almost 13:1 motor but I switched to E85 and am looking forward to.hopefully some good results, or at least my tuner thinks so lol.

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The e85 is higher octane, so you'll be able to advance your timing more, as well as being less sensitive to the moisture in the air since e85 attracts moisture. The trade off is that e85 has less btu content that gasoline, so you need more of it to make the same power.

Not looking to change to e85 since I would have to change the fuel pump and all the other stuff I'll stick with 91 since that's the highest here and once I start getting extra cash I may look into swapping to e85


Silver 96 Z28 SideSwype-DD
Green 96 Z28 NightMare-Drag car

In a normally aspirated engine, octane requirement depends on many things, and one of those is elevation above sea level. El Paso shows as 3,800-ft above sea level in Wikipedia. That'a why they only sell 91 octane... you don't need anything higher because of the significantly reduced barometric pressure. At 3,800-ft your engine only pulls in 87% of the air mass that it would consume at sea level. That means an 11.0:1 static compression ratio behaves like its 9.6:1.

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Originally Posted by Injuneer

In a normally aspirated engine, octane requirement depends on many things, and one of those is elevation above sea level. El Paso shows as 3,800-ft above sea level in Wikipedia. That'a why they only sell 91 octane... you don't need anything higher because of the significantly reduced barometric pressure. At 3,800-ft your engine only pulls in 87% of the air mass that it would consume at sea level. That means an 11.0:1 static compression ratio behaves like its 9.6:1.

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jeez man ... u do know alot!

MEMBER @ LTXtech.com

Hmmm ok cool didn't know that guess it's better to stay 91 for now


Silver 96 Z28 SideSwype-DD
Green 96 Z28 NightMare-Drag car