MAP 99-100 @ WOT
MAP 99-100 @ WOT Im am tuning my injectors 30lbs to get my Ltrims around 0 and 0 at WOT, which they werent after install and using the excel spread sheat to change settings, In the injector flow rate it only goes up to 80. Question, is this good or bad? do i have too much MAP? do i need to change anything? THanks in advance
Re: MAP 99-100 @ WOT Anything in excess of 80 kpa MAP is going to be engine braking (ie High RPM, throttle closed). The injectors are practically held closed at this point to assist in the engine braking.
Sooo, MAP vacuums in excess of 80 kpa are not pertinant to fueling. It is fine that your table ends at 80.
Sooo, MAP vacuums in excess of 80 kpa are not pertinant to fueling. It is fine that your table ends at 80.
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Joined: Nov 2001
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Re: MAP 99-100 @ WOT You 99-100 at WOT, that good it show you don't have a restriction at all, on your intakes of Air into your engine, the closes you can get it to atmospheric pressure, which is considered to be 101.3kPa this amount is often rounded off to 100kPa, and convert this to inches of mercury =30.00Hg for imperial.
This is considered the best preformance you can get from the engine, lesser mean you havn't tune the engine correctly so always aim for a high MAP pressure when at WOT this is the best tune you can get.
This is considered the best preformance you can get from the engine, lesser mean you havn't tune the engine correctly so always aim for a high MAP pressure when at WOT this is the best tune you can get.
Re: MAP 99-100 @ WOT There is some confusion on absolute and gauge pressure.
You are talking about an absolute pressure reading. When your car is indicating 99-100 MAP your intake is operating at near atmospheric conditions. When your car is indicating 5 MAP your intake is operating at near perfect vacuum. So, according to your scantool 0 MAP is a perfect vacuum, and 100 MAP is atmospheric conditions, or no vacuum. To see what I am talking about, turn your ignition to the on position (don't turn the car on) and look at your MAP reading. It should say 100 MAP. That is because your car is not running and is not creating a vacuum in the intake.
Your injector flow tables are the inverse of your reading, or a gauge pressure. 0 on the table indicates 0 vacuum. 80 on the table indicates 80 kpa of vacuum.
It is confusing.
You are talking about an absolute pressure reading. When your car is indicating 99-100 MAP your intake is operating at near atmospheric conditions. When your car is indicating 5 MAP your intake is operating at near perfect vacuum. So, according to your scantool 0 MAP is a perfect vacuum, and 100 MAP is atmospheric conditions, or no vacuum. To see what I am talking about, turn your ignition to the on position (don't turn the car on) and look at your MAP reading. It should say 100 MAP. That is because your car is not running and is not creating a vacuum in the intake.
Your injector flow tables are the inverse of your reading, or a gauge pressure. 0 on the table indicates 0 vacuum. 80 on the table indicates 80 kpa of vacuum.
It is confusing.
