Car ran lean on dyno

3

350HPZ

New Member

Jul 18, 2003

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Mar 10, 2004

#1

• Mar 10, 2004

• #1

I went to street stuff in addison ill. and dynoed a03 Gt 5speed with TFS intake, Ford 70mm TB ,U/Dpullies ,steeda N/A tune,Flowmaster mufflers. the car dynoed at 241hp and 282 tq.the a/f is 15.9 at 3200,and stays at 15.5 till4300 rpm . At 5100rpm its at13.7.the second run is the same. My question is anybody have anything like this happen.

 

wms004

Founding Member

Jan 15, 2002

2,864

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49

Los Angeles

Mar 10, 2004

#2

• Mar 10, 2004

• #2

350HPZ said:

I went to street stuff in addison ill. and dynoed a03 Gt 5speed with TFS intake, Ford 70mm TB ,U/Dpullies ,steeda N/A tune,Flowmaster mufflers. the car dynoed at 241hp and 282 tq.the a/f is 15.9 at 3200,and stays at 15.5 till4300 rpm . At 5100rpm its at13.7.the second run is the same. My question is anybody have anything like this happen.

Click to expand...

I'd call up steeda.. Their tune should have adapted for those simple mods. They will probably help you out or have you send their tune back.

-wade

 

Sleepy1

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Jun 10, 2002

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Chicago, IL

Mar 10, 2004

#3

• Mar 10, 2004

• #3

mine was the exact opposite. It was running like 10.5:1 at 4k rpm. You probably need a custom dyno tune.

 

3

350HPZ

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Jul 18, 2003

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Mar 10, 2004

#4

• Mar 10, 2004

• #4

I checked for leaks vacumm is at 20in. Im faxing the dyno sheets to steeda so they can help out.Am I the only one that thinks 241 is low for what I have?

 

3

350HPZ

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Jul 18, 2003

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Mar 10, 2004

#5

• Mar 10, 2004

• #5

Come on guys anybody go lean from mods

 

wms004

Founding Member

Jan 15, 2002

2,864

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Mar 10, 2004

#6

• Mar 10, 2004

• #6

350HPZ said:

I checked for leaks vacumm is at 20in. Im faxing the dyno sheets to steeda so they can help out.Am I the only one that thinks 241 is low for what I have?

Click to expand...

Look at my mods and dyno. My dyno was in high 80's farenheight, and before Plenum and Throttle body which probably gave me around 8rwhp.

If you do the 15% loss, you are making almost 285hp at the flywheel and around 330 torque. Thats a 25hp gain over stock and about 28torque gain over claimed stock numbers.
Your intake and throttle body probably gave you like 6-8rwhp. Underdrives give between 2-8rwhp. I got 4rwhp from my dyno tune so i'd expect similar from yours. Mufflers probably gave you 2-3rwhp. Optimistically you could expect 23rwhp over stock and you are at 25.. so it all makes sense. your numbers are fine.

 

E

el_kid_1

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Oct 30, 2003

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Mar 10, 2004

#7

• Mar 10, 2004

• #7

Hp numbers are fine, but the A/F is dangerously lean. What meter did they use to measure the A/F?

 

3

350HPZ

New Member

Jul 18, 2003

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Mar 10, 2004

#8

• Mar 10, 2004

• #8

wide band 02.Thats all I know.

 

3

350HPZ

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Jul 18, 2003

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Mar 13, 2004

#9

• Mar 13, 2004

• #9

Anybody know what the numbers are uncorrected?

 

R

Roush21

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Dec 31, 2003

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Mar 13, 2004

#10

• Mar 13, 2004

• #10

If your car was on a dyno then why didnt you just have the tuner tune your chip so it wasnt lean