Replacing a 2.3 short block with a 2.0--tuning question - The Saab Link Forums

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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 10-09-2012, 07:07 AM   #1
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Replacing a 2.3 short block with a 2.0--tuning question

Hi all,

So my '01 Viggen's short block is toast. My mechanic tells me he has put in a couple of 2.0's in Viggens no problem. It is my understanding this is in fact the case, that the .3 displacement is negligible. Obviously Turbo and some other things will have to be also reinstalled. From what I have read, there are no real issues to deal with. My question has to do with tuning. The car has a custom ECU tune from the previous owner. Will the swap reset things or do I need to have some retune it for me? I am not interested in boosting performance, more like optimizing it.

Thanks and apologies for my ignorance on things. Thought I would run it by this forum before speaking with my mechanic.
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Old 10-09-2012, 07:09 AM   #2
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retune is needed
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Old 10-09-2012, 07:28 AM   #3
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My Viggen convertible ran perfectly with a 2.0 engine on the stock 2.3 ECU. The ECU can adapt up to a 25% difference in air flowing through the AMM, the 0.3 liter difference in displacement is only 15% difference (assuming 100% VE, which it isn't).

See this link:

https://www.saablink.net/forum/genera...tion/47828.htm
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Old 10-09-2012, 08:02 AM   #4
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Ok, then. Will disconnecting negative terminal do the trick of getting rid of the JSW custom tune in the ECU? I believe that it is written in the NVRAM, so resetting the ECU would not affect things. Given that the tuning was done for a 2.3, not a 2.0, there may be problems. Perhaps I need to write to JZ Williams who did the tune.
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Old 10-09-2012, 09:04 AM   #5
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It will run, but the timing maps are waaay different and the fueling is different, the stroked motor makes a lot more torque about 50 ft-lbs across the board and it spools the turbo up a good 500rpm earlier, so there is quite a bit of difference in the two when driving.

It should be re-tuned for it to run up to its potential...

Its the same as driving a 2.0 hot model and a viggen, the extra torque is great for city driving and low end torque, I actually convert all my 2.0 motors to 2.3 for this reason. It also helps a larger turbo spool up faster.

Flat out racing high rpm, the 2.0 is the better balanced motor. Street/strip car, the 2.3 stroked motor is much better in my opinion. Nothing like a ng900 with a 2.3 motor, GOBS of Torque !

John
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Old 10-26-2012, 06:46 AM   #6
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RE: Update on 2.0 short block

So I have been driving it without a retuned ECU and here is what I can say: acceleration not quite as powerful. With the JCW tune, it really gave a nice boost when pushing things. As soon as I have a couple of days when I don't need the car, I will ship it off and get it retuned.

The one issue is this: the engine 'burps' when I take the foot off the gas at high speeds and then downshift, the exhaust will emit a significant belch of smoke.

In general, I would say it is emitting more smoke then before, especially when downshifting. any ideas on what might be causing this? Other than that, it is running fine.

Thanks!

Chris
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Old 10-26-2012, 09:11 AM   #7
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tooooooooooo much fuel

get ready to replace your cat converter

why didnt you just install a 2.3 out of a Saab 9000 ('94-'98 )
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Old 11-02-2012, 09:57 AM   #8
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jeese i wish i had the extra .3 i dont understand why you would want to go down, no offense
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Old 12-22-2012, 01:55 PM   #9
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Update #2. In fact the exhaust issue was the result of a dying turbo. Just replaced it and its good to go. Have had no real issues without a retune of the ecu.



But of course now that its going good I am going back overseas! I am going to sell it as I can only garage one car and the wife is insisting on the family car.
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