GM Engine & Exhaust Performance EFI | GEN I/GEN II/GEN III/GEN IV Engines |Small Block | Big Block |

new hot parts from cmotorsports plus new charge pipes too

Thread Tools
 
Search this Thread
 
Old Mar 20, 2005 | 12:40 PM
  #21  
Green Thunder's Avatar
TECH Fanatic
iTrader: (11)
 
Joined: Apr 2004
Posts: 1,532
Likes: 0
Default

Good looking parts Jim... Any better pics of the intercooler in its new location?
Reply
Old Mar 20, 2005 | 04:06 PM
  #22  
TurboBerserker's Avatar
I AM A MOTHERF*CKER
iTrader: (1)
 
Joined: Aug 2004
Posts: 7,132
Likes: 1
Default

Originally Posted by parish8
i didn't yet but i am hoping it can just be done with programing. i was hoping you had it figured out by now , what exactly do you get? does it very the timing based on map now and then just get stupid when the map max's? worst case i put the maf back in but i am going to try and avoid that. not having it there has to be worth a couple of hp i would think.
Here's the trouble: the pcm picks the amount of advance based on the g/sec air measured by the MAF. Without the MAF in the loop, it does a calculation based on the VE table in the stock PCM. So, unless you are going to build an accurate VE table for the 408 in the stock PCM, you will always see the advance from the very top line (lowest g/sec air) -- in other words the deceleration, burn up all that extra fuel line.

The MAP doesn't play into this part at all from what I can tell.

I've been trying to come up with a way of building a VE table in my PCM based on the VE in the MS, but no luck as of yet. I was thinking of using the max boost line as the max map line in the PCM and then guesstimating the rest based on the MS table equivalent cells.

For now, the MAF is just easier
Reply
Old Mar 20, 2005 | 04:11 PM
  #23  
parish8's Avatar
Thread Starter
single digit dreamer
iTrader: (6)
 
Joined: Mar 2002
Posts: 9,743
Likes: 2
From: omaha ne
Default

Originally Posted by TurboBerserker
Here's the trouble: the pcm picks the amount of advance based on the g/sec air measured by the MAF. Without the MAF in the loop, it does a calculation based on the VE table in the stock PCM. So, unless you are going to build an accurate VE table for the 408 in the stock PCM, you will always see the advance from the very top line (lowest g/sec air) -- in other words the deceleration, burn up all that extra fuel line.

The MAP doesn't play into this part at all from what I can tell.

I've been trying to come up with a way of building a VE table in my PCM based on the VE in the MS, but no luck as of yet. I was thinking of using the max boost line as the max map line in the PCM and then guesstimating the rest based on the MS table equivalent cells.

For now, the MAF is just easier
with no maf it has to look at the map to even guess what cell to look at for the ve table.
Reply
Old Mar 20, 2005 | 06:13 PM
  #24  
TurboBerserker's Avatar
I AM A MOTHERF*CKER
iTrader: (1)
 
Joined: Aug 2004
Posts: 7,132
Likes: 1
Default

True, but I don't think the MAP value is used in the calculation once the cell is known. I really don't see a good way around this one, except faking the PCM ve table.
Reply
Old Mar 20, 2005 | 06:20 PM
  #25  
parish8's Avatar
Thread Starter
single digit dreamer
iTrader: (6)
 
Joined: Mar 2002
Posts: 9,743
Likes: 2
From: omaha ne
Default

i really wont know till i try it, there are other guys running without the maf so i think it can be done. i will be carefull as i roll into the pedal to see where the timing goes.
Reply
Old Mar 20, 2005 | 07:58 PM
  #26  
parish8's Avatar
Thread Starter
single digit dreamer
iTrader: (6)
 
Joined: Mar 2002
Posts: 9,743
Likes: 2
From: omaha ne
Default

Originally Posted by Flipper
Good looking parts Jim... Any better pics of the intercooler in its new location?
http://www.neufamily.org/images/intercooler/

there is a lot more room down there. probably room for an intercooler twice that thick.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
chopperloco
Trucks and SUV Classifieds
15
Jul 10, 2016 10:45 PM
Goat's ss
GMT 800 & Older GM General Discussion
5
Jan 3, 2016 06:28 PM
05GMC4.8
GMT 900 Trucks General Discussion
5
Aug 7, 2015 09:55 PM
blownss27
GM Parts Classifieds
10
Jul 20, 2015 08:59 AM
FlowmasterMufflers
GM Engine & Exhaust Performance
0
Jul 17, 2015 03:26 PM




All times are GMT -5. The time now is 07:15 AM.