Quote:
Originally Posted by fastsupra
I just purchased the Sound Performance fuel system with the 255 dual walbro pumps and 880cc injectors and I was just wondering about how much power my setup will be able to handle. Also, will a Greddy 3 row intercooler be able to handle 700whp or will i need to upgrade it?. Last and final question, how do you calculate how much boost you can run on pump gas safely?
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These injectors will be good for at least 850rwhp (6spd), with proper tuning. Your GReddy 3-row will handle 700rwhp (6spd) just fine.
Although you can't easily calculate precisely how much boost you can run with a given octane of gasoline, you can get 'in the ballpark' ... after that, it's best to use data logging of your knock sensors to determine the real number. Also recall that octane degrades over time, so you can run more boost with fresh fuel than you can with fuel that's six months old. The real calculations use difficult-to-collect data points like cylinder pressure and the temperature of the metal in the spark plug.
Please take a look at
this post (above) for a set of approximate boost-to-octane ratios:
http://www.toyota-supra.info/forums/102902-post29.html
In that chart, you see that pump gas is only 88MON, which is only good for about 15psi. Of course, you'll get more power at 15psi with a 700rwhp turbo than you will with the stock twins. However, above 15psi you need to use the data from your knock sensors to ensure you're not damaging your engine. The only other alternative is to keep raising boost until you blow up an engine (or significantly reduce it's compression/leakdown numbers), and then next time (and $4000 later, including parts and labor) don't run that much boost.
