Richening up the car like an old carb. car?
12-02-2002, 02:13 PM
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Richening up the car like an old carb. car? OK, the subject probably doesn't make much sense.
I am trying to figure out a correlation between carb jet changes and using LS1edit to richen up the PE vs. RPM table. More specifically, I want to know approximately how much to modify the table to make a change comparable to changing to 2-3 sizes bigger jets on a carb car...
I'm thinking 5-7% would be about right, but I'm not sure. Any ideas?????
I am trying to figure out a correlation between carb jet changes and using LS1edit to richen up the PE vs. RPM table. More specifically, I want to know approximately how much to modify the table to make a change comparable to changing to 2-3 sizes bigger jets on a carb car...
I'm thinking 5-7% would be about right, but I'm not sure. Any ideas?????
12-02-2002, 04:19 PM
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Re: Richening up the car like an old carb. car? The comparison doesn't apply very well. If we knew all the parameters, we could just plug them in. Carbs have different flow characteristicts than TBs/FI.
Carbs are (almost, for this discussion) infinitely variable to a point: but by the same token, so is FI: provided you have the means to modify the fuel intake vs the air vs timing.
The gains you get from a tuneable pcm, whereby you can constantly adjust the F/A ratio, is of greater advantage to a thinking hot-rodder.
I'm sorry, I just like to pick on my fellow Floridians. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Thimk!
<small>[ December 02, 2002, 04:21 PM: Message edited by: gwj ]</small>
Carbs are (almost, for this discussion) infinitely variable to a point: but by the same token, so is FI: provided you have the means to modify the fuel intake vs the air vs timing.
The gains you get from a tuneable pcm, whereby you can constantly adjust the F/A ratio, is of greater advantage to a thinking hot-rodder.
I'm sorry, I just like to pick on my fellow Floridians. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Thimk!
<small>[ December 02, 2002, 04:21 PM: Message edited by: gwj ]</small>
12-02-2002, 05:06 PM
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Re: Richening up the car like an old carb. car? OK, that makes sense... I'm just trying to carefully sneak up on the tune a little bit, and don't want to change too much at one time...
Thanks!
Thanks!
12-02-2002, 11:38 PM
#5
Re: Richening up the car like an old carb. car? Shooting on from the hip on this one:
I take care of the EFI cars, not the carbarated ones.
2-3% on the PE table equals about 1 a/f point. Some motors are sluggish with the PE table, and require 4-5% (usually the larger ci)
The short-track folks we get in I believe pull 2 jet sizes to move the a/f 1 point.
Good Luck,
Kevin
I take care of the EFI cars, not the carbarated ones.
2-3% on the PE table equals about 1 a/f point. Some motors are sluggish with the PE table, and require 4-5% (usually the larger ci)
The short-track folks we get in I believe pull 2 jet sizes to move the a/f 1 point.
Good Luck,
Kevin
