low acceleration shudder with new Greddy FMIC
09-10-03, 11:34 PM
#1
low acceleration shudder with new Greddy FMIC
Hey everyone
I Just had my new Greddy front mount intercooler installed about a month ago and since i have had it installed i have this shudder when i
it only happens with these parameters
around 3000rpm to 4200rpm
10 Hg Vacuum to 3 Pounds boost
in all gears
15% to 40% throttle
I am sure it is not the trivial grounding issue since ihave already applied the steps to the car.
I almost feels like the air flow meter is having an issue calculating the flow through all the long piping
What else could i check
Check Sig for all mods
I Just had my new Greddy front mount intercooler installed about a month ago and since i have had it installed i have this shudder when i
it only happens with these parameters
around 3000rpm to 4200rpm
10 Hg Vacuum to 3 Pounds boost
in all gears
15% to 40% throttle
I am sure it is not the trivial grounding issue since ihave already applied the steps to the car.
I almost feels like the air flow meter is having an issue calculating the flow through all the long piping
What else could i check
Check Sig for all mods
09-19-03, 01:33 AM
#5
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Sorry for the late reply. The reason I asked about the AFM is the S4 has to be lever for it to work properly but
S5 AFM doesn't apply.
I was thinking about the secondaries but doesn't sound like it. A long piping will just give a slight lag but not a stutter. I had a hell of a time tracing my problem when I did mine (S4) and it came down to AFM that must be mounted before the turbo. S5 can be mounted anywhere. Is there error code? Did you try adjusting the TPS?
S5 AFM doesn't apply.
I was thinking about the secondaries but doesn't sound like it. A long piping will just give a slight lag but not a stutter. I had a hell of a time tracing my problem when I did mine (S4) and it came down to AFM that must be mounted before the turbo. S5 can be mounted anywhere. Is there error code? Did you try adjusting the TPS?
09-21-03, 06:22 AM
#6
Lives on the Forum
boosted1205 has a point...
Where is the AFM mounted in ralation to the turbo/TB?
If you stuffed it in the same place as stock (i.e. before the turbo), the differential in response at the engine could be significant enough to cause headaches.  Due to the extra piping, try mount the AFM as close to the TB as possible - this might require you extending the AFM harness to reach that far.  Most FMIC guys run the AFM's *after* the IC.
-Ted
Where is the AFM mounted in ralation to the turbo/TB?
If you stuffed it in the same place as stock (i.e. before the turbo), the differential in response at the engine could be significant enough to cause headaches.  Due to the extra piping, try mount the AFM as close to the TB as possible - this might require you extending the AFM harness to reach that far.  Most FMIC guys run the AFM's *after* the IC.
-Ted
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