how much boost can you run with 112 octane

[Natedsmeclipse]

hey guys i have a friend thats running 112 race fuel in his car with and i was wondering how much boost can you run before detonating.

 

[yepes281]

It depends on what kinda turbo, what kinda tune, ect.

 

[Bigmac88]

There are way too many factors involved to give you a single solid number. What kind of turbo does he have? What else is done to the motor? What's the tuning situation? etc.

There's a power/psi cap on the turbo your friend is using.

The main thing to remember is detonation and pre-ignition can be avoided on any setup with a proper tune. A properly-tuned motor is a happy, healthy motor

Simply running 112 octane fuel and turning the boost up is not a good solution.

 

[Natedsmeclipse]

its a zeta 3.2 and he is running 24lbs on a fully built srt-4 motor. its dyno tuned but the guy that tuned it i would not trust with my lawn mower.

 

[LiquidX]

It'll depend on the tune he is running and whether he is logging or not, the turbo, internals, etc. etc.

You can have a T-25 and still only run 15psi because after that regardless of how high grade the fuel is, it's out of the efficency range for the T-25 and you'll be blowing hot air and destroying the turbo.

You could have a E316g and be good to run 25psi as the turbo loves it, but without a proper tune or the right injectors, you are not getting the right amount of fuel to the cylinders, which is bad.

Say you have a Holset HX40, the 112 octane (could) supports say 40psi from the HX40. Still in the efficiency range and you have the injectors to run it. So far so good, are the head studs capable of holding the power? Does he have a head gasket that will support it? How about main and rod studs that won't blow off from the torque?

What you'll need to know:
Just because some fuel can allow you to run more PSI doesn't mean it will run the same numbers on car A compared to car B. This is also why you need to log to see what the car is doing internally and whether or not your setup will allow said numbers. He'll have to do some runs with the race gas on a dyno preferable and figure out when he is knocking. Back the psi off, re check and if no knock then that is where he'll be safe on that tune. He could get it re tuned for the race gas and could get some more timing advance and lean out the octane table all around as well.

 

[99gst_racer]

A level of boost doesn't tell us enough information at all to make a good determination. More accurate information would be mass flow, air temperature, and air-to-fuel ratio.

 

[SlowDSM_GSX2g]

it highly depeng on the tunning, my friend is ruuning his 91 talon @35 psi with this gas

 

[burkgonzo]

it highly depeng on the tunning, my friend is ruuning his 91 talon @35 psi with this gas

 

[SlowDSM_GSX2g]

he has a fully build engine and is tunning w microtec

I hava a stock non turbo 6 bolt on my gsx and im running @25 psi w 93oct

trust me if you want

I hava a stock non turbo 6 bolt on my gsx and im running @25 psi w 93oct

trust me if you want

and forgot to mention i have a stock ecu