MSPNP MSPNP specific Megasquirt related discussion.

Quick question on VE table resolution

Thread Tools
 
Search this Thread
 
Old 01-15-2019, 05:57 PM
  #1  
Junior Member
Thread Starter
iTrader: (-1)
 
wherestheboost's Avatar
 
Join Date: Apr 2008
Location: Southern California
Posts: 421
Total Cats: 16
Default Quick question on VE table resolution

Running NA (no boost) with my cleaned NB2 injectors that allegedly run at 282 at 43.5psi thus running at ~330 at 60psi. I used the REQ calculator and pegged it at 300 so to make the change not too drastic. Therefor, REQ = 10.1.

The highest value on my table is ~100 at 100kPa and 6500rpm. I've heard that you could get more resolution by fiddling with the REQ values. I just wanted to make sure I had this right...

Target max value as 250. 250/100 = 2.5.

10.1/2.5 = 4.04.

Change REQ to 4.04, and multiply entire VE table by 2.5? "Profit" from higher resolution for finer tuning? I'm not "there" yet with my tune at its current state, but wanted to make sure I had this idea correct.

Cheers!
wherestheboost is offline  
Old 01-15-2019, 06:06 PM
  #2  
Elite Member
iTrader: (6)
 
ryansmoneypit's Avatar
 
Join Date: Feb 2013
Location: A cave in Va
Posts: 3,395
Total Cats: 456
Default

but do you have 60 psi or 43?


you left out some details.
ryansmoneypit is offline  
Old 01-15-2019, 06:08 PM
  #3  
Elite Member
iTrader: (6)
 
ryansmoneypit's Avatar
 
Join Date: Feb 2013
Location: A cave in Va
Posts: 3,395
Total Cats: 456
Default

ps ive never seen a negative trade score.
ryansmoneypit is offline  
Old 01-15-2019, 06:12 PM
  #4  
Junior Member
Thread Starter
iTrader: (-1)
 
wherestheboost's Avatar
 
Join Date: Apr 2008
Location: Southern California
Posts: 421
Total Cats: 16
Default

Car's an NB1 with nothing changed (aside from NB2 injectors) so allegedly 60psi.

And as far as the score...yeah it's from my younger years. Buyer got mad since I backed out after saying "deal" - since I sold locally and refunded him his money. Haven't bought or sold since
wherestheboost is offline  
Old 01-15-2019, 07:14 PM
  #5  
Elite Member
iTrader: (6)
 
ryansmoneypit's Avatar
 
Join Date: Feb 2013
Location: A cave in Va
Posts: 3,395
Total Cats: 456
Default

Understood, on all fronts.

to answer your question, I dont think that adds any resolution. Thats just changing a multiplayer IMO. Adding more places in X and Y axis would add resolution.

interested to hear from others.
ryansmoneypit is offline  
Old 01-15-2019, 07:39 PM
  #6  
Retired Mech Design Engr
iTrader: (3)
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 5,009
Total Cats: 857
Default

Resolution was a thing with MS1, which, I understand had only whole numbers. like "127". Newer MS have decimal... like "127.3", which has already increased resolution by 10 fold. If you have MS2 or 3, or perhaps the High - Res upgrade to MS1, there is not value in increasing the resolution by 2.5.
DNMakinson is offline  
Old 01-15-2019, 09:12 PM
  #7  
Junior Member
Thread Starter
iTrader: (-1)
 
wherestheboost's Avatar
 
Join Date: Apr 2008
Location: Southern California
Posts: 421
Total Cats: 16
Default

Oh... then that settles that. Is there a way for tables to show the decimals? I know the afrs do... but not sure with VE. It seems to round up.
wherestheboost is offline  
Old 01-15-2019, 09:24 PM
  #8  
Elite Member
iTrader: (6)
 
ryansmoneypit's Avatar
 
Join Date: Feb 2013
Location: A cave in Va
Posts: 3,395
Total Cats: 456
Default

It should take any number you input.
ryansmoneypit is offline  
Old 01-15-2019, 09:30 PM
  #9  
Tweaking Enginerd
iTrader: (2)
 
Ted75zcar's Avatar
 
Join Date: Mar 2013
Location: Boulder, CO
Posts: 1,778
Total Cats: 359
Default

IIRC you don't get decimals until MS3

Ted75zcar is offline  
Old 01-15-2019, 09:36 PM
  #10  
Retired Mech Design Engr
iTrader: (3)
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 5,009
Total Cats: 857
Default

Looks like I spoke out of ignorance. Perhaps only MS3 has 4 places (3 + decimal).

In that case, yes. Divide ReqFuel by 2.5 and multiply table by 2.5. Fueling equation comes out the same.

My apologies.

EDIT: Yes, I looked up the MS2 Manual.
DNMakinson is offline  
Old 01-15-2019, 11:21 PM
  #11  
Junior Member
Thread Starter
iTrader: (-1)
 
wherestheboost's Avatar
 
Join Date: Apr 2008
Location: Southern California
Posts: 421
Total Cats: 16
Default

Awesome thankyou. And then if when I go turbo... undo it all for the same reason.
wherestheboost is offline  
Old 01-15-2019, 11:26 PM
  #12  
Tweaking Enginerd
iTrader: (2)
 
Ted75zcar's Avatar
 
Join Date: Mar 2013
Location: Boulder, CO
Posts: 1,778
Total Cats: 359
Default

Dont do it in the first place

an accurate VE table is the key to a good tune. The 1 bit increase in resolution won't really do much for you.
Ted75zcar is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
az-ben
MEGAsquirt
1
02-05-2017 05:09 PM
Padlock
ECUs and Tuning
8
01-03-2015 02:57 PM
akaryrye
MEGAsquirt
13
02-03-2009 12:51 PM
Saml01
MEGAsquirt
11
12-31-2007 12:26 AM



Quick Reply: Quick question on VE table resolution



All times are GMT -4. The time now is 07:29 PM.