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Old 07-11-2013, 03:15 PM   #1
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Viggen engine swap ??

I was just curious about the Viggen convertible engine, did SAAB limit the amount of torque and boost in 1st and 2nd gear giving if full torque and boost by 3rd gear?? If so did SAAB accomplish this with reprograming the computers or is it a entirely different engine as what is in the 3-door and 5-door??

This is why I ask, I own a 2001 3-door and at 72k I had to replace the engine, I had this done at the SAAB dealership, they found another used Viggen engine with 95k on it, they said it was super clean....now if that engine was from a convertible viggen(they never told me otherwise)would I have the limited torque and boost in the 1st and 2nd gear as a convertible viggen would, or would this have had to be done with reprogramming of the computers and such......so i guess my actual ? is, with this engine swap my 3-door Viggen still should have full boost and torque thru out all 5 gears?

I know this is a strange ?, but any thoughts would be greatly appreciated
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Old 07-11-2013, 03:33 PM   #2
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I believe they all had boost limited in 1st and 2nd, it's in the ECU programming.

Convertible and hard top Viggen engines and ECU's are all identical (and Viggen engine and ECU are identical to early 9-5 Aero.)
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Old 07-11-2013, 03:59 PM   #3
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yes boost was limited in 1st and 2nd gear....slightly more in convertibles to reduce chassis flex
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Old 07-11-2013, 04:07 PM   #4
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I believe they all had boost limited in 1st and 2nd, it's in the ECU programming.

Convertible and hard top Viggen engines and ECU's are all identical (and Viggen engine and ECU are identical to early 9-5 Aero.)
I just remembered reading somewhere that they limited the boost in the convertible only.....how do I know for sure if I dont have the limited boost in 1st and 2nd considering I have the hard top? Its just been kinda frustrating to me because just recently Ive been getting low boost, so i plugged the R hose on the BPC valve and the boost was better, then I plugged the W hose and WOW it boost into the red and hit the fuel cut off, so I cleaned the BPC with some brake cleaner and put everything back as is, all hoses connected and now it still kinda boost low in 2nd but by 3rd it will touch the red, so im just not sure what to check next thanks for the help!
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Old 07-11-2013, 04:09 PM   #5
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yes boost was limited in 1st and 2nd gear....slightly more in convertibles to reduce chassis flex
ok, I kinda figured it was because of the chasis flex, is their a way to get full boost in my 1st and 2nd?? do I need 2 start moding it out?
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Old 07-11-2013, 04:44 PM   #6
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I believe they all had boost limited in 1st and 2nd, it's in the ECU programming.

Convertible and hard top Viggen engines and ECU's are all identical (and Viggen engine and ECU are identical to early 9-5 Aero.)
how is this done? Does the ECU look at MPH and RPM inputs and determine "yep...you are in 1st, you are in 2nd....." ???
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Old 07-11-2013, 05:42 PM   #7
 
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ok, I kinda figured it was because of the chasis flex, is their a way to get full boost in my 1st and 2nd?? do I need 2 start moding it out?
You don't want this.

At all. Seriously.

Here's are two reasons: You barely have any stability now when you're on boost because of the car's inherently flawed suspension geometry. Add a comically flexy chassis and that's a recipe for putting the nose into a ditch.

Reason 2: These cars produce a serious amount of torque and put it through a drivetrain designed to last 200,000 miles without any major service. Adding torque when the car is moving slowly puts more stress on drivetrain components than when the car is moving faster.
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Old 07-11-2013, 05:45 PM   #8
 
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how is this done? Does the ECU look at MPH and RPM inputs and determine "yep...you are in 1st, you are in 2nd....." ???
IIRC, that's pretty much how it works. It gets inputs of RPM from the crank and MPH from the speed sensors on the hub.

There's a graph of the boost/RPM maps somewhere on the T7 Suite site....
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Old 07-11-2013, 09:22 PM   #9
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IIRC, that's pretty much how it works. It gets inputs of RPM from the crank and MPH from the speed sensors on the hub.

There's a graph of the boost/RPM maps somewhere on the T7 Suite site....


Yup.

In the 9-3SS the calculated gear is also part of how the stability control system works. Cool stuff.
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