dyno results..should i fix this

Ruckus46Gt

Member

Nov 26, 2003

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Long Island

Sep 25, 2004

#1

• Sep 25, 2004

• #1

Ok i ran my car on the dyno before and the predator really leaned my car out. I added 5% more to top and bottom. Should i add a little bit more? Also are my numbers good or should they be a little more(i think tq's a little low but idk)

sorry about the quality dont have a scanner

 

Dan_Soprano

15 Year Member

May 7, 2003

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Jacksonville, FL

Sep 25, 2004

#2

• Sep 25, 2004

• #2

running a bit lean there brother!!!

 

twogts4us

15 Year Member

Apr 1, 2004

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Dunedin, FL

Sep 25, 2004

#3

• Sep 25, 2004

• #3

Where's the A/F ratio graph? The max A/F ratio doesn't mean a thing...

 

Redfire03GT

New Member

Sep 10, 2003

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Newark, CA.

Sep 25, 2004

#4

• Sep 25, 2004

• #4

That's not too bad

I had a solid 14.0 across the board and still managed to pull 260/303.

A flat 13 I think should be alright, I spose.

 

GT2000JAY

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Oct 22, 2002

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Sep 25, 2004

#5

• Sep 25, 2004

• #5

twogts4us - One of the lines refers to a/f and it is the right hand side of the graph.

Yeah, you are running lean. I would definitely straighten that out. At WOT, I wouldn't want to run leaner than 13:1 at any point.

Jay

 

twogts4us

15 Year Member

Apr 1, 2004

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Dunedin, FL

Sep 26, 2004

#6

• Sep 26, 2004

• #6

GT2000JAY said:

twogts4us - One of the lines refers to a/f and it is the right hand side of the graph.

Yeah, you are running lean. I would definitely straighten that out. At WOT, I wouldn't want to run leaner than 13:1 at any point.

Jay

Click to expand...

Oh, OK - duh...sorry, I didn't see it at first. I just scrolled sideways on the last graph (which doesn't have it), and saw the max numbers on the first to pictures.
I dunno about fixing it though - these mod motors need to run lean to make good power. If it isn't detonating and your plugs look good, I'd leave it. Hard to exactly read this picture though...but if it's 14:1 on an N/A motor 3K on up, getting richer as you go up, and it's not fouling plugs or detonating, I'd run it as is.

 

Ruckus46Gt

Member

Nov 26, 2003

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Long Island

Sep 26, 2004

#7

• Sep 26, 2004

• #7

really the power didnt change much when i riched in just the torque...from the first run to the last i said i picked up about 12ft/lbs or torque

 

GT2000JAY

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Oct 22, 2002

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Sep 26, 2004

#8

• Sep 26, 2004

• #8

twogts4us said:

I dunno about fixing it though - these mod motors need to run lean to make good power. If it isn't detonating and your plugs look good, I'd leave it. Hard to exactly read this picture though...but if it's 14:1 on an N/A motor 3K on up, getting richer as you go up, and it's not fouling plugs or detonating, I'd run it as is.

Click to expand...

I would never run a car this lean - he's way too lean at low RPM. If it was good for the car to run above 14.64:1 at WOT, the manufacturers would set them up to run that lean at part throttle - better emissions. It's just not safe, even though it's not detonating doesn't mean it's safe.

 

Y

YtnGT

Founding Member

Sep 23, 2002

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TX

Sep 26, 2004

#9

• Sep 26, 2004

• #9

What kind of A/F meter was the shop using and where was it located? If the O2 sensor was in the tailpipe and you have cats in the midpipe couldn't that skew the a/f ratio?

When I had the predator tune @ +5% WOT fuel it seemed like there was a bit more carbon than normal in the tailpipe.

I have been checking the plugs regurally and they look fine... I really need an LM-1 A/F meter - just another $350

 

Ruckus46Gt

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Nov 26, 2003

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Long Island

Sep 26, 2004

#10

• Sep 26, 2004

• #10

not sure what kind they used it was located in the tail pipe and i do not have cats

 

admdavs

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Feb 25, 2004

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Chicago

Sep 26, 2004

#11

• Sep 26, 2004

• #11

??

 

Ruckus46Gt

Member

Nov 26, 2003

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Long Island

Sep 26, 2004

#12

• Sep 26, 2004

• #12

ok i think i'm going to add 1% low end and .5 percent top end more fuel.....Also is my torque low? I thought my torque would have been higher. I think my car could have pulled a 250 if i had my fuel straight on the first pull. My first pull was 245. something and that was with hit that lean

 

6

65straightsick

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Jun 4, 2004

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Montgomery, AL

Sep 26, 2004

#13

• Sep 26, 2004

• #13

Don't rag on the newbie here but what is a predator?

 

Ruckus46Gt

Member

Nov 26, 2003

385

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Long Island

Sep 27, 2004

#14

• Sep 27, 2004

• #14

its a handheld flash tuner that does things to enhance performance by adjusting timing, fuel and other little things. Its basicly hit or miss also. So cars it will tune great others need to be tweaked