Whats everyone using for Base Fuel Pressure
04-19-2010, 10:52 PM
#4
Race Director
Idle 56psi, not sure of the vacuum though as my Spa gauge reads in 0-11 increments.
04-20-2010, 07:00 AM
#6
Tech Contributor
Be careful Drew. If you deviate from where it was tuned on base pressure and then go boost referenced, flattening out your IFR table, you are going to change the accuracy of your tune. It should be 58psi with the vacuum line off.
When you apply the vacuum line with the engine running, you'll see the pressure drop relative your idle vacuum.
When you apply the vacuum line with the engine running, you'll see the pressure drop relative your idle vacuum.
04-20-2010, 08:01 AM
#8
Safety Car
Be careful Drew. If you deviate from where it was tuned on base pressure and then go boost referenced, flattening out your IFR table, you are going to change the accuracy of your tune. It should be 58psi with the vacuum line off.
When you apply the vacuum line with the engine running, you'll see the pressure drop relative your idle vacuum.
When you apply the vacuum line with the engine running, you'll see the pressure drop relative your idle vacuum.
04-20-2010, 03:22 PM
#9
Le Mans Master
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04-20-2010, 04:32 PM
#10
Le Mans Master
Be careful Drew. If you deviate from where it was tuned on base pressure and then go boost referenced, flattening out your IFR table, you are going to change the accuracy of your tune. It should be 58psi with the vacuum line off.
When you apply the vacuum line with the engine running, you'll see the pressure drop relative your idle vacuum.
When you apply the vacuum line with the engine running, you'll see the pressure drop relative your idle vacuum.
58psi with vacumm line off..
04-20-2010, 05:29 PM
#12
All the cars with return systems that I do I set the base pressure to 50-53 with the vacuum line off.
I do this to get more flow out of the pumps.
For example a Walbro 255 at 50 psi flows 250 lph, at 60 psi it flows 238 psi, as psi goes up the flow rate goes down.
I do this to get more flow out of the pumps.
For example a Walbro 255 at 50 psi flows 250 lph, at 60 psi it flows 238 psi, as psi goes up the flow rate goes down.
