JapCarForum Car Manufacturers Lexus/Toyota IS200 / IS300 / SPORTCROSS / Altezza Supercharging & Turbo Modifications AFR Readings

AFR Readings

AFR Readings

Jon
Member
Find
189
08-04-2020, 11:49 PM
#1
What sort of readings are everyone getting on their Supercharged IS200s?

I finally got my AFR Gauge wired up, and went out for a drive.

Under normal driving, the gauge went up and down, as you'd expect, but on a 'full throttle test' :wink: the reading dropped to around 11 and stayed there.

Is this normal? I was expecting it the lean out a tad at higher revs

The gauge I went for has a datalogger built in, so i'll try and get the graph to show the reading through the full rev range when I get the tacho signal connected.
Reply
Reply
Jon
08-04-2020, 11:49 PM #1

What sort of readings are everyone getting on their Supercharged IS200s?

I finally got my AFR Gauge wired up, and went out for a drive.

Under normal driving, the gauge went up and down, as you'd expect, but on a 'full throttle test' :wink: the reading dropped to around 11 and stayed there.

Is this normal? I was expecting it the lean out a tad at higher revs

The gauge I went for has a datalogger built in, so i'll try and get the graph to show the reading through the full rev range when I get the tacho signal connected.

Reply
Reply
toxo
Posting Freak
Website Find
4,843
09-04-2020, 12:03 AM
#2
Sounds like a normal Toyota fuel map to me. Loads of fuel at the top end for safety. Leaning it out would release more power.
Reply
Reply
toxo
09-04-2020, 12:03 AM #2

Sounds like a normal Toyota fuel map to me. Loads of fuel at the top end for safety. Leaning it out would release more power.

Reply
Reply
is300_dino
Posting Freak
Find
3,556
09-04-2020, 12:19 AM
#3
14.7 is good stoichness, 11 will be rich as your on full throttle adding fuel, anything above 14,7 is lean too much air.
jae 2010 best lexus category show and shine winner
jae 2010 ice outlaw award 2nd place
jae 2011 ice outlaw award 1st place
Reply
Reply
is300_dino
09-04-2020, 12:19 AM #3

14.7 is good stoichness, 11 will be rich as your on full throttle adding fuel, anything above 14,7 is lean too much air.

jae 2010 best lexus category show and shine winner
jae 2010 ice outlaw award 2nd place
jae 2011 ice outlaw award 1st place

Reply
Reply
Jon
Member
Find
189
09-04-2020, 12:39 AM
#4
I thought 11 would be too rich?? I was expecting it to maybe go to 11 at low rpm, but rise to about 12 nearer the rev limiter?

one thing is for sure, I'm happy to put a bigger pulley on now,
Reply
Reply
Jon
09-04-2020, 12:39 AM #4

I thought 11 would be too rich?? I was expecting it to maybe go to 11 at low rpm, but rise to about 12 nearer the rev limiter?

one thing is for sure, I'm happy to put a bigger pulley on now,

Reply
Reply
toxo
Posting Freak
Website Find
4,843
09-04-2020, 12:50 AM
#5
This is the AFR (dashed line) for my old MR2 on stock management. One line is a stock MR2 ECU and the other is a stock GT4 ECU. Toyota make their engines go rich at the top end for safety, the fuel cools the block and makes very sure you avoid a lean-out.

[Image: BHPAFR.jpg]
Edited 21-05-2013, 10:25 AM by toxo.
Reply
Reply
toxo
09-04-2020, 12:50 AM #5

This is the AFR (dashed line) for my old MR2 on stock management. One line is a stock MR2 ECU and the other is a stock GT4 ECU. Toyota make their engines go rich at the top end for safety, the fuel cools the block and makes very sure you avoid a lean-out.

[Image: BHPAFR.jpg]

Reply
Reply
reganlives
Posting Freak
Find
1,230
31-05-2020, 04:27 AM
#6
Jon are you running an FCD or blackbox or emanage?
Reply
Reply
reganlives
31-05-2020, 04:27 AM #6

Jon are you running an FCD or blackbox or emanage?

Reply
Reply
mark3
Member
Website Find
187
31-05-2020, 04:50 AM
#7
11.2 to 11.5 (dependant on car) is usually good for power, the leaner you go on full throttle the more torque you loose, my Supra was dyno'd at 359.8hp but only 330lbft of torque, basically 70ftlb down on what you would expect from a 7MGTE at that level of tune due to air/fuel ratios in the high 13s! Confusedad:

Its now been sorted with larger injectors and an HKS fuel controller and i reckon is now between 420 to 450lbft with hp tipping the 400 mark, in first gear on a warm road it almost feels like its gonna lift the front wheels off the ground :ohmy:
Reply
Reply
mark3
31-05-2020, 04:50 AM #7

11.2 to 11.5 (dependant on car) is usually good for power, the leaner you go on full throttle the more torque you loose, my Supra was dyno'd at 359.8hp but only 330lbft of torque, basically 70ftlb down on what you would expect from a 7MGTE at that level of tune due to air/fuel ratios in the high 13s! Confusedad:

Its now been sorted with larger injectors and an HKS fuel controller and i reckon is now between 420 to 450lbft with hp tipping the 400 mark, in first gear on a warm road it almost feels like its gonna lift the front wheels off the ground :ohmy:

Reply
Reply
Recently Browsing
 1 Guest(s)
Recently Browsing
 1 Guest(s)
Related Threads…
DYNO readings
by lexusdaydreaming
Replies 0
Views 220
24-06-2022, 01:14 PM
Last Post by lexusdaydreaming