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Most C5 Dyno Graphs have...

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Old Sep 16, 2006 | 06:05 AM
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Question Most C5 Dyno Graphs have...
I have noticed that a lot of C5 dyno graphs have a weird curve to it in the beginning of the dyno run. It starts out kinda flat then really takes off. I have seen this on cars I've tuned, you can even hear a sound difference too.

Why is that?
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Old Sep 16, 2006 | 03:20 PM
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Dont they have a driveby sensor as opposed to a throttle body cable?
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Old Sep 16, 2006 | 03:33 PM
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Never seen it before.
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Old Sep 16, 2006 | 08:11 PM
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Are you refering to the tip in? Whent he computer transitions from closed loop mode to PE mode?
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Old Sep 16, 2006 | 09:07 PM
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I know what your talking about it flattens a bit at the beggining if you start at a low rpm.There is a fix to that.
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Old Sep 16, 2006 | 09:18 PM
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Etc Tm ?
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Old Sep 16, 2006 | 09:33 PM
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Originally Posted by Slowhawk
I know what your talking about it flattens a bit at the beggining if you start at a low rpm.There is a fix to that.
well ...what is it?
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Old Sep 17, 2006 | 06:16 AM
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Originally Posted by Slowhawk
I know what your talking about it flattens a bit at the beggining if you start at a low rpm.There is a fix to that.
Yep that's it, seen it a lot, even in most C5 Dyno posts on this board.

What's the "fix" if you don't mind sharing.

Bill
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Old Sep 17, 2006 | 06:24 AM
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The bottle!!!!!!!!!!!!!
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Old Sep 17, 2006 | 10:26 PM
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My uncle's Z06 had the same thing on his dyno sheet.
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Old Sep 18, 2006 | 12:00 AM
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Like this, c5 Z06:

Robert
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Old Sep 18, 2006 | 07:49 PM
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I always thought it was because of the way the drivetrain is on a vette? So whats this "top secret" fix????
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Old Sep 19, 2006 | 01:24 PM
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I think the "fix" is the bottle. Be careful though, I hear it's addictive.
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Old Sep 19, 2006 | 04:25 PM
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Here's a hint This is a blown Vette with no dip at the beggining.What do you change with a Vette when you put a blower on

Sorry,took me a year to figure it out.So I'll make it a quick learning experience for you guy's but you have to guess
Attached Thumbnails Most C5 Dyno Graphs have...-brent-427-blower.jpg  
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Old Sep 19, 2006 | 05:50 PM
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Air/fuel. I also see you made it much richer at peak torque.
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Old Sep 19, 2006 | 06:21 PM
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It has to be P/E Delay, my car never does anything close to that. You can hammer the pedal @ 1k and it will go right to the target A/F.
Phil
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Old Sep 19, 2006 | 08:08 PM
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Originally Posted by Phil99vette
It has to be P/E Delay, my car never does anything close to that. You can hammer the pedal @ 1k and it will go right to the target A/F.
Phil
I set my PE rpm on lower, and have no issues even off the bottle, also. This is also a good dry tuning trick.
Robert
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Old Sep 19, 2006 | 08:11 PM
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Originally Posted by CNB
Air/fuel. I also see you made it much richer at peak torque.
No,thats just tuning being screwy on the A/F.The blue graph is a NA run,red is blower.

It's not an A/F problem.The Vette's do something different
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Old Sep 19, 2006 | 08:24 PM
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Originally Posted by Slowhawk
Here's a hint This is a blown Vette with no dip at the beggining.What do you change with a Vette when you put a blower on

Sorry,took me a year to figure it out.So I'll make it a quick learning experience for you guy's but you have to guess
You change timing, And injectors. I believe that would be a must.
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Old Sep 19, 2006 | 08:31 PM
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Im just thinking does it have somthing to do with the DFCO?
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