when is it time to start worring about what fuel needs to be used

1TITAN · August 5th, 2009, 10:13 AM

this is just me being curious but i want to knnow when do you as a engine builder... wether it be professional or do it yourselfer, when and how you go about determining that this engine that youve built needs to run on something more then standard 93 octane pump gas?

im not to that point yet lol but i like to know this kinda stuff

thanks for your time

bitemark46 · August 5th, 2009, 05:28 PM

Compression ratio, timing, and IAT's.

-Mark

1TITAN · August 5th, 2009, 06:20 PM

iat's... translate that for me lol

bitemark46 · August 10th, 2009, 09:33 AM

Intake air temperature. Usually with forced induction you have hotter intake temps due to the blower or turbo (not nitrous though) that heats up the air entering the motor. So that translates to a hotter temp in the cylinder which could lead to pre-ignition. Higher octane gas can resist the increase in heat.

1TITAN · August 11th, 2009, 03:11 PM

oh i gotcha, im in the process of doin research for building a more serious motor for the car and i didnt know if messin with boreing, or porting and polishing, or even cams would call for a need for any of that. i dont plan on messin with either of the 3 variables that ya mentioned but it is very useful information to know. thanks

Trick Tuners · August 11th, 2009, 03:55 PM

compression and boost are the 2 big ones. Timing can be adjusted. Hot IATs will demand more octane. You can read this on things that can cause detonation and remember the cure for detonation can be higher octane.
Detonation Explained

August 5th, 2009, 10:13 AM	#1
1TITAN Regular 01 mustang gt 13.98@100 Join Date: Oct 2007 Location: Orlando, Florida Posts: 265 iTrader: 0 reviews	when is it time to start worring about what fuel needs to be used this is just me being curious but i want to knnow when do you as a engine builder... wether it be professional or do it yourselfer, when and how you go about determining that this engine that youve built needs to run on something more then standard 93 octane pump gas? im not to that point yet lol but i like to know this kinda stuff thanks for your time __________________ destroy in the turns, then obliterate on the straightaway 01 GT 4.6/20 over cold air intake/70 mm throttle body mac longtube headers/custome H pipe/moroso spiral mufflers to side exhaust computer tune race seats / 5 point harness

August 5th, 2009, 05:28 PM	#2
bitemark46 Regular Join Date: May 2008 Location: Tampa, Fl Posts: 397 iTrader: 0 reviews	Compression ratio, timing, and IAT's. -Mark __________________ -Mark- 98' N/A Cobra (Stock longblock) 11.79 at 114.64 (1.62 60ft)

August 5th, 2009, 06:20 PM	#3
1TITAN Regular 01 mustang gt 13.98@100 Join Date: Oct 2007 Location: Orlando, Florida Posts: 265 iTrader: 0 reviews	iat's... translate that for me lol __________________ destroy in the turns, then obliterate on the straightaway 01 GT 4.6/20 over cold air intake/70 mm throttle body mac longtube headers/custome H pipe/moroso spiral mufflers to side exhaust computer tune race seats / 5 point harness

August 10th, 2009, 09:33 AM	#4
bitemark46 Regular Join Date: May 2008 Location: Tampa, Fl Posts: 397 iTrader: 0 reviews	Intake air temperature. Usually with forced induction you have hotter intake temps due to the blower or turbo (not nitrous though) that heats up the air entering the motor. So that translates to a hotter temp in the cylinder which could lead to pre-ignition. Higher octane gas can resist the increase in heat. __________________ -Mark- 98' N/A Cobra (Stock longblock) 11.79 at 114.64 (1.62 60ft)

August 11th, 2009, 03:11 PM	#5
1TITAN Regular 01 mustang gt 13.98@100 Join Date: Oct 2007 Location: Orlando, Florida Posts: 265 iTrader: 0 reviews	oh i gotcha, im in the process of doin research for building a more serious motor for the car and i didnt know if messin with boreing, or porting and polishing, or even cams would call for a need for any of that. i dont plan on messin with either of the 3 variables that ya mentioned but it is very useful information to know. thanks __________________ destroy in the turns, then obliterate on the straightaway 01 GT 4.6/20 over cold air intake/70 mm throttle body mac longtube headers/custome H pipe/moroso spiral mufflers to side exhaust computer tune race seats / 5 point harness

August 11th, 2009, 03:55 PM	#6
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	compression and boost are the 2 big ones. Timing can be adjusted. Hot IATs will demand more octane. You can read this on things that can cause detonation and remember the cure for detonation can be higher octane. Detonation Explained __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

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