A4 tranny bounces off rev limiter before shift after programming?
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From: Ft. Wayne, IN
A4 tranny bounces off rev limiter before shift after programming?
I just had Bryan at PCMforless reprogram my computer for the XE 224/230. Car runs great, but the tranny hits the revlimiter pretty much everytime on the 2-3 shift (WOT) and occasionally on the 1-2 shift (WOT). Did he program the tranny to shift to close the revlimiter or does this mean the tranny is going? The tranny shifts fine under normal acceleration by the way. Would programming the tranny to shift earlier aleviate this problem?
Jeff
Jeff
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Joined: May 2003
Posts: 1,132
From: Atlanta Ga
It can all be adjusted.
It's in the ECM Constants table and you have two different limits. There is a "Fuel Cutoff, 1st Gear" and a "Fuel Cutoff, 2nd - 6th gear"
Just raise those values to whatever you want the limit to be.
It's in the ECM Constants table and you have two different limits. There is a "Fuel Cutoff, 1st Gear" and a "Fuel Cutoff, 2nd - 6th gear"
Just raise those values to whatever you want the limit to be.
Last edited by bruecksteve; Jun 23, 2003 at 09:04 AM.
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Joined: May 2003
Posts: 1,132
From: Atlanta Ga
Maybe I misread.
Yes, you can program the tranmission to shift earlier. I was told it's the "Kickdown Mode Up/Down Shift Points" and they are set by MPH, not RPM. They just need to be set to a lower MPH.
Yes, you can program the tranmission to shift earlier. I was told it's the "Kickdown Mode Up/Down Shift Points" and they are set by MPH, not RPM. They just need to be set to a lower MPH.
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Joined: Aug 2001
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From: Michigan's left coast
You need to either raise the limiter, or lower the WOT shift points.
There's two parameters for the WOT point - RPM and MPH, and you need to meet both before the trans even starts to upshift. Typically, I've found that it's best to set the RPM shift point way low, and then use the MPH value to creep up on the desired shift point. If you want the 1-2 to occur at, say, 45 MPH, then start with a value more like 35 MPH and move up in 1-2 MPH increments.
There's two parameters for the WOT point - RPM and MPH, and you need to meet both before the trans even starts to upshift. Typically, I've found that it's best to set the RPM shift point way low, and then use the MPH value to creep up on the desired shift point. If you want the 1-2 to occur at, say, 45 MPH, then start with a value more like 35 MPH and move up in 1-2 MPH increments.
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Joined: Apr 1999
Posts: 191
From: Central KY
Originally posted by Eric Bryant
You need to either raise the limiter, or lower the WOT shift points.
There's two parameters for the WOT point - RPM and MPH, and you need to meet both before the trans even starts to upshift. Typically, I've found that it's best to set the RPM shift point way low, and then use the MPH value to creep up on the desired shift point. If you want the 1-2 to occur at, say, 45 MPH, then start with a value more like 35 MPH and move up in 1-2 MPH increments.
You need to either raise the limiter, or lower the WOT shift points.
There's two parameters for the WOT point - RPM and MPH, and you need to meet both before the trans even starts to upshift. Typically, I've found that it's best to set the RPM shift point way low, and then use the MPH value to creep up on the desired shift point. If you want the 1-2 to occur at, say, 45 MPH, then start with a value more like 35 MPH and move up in 1-2 MPH increments.
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