What is VE? (tuning for hot starts)
06-28-2003, 01:43 PM
#1
TECH Fanatic
Thread Starter
iTrader: (1)
Join Date: Sep 2002
Posts: 1,684
Likes: 0
Received 0 Likes
on
0 Posts
What is VE? (tuning for hot starts) I having Idle problems during hot starts, On aprevious post everyone was talking about scaleing the VE tables, Is that the main volumeteric effitciency tabe? or the cranking VE table? or is I't somthing totaly different? 
Please help me with this. thanx in advance. 
Please help me with this. thanx in advance. 
06-28-2003, 10:30 PM
#5
Moderator
iTrader: (11)
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,604
Likes: 0
Received 6 Likes
on
6 Posts
Re: What is VE? (tuning for hot starts) VE is volumetric efficiency.
Speed density fuel calculation figures airflow by
speed (RPM) times manifold air density (MAP) times
volumetric efficiency fudge factor (VE). VE is the
rolled-up model of your entire engine - intake tract,
cam profile, exhaust - relative to the engine
displacement ideal pumping volume.
At start, the MAF is bogus (no airflow) and speed
density is all you have to go on. If your VE scale
factor is off at low RPM (like especially from a
big cam, where overlap messes with your cylinder
filling) you will be relying on a hosed speed
density mixture calc.
Speed density fuel calculation figures airflow by
speed (RPM) times manifold air density (MAP) times
volumetric efficiency fudge factor (VE). VE is the
rolled-up model of your entire engine - intake tract,
cam profile, exhaust - relative to the engine
displacement ideal pumping volume.
At start, the MAF is bogus (no airflow) and speed
density is all you have to go on. If your VE scale
factor is off at low RPM (like especially from a
big cam, where overlap messes with your cylinder
filling) you will be relying on a hosed speed
density mixture calc.
06-29-2003, 06:45 PM
#6
Re: What is VE? (tuning for hot starts) VE is volumetric efficiency.
Speed density fuel calculation figures airflow by
speed (RPM) times manifold air density (MAP) times
volumetric efficiency fudge factor (VE). VE is the
rolled-up model of your entire engine - intake tract,
cam profile, exhaust - relative to the engine
displacement ideal pumping volume.
At start, the MAF is bogus (no airflow) and speed
density is all you have to go on. If your VE scale
factor is off at low RPM (like especially from a
big cam, where overlap messes with your cylinder
filling) you will be relying on a hosed speed
density mixture calc.
joel(bink)
Trending Topics
07-02-2003, 02:25 AM
#8
Restricted User
iTrader: (9)
Join Date: Sep 2002
Location: Sierra Vista, AZ
Posts: 7,603
Likes: 0
Received 0 Likes
on
0 Posts
Re: What is VE? (tuning for hot starts) Is this what you adjust when you put a cam in to get the IAC counts right, so it will not surge? or is there something else??
