i was told if i wanted to run 20+ psi...then i should only use racing fuel. is this correct??? right now i'm running about 12psi w/shell v-power. thanks for the input.

 

Need alot more info than that bro

 

Honestly, race fuel will run better at even low boost levels, you just want to make sure you tune it properly. However, a good tuner can make 300+ horsepower on 93 octane. What setup are you currently running? What motor?

 

it's a 95 civic coupe that has a fully built D16Z6 single cam vtec motor turbocharged. sc 60 t3/t4 precision turbo with skunk 2 intake manifold, precision intercooler. full msd ignition and holley fuel pump, aem fuel rail. three inch full exhaust from the downpipe back. ross pistons 8.5 compression .20 overbore. scat rods, crank has been polished. aluminum racing radiator. unorthodox underdrive pulleys. 550cc rc injectors, stainless steel 1mm oversize valves. dual stage turbo xs boost controller. fully race ported head, zex stage 2 cam with aem adjustable cam gear. it's also been tuned with hondata.

 

at least you got the right pulley kit by how they only lighten weight and not size so it doesnt drag your alternator power output down

 

Yea thats true. When you run over 18 lbs of boost usually thats when you need to start using some race fuel. You should run some 112 octane or whatever you can get your hands on. To run over 20 lbs you need bigger injectors. You need some 750cc or bigger. I max out my 550cc at 15 lbs of boost.

 

Nice Setup, but it makes me wonder. If you know this much about your setup you should know that you should use the fuel you were tuned with. You can be tuned for pump or race gas. You might be able to get away with using 93 octane.......consult your tuner first though, as he will know much more about your car than us.

 

yeah, every setup is different... the only difference in "race fuel" is its resistance to detonation, basically its a more controlled spark. with 20 psi of boost and only a small intercooler I'd say race fuel is almost a must. But if you have a decent sized intercooler and you are running enough fuel then you should be able to get away with pump gas at 20 psi. The main thing right now is making sure you are getting enough fuel, if you are running a bit on the rich side you could possibly get away with 93 octane. Look into water injection (check out www.snowperformance.net if you are interested), you have a nice setup and WI will definately help prevent knock and probably get you quite a bit more power by being able to further cool the IAT's and run more aggressive timing.

Do you know your current a/f ratio?

 

thanks for all the input guys. i really appreciate the info.