Just came back from my first Dyno...need your opinions please
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Just came back from my first Dyno...need your opinions please
I just got back from my first Dyno run of my Z (in fact my first EVER Dyno)
The only mods I have are JWT Pop Charger and racing clutch/flywheel.
I've included some pics of my Dyno sheet, and as you can see
The car Dynoed at 243.41 whp and 231.41 torque (ignore the mismeasured 242.33 tq)
OK everything sounds about right...UNTIL we look at Air/Fuel graph...
Usually NA engines run at 13(indicated by straight line below),
and I've seen graphs of other Zs - modified and stock, run around that measurement.
But then mine, it's ALL OVER THE PLACE! Very lean...WAY higher than 13.
Any idea what could be wrong? I think that the Pop Charger is sucking in
way more air and my Fuel's not discharging enough...
The works at the Dyno place also think it's caused by Pop Charger...
Anyone with Pop Charger had similar problem???
I could be potentially making a bit more power
The only mods I have are JWT Pop Charger and racing clutch/flywheel.
I've included some pics of my Dyno sheet, and as you can see
The car Dynoed at 243.41 whp and 231.41 torque (ignore the mismeasured 242.33 tq)
OK everything sounds about right...UNTIL we look at Air/Fuel graph...
Usually NA engines run at 13(indicated by straight line below),
and I've seen graphs of other Zs - modified and stock, run around that measurement.
But then mine, it's ALL OVER THE PLACE! Very lean...WAY higher than 13.
Any idea what could be wrong? I think that the Pop Charger is sucking in
way more air and my Fuel's not discharging enough...
The works at the Dyno place also think it's caused by Pop Charger...
Anyone with Pop Charger had similar problem???
I could be potentially making a bit more power
Last edited by gsazabi; Sep 9, 2005 at 02:06 PM.
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From: 818 So.Cal
Originally Posted by davidv
The air:fuel ratio is interesting especially the bump between 3,500 and 4,500 rpm. It appears that the Z is running lean. What explanation did the technician give you?
He also told me to get my fuel tuned so that it'll give out more???
How would I go about fixing this problem...
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the AF sensor could have been faulty... Thats not an uncommon thing... So they arent always accurate...
If an O2 Sensor Bung was made and the AF readings were taken from there, that is a different story...
If an O2 Sensor Bung was made and the AF readings were taken from there, that is a different story...
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From: Philly
Keep in mind that the Z runs lean as it is from the manufacturer. Now when you add a pop charger or any intake, exhaust, headers or plenum you are getting ALOT of airflow, thus leading very lean AF reading . The way to correct this and getting true output and power gains from your air flow mods is to get your ECU flashed/tuned. Keep in mind the Z ECU is like a learning style cpu so any air flow type mod, it's going to wipe it out and you will not see true power gains from your mods. Technosquare offers ECU flashing to cater to your mods. You should look into it if it's such a concern to you. Also I AM NOT IN NO WAY AFFLIATED WITH TECHNOSQUARE.
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Originally Posted by Jason@Performance
the AF sensor could have been faulty... Thats not an uncommon thing... So they arent always accurate...
If an O2 Sensor Bung was made and the AF readings were taken from there, that is a different story...
If an O2 Sensor Bung was made and the AF readings were taken from there, that is a different story...
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From: 818 So.Cal
Originally Posted by Jason@Performance
with the gas stuff going on these days, you could have gotten bad gas and was detonating...
how did they take the AF measurements?
how did they take the AF measurements?
All I know is that they put some kind of stick inside my exhaust
And they connected something to my engine xP
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From: 818 So.Cal
Originally Posted by React3
The way to correct this and getting true output and power gains from your air flow mods is to get your ECU flashed/tuned.
Can it be done at dealership? Jason?
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Originally Posted by gsazabi
Umm..how are they supposed to measure it?
All I know is that they put some kind of stick inside my exhaust
And they connected something to my engine xP
All I know is that they put some kind of stick inside my exhaust
And they connected something to my engine xP
the connection for the air fuel sensor they put in the exhaust goes bad alot... and it looks like it got worse after a couple of runs, so the vibration could have made it worse...
its just like an audio cable... you keep moving them around enough, disconnecting and re-connecting... they are eventually going to go bad...
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Originally Posted by gsazabi
Yea I was thinking about ECU flashing...
Can it be done at dealership? Jason?
Can it be done at dealership? Jason?
I would wait till you have more mods first though
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