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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech

what is dashpot?

  • Thread starter Thread starter tealstang67
  • Start date Start date Aug 4, 2009

tealstang67

Member
May 19, 2009
47
0
6
Aug 4, 2009
#1
  • Aug 4, 2009
  • #1
Is there anywhere i can read up on dashpot settings? I do not understand where to start. I do believe this is where my idle issues are coming from. My idle is all jacked up and i think the dashpot drops off to quickly there for causes it to stall and die.
 

pirotec354

Member
Aug 28, 2008
127
0
16
Grand Rapids, Michigan
Aug 4, 2009
#2
  • Aug 4, 2009
  • #2
Dashpot is the decay rate of the rpms coming down and finding idle from what i understand. Its usually shown as bypass airflow from the iac at closed throttle vs engine speed. You want to contour this so it will drop quickly at higher rpm's once the throttle is closed and slows as it approaches idle. If it is to fast is will drop right past idle and stall/die. It may just take some trial and error to get it perfect.

I see you also have a supercharger, this will also cause problems since there is excess pressure in front of the throttle plate. You want to keep the dashpot values low since your iac is fed from a pressurize source.

You can also go over too eectuning.org and read up on it there. Im sure theres some good info over there. i think Ive seen you over there? Not sure if im remembering correctley though. Hope this helps.

Also you want to take into account for larger throttle bodies and such.

-Justin
 

tealstang67

Member
May 19, 2009
47
0
6
Aug 4, 2009
#3
  • Aug 4, 2009
  • #3
That helps a little, As far as pressure in front of the TB a KB is a draw through setup there for it only has vacuum in front of the TB. The dashpot settings and TB air flow is where i need to start i think.
 

pirotec354

Member
Aug 28, 2008
127
0
16
Grand Rapids, Michigan
Aug 5, 2009
#4
  • Aug 5, 2009
  • #4
Its still going to affect the iac b/c more air is being fed through it.
 

64post

Member
Apr 27, 2010
45
0
6
Sonoma Calif.
Jun 28, 2010
#5
  • Jun 28, 2010
  • #5
What is the normal decay rate? I ask because my idle hangs up too long IMO before returning to 700 rpm, up to 15 seconds sometimes but usually 5-7 secs. It messes up around town drivability. This is a Moates chip for a T4M0.
 

Stangstroke

Member
Mar 25, 2011
118
0
16
Barrie Onatrio Canada
Apr 11, 2011
#6
  • Apr 11, 2011
  • #6
tealstang67 said:
Is there anywhere i can read up on dashpot settings? I do not understand where to start. I do believe this is where my idle issues are coming from. My idle is all jacked up and i think the dashpot drops off to quickly there for causes it to stall and die.
Click to expand...

hey how you doing? Good to read someone else has almost the same set up as i do. I had horrible drivability issues when my car was complete before the car got tuned and all of problems disappeared with the proper tune, my suggestion is to go to someone in your area that knows how to set your car up and the 94 to 95 are about the hardest ones to tune because of the computer it used for those two years. If your in California i can make a suggestion for who to use?
 
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