Billiumss

iTrader: (11)

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?

lilbuddy1587

iTrader: (1)

Dont they have a driveby sensor as opposed to a throttle body cable?

Phil99vette

iTrader: (11)

Never seen it before.

JoeyGC5

iTrader: (24)

Are you refering to the tip in? Whent he computer transitions from closed loop mode to PE mode?

Slowhawk

iTrader: (12)

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.

oange ss

iTrader: (50)

Etc Tm ?

Kano

iTrader: (3)

well ...what is it?

Billiumss

iTrader: (11)

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

hyde

The bottle!!!!!!!!!!!!!

NEVRLIFT

My uncle's Z06 had the same thing on his dyno sheet.

Robert56

iTrader: (2)

Like this, c5 Z06:

Robert

MSGHUFF

iTrader: (7)

I always thought it was because of the way the drivetrain is on a vette? So whats this "top secret" fix????

WS-Sick

I think the "fix" is the bottle. Be careful though, I hear it's addictive.

Slowhawk

iTrader: (12)

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

CNB

iTrader: (4)

Air/fuel. I also see you made it much richer at peak torque.

Phil99vette

iTrader: (11)

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

Robert56

iTrader: (2)

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

Slowhawk

iTrader: (12)

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

98SS2836

iTrader: (6)

You change timing, And injectors. I believe that would be a must.

98SS2836

iTrader: (6)

Im just thinking does it have somthing to do with the DFCO?