boost question

[microsuck]

My buddy with the turbo 5.0 was talking about how there is a limit to how much boost you can run on 93 octane gas. Anyone know what it is?
Andrew
ps a boost per octane chart or formula would be really helpful, I just bought a turbo CBR 929 rr with a built motor.

[cpeapea]

i think its slightly more dynamic than just a chart. you could run 20 lbs of boost on pump or maybe even 30, but youd have to retard the timing and richen it up quite a bit. thats where higher octane comes in, you can regain your 'lost' power by retuning it for higher octane. but i could be wrong?

[L8 APEX]

There are too many variables to consider. original compression, cam LSA, instercooler capacity, compressor efficiency, then of course timing and a/f.

[microsuck]

so what about my truck? 6# on it22's with stock cam and intercooler? normal tuning on the chip.

[L8 APEX]

It is getting close I don't run over 4# on daily drivers or vehicles that need to be reliable. It is all in the tune as to help the motor stay together. The intercooler water will heat up a lot faster and take longer to cool down. So it is okay for controlled drag racing but highway racing will tear it up faster.

[wesman]

Way too many variables...I've seen 300zx's running 20+ on pump gas.

--wes

[microsuck]

so am I supposed to tell how much boost is safe to put on this turbo bike i bought? Is there a way to tell?

[wesman]

Honestly best way is to get it dyno tuned. I would also get on cycle forums and ask around....gauranteed it's been done before.

--wes

[L8 APEX]

I think 6-8lbs is all you can drive it with. As it sits you'll need a crazy extended swingarm and 200 tire to get any traction.

[wesman]

Originally posted by L8 APEX
I think 6-8lbs is all you can drive it with. As it sits you'll need a crazy extended swingarm and 200 tire to get any traction.

lol..that's for sure...that thing is gonna be a monster. I think I may have seen it for sale before.....DamonH gave me a link to it.

--wes

[microsuck]

you guys were right about the 6-8 psi on pump gas. I had asked the guy about it last night. right now it is running at 10 psi and you put 8 drops of octane booster into the tank. the dude plugs his laptop into it while its on the dyno and makes custom maps for the power commander. I better get him to teach all this crap to me before he dissappears.
Andrew