Dynoed my car, low numbers.

[Denji]

I just dynoed my car (Luigi) yesterday, sadly Luigi didnt do as well as i thought. When he is hardcore i refer to him as "The Wege", maybe i should get my screename changed to that.

Please help me look, this is without any engine fuel management at all, 142k on the motor, relevant power mods are as below.

Johnny Racecar Big Core FMIC
Greddy B.O.V.
Hard intake pipe
K & N air filter
NGK Ignition wires
MBC
South bend Clutch DXD rally clutch
Bosal 3' SS catback exhaust
t-28 killer turbocharger
ported evo 3 exhaust manifold
walbro 190lph fuel pump
3" high flow catalytic converter
3" downpipe (no neckdowns in exhaust system)

I want to have 250 awhp, i fell a little short. Help me out, i dont even know how to really read the air ratio part of the graph.

1st run is on 16 pounds of boost, second is on 18 pounds of boost

 

[GVR4592]

The dyno starts at 2k rpm.

That was my point. Where do you see it idling and at 15:1?

 

[ilikespeeding]

That was my point. Where do you see it idling and at 15:1?

Well, you got me. I dont directly see it. But Id be willing to bet that in 1k rpm he's not gonna go from a 11:1 to a 13:1 based on the line trend. The only real way to tell is to get a wideband 02 sensor and A:F guage.

 

[GVR4592]

So it's never really to lean then. You just assume it is. Now from what you said, he thinks you know what you are talking about and he thinks it lean, which it's not. A/F curves aren't linear, so there's no way to know what his A/F is at idle.

 

[ilikespeeding]

So it's never really to lean then. You just assume it is. Now from what you said, he thinks you know what you are talking about and he thinks it lean, which it's not. A/F curves aren't linear, so there's no way to know what his A/F is at idle.

I guess it depends on what you'd define lean as. To me, stock A:F is lean. So, I do see him running around 13:1, which by my defination is lean. It is true that A:F curves arent linear, but at the same time they arent 100% random. Its not like the bounce like a geiger counter or a polygraph.

 

[GVR4592]

13:1 at 2000 rpms is not lean, 500 rpms later it's 12:1, another 500 rpms after that it's 10.5:1. So by the time the turbo reaches full boost, A/F is 10.5:1. It's supposed to be progressive like that, if it was 11:1 at 2000 rpms the car would fall on it's face.

 

[ilikespeeding]

13:1 at 2000 rpms is not lean, 500 rpms later it's 12:1, another 500 rpms after that it's 10.5:1. So by the time the turbo reaches full boost, A/F is 10.5:1. It's supposed to be progressive like that, if it was 11:1 at 2000 rpms the car would fall on it's face.

But you can adjust injector load based on RPM. So why not set the injectors on a near about perfect load all the way thru for maximum power?

 

[GVR4592]

What A/F ratio do you think would make maximum power at 2000 rpms on this setup?