WOT Off Idle Acceleration

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Apr 26, 2009 | 05:33 PM

Exdeath

Thread Starter

Intermediate

Joined: Sep 2008

Posts: 47

Likes: 2

WOT Off Idle Acceleration

I have a 1979 Corvette making about 425 hp, automatic TH400 transmission, and a spreadbore Holley 650 Double pumper with mechanical secondaries. All possible components are currently designed for idle - 5500 RPM power.

My question is, can my car take off from a dead stop at idle (approx 950-1000 RPM) at WOT and not experience any lag or hesitation whatsoever?

I have tuned the car to the point of just having a split second of lag before it tears off. (Almost unnoticeable to passengers but I feel it) If I power brake to 1500-2000 RPM it just peels out with absolutely no lag.

I am somewhat of a perfectionist but I want to make sure that I am not trying to achieve something that is just impossible by trying to get rid of that split second of lag.

Thanks in advance

Apr 26, 2009 | 05:47 PM

bozzman3

Racer

Joined: Jan 2005

Posts: 499

Likes: 0

From: Enfield CT

Richen up the base idle,turning all 4 idle screws a small but equal amount,counter clockwise

Apr 26, 2009 | 06:07 PM

MotorHead

Race Director

Joined: Apr 2000

Posts: 17,676

Likes: 201

From: Who says "Nothing is impossible" ? I've been doing nothing for years.

Go up one or two sizes on your primary squirter might solve the problem

Apr 26, 2009 | 07:23 PM

OldCorvetteKid

Instructor

Joined: Feb 2006

Posts: 240

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From: Allentown PA

I had the same problem, but with a vacuum secondary carb. Increased the "squirter" nozzle one size, presto, no more bog at any RPM.

Apr 26, 2009 | 08:20 PM

tabbruzz

Safety Car

Joined: Feb 1999

Posts: 4,043

Likes: 342

From: Central NJ

Try to adjust the accerator pump to see if you can get rid of it...

Apr 26, 2009 | 08:24 PM

76 sting

Pro

Joined: Jun 2004

Posts: 700

Likes: 0

From: Lantana TX

Quote:

Originally Posted by OldCorvetteKid

I had the same problem, but with a vacuum secondary carb. Increased the "squirter" nozzle one size, presto, no more bog at any RPM.

this is the easiest and quickest way to get the bog out as long as all other tolerences are to spec.

Apr 27, 2009 | 06:58 PM

Reggie Dunlop

Drifting

Joined: Aug 2008

Posts: 1,381

Likes: 11

You can bet yer cheeks it aint the power valve!

Apr 27, 2009 | 07:18 PM

hugie82

Safety Car

Joined: Mar 2007

Posts: 3,652

Likes: 49

From: Bridgewater nj

Quote:

Originally Posted by tabbruzz

Try to adjust the accerator pump to see if you can get rid of it...

and that is the easiest to start with

Just tighten up the bolt w/ the spring just enough to slip a match book cover between the accelerator pump arm and bolt. Then punch that bitch to the floor