Front vs Rear rotor EGT..
#1
Front vs Rear rotor EGT..
For high boost applications (25psi), on average, how much % fuel do you guys find you're adding to the rear rotor to equalize your egts. I am adding as much as 6-7% to my rear staged injector on my haltech to have my EGT's come within 50* of each other, with the rear still being the higher. Does this see normal? Do you guys find yourself adding this much fuel?
Thanks for your replys
Thanks for your replys
#4
i used to find on my old s5 intake setup used to have about 50degc different at idle but as load came on and especially into boost would be nearly identical.within 5degc of each other normally.sensors were identical placement of each other approx 20mm from manifold flange.(i realise you have a fd so results may vary)
#5
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,796
Received 2,574 Likes
on
1,830 Posts
i don't really know, but i do have two thoughts.
the first is that if you add 6% to the rear, you need to make sure it doesn't run out of duty cycle. for instance if you're running 85% injector duty, and then add 6% to the rear, the rear might be at 91%, which is kind of high. i'm not sure how the ecu will display that...
second, the EGT's on each rotor depend on a few different things (intake we know about, but exhaust manifold might matter, coolant temp front vs rear etc), and i wouldn't expect them to be the same, so if the correction is under say 10%, i'd think its fine.
the third thought is if you had flow numbers for the injectors to put the one that flowed the most in the rear, but that's a bit obvious
the first is that if you add 6% to the rear, you need to make sure it doesn't run out of duty cycle. for instance if you're running 85% injector duty, and then add 6% to the rear, the rear might be at 91%, which is kind of high. i'm not sure how the ecu will display that...
second, the EGT's on each rotor depend on a few different things (intake we know about, but exhaust manifold might matter, coolant temp front vs rear etc), and i wouldn't expect them to be the same, so if the correction is under say 10%, i'd think its fine.
the third thought is if you had flow numbers for the injectors to put the one that flowed the most in the rear, but that's a bit obvious
Trending Topics
#8
Full Member
My personal experience with front and rear EGT probes is that they are very sensitive to location.
Before you look too much into adding fuel to try to get the numbers the same, without knowing anything at all about your setup, it may be more likely that a temperature discrepancy will be as a result of probe placement.
Both the proximity of the probe to the exhaust port and the depth of the probe in the exhaust flow are critical to getting comparable temps.
Arran
Before you look too much into adding fuel to try to get the numbers the same, without knowing anything at all about your setup, it may be more likely that a temperature discrepancy will be as a result of probe placement.
Both the proximity of the probe to the exhaust port and the depth of the probe in the exhaust flow are critical to getting comparable temps.
Arran
Thread
Thread Starter
Forum
Replies
Last Post