VE Tables Fuel Tables Maps Igniton Spark

John Hess johnhess at cris.com
Sun Feb 8 05:04:19 GMT 1998


The VE discussions are great;  but, can anyone tell me where they are in an
'89 Corvette map?

At 10:38 AM 2/7/98 PST, you wrote:
>Well now that we're dun tuning we can all find a Mexican
>restuarant and contribute to the methane problem, right.
>Well ya if ya want, but there are just a few closing notes
>I got..
>  I have not read anything that says you can't run vaccum
>referenced fuel pressure regulators with TBIs, the pressure
>variance is usually too much, but if you run a second 
>fuel pressure regulator, you can trim this variance.  This
>is the only way out of not being tune the acclerator pump
>features of TBI, since no commercial program I've heard of
>allows ya to do this, however once you have things rather
>close you can try other chips from other applications,
>and put your tables on them.  If ya remember from the
>good old days, a big block always took more acclerator
>pump than a small block (hint). 
>  The you can try adding timing to the spark table, and
>remove a similiar amount from the WOT spark addition.
>  The same with the fuel table, and WOT enrichment.
>  When you start getting close, change only one thing
>at a time, one thing only,  Move two and things might
>seem fine but then 2 moves later everything takes a 
>dodo.  
>  One of the easiest errors is make is use too much
>air filter, actually the problem is getting the air to
>organize to flow thru the throttle body,  Having
>several hundred square inches of filtering surface area
>if fine,  but having a huge volume of air sitting on
>top of the butterflies, can have it's down sides.  IE
>when the throttles snap open, it takes/can take a
>huge acclerator pump shoot to cover the delay in
>this column of air to get moving.  If your using an
>open element filter than I suggest doing this.
>  Assemble the air cleaner housing, and element
>as it would sit in the air horn.  Measure the distance
>from the sealing ring portion to the lid,  any thing
>more than an inch is too much in my book, and from
>my testing, I have several cases to prove this.
>Go to the hobby shop (say you had 3 1/4" dimension)
>Lets also say the air filter sealing ring was 5" in diam.
>You'll need enough thin brass to make two rings
>Which 3" wide, and about 16" long.  To make a tube
>5" in diam, and 2 1/2" tall.  The reason I say two is
>you have to experiment, on the height, and that means
>going too far, and that will ruin the first one.  I have't
>found getting more than 1/4" close as necessary.
>  HTH   Bruce    Anyone have any tuning questions
>                          e-mail me, and I'll see if I got any notes
>                          to write about.
>                          DO NOT use staples for cone shaped 
>                          hat retension, unless helping someone
>                          else with their hat
>
>



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