Better Throttle Response

[dirt_track_racer_81]

OK the vehicle is a 2000 chevy truck with the 5.3, has the Tr224 112 lsa cam..Has 2001 custom operation system, also tuned speed density with out a maf.when i go to rev off idle its kinda sluggish is there any way I can get a snappy throttle response through the tunning?? anything in the throttle cracker or follower would help this?or is the intake holding this back?

[Tordne]

OK the vehicle is a 2000 chevy truck with the 5.3, has the Tr224 112 lsa cam..Has 2001 custom operation system, also tuned speed density with out a maf.when i go to rev off idle its kinda sluggish is there any way I can get a snappy throttle response through the tunning?? anything in the throttle cracker or follower would help this?or is the intake holding this back?

You could have a look at the Throttle Follower settings. But there really could be any number of things, both mechanical and tune wise that can affect this.

Throttle Follower adds and amount of air depending on the TP% applied.

I would also check the PE settings, assuming you are burying your foot :). I have seen on some truck tunes that the PE delay (B3608) set to 60 seconds :eek:

[dirt_track_racer_81]

im not using any one the pe tables

[Tordne]

So you are using the B3647 table in the custom OS for enrichment then?

[dirt_track_racer_81]

dont remember the number but its the map vs rpm table

[Black02SS]

It would be a lot easier to help you if you can give us more information. The table number he referenced to you need to physically open the program and check. I am not trying to sound rude, but it is hard for us to "guess" at what things are.

[dirt_track_racer_81]

yes its the b3647 commanded fuel vs rpm excuse me..

[ringram]

Yeah lots of things for throttle response. I had to reduce my follower settings recently because after sorting out timing, porting the TB and cold air intake it was too much.
So as Tordne says a lot of things can help throttle response.

Throttle Body
Timing
Follower
Cold air intake
Exhaust
Cam
Heads etc

If it was me Id look at base spark and high octane table in the off idle positions, Id also port my TB, that made a big difference for me. Then all the usual bolts on mods.

[johnsZ06]

Add a few degrees of timing from 600 up to 2000 until it revs easily. Worked for me!

[dirt_track_racer_81]

in the b5932 and b5933 are at 25 degrees from 0 to 2000 rpm should that be higher. i do have a cold air and ported throttle body..

[ringram]

Depends on your setup. Save the tune, add a few degrees to the tables in the idle and off idle cells. Dont forget high octane table too and see how you go. You can always go back if its no good. Just remember to log and keep an eye and ear out for knock.
You can scale b4315 up by maybe 25-75% for a quick fix. Just remember to save your current/old tune so you can go back. Do one change at a time and check.

[Tordne]

ringram beat me :)

You want to check in your High/Low octane tables really. The base tables are only used when at idle, or you have basically 0 tp%.

[dirt_track_racer_81]

right now on my high/low octane tables..i copied the high octane table to the low octane table and subracted 5 degrees over the whole table..is that ok? that was another thing i was wondering..
what tables is the b4315, im at home not at work so i cant look at efi live right now i was just wondering what this table was..but i will be in to that table tomorrow at work..

[Tordne]

B4315 is the Throttle Follower airflow table.

I would imagine that subtracting 5* timing will make it seem a lot more sluggish. You will probably need to add timing, but at the same time check that it doesn't advance too much to bring on Knock Retard (KR).

[johnsZ06]

This is my base spark. Use it as an example.

[hpcubed]

Check the burst knock tables as well.

[Tordne]

Better still 0 those damn Burst Knock tables out ;)